MAX5083ATE Fast Delivery |IC PHOENIX CO.,LIMITED

MAX5083ATE ,1.5A, 40V, MAXPower Step-Down DC-DC ConvertersApplications® *EP = Exposed pad.● FireWire Power Supplies ● Industrial● Distributed Power Pin Confi ..
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MAX508ACPP+ ,Voltage-Output, 12-Bit DAC with Internal Reference and 12-Bit InterfaceGeneral Description The MAX507/MAX508 are complete 12-bit, voltage- output digital-to-analog co ..
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MAX508AEPP+ ,Voltage-Output, 12-Bit DAC with Internal Reference and 12-Bit InterfaceELECTRICAL CHARACTERISTICS Single Supply (VDD = +11.4V to +15.75V, Vss = AGND = DGND = 0V, RL = ..
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MAX5083ATE
1.5A, 40V, MAXPower Step-Down DC-DC Converters
General Description
The MAX5082/MAX5083 are 250kHz PWM step-down DC-DC converters with an on-chip, 0.3Ω high-side switch. The input voltage range is 4.5V to 40V for the MAX5082 and 7.5V to 40V for the MAX5083. The output is adjustable from 1.23V to 32V and can deliver up to 1.5A of load current.
Both devices utilize a voltage-mode control scheme for good noise immunity in the high-voltage switching envi-ronment and offer external compensation allowing for maximum flexibility with a wide selection of inductor values and capacitor types. The switching frequency is internally fixed at 250kHz and can be synchronized to an external clock signal through the SYNC input. Light load efficiency is improved by automatically switching to a pulse-skip mode.
All devices include programmable undervoltage lockout and soft-start. Protection features include cycle-bycycle current limit, hiccup-mode output short-circuit protection, and ther-mal shutdown. Both devices are available in a space-saving, high-power (2.7W), 16-pin TQFN package and are rated for operation over the -40°C to +125°C temperature range.
Applications●FireWire® Power Supplies ● Industrial●Distributed Power
Features●4.5V to 40V (MAX5082) or 7.5V to 40V (MAX5083) Input Voltage Range●1.5A Output Current●VOUT Range From 1.23V to 32V●Internal High-Side Switch●Fixed 250kHz Internal Oscillator●Automatic Switchover to Pulse-Skip Mode at Light Loads●External Frequency Synchronization●Thermal Shutdown and Short-Circuit Protection●Operates Over the -40°C to +125°C Temperature Range●Space-Saving (5mm x 5mm) High-Power 16-Pin TQFN Package
Pin Configurations appears at end of data sheet.
*EP = Exposed pad.
FireWire is a registered trademark of Apple Computer, Inc.
Typical Operating Circuits continued at end of data sheet.
PARTTEMP RANGEPIN-PACKAGE
MAX5082ATE-40°C to +125°C16 TQFN-EP*
MAX5083ATE-40°C to +125°C16 TQFN-EP*
VIN
4.5V TO 40V
ON/OFF
PGND
REG
SYNCSGNDPGNDSSCOMP
DVREGC-
VOUT
PGND
CBST
CSSBST
MAX5082
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters
Typical Application Circuits
Ordering Information
EVALUATION KIT AVAILABLE
IN, ON/OFF to SGND..............................................-0.3V to +45VLX to SGND.................................................-0.3V to (VIN + 0.3V)BST to SGND................................................-0.3V to (VIN + 12V)BST to LX................................................................-0.3V to +12VPGND to SGND.....................................................-0.3V to +0.3VREG, DVREG, SYNC to SGND...............................-0.3V to +12VFB, COMP, SS to SGND..........................-0.3V to (VREG + 0.3V)C+ to PGND (MAX5082 only)..............(VDVREG - 0.3V) to +12VC- to PGND (MAX5082 only)..............-0.3V to (VDVREG + 0.3V)Continuous current through internal power MOSFET (pins 11/12connected together and pins 13/14 connected together)
TJ = +125°C.........................................................................3A
TJ = +150°C.........................................................................2AContinuous Power Dissipation* (TA = +70°C) 16-Pin TQFN (derate 33.3mW/°C above +70°C)....2666.7mW 16-Pin TQFN (θJA).......................................................30°C/W 16-Pin TQFN (θJC)......................................................1.7°C/WOperating Temperature Range...........................-40oC to +125°CMaximum Junction Temperature.......................................+150°CStorage Temperature Range..............................-60°C to +150°CLead Temperature (soldering, 10s)...................................+300°C
*As per JEDEC 51 Standard.
(VIN = VON/OFF = 12V, VREG = VDVREG, VSYNC = PGND = SGND, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values
are at TA = + 25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input Voltage RangeVINMAX50824.540V
MAX50837.540
Undervoltage Lockout ThresholdUVLOVIN rising, MAX50823.94.2VVIN rising, MAX50836.87.3
Undervoltage Lockout HysteresisUVLOHYSTMAX50820.4VMAX50830.7
Switching Supply Current (PWMOperation)ISWVFB = 0V, MAX508210.5mAVFB = 0V, MAX50839.5
Eficiency
VIN = 12V, VOUT = 3.3V, IOUT = 1.5A84VIN = 4.5V, VOUT = 3.3V, IOUT = 1.5A(MAX5082)88
No-Load Supply Current(PFM Operation)
MAX50821.42.5mAMAX50831.32.3
Shutdown CurrentISHDNVON/OFF = 0V, VIN = 40V200300µA
ON/OFF CONTROL
Input Voltage ThresholdVON/OFFVON/OFF rising1.201.231.25V
Input Voltage Hysteresis0.12V
Input Bias CurrentVON/OFF = 0 to 40V-250+250nA
ERROR AMPLIFIER/SOFT-START
Soft-Start CurrentISS81524µA
Reference Voltage (Soft-Start)VSS1.2151.2281.240V
FB Regulation VoltageVFBICOMP = -500μA to +500μA1.2151.2281.240V
FB Input Range01.5V
FB Input Current-250+250nA
COMP Voltage RangeICOMP = -500μA to +500μA0.254.50V
Open-Loop Gain80dB
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters
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
(VIN = VON/OFF = 12V, VREG = VDVREG, VSYNC = PGND = SGND, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values
are at TA = + 25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
OSCILLATOR
FrequencyfSWVSYNC = 0V225250275kHz
Maximum Duty CycleDMAX
VSYNC = 0V, VIN = 4.5V, MAX508287VSYNC = 0V, VIN = 7.5V, MAX508387
VSYNC = 0V, VIN ≤ 40V87
SYNC High-Level Voltage2.2V
SYNC Low-Level Voltage0.8V
SYNC Frequency RangefSYNC150350kHz
PWM Modulator GainfSYNC = 150kHz to 350kHz10V/V
Ramp Level Shift (Valley)0.3V
POWER SWITCH
Switch On-ResistanceVBST - VLX = 6V0.30.6Ω
Switch Gate ChargeVBST - VLX = 6V6nC
Switch Leakage CurrentVIN = 40V, VLX = VBST = 0V10µA
BST Leakage CurrentVBST = VLX = VIN = 40V10µA
CHARGE PUMP
C- Output Voltage LowMAX5082 only, sinking 10mA0.1V
C- Output Voltage HighMAX5082 only, relative to DVREG, sourcing 10mA0.1V
DVREG to C+ On-ResistanceMAX5082 only, sourcing 10mA10Ω
LX to PGND On-ResistanceSinking 10mA12Ω
CURRENT-LIMIT COMPARATOR
Pulse-Skip ThresholdIPFM100200300mA
Cycle-by-Cycle Current LimitIILIM1.92.73.5A
Number of Consecutive ILIM
Events to Hiccup4
Hiccup Timeout512Clock
periods
INTERNAL VOLTAGE REGULATOR
Output VoltageVREG
MAX50824.7555.25VMAX50837.688.4
Line RegulationVIN = 5.5V to 40V, MAX50821mV/VVIN = 9.0V to 40V, MAX50831
Load RegulationIREG = 0 to 20mA0.25V
Dropout VoltageVIN = 4.5V, IREG = 20mA, MAX50820.5VVIN = 4.5V, IREG = 20mA, MAX50830.5
THERMAL SHUTDOWN
Thermal Shutdown TemperatureTemperature rising+160°C
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters
Electrical Characteristics (continued)
(VIN = 12V, see Figure 5 (MAX5082) and Figure 6 (MAX5083), TA = +25°C, unless otherwise noted.)
UNDERVOLTAGE LOCKOUT HYSTERESIS
vs. TEMPERATURE (MAX5083)
MAX5082/3 toc02
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT HYSTERESIS (V)
ON/OFF THRESHOLD HYSTERESIS
vs. TEMPERATURE
MAX5082/3 toc03
TEMPERATURE (°C)
ON/
OFF
THRESHOLD HSYSTERESIS (V)
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5082)
MAX5082/3 toc04
INPUT VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (µA)30202510155
TA = +135°C
TA = +25°C
TA = +85°C
TA = -40°C
VON/OFF = 0V
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5083)
MAX5082/3 toc05
INPUT VOLTAGE (V)
SHUTDOWN SYPPLY CURRENT (µA)30202510155
TA = +135°C
TA = +25°C
TA = +85°C
TA = -40°C
VON/OFF = 0V
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (MAX5082)
MAX5082/3 toc06
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)30510152025
TA = +135°C
TA = +25°C
TA = +85°C
TA = -40°C
UNDERVOLTAGE LOCKOUT HYSTERESIS
vs. TEMPERATURE (MAX5082)
MAX5082/3 toc01
TEMPERATURE (°C)
UNDERVOLTAGE LOCKOUT HYSTERESIS (V)
MAXIMUM DUTY CYCLE
vs. INPUT VOLTAGE (MAX5082)
MAX5082/3 toc08a
MAXIMUM DUTY CYCLE (%)30202510155
OPERATING FREQUENCY
vs. TEMPERATURE
MAX5082/3 toc07
OPERATING FREQUENCY (kHz)
VIN = 4.5V
VIN = 40V
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters
Typical Operating Characteristics
(VIN = 12V, see Figure 5 (MAX5082) and Figure 6 (MAX5083), TA = +25°C, unless otherwise noted.)
OPEN-LOOP GAIN/PHASE vs. FREQUENCY
MAX5082 toc10
FREQUENCY (kHz)
GAIN (dB)
PHASE (DEGREES)
17510,000
GAIN
PHASE
OUTPUT CURRENT LIMIT
vs. INPUT VOLTAGE
MAX5082/3 toc10
INPUT VOLTAGE (V)
OUTPUT CURRENT LIMIT (A)30202510155
MAX5082
TA = +135°C
TA = +25°C
TA = +85°C
TA = -40°C
OUTPUT IS
PULSED WITH 3% DUTY CYCLE
TURN-ON/OFF WAVEFORM
MAX5082/3 toc11a
VOUT
2V/div
2ms/div
ILOAD = 1A
VON/OFF
2V/div
TURN-ON/OFF WAVEFORM
MAX5082/3 toc11b
VON/OFF
2V/div
VOUT
2V/div
2µs/div
ILOAD = 100mA
OUTPUT VOLTAGE vs. TEMPERATURE
MAX5082/3 toc12
OUTPUT VOLTAGE (V)
MAX5082
ILOAD = 0A
ILOAD = 1A
MAXIMUM DUTY CYCLE
vs. INPUT VOLTAGE (MAX5083)
MAX5080 toc08b
INPUT VOLTAGE (V)
MAXIMUM DUTY CYCLE (%)30202510155
EFFICIENCY vs. LOAD CURRENT
MAX5082/3 toc13a
EFFICIENCY (%)
VIN = 40V,
VOUT = 3.3VMAX5082
VIN = 24V,
VOUT = 3.3V
VIN = 12V,
VOUT = 3.3V
VIN = 7.5V,
VOUT = 3.3V
VIN = 4.5V,
VOUT = 3.3V
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters
Typical Operating Characteristics (continued)
(VIN = 12V, see Figure 5 (MAX5082) and Figure 6 (MAX5083), TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
MAX5082/3 toc13b
LOAD CURRENT (A)
EFFICIENCY (%)
VIN = 40V,
VOUT = 5VMAX5083
VIN = 24V,
VOUT = 5V
VIN = 12V,
VOUT = 5V
VIN = 7.5V,
VOUT = 5V
LOAD-TRANSIENT RESPONSE
MAX5082/3 toc14
VOUT
AC-COUPLED
200m/V/div
ILOAD
1A/div
200µs/div
VIN = 12V, IOUT = 0.5A TO 1.5A
MAX5082
LX VOLTAGE AND INDUCTOR CURRENT
MAX5082/3 toc15
ILOAD = 40mA
INDUCTOR
CURRENT
200mA/div
VLX
5V/div
2µs/div
LX VOLTAGE AND INDUCTOR CURRENT
MAX5082/3 toc16
VLX
5V/div
INDUCTOR CURRENT
100mA/div
2µs/div
ILOAD = 140mA
LX VOLTAGE AND INDUCTOR CURRENT
MAX5082/3 toc17
VLX
5V/div
INDUCTOR CURRENT
500mA/div
2µs/div
ILOAD = 1A
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters
Typical Operating Characteristics (continued)
Detailed Description
The MAX5082/MAX5083 are voltage-mode buck con-verters with internal 0.3Ω power MOSFET switches. The MAX5082 has a wide input voltage range of 4.5V to 40V. The MAX5083’s input voltage range is 7.5V to 40V. The internal low RDS_ON switch allows for up to 1.5A of output current. The 250kHz fixed switching frequency, external compensation, and voltage feed-forward simplify loop com-
components. Both devices offer an automatic switchover to pulse-skipping (PFM) mode, providing low quiescent current and high efficiency at light loads. Under no load, a PFM mode operation reduces the current consumption to only 1.4mA. In shutdown, the supply current falls to 200μA. Additional features include an externally programmable undervoltage lockout through the ON/OFF pin, a program-mable soft-start, cycle-by-cycle current limit, hiccup mode
PINNAMEFUNCTIONMAX5082MAX50831COMPError Ampliier Output. Connect COMP to the compensation feedback network.2FBFeedback Regulation Point. Connect to the center tap of a resistive divider from converter output to SGND to set the output voltage. The FB voltage regulates to the voltage present at SS (1.23V).3ON/OFF
ON/OFF and External UVLO Control. The ON/OFF rising threshold is set to approximately 1.23V. Connect to the center tap of a resistive divider from IN to SGND to set the UVLO (rising) threshold. Pull ON/OFF to SGND to shut down the device. ON/OFF can be used for power-supply sequencing. Connect to IN for always-on operation.4SSSoft-Start and Reference Output. Connect a capacitor from SS to SGND to set the soft-start time. See the Applications Information section to calculate the value of the SS capacitor.5SYNCOscillator Synchronization Input. SYNC can be driven by an external 150kHz to 350kHz clock to synchronize the MAX5082/MAX5083’s switching frequency. Connect SYNC to SGND when not used.6DVREGGate Drive Supply for High-Side MOSFET Driver. Connect externally to REG for MAX5082.Connect to REG and the anode of the boost diode for MAX5083.—C+Charge-Pump Flying Capacitor Positive Connection—C-Charge-Pump Flying Capacitor Negative Connection7, 8N.C.No Connection. Not internally connected. Can be left loating or connected to SGND.9PGNDPower Ground Connection. Connect the input ilter capacitor’s negative terminal, the anode of the freewheeling diode, and the output ilter capacitor’s return to PGND. Connect externally to SGND at a single point near the input capacitor’s return terminal.10BSTHigh-Side Gate Driver Supply. Connect BST to the cathode of the boost diode and to the positive terminal of the boost capacitor.
11, 1211, 12LXSource Connection of Internal High-Side Switch. Connect the inductor and rectiier diode’s anode to LX.
13, 1413, 14INSupply Input Connection. Connect to an external voltage source from 4.5V to 40V (MAX5082) or a 7.5V to 40V (MAX5083).15REGInternal Regulator Output. 5V output for the MAX5082 and 8V output for the MAX5083. Bypass to SGND with at least a 1μF ceramic capacitor.16SGNDSignal Ground Connection. Solder the exposed pad to a large SGND plane. Connect SGND and PGND together at one point near the input bypass capacitor return terminal.EP—Exposed Pad. Connect exposed pad to SGND.
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters
Pin Description
Internal Linear Regulator (REG)
REG is the output terminal of a 5V (MAX5082), or 8V (MAX5083) LDO which is powered from IN and provides power to the IC. Connect REG externally to DVREG to provide power for the high-side MOSFET gate driver. Bypass REG to SGND with a ceramic capacitor of at least 1μF. Place the capacitor physically close to the MAX5082/MAX5083 to provide good bypassing. During normal operation, REG is intended for powering up only the inter-nal circuitry and should not be used to supply power to external loads.
Internal UVLO/External UVLO
The MAX5082/MAX5083 provides two undervoltage lock-outs (UVLOs). An internal UVLO looks at the input voltage (VIN) and is fixed at 4.1V (MAX5082) or 7.1V (MAX5083).
OFF pin. The external UVLO overrides the internal UVLO when the external UVLO is higher than the internal UVLO. During startup, before any operation begins, the input volt-age and the voltage at ON/OFF must exceed their respec-tive UVLOs. The external UVLO has a rising threshold of 1.23V with 0.12V of hysteresis. Program the external UVLO by connecting a resistive divider from IN to ON/OFF to SGND. Connect ON/OFF to IN directly to disable the external UVLO.
Driving ON/OFF to ground places the MAX5082/MAX5083
in shutdown. When in shutdown, the internal power MOSFET turns off, all internal circuitry shuts down and the quiescent supply current reduces to 200μA. Connect an RC network from ON/OFF to SGND to set a turn-on delay that can be used to sequence the output voltages of
Figure 1. MAX5082 Simplified Block Diagram
1.23V
1.23V
ON/OFF
DVREG
PCLK
LDO
REG
THERMAL
SHDNREF
0.3V
CLK
1.23V
REGOK
VREF
VREF
ISS
>1.23V ON
<1.11V OFF
COMP
SYNC
E/ASSA
CPWM
RAMP
LOGIC
OSC
CHARGE-PUMP
MANAGEMENT
PCLK
BST
SGND
PGND
SCLK
HIGH-SIDE
CURRENT
SENSEREF_PFM
PFM
REF_ILIM
ILIM
OVERL
CLK
ILIMOVERLOAD
MANAGEMENT
DVREGC+
DVREG
LEVEL
SHIFT
MAX5082
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters
Soft-Start and Reference (SS)
SS is the 1.23V reference bypass connection for the MAX5082/MAX5083 and also controls the soft-start peri-od. At startup, after VIN is applied and the internal and external UVLO thresholds are reached, the device enters soft-start. During soft-start, 15μA is sourced into the capacitor (CSS) connected from SS to SGND causing the reference voltage to ramp up slowly. When VSS reaches 1.23V the output becomes fully active. Set the soft-start time (tSS) using the following equation:SS1.23VC
15µA×
where tSS is in seconds and CSS is in Farads.
Internal Charge Pump (MAX5082)
The MAX5082 features an internal charge pump to enhance the turn-on of the internal MOSFET, allowing for operation with input voltages down to 4.5V. Connect a flying capacitor (CF) between C+ and C-, a boost diode from C+ to BST, as well as a bootstrap capacitor (CBST) between BST and LX to provide the gate-drive voltage for the high-side n-channel DMOS switch. During the on-time, the flying capacitor is charged to VDVREG. During the off-time, the positive terminal of the flying capacitor (C+) is pumped to two times VDVREG and charge is dumped onto CBST to provide twice the regulator voltage across the high-side DMOS driver. Use a ceramic capaci-tor of at least 0.1μF for CBST and CF located as close to
the device as possible.
Figure 2. MAX5083 Simplified Block Diagram
1.23V
1.23V
ON/OFF
LDO
REG
THERMAL
SHDNREF
0.3V
CLKILIM
1.23V
REGOK
VREF
VREF
ISS
>1.23V ON
<1.11V OFF
COMP
SYNC
E/ASSA
CPWM
RAMP
LOGIC
OSC
BOOTSTRAP
CONTROL
PCLK
BST
SGND
DVREG
PGND
SCLK
HIGH-SIDE
CURRENT
SENSEREF_PFM
PFM
REF_ILIM
ILIM
OVERL
CLK
ILIMOVERLOAD
MANAGEMENT
MAX5083
MAX5082/MAX50831.5A, 40V, MAXPower Step-Down
DC-DC Converters

Partno	Mfg	Dc	Qty	Available	Descript
MAX5083ATE	MAXIM	N/a	2	avai	1.5A, 40V, MAXPower Step-Down DC-DC Converters