MAX1530ETJ+T-MAX1531ETJ+-MAX1531ETJ+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1531ETJ+T ,Multiple-Output Power-Supply Controllers for LCD MonitorsElectrical Characteristics(Circuit of Figure 1, V = 12V, V = V = 5V, T = 0°C to +85°C, unless other ..
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MAX1530ETJ+T-MAX1531ETJ+-MAX1531ETJ+T
Multiple-Output Power-Supply Controllers for LCD Monitors
General Description
The MAX1530/MAX1531 multiple-output power-supply
controllers generate all the supply rails for thin-film tran
sistor (TFT) liquid-crystal display (LCD) monitors. Both
devices include a high-efficiency, fixed-frequency, step-
down regulator. The low-cost, all N-channel, synchronous
topology enables operation with efficiency as high as 93%.
High-frequency operation allows the use of small induc-
tors and capacitors, resulting in a compact solution. The
MAX1530 includes three linear regulator controllers and
the MAX1531 includes five linear regulator controllers for
supplying logic and LCD bias voltages. A programmable
startup sequence enables easy control of the regulators.
The MAX1530/MAX1531 include soft-start functions to
limit inrush current during startup. An internal stepdown
converter current-limit function and a versatile overcurrent
shutdown protect the power supplies against fault condi-
tions. The MAX1530/MAX1531 use a currentmode control
architecture, providing fast load transient response and
easy compensation. An internal linear regulator provides
MOSFET gate drive and can be used to power small
external loads.
The MAX1530/MAX1531 can operate from inputs as
high as 28V and are well suited for LCD monitor and TV
applications running directly from AC/DC wall adapters.
Both devices are available in a small (5mm x 5mm), ultra-
thin (0.8mm), 32-pin QFN package and operate over the
-40°C to +85°C temperature range.
Applications●LCD Monitors and TVs
Features●4.5V to 28V Input Voltage Range●250kHz/500kHz Current-Mode Step-Down Converter Small Inductor/Capacitors No Sense Resistor●Three Positive Linear Regulator Controllers One Positive and One Negative Additional Controller (MAX1531) Small Input and Output Capacitors●Timed Reset Output●Uncommitted Overcurrent Protection (MAX1531)●Soft-Start for All Regulators●Programmable Input Undervoltage Comparator●Programmable Startup Sequencing
Pin Configuration appears at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP = Exposed pad.
PARTTEMP RANGEPIN-PACKAGE
MAX1530ETJ+-40°C to +125°C32 TQFN-EP*
MAX1530ETJ+T-40°C to +125°C32 TQFN-EP*
MAX1531ETJ+-40°C to +125°C32 TQFN-EP*
MAX1531ETJ+T-40°C to +125°C32 TQFN-EP*
RESET
VGOFF
-9V
VIN
VIN = 12V
ONL2
ONL5
ONL4
ONL3
SEQ
RSTIN
VOUT
3.3V/1.5A
VIN
DRV3
FBL3
FBL1
DRV1
BST
PGND
COMP
FBL2
DRV2
FBL5
DRV5
DRV4
FBL4
CSH
CSL
FREQ
ILIM
AGND
MAX1530
VGON
25V
VLOGIC
25V/500mA
VOUT
VSOURCE
10V/500mA
VIN
VGAMMA
-9.7V
VIN
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Minimal Operating Circuit
Ordering Information
EVALUATION KIT AVAILABLE
IN, DRV1, DRV2, DRV3, DRV4, CSH,
CSL to AGND ....................................................-0.3V to +30V
DRV5 to VL .............................................................-28V to +0.3V
CSH to CSL ..............................................................-0.3V to +6V
VL to AGND..............................................................-0.3V to +6V
PGND to AGND...................................................................±0.3V
LX to BST..................................................................-6V to +0.3V
BST to AGND..........................................................-0.3V to +36V
DH to LX .....................................................-0.3V to (BST + 0.3V)
DL to PGND ..................................................-0.3V to (VL + 0.3V)
SEQ, ONL2, ONL3, ONL4, ONL5, COMP,
ILIM to AGND...........................................-0.3V to (VL + 0.3V)
RSTIN, RESET, EN, FB, FBL1, FBL2, FBL3, FBL4, FBL5,
FREQ to AGND....................................................-0.3V to +6V
VL Short Circuit to AGND ...........................................Momentary
Continuous Power Dissipation (TA = +70°C)
32-Pin Thin QFN (derate 21.3mW/°C above +70°C) ...1702mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
(Circuit of Figure 1, VIN = 12V, VEN = VSEQ = 5V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS
GENERAL
Operating Input Voltage Range(Note 1)4.528.0V
Quiescent Supply CurrentVFB = VFBL1 = VFBL2 = VFBL3 =
VFBL4 = 1.5V, VFBL5 = 0V1.73.0mA
IC Disable Supply CurrentEN = AGND200400µA
VL REGULATOR
VL Output Voltage5.5V < VIN < 28V, 0 < IVL < 30mA4.7555.25V
VL Undervoltage Lockout ThresholdVL rising, 3% hysteresis3.23.53.8V
CONTROL AND SEQUENCE
SEQ, FREQ Input Logic High Level2.0V
SEQ, FREQ Input Logic Low Level0.6V
SEQ, FREQ Input Leakage Current-1+1µA
ONL_ Input ThresholdONL_ rising, 25mV hysteresis1.2011.2381.275V
ONL_ Source CurrentSEQ = EN = VL, VONL _ = 0 to 1.24V1.82.02.2µA
ONL_ Input Leakage CurrentSEQ = EN = VL, ONL_ = VL-500+500nA
ONL_ Input Discharge Clamp ResistanceVSEQ = 0V80015003000Ω
EN Input ThresholdEN rising, 5% hysteresis1.2011.2381.275V
EN Input Leakage Current-50+50nA
FAULT DETECTION
FB, FBL1, FBL2, FBL3, FBL4
Undervoltage Fault Trip Level
FB, FBL1, FBL2, FBL3, FBL4 falling,
25mV hysteresis1.0811.1141.147V
FBL5 Undervoltage Fault Trip LevelFBL5 rising, 25mV hysteresis300400500mV
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(Circuit of Figure 1, VIN = 12V, VEN = VSEQ = 5V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS
Comparator BandwidthFor EN, FB, FBL_10kHz
Duration to Trigger Fault LatchFor FB, FBL_516477ms
Overcurrent Protection Threshold(VCSH - VCSL)270300330mV
Overcurrent Sense Common-Mode RangeVCSH, VCSL2.728.0V
CSH Input CurrentVCSH = 2.7V to 28V100µA
CSL Input CurrentVCSL = VCSH = 12V-50+50nA
Overcurrent Sense Filter RC Time
Constant50µs
THERMAL PROTECTION
Thermal ShutdownTemperature rising, 15°C hysteresis160°C
RESET FUNCTION
RSTIN Reset Trip LevelRSTIN falling, 25mV hysteresis1.0811.1141.147V
RSTIN Input Leakage CurrentVRSTIN = 1.5V-50+50nA
Comparator Bandwidth10kHz
Reset Timeout Period102128154ms
RESET Output Low LevelIRESET = -1mA0.4V
RESET Output High LeakageVRESET = 5V1µA
STEP-DOWN CONTROLLER
ERROR AMPLIFIER
FB Regulation Voltage1.2231.2381.253V
TransconductanceFB to COMP70100140µS
Voltage GainFB to COMP200V/V
Minimum Duty Cycle15%
FB Input Leakage CurrentVFB = 1.5V-50+50nA
FB Input Common-Mode Range(Note 2)-0.1+1.5V
COMP Output Minimum VoltageVFB = 1.5V1V
COMP Output Maximum VoltageVFB = 1.175V3V
Current-Sense Ampliier Voltage GainVIN - VLX2.753.54.0V/V
Current-Limit Threshold (Default Mode)PGND - LX, ILIM = VL190250310mV
Current-Limit Threshold (Adjustable Mode)PGND - LX, VILIM = 1.25V190250310mV
ILIM Input Dual Mode™ Threshold3.03.54.00V
OSCILLATOR
Switching FrequencyFREQ = AGND200250300kHzFREQ = VL425500575
Maximum Duty CycleFREQ = AGND758088%FREQ = VL758088
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Electrical Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, VEN = VSEQ = 5V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS
SOFT-START
Step SizeMeasured at FB1.238/32V
PeriodFREQ = GND1024/fOSCsFREQ = VL2048/fOSC
FET DRIVERS
DH, DL On-Resistance310Ω
DH, DL Output Drive CurrentSourcing or sinking, VDH or VDL = VVL / 20.5A
LX, BST Leakage CurrentVBST = VLX = VIN = 28V20µA
LINEAR REGULATOR CONTROLLERS
POSITIVE LINEAR REGULATOR (LR1)
FBL1 Regulation VoltageVDRV1 = 5V, IDRV1 = 100µA1.2261.2451.264V
FBL1 Input Bias CurrentVFBL1 = 1.5V-50+50nA
FBL1 Effective Load Regulation
Error (Transconductance)VDRV1 = 5V, IDRV1 = 100µA to 2mA-15-2%
FBL1 Line Regulation ErrorIDRV1 = 100µA, 5.5V < VIN < 28V5mV
DRV1 Sink CurrentVFBL1 = 1.175V, VDRV1 = 5V310mA
DRV1 Off-Leakage CurrentVFBL1 = 1.5V, VDRV1 = 28V0.110µA
FBL1 Input Common-Mode Range(Note 2)-0.1+1.5V
Soft-Start Step SizeMeasured at FBL11.238 / 32V
Soft-Start PeriodFREQ = GND1024/fOSCsFREQ = VL2048/fOSC
POSITIVE LINEAR REGULATORS (LR2 AND LR3)
FBL_ Regulation VoltageVDRV_ = 5V, IDRV_ = 100µA1.2261.2451.264V
FBL_ Input Bias CurrentVFBL _ = 1.5V-50+50nA
FBL_ Effective Load Regulation
Error (Transconductance)VDRV_ = 5V, IDRV_ = 50µA to 1mA-1.5-2%
FBL_ Line Regulation ErrorIDRV_ = 100µA, 5.5V < VIN < 28V5mV
DRV_ Sink CurrentVFBL_ = 1.175V, VDRV_ = 5V24mA
DRV_ Off-Leakage CurrentVFBL _ = 1.5V, VDRV_ = 28V0.110µA
FBL_ Input Common-Mode Range(Note 2)-0.1+1.5V
Soft-Start Step SizeMeasured at FBL_1.238 / 32V
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Electrical Characteristics (continued)
(Circuit of Figure 1, VIN = 12V, VEN = VSEQ = 5V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
(Circuit of Figure 1, VIN = 12V, VEN = VSEQ = 5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETERCONDITIONSMINTYPMAXUNITS
Soft-Start PeriodFREQ = GND1024 / fOSCs
FREQ = VL2048 / fOSC
POSITIVE LINEAR REGULATOR (LR4)
FBL4 Regulation VoltageVDRV4 = 5V, IDRV4 = 500µA1.2261.2451.264V
FBL4 Input Bias CurrentVFBL4 = 1.5V-50+50nA
FBL4 Effective Load Regulation
Error (Transconductance)VDRV4 = 5V, IDRV4 = 500µA to 10mA-1.5-2%
FBL4 Line Regulation ErrorIDRV4 = 500µA, 5.5V < VIN < 28V5mV
DRV4 Sink CurrentVFBL4 = 1.175V, VDRV4 = 5V1028mA
DRV4_Off-Leakage CurrentVFBL4 = 1.5V, VDRV4 = 28V0.110µA
FBL4 Input Common-Mode Range(Note 2)-0.1+1.5V
Soft-Start Step SizeMeasured at FBL41.238 / 32V
Soft-Start PeriodFREQ = GND1024 / fOSCsFREQ = VL2048 / fOSC
NEGATIVE LINEAR REGULATOR (LR5)
FBL5 Regulation VoltageVDRV5 = -10V, IDRV5 = 100µA100125150mV
FBL5 Input Bias CurrentVFBL5 = 0V-50+50nA
FBL5 Effective Load Regulation
Error (Transconductance)VDRV5 = -10V, IDRV5 = 50µA to 1mA-1.5-2%
FBL5 Line Regulation ErrorIDRV5 = 100µA, 5.5V < VIN < 28V5mV
DRV5 Source CurrentVFBL5 = 200mV, VDRV5 = -10V29mA
DRV5 Off-Leakage CurrentVFBL5 = 0V, VDRV5 = -20V0.110µA
FBL5 Input Common-Mode Range(Note 2)-0.1+15V
Soft-Start Step SizeMeasured at FBL51.238 / 32V
Soft-Start PeriodFREQ = AGND1024 / fOSCsFREQ = VL2048 / fOSC
PARAMETERCONDITIONSMINTYPMAXUNITS
GENERAL
Operating Input Voltage Range(Note 1)4.528.0V
VL REGULATOR
VL Output Voltage5.5V < VIN < 28V, 0 < IVL < 30mA4.755.25V
VL Undervoltage Lockout
ThresholdVL rising, 3% hysteresis3.23.8V
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Electrical Characteristics (continued)
Electrical Characteristics
Note 1: Operating supply range is guaranteed by VL line regulation test for the range of 5.5V to 28V. Between 4.5V and 5.5V, theVL
regulator might be in dropout; however, the part continues to operate properly.
Note 2: Guaranteed by design and not production tested.
Note 3: Specifications to -40°C are guaranteed by design and not production tested.
(Circuit of Figure 1, VIN = 12V, VEN = VSEQ = 5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETERCONDITIONSMINTYPMAXUNITS
CONTROL AND SEQUENCE
ONL_ Input ThresholdONL_ rising, 25mV hysteresis1.2011.275V
EN Input ThresholdEN rising, 5% hysteresis1.2011.275V
FAULT DETECTION
FB, FBL1, FBL2, FBL3, FBL4
Fault Trip Level
FB, FBL1, FBL2, FBL3, FBL4 falling,
25mV hysteresis1.0811.147V
FBL5 Fault Trip LevelFBL5 rising, 25mV hysteresis300500mV
Overcurrent Protection Threshold(VCSH - VCSL)270330mV
RESET FUNCTION
RSTIN Reset Trip LevelRSTIN falling, 25mV hysteresis1.0811.147V
STEP-DOWN CONTROLLER
ERROR AMPLIFIER
FB Regulation Voltage1.2151.260V
Current-Limit Threshold
(Default Mode)PGND - LX, ILIM = VL170330mV
Current-Limit Threshold
(Adjustable Mode)PGND - LX, VILIM = 1.25V170330mV
LINEAR REGULATOR CONTROLLERS
POSITIVE LINEAR REGULATOR (LR1)
FBL1 Regulation VoltageVDRV1 = 5V, IDRV1 = 100µA1.2201.270V
FBL1 Input Bias CurrentVFBL1 = 1.5V-50+50nA
POSITIVE LINEAR REGULATORS (LR2 AND LR3)
FBL_ Regulation VoltageVDRV_ = 5V, IDRV_ = 100µA1.2201.270V
FBL_ Input Bias CurrentVFBL_ = 1.5V-50+50nA
POSITIVE LINEAR REGULATOR (LR4)
FBL4 Regulation VoltageVDRV4 = 5V, IDRV4 = 500µA1.2201.270V
FBL4 Input Bias CurrentVFBL4 = 1.5V-50+50nA
NEGATIVE LINEAR REGULATOR (LR5)
FBL5 Regulation VoltageVDRV5 = -10V, IDRV5 = 100µA100150mV
FBL5 Input Bias CurrentVFBL5 = 0V-50+50nA
DRV5 Source CurrentVFBL5 = 200mV, VDRV5 = -10V2mA
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Electrical Characteristics (continued)
(Circuit of Figure 1; including R5, R6, and D2; TA = +25°C, unless otherwise noted.)
STEP-DOWN EFFICIENCY
vs. LOAD CURRENT
MAX1530 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 12V
fSW = 500kHz
VIN = 20V
STEP-DOWN LOAD
REGULATION
MAX1530 toc02
LOAD CURRENT (mA)
OUTPUT-VOLTAGE ERROR (%)
SWITCHING FREQUENCY
vs. LOAD CURRENT
FREQUENCY (kHz)
MAX1530 toc03
LOAD CURRENT (mA)
STEP-DOWN REGULATOR
LOAD TRANSIENT
MAX1530 toc04
40µs/div
A: LOAD CURRENT, 1A/div
B: OUTPUT VOLTAGE, 200mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 1A/div
3.3V
STEP-DOWN REGULATOR
SWITCHING WAVEFORM
MAX1530 toc05
2µs/div
A: LX, 10V/div
B: OUTPUT VOLTAGE, 20 mV/div, AC-COUPLED
C: INDUCTOR CURRENT, 1A/div
3.3V
STEP-DOWN REGULATOR
SOFT-START
MAX1530 toc06
1µs/div
A: EN, 2V/div
B: OUTPUT VOLTAGE, 2V/div
C: INDUCTOR CURRENT, 1A/div
VL LOAD REGULATION
MAX1530 toc07
VL OUTPUT ERROR (%)2015105
STARTUP SEQUENCE
MAX1530 toc08
4ms/div
LR1 BASE CURRENT
vs. DRV1 VOLTAGE
MAX1530 toc09
BASE CURRENT (mA)64210
VFBL1 = 1.175V
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Typical Operating Characteristics
(Circuit of Figure 1; including R5, R6, and D2; TA = +25°C, unless otherwise noted.)
LR1 NORMALIZED LOAD REGULATION
MAX1530 toc10
LOAD CURRENT (mA)
VOLTAGE ERROR (%)
LR1 NORMALIZED LINE REGULATION
MAX1530 toc11
INPUT VOLTAGE (V)
OUTPUT-VOLTAGE ERROR (%)43
200mA LOAD CURRENT
LR1 LOAD TRANSIENT
MAX1530 toc12
40µs/div
A: LR1 OUTPUT VOLTAGE, 100mV/div, AC-COUPLED
B: LR1 LOAD CURRENT, 500mA/div
2.5V
0mA
LR2/LR3 BASE CURRENT
vs. DRV2/DRV3 VOLTAGE
MAX1530 toc13
DRV2/DRV3 VOLTAGE (V)
BASE CURRENT (mA)3215
VFBL2 = VFBL3 = 1.175V
LR2 NORMALIZED LOAD REGULATION
MAX1530 toc14
LOAD CURRENT (mA)
VOLTAGE ERROR (%)302010
LR2 NORMALIZED LINE REGULATION
MAX1530 toc15
INPUT VOLTAGE (V)
OUTPUT-VOLTAGE ERROR (%)1713
20mA LOAD CURRENT
LR3 NORMALIZED LOAD REGULATION
MAX1530 toc16
VOLTAGE ERROR (%)1284
LR3 NORMALIZED LINE REGULATION
MAX1530 toc17
OUTPUT-VOLTAGE ERROR (%)3228
20mA LOAD CURRENT
LR4 BASE CURRENT vs. DRV VOLTAGE
MAX1530 toc18
BASE CURRENT (mA)64210
VFBL4 = 1.175V
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Typical Operating Characteristics (continued)
(Circuit of Figure 1; including R5, R6, and D2; TA = +25°C, unless otherwise noted.)
LR4 NORMALIZED LOAD REGULATION
MAX1530 toc19
LOAD CURRENT (mA)
VOLTAGE ERROR (%)
LR4 LOAD TRANSIENT
MAX1530 toc21
40µs/div
A: LR4 OUTPUT VOLTAGE, 100mV/div, AC-COUPLED
B: LR4 LOAD CURRENT, 500mA/div
10V
0mA
MAX1531
OVERCURRENT PROTECTION (CSH, CSL)
MAX1530 toc23
20µs/div
LR4 NORMALIZED LINE REGULATION
MAX1530 toc20
INPUT VOLTAGE (V)
OUTPUT-VOLTAGE ERROR (%)1713
200mA LOAD CURRENT
LR4 PULSED LOAD TRANSIENT
MAX1530 toc22
10µs/div
A: LR4 OUTPUT VOLTAGE, 100mV/div, AC-COUPLED
B: LR4 LOAD CURRENT, 1A/div
10V
LR5 BASE CURRENT
vs. DRV5 VOLTAGE
MAX1530 toc24
BASE CURRENT (mA)3215
VFBL5 = 0V
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Typical Operating Characteristics (continued)
(Circuit of Figure 1; including R5, R6, and D2; TA = +25°C, unless otherwise noted.)
PINNAMEFUNCTION
MAX1530MAX15311DRV2
Gamma Linear Regulator (LR2) Base Drive. Open drain of an internal N-channel
MOSFET. Connect DRV2 to the base of an external PNP pass transistor to form a
positive linear regulator. (See the Pass Transistor Selection section.)2FBL2
Gamma Linear Regulator (LR2) Feedback Input. FBL2 regulates at 1.245V nominal.
Connect FBL2 to the center tap of a resistive voltage-divider between the LR2 output
and AGND to set the output voltage. Place the divider close to the FBL2 pin.3FBL3
Gate-On Linear Regulator (LR3) Feedback Input. FBL3 regulates at 1.245V nominal.
Connect FBL3 to the center tap of a resistive voltage-divider between the LR3 output
and AGND to set the output voltage. Place the divider close to the FBL3 pin.4DRV3
Gate-On Linear Regulator (LR3) Base Drive. Open drain of an internal N-channel
MOSFET. Connect DRV3 to the base of an external PNP pass transistor to form a
positive linear regulator. (See the Pass Transistor Selection section.)
5–10,
18, 19—N. C.No Connection. Not internally connected.11RSTIN
Adjustable Reset Input. RESET asserts low when the monitored voltage is less
than the reset trip threshold. RESET goes to a high-impedance state only after the
monitored voltage remains above the reset trip threshold for the duration of the reset
timeout period. Connect RSTIN to the center tap of a resistive voltage-divider between
the monitored output voltage and AGND to set the reset trip threshold. The internal
RSTIN threshold of 90% of 1.238V allows direct connection of RSTIN to any of the
device’s positive feedback pins.
LR5 NORMALIZED LOAD REGULATION
MAX1530 toc25
LOAD CURRENT (mA)
VOLTAGE ERROR (%)302010
LR5 NORMALIZED LINE REGULATION
MAX1530 toc26
INPUT VOLTAGE (V)
OUTPUT-VOLTAGE ERROR (%)
20mA LOAD CURRENT
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Typical Operating Characteristics (continued)
Pin Description
PIN
NAMEFUNCTIONMAX1530MAX153112RESET
Open-Drain Reset Output. RESET asserts low when the monitored voltage is less
than the reset trip threshold. RESET goes to a high-impedance state only after the
monitored voltage remains above the reset trip threshold for the duration of the reset
timeout period. RESET also asserts low when VL is less than the VL undervoltage
lockout threshold, EN is low, or the thermal, overcurrent or undervoltage fault latches
are set.13COMP
Step-Down Regulator Compensation Input. A pole-zero pair must be added to
compensate the control loop by connecting a series resistor and capacitor from COMP
to AGND. (See the Compensation Design section.)14FB
Step-Down Regulator Feedback Input. FB regulates at 1.238V nominal. Connect FB
to the center tap of a resistive voltage-divider between the step-down regulator output
and AGND to set the output voltage. Place the divider close to the FB pin.15ILIM
Step-Down Regulator Current-Limit Control Input. Connect this dual-mode input to VL
to set the current-limit threshold to its default value of 250mV. The overcurrent
comparator compares the voltage across the low-side N-channel MOSFET with
the current-limit threshold. Connect ILIM to the center tap of a resistive voltage-
divider between VL and AGND to adjust the current-limit threshold to other values. In
adjustable mode, the actual current-limit threshold is 1/5th of the voltage at ILIM over
a 0.25V to 3.0V range. The dual- mode threshold for switchover to the 250mV default
value is approximately 3.5V.16ONL2
Gamma Linear Regulator (LR2) Enable Input. When EN is above its enable threshold,
VL is above its UVLO threshold, and ONL2 is greater than the internal reference, LR2
is enabled. Drive ONL2 with a logic signal or, for automatic sequencing, connect a
capacitor from ONL2 to AGND. If SEQ is high, EN is above its threshold, and VL is
above its UVLO threshold, an internal 2µA (typ) current source charges the capacitor.
Otherwise, an internal switch discharges the capacitor. Connecting various capacitors
to each ONL_ pin allows the programming of the startup sequence.17ONL3
Gate-On Linear Regulator (LR3) Enable Input. When EN is above its enable threshold,
VL is above its UVLO threshold, and ONL3 is greater than the internal reference, LR3
is enabled. Drive ONL3 with a logic signal or, for automatic sequencing, connect a
capacitor from ONL3 to AGND. If SEQ is high, EN is above its threshold, and VL is
above its UVLO threshold, an internal 2µA (typ) current source charges the capacitor.
Otherwise, an internal switch discharges the capacitor. Connecting various capacitors
to each ONL_ pin allows the programming of the startup sequence.20PGNDPower Ground21DLLow-Side Gate Driver Output. DL drives the synchronous rectiier of the step-down
regulator. DL swings from PGND to VL. DL remains low until VL rises above the UVLO
threshold.22LX
Step-Down Regulator Current-Sense Input. The IC’s current-sense ampliier inputs
for current-mode control connect to IN and LX. Connect IN and LX directly to the
high-side N- channel MOSFET drain and source, respectively. The low-side current-
limit comparator inputs connect to LX and PGND to sense voltage across a low-side
N-channel MOSFET.
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Pin Description (continued)
PINNAMEFUNCTION
MAX1530MAX153123DHHigh-Side Gate Driver Output. DH drives the main switch of the step-down regulator.
DH swings from LX to BST.24BSTStep-Down Regulator Boostrap Capacitor Connection for High-Side Gate Driver.
Connect a 0.1µF ceramic capacitor from BST to LX.25SEQSequence Control Input for LR2, LR3, LR4, and LR5. Controls the current sources and
switches that charge and discharge the capacitors connected to the ONL_ pins.26FREQOscillator Frequency Select Input. Connect FREQ to VL for 500kHz operation. Connect
FREQ to AGND for 250kHz operation.27IN
Main Input Voltage (+4.5V to 28V). Bypass IN to AGND with a 1µF ceramic capacitor
close to the pins. IN powers the VL linear regulator. Connect IN to the drain of the high- side MOSFET (for current sense) through a 1Ω resistor.28VL
Internal 5V Linear Regulator Output. Connect a minimum 1µF ceramic capacitor from
VL to AGND. Place the capacitor close to the pins. VL can supply up to 30mA for gate
drive and external loads. VL remains active when EN is low.29AGNDAnalog Ground30EN
Enable Input. This general-purpose on/off control input has an accurate 1.238V (typ)
rising threshold with 5% hysteresis. This allows EN to monitor an input voltage level or
other analog parameter. If EN is less than its threshold, then the main step-down and
all linear regulators are turned off. VL and the internal reference remain active when EN
is low. The rising edge of EN clears any latched faults except for a thermal fault, which is cleared only by cycling the input power. An internal ilter with a 10µs time constant
prevents short glitches from accidentally clearing the fault latch.31FBL1
Low-Voltage Logic Linear Regulator (LR1) Feedback Input. FBL1 regulates at 1.245V
nominal. Connect FBL1 to the center tap of a resistive voltage-divider between LR1
output AGND to set the output voltage. Place the divider close to the FBL1 pin. LR1
starts automatically after the step-down converter soft-start ends.32DRV1
Low-Voltage Logic Linear Regulator (LR1) Base Drive. Open drain of an internal
N-channel MOSFET. Connect DRV1 to the base of an external PNP pass transistor.
(See the Pass Transistor Selection section.)5CSH
Overcurrent Protection Positive Input. CSH is also the supply input for the overcurrent
sense block. CSH and CSL can be used to sense any current in the application circuit
and to shut the device down in an overcurrent condition. This feature is typically used
to protect the main input or the input to one of the linear regulators since they do not
have their own current limits. Insert an appropriate sense resistor in series with the
protected input and connect CSH and CSL to its positive and negative terminals. The
controller sets the fault latch when VCSH - VCSL exceeds the 300mV (typ) overcurrent threshold. An internal lowpass ilter prevents large currents of short duration (less than
50µs) or noise glitches from setting the latch. If the overcurrent protection is not used,
connect CSH and CSL to VL.6CSLOvercurrent Protection Negative Input. See CSH above.
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Pin Description (continued)
PINNAMEFUNCTION
MAX1530MAX15317FBL4
Source Drive Linear Regulator (LR4) Feedback Input. FBL4 regulates at 1.245V
nominal. Connect FBL4 to the center tap of a resistive voltage-divider between the LR4
output and AGND to set the output voltage. Place the divider close to the FBL4 pin.8DRV4
Source Drive Linear Regulator (LR4) Base Drive. Open drain of an internal N-channel
MOSFET. Connect DRV4 to the base of an external PNP pass transistor to form a
positive linear regulator. (See the Pass Transistor Selection section.)9FBL5
Gate-Off Linear Regulator (LR5) Feedback Input. FBL5 regulates at 125mV nominal.
Connect FBL5 to the center tap of a resistive voltage-divider between the LR5 output
and the internal 5V linear regulator output (VL) to set the output voltage. Place the
divider close to the FBL5 pin.10DRV5
Gate-Off Linear Regulator (LR5) Base Drive. Open drain of an internal P-channel
MOSFET. Connect DRV5 to the base of an external NPN pass transistor to form a
negative linear voltage regulator. (See the Pass Transistor Selection section.)18ONL4
Source Drive Linear Regulator (LR4) Enable Input. When EN is above its enable
threshold, VL is above its UVLO threshold, and ONL4 is greater than the internal
reference, LR4 is enabled. Drive ONL4 with a logic signal or, for automatic sequencing,
connect a capacitor from ONL4 to AGND. If SEQ is high, EN is above its threshold,
and VL is above its UVLO threshold, an internal 2µA (typ) current source charges the
capacitor. Otherwise, an internal switch discharges the capacitor. Connecting various
capacitors to each ONL_ pin allows the programming of the startup sequence.19ONL5
Gate-Off Linear Regulator (LR5) Enable Input. When EN is above its enable threshold,
VL is above its UVLO threshold, and ONL5 is greater than the internal reference, LR5
is enabled. Drive ONL5 with a logic signal or, for automatic sequencing, connect a
capacitor from ONL5 to AGND. If SEQ is high, EN is above its threshold, and VL is
above its UVLO threshold, an internal 2µA (typ) current source charges the capacitor.
Otherwise, an internal switch discharges the capacitor. Connecting various capacitors
to each ONL_ pin allows the programming of the startup sequence.—EPExposed Paddle. Internally connected to GND. Connect EP to a large ground plane to
improve thermal dissipation. Do not use as the main ground connection of the IC.
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Pin Description (continued)
MAX1531
N1-A
N1-B
VIN = 12V
ONL2
ONL3
ONL4
ONL5
FREQ
SEQ
RESETINBST
PGND
DRV1
FBL1
COMP
DRV3
FBL3
ILIM
DRV5
FBL5
FBL4
DRV4
CSH
CSL
FBL2
DRV2
RSTINAGND
4.7µF
25V
20.0kΩ
R5*
10Ω
1µF
0.1µF
1µF
C10
470pF
10µF
6.3V
22µF
6.3V
C23
150pF
C22
2.2µF
R11
100kΩ
10kΩ
6.8kΩ
R10
10kΩ
R14
121kΩ
R15
68.1kΩ
R16
43.2kΩ
R17
6.8kΩ
R18
68.1kΩ
R20
0.5Ω
R22
75kΩ
R19
10kΩ
R23
10.7kΩ
C11
0.1µF
C20
0.1µF
C21
2.2µF
C13
4.7µF
16V
C12
0.47µF
R29
48.7kΩ
R28
90.9kΩ
R25
200kΩ
R26
10.5kΩ
R27
6.8kΩ
C19
0.47µF
*OPTIONAL
C16
0.47µF
C15
0.1µF
0.1µFC6
0.1µF
C14
0.1µF
C18
0.1µFC17
0.1µF
R24
6.8kΩ
R13
150kΩ
R12
300kΩ
10.7kΩ
17.8kΩ
10µH
100kΩ
124kΩ
R12
R6*
10Ω
D2*
C2, OPEN
VIN
VIN
VOUT
3.3V/1.5A
VL
5V/30mA
VLOGIC
2.5V/500mA
VGOFF
-9V/50mA
VGON
25V/20mA
VGAMMA
9.7V/50mA
VSOURCE
10V/500mA
VIN
R21
1.5kΩ
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Figure 2. MAX1530 Standard Application Circuit
MAX1530
N1-A
N1-B
VIN = 12V
ONL2
ONL3
N.C.
N.C.
N.C.
N.C.
FREQ
SEQ
RESETIN
BST
PGND
DRV1
FBL1
COMP
DRV3
FBL3
ILIMFBL2
DRV2
RSTIN
N.C.
N.C.
N.C.
N.C.AGND
4.7µF
25V
20.0kΩ
1µF
0.1mF
1µF
C10
470pF
10µF
6.3V
22µF
6.3V
C22
2.2µF
R11
100kΩ
10kΩ
6.8kΩ
R10
10kΩ
R14
121kΩ
R17
6.8kΩ
R18
68.1kΩ
R19
10kΩ
C11
0.1µF
C20
0.1µF
C12
0.47µF
R22
75kΩ
R23
10.7kΩ
C13
4.7µF
C21
2.2µF
R24
6.8kΩ
R13
150kΩ
R12
300kΩ
10.7kΩ
17.8kΩ
10µH
100kΩ
124kΩ
R12
C2, OPEN
VIN
VOUT
3.3V/1.5A
VL
5V/30mA
VLOGIC
2.5V/500mA
VSOURCE
10V/500mA
VGAMMA
9.7V/50mA
VIN
*OPTIONAL
R5*
10Ω
R6*
10Ω
D2*
C23
150pF
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
Standard Application Circuit
The standard application circuit (Figure 1) of the MAX1531
is a complete power-supply system for TFT LCD moni-
tors. The circuit generates a 3.3V/1.5A main output, a
2.5V/500mA output for the timing controller and digital
sections of source/gate drive ICs, a 10V/500mA source
drive supply voltage, a 9.7V/50mA gamma reference, a
25V/20mA gate-on voltage, and a -10V/50mA gate-off
voltage. The input voltage is 12V ±10%. Table 1 lists the
selected components and Table 2 lists the component
suppliers. The standard application circuit (Figure 2) of
the MAX1530 is similar to the MAX1531 application circuit
except that gate-on and gate-off voltages are eliminated.
Detailed Description
The MAX1530/MAX1531 power-supply controllers provide
logic and bias power for LCD monitors. Figure 3 shows
the IC functional diagram. The main step-down controller
employs a current-mode PWM control method to ease
compensation requirements and provide excellent load-
and line-transient response. The use of synchronous rec-
tification yields excellent efficiency.
The MAX1530 includes three analog gain blocks to control
three auxiliary positive linear regulators, and the MAX1531
includes five analog gain blocks to control four positive and
one negative linear regulators. Use the positive gain blocks
to generate low-voltage rails directly from the input voltage
or the main step-down converter output, or higher voltages
using charge pumps attached to the switching node or
Table 1. Selected Component List
Table 2. Component Suppliers
*For MAX1531 only.
DESIGNATIONDESCRIPTION4.7µF, 25V X7R ceramic capacitor
(1210) TDK C3225X7R1E475K22µF, 6.3V X7R ceramic capacitor
TDK C3216X7R0J226M10µF, 6.3V X5R ceramic capacitor
TDK C2012X5R0J106M
C12, C19*0.47µF, 16V X7R ceramic capacitors
(0805) TDK C2012X7R1C474K
C134.7µF, 16V X7R ceramic capacitor
TDK C3216X7R1C475K
C21, C222.2µF, 25V X7R ceramic capacitors
(1206) TDK C3216X7R1C475M
D1, D6*100mA, 30V Schottky diodes (SOD523)
Central Semiconductor CMOSH-3
100mA, 75V, small-signal switching
diode, SOT23 Fairchild Semiconductor
MMBD4148
DESIGNATIONDESCRIPTION
D3*, D4*, D5*200mA, 25V dual Schottky diodes
(SOT23) Fairchild BAT54S10µH, 2.3A (DC) inductor
Sumida CDR7D28MN-100
2.5A, 30V dual N-channel MOSFET
(6-pin Super SOT)
Fairchild FDC6561AN
Q1, Q4
3A, 60V low-saturation PNP bipolar
transistors
(SOT-223) Fairchild NZT660A
Q2, Q3*200mA, 40V PNP bipolar transistors
(SOT23) Fairchild MMBT3906
Q5*, Q6*200mA, 40V NPN bipolar transistors
(SOT23) Fairchild MMBT3904
SUPPLIERPHONEFAXWEBSITE
Central Semi516-435-1110516-435-1824www.centralsemi.com
Fairchild888-522-5372972-910-8036www.fairchildsemi.com
Sumida847-956-0666847-956-0702www.sumida.com
TDK847-803-6100847-390-4405www.components.tdk.com
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors
MAX1531
OSCREF
SLOPECLOCK
TIMER
VLOK
VREF
SEQUENCE
0.9VREF
VREF
0.9VREF
VREF
SOFT-
START
0.9VREF
VREF
0.9VREF
VREF
SOFT-
START
SOFT-
START
SOFT-
START
SOFT-
START
400mV
VREF
THERMALFAULT
LOGIC
ON2
ON3
ON4
ON5
LDO3EN
FLT3
LDO4EN
FLT4
FLT5FLT2
FLT1
LDO2ENLDO5EN
VLOKEN
FREQ
RSTIN
RESET
GND
COMP
SEQ
ONL2
ONL3
ONL4
ONL5
LR1
LR2
LR3
LR4
LR5
FBL1
DRV1
DRV2DRV5
DRV4
DRV3
FBL2FBL5
FBL4
FBL3
ILIM
FLTM
300mV
CSH
CSLFLTCS
PGND
BST
SS DONEFLTMDC-DC EN
STEP-DOWN
CONTROLLER
COMP
ILIM
PGND
HIGH-SIDE
DRIVER
LOW-SIDE
DRIVER
SEQ
MAX1530/MAX1531Multiple-Output Power-Supply
Controllers for LCD Monitors

Partno	Mfg	Dc	Qty	Available	Descript
MAX1530ETJ+T	MAXIM	N/a	5	avai	Multiple-Output Power-Supply Controllers for LCD Monitors
MAX1531ETJ+ \|MAX1531ETJ	MAXIM	N/a	85	avai	Multiple-Output Power-Supply Controllers for LCD Monitors
MAX1531ETJ+ \|MAX1531ETJ	MAX	N/a	880	avai	Multiple-Output Power-Supply Controllers for LCD Monitors
MAX1531ETJ+T	MAXIM	N/a	2687	avai	Multiple-Output Power-Supply Controllers for LCD Monitors