MAX8654ETX+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX8654ETX+T
12V, 8A, 1.2MHz, Step-Down Regulator
General Description
The MAX8654 high-efficiency switching regulator delivers
up to 8A of load current at output voltages from 0.6V to
0.85 x VIN. The IC operates from 4.5V to 14V, making it
ideal for on-board point-of-load and postregulation appli-
cations, with total output error less than ±1% over load,
line, and temperature ranges.
The MAX8654 is a fixed-frequency PWM mode regulator
with a switching frequency range of 250kHz to 1.2MHz
set by an external resistor or SYNC input. High-frequency
operation allows for an all-ceramic-capacitor solution. A
SYNCOUT output is provided to synchronize a second
regulator switching 180°out-of-phase with the first to
reduce the input ripple current and consequently reduce
the required input capacitance. The high operating fre-
quency minimizes the size of external components.
The on-board low RDS(ON)dual-nMOS design keeps
the board cooler at heavy loads while minimizing the
critical inductances, making the layout a much simpler
task with respect to the discrete solutions.
The MAX8654 comes with a high-bandwidth (20MHz)
voltage-error amplifier. The voltage-mode control archi-
tecture and the op-amp voltage-error amplifier permit a
type 3 compensation scheme to be utilized to achieve
maximum loop bandwidth, up to 20% of the switching
frequency. High loop bandwidth achieves fast transient
response resulting in less output capacitance required.
The MAX8654 offers programmable soft-start to accom-
modate different types of output capacitors and reduce
input inrush current. The MAX8654 is available in a 36-
lead TQFN package.
Applications
FeaturesInternal 26mΩRDS(ON)MOSFETsGuaranteed 8A Output CurrentAdjustable Overcurrent Protection1% Output Accuracy Over TemperatureOperates from 4.5V to 14V SupplyAdjustable Output from 0.6V to 0.85 x VINSoft-Start Reduces Inrush Supply Current250kHz to 1.2MHz Adjustable Switching or SYNC
InputCompatible with Ceramic, Polymer, and
Electrolytic Output CapacitorsSYNCOUT Synchronizes 2nd Regulator 180°
Out-of-Phase36-Pin, Lead-Free, 6mm x 6mm TQFN Package
12V, 8A 1.2MHz
Step-Down Regulator
Ordering Information
MAX8654
BST
VDL
INPUT
4.5V TO 14V
OUTPUT
UP TO 8A
PGND
COMP
SYNC
SYNCOUT
PWRGD
GND
ILIM
REFIN
FREQ
Typical Operating Circuit
19-0588; Rev 3; 6/11
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-
PACKAGE
MAX8654ETX+-40°C to +85°C36 TQFN-EP*
POL Power Supplies
Servers
DDR Memory
RAID Power Supplies
Network Power Supplies
Graphic Cards
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
MAX8654
12V, 8A 1.2MHz
Step-Down Regulator
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= VEN= VVP= 12V, VVDL= 5V, VVL= 3.3V, VSYNC= 0V, VFB= 0.5V, TA= -40°C to +85°C, typical values are at TA= +25°C,
unless otherwise noted.)
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.
SYNC, VL, PWRGD to GND...................................-0.3V to +4.5V
SYNCOUT, COMP, SS, FB,
REFIN, ILIM, FREQ to GND.....................-0.3V to (VVL + 0.3V)
VDL to PGND............................................................-0.3V to +6V
VP, IN, EN to GND..................................................-0.3V to +16V
LX Current (Note 1: -12A to +12A)
BST to LX.………………………………………………-0.3V to +6V
BST to GND……………………………………..-0.3V to (VIN+ 6V)
EN to VP and IN………………………………-0.3V to (VIN+ 0.3V)
PGND to GND.......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA= +70°C)
36-Pin TQFN (derate 35.7mW/°C above +70°C).........2857.1mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......………………………………….+150°C
Storage Temperature Range.............................-65°C to +150°C
Thermal Resistance Junction to Exposed Pad (EP)...........3°C/W
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
Note 1:LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power-dissipation limits.
PARAMETERCONDITIONSMINTYPMAXUNITS
IN/VP
IN and VP Voltage Range4.514V
VDL Voltage RangeVP = VDL4.55.5V
VL Output VoltageIVL = 5mA3.3V
VDL Output VoltageIVDL = 50mA5V
Not switching, no load2.7
VIN = 12V45IN + VP Supply CurrentfS = 500kHz, no load,
L = 1.5µHVIN = 4.5V28
VL Supply CurrentfS = 500kHz, VVL = 3.8V from separate supply1.6mA
VDL Supply CurrentfS = 500kHz, VVDL = 5.5V from separate supply25mA
IN + VP Shutdown CurrentVP = VIN = 13.2V, VEN = VVDL = VVL = unconnected1020µA
VVL rising33.1VL Undervoltage Lockout
Threshold
LX starts/stops switching,
2µs rising/falling edge deglitchVVL falling2.82.9V
VIN rising4.4VDL and IN Undervoltage
Lockout Threshold
LX starts/stops switching,
3µs rising/falling edge deglitchVIN falling3.8V
BST
BST Shutdown Supply CurrentVEN = 0V, VIN = VVP = VBST = VVDL = 5V10µA
PWM COMPARATOR
PWM Comparator Propagation
Delay5mV overdrive16ns
COMP
COMP Clamp Voltage, High1.8V
COMP Slew Rate7V/µs
COMP Shutdown ResistanceFrom COMP to GND, VEN = 0V7Ω
12V, 8A 1.2MHz
Step-Down Regulator
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VEN= VVP= 12V, VVDL= 5V, VVL= 3.3V, VSYNC= 0V, VFB= 0.5V, TA= -40°C to +85°C, typical values are at TA= +25°C,
unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
ERROR AMPLIFIER
FB Regulation VoltageVP = VIN = 4.5V to 14V0.5940.60.606V
Open-Loop Voltage Gain1kΩ from COMP to GND95dB
Error-Amplifier Unity-Gain
BandwidthParallel 10kΩ, 160pF from COMP to GND20MHz
Error-Amplifier Common-Mode
Input Range01.5V
Error-Amplifier Maximum Output
CurrentVCOMP = 1V1mA
FB Input Bias CurrentVFB = 0.6V-35nA
REFIN
REFIN Input Bias CurrentVREFIN = 0.6V-60nA
REFIN Common-Mode Range01.5V
LX (All Pins Combined)
LX On-Resistance, High SideILX = -180mAVBST - VLX = 5V3664mΩ
LX On-Resistance, Low SideILX = 180mA2540mΩ
Sourcing7810LX Current-Limit ThresholdRILIM = 100kΩSinking7810A
RILIM Range40200kΩ
VLX = 14V = VIN+50LX Leakage CurrentVEN = 0VVLX = 0V, VIN = 14V-50µA
RFREQ = 50kΩ0.8511.1LX Switching FrequencyRFREQ = 100kΩ0.450.50.55MHz
RFREQ Range50200kΩ
LX Minimum On-Time80nsaxi m um RM S LX Outp ut C ur r ent(Note 2)10.5A
EN/SS
EN Input Logic-Low Threshold0.6V
EN Input Logic-High Threshold1.2V
VEN = 0V-1EN Input CurrentVEN = 14V7µA
SS CurrentVSS = 0.45V-10-8-6µA
REFIN Discharge Resistance500Ω
Current-Limit Startup Blanking110Clock
cycles
Restart Time900Clock
cycles
MAX8654
12V, 8A 1.2MHz
Step-Down Regulator
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VEN= VVP= 12V, VVDL= 5V, VVL= 3.3V, VSYNC= 0V, VFB= 0.5V, TA= -40°C to +85°C, typical values are at TA= +25°C,
unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITS
SYNC
SYNC Capture Range0.251.20MHz
tLO100SYNC Pulse WidthtHI100ns
VIL0.4SYNC Input ThresholdVIH1.6V
IIL10nASYNC Input CurrentVSYNC = 0V or 3.6VIIH7µA
SYNCOUT
SYNCOUT Frequency Range0.251.2MHz
SYNCOUT Phase Shift from
SYNCIN or Internal OscillatorFrequency = 1MHz170180190Degrees
VOHVVL - 0.4SYNCOUT Output VoltageISYNCOUT = ±1mAVOL0.2V
THERMAL SHUTDOWN
Thermal-Shutdown ThresholdWhen LX stops switching+165°C
Thermal-Shutdown Hysteresis20°C
POWER-GOOD
PWRGD Threshold VoltageVFB falling, 30mV hysteresis, VREFIN > 540mV90% of
REFIN
PWRGD Falling Edge Deglitch48Clock
cycles
PWRGD Output Voltage LowIPWRGD = 4mA0.030.06V
PWRGD Leakage CurrentVPWRGD = 5.5V, VFB = 0.9V0.011µA
Note 2:All devices are production tested at TA= +25°C. Limits over the operating range are guaranteed by design.
12V, 8A 1.2MHz
Step-Down Regulator
EFFICIENCY vs. LOAD CURRENT
MAX8654 toc01
OUTPUT CURRENT (A)
EFFICIENCY (%)
VIN = 12V, VVDL = VVP = 5V, fS = 500kHz
VOUT = 1.8V
VOUT = 3.3V
VOUT = 5V
EFFICIENCY vs. LOAD CURRENT
MAX8654 toc02
OUTPUT CURRENT (A)
EFFICIENCY (%)
VIN = VVP = 5V, fS = 500kHz
VOUT = 1.8VVOUT = 3.3V
EFFICIENCY vs. LOAD CURRENT
OUTPUT CURRENT (A)
EFFICIENCY (%)
VIN = VVP = 12V, fS = 500kHz
VOUT = 1.8V
VOUT = 3.3V
VOUT = 5V
REFERENCE VOLTAGE vs. TEMPERATURE
MAX8654 toc04
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)0.595
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX8654 toc05
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
SWITCHING FREQUENCY vs. RFREQ
MAX8654 toc06
RFREQ (kΩ)
SWITCHING FREQUENCY (kHz)
LOAD REGULATION
MAX8654 toc07
OUTPUT VOLTAGE CHANGE (%)
VOUT = 1.8V
VOUT = 3.3V
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8654 toc08
SHUTDOWN SUPPLY CURRENT (468101214
CURRENT LIMIT vs. OUTPUT VOLTAGE
MAX8654 toc09
CURRENT LIMIT (A)
Typical Operating Characteristics
(Typical values are: VIN= VVP= 12V, VOUT= 3.3V, RFREQ= 100kΩ, and TA= +25°C, circuit of Figure 1.)
ypical Operating Characteristics (continued)(Typical values are: VIN= VVP= 12V, VOUT= 3.3V, RFREQ= 100kΩ, and TA= +25°C, circuit of Figure 1.)
MAX8654
12V, 8A 1.2MHz
Step-Down Regulator
EXPOSED PAD TEMPERATURE
vs. LOAD CURRENT
MAX8654 toc10
LOAD CURRENT (A)
EXPOSED PAD TEMPERATURE (
TA = +85°C, NO AIR FLOW
TA = +25°C, NO AIR FLOW
TA = -40°C, NO AIR FLOW
TA = -40°C, 200LFM
TA = +25°C, 200LFM
TA = +85°C, 200LFM
LINE REGULATION
MAX8654 toc11
INPUT VOLTAGE (V)
OUTPUT VOLTAGE CHANGE (%)-0.3
ILOAD = 6A
ILOAD = 0AILOAD = 3A
SHORT-CIRCUIT RESPONSE
MAX8654 toc12
400μs/div
IOUT
VOUT
IIN
5A/div
2V/div
1A/div
CSS = 1000pF
RMS INPUT CURRENT DURING
OUTPUT SHORT CIRCUIT
MAX8654 toc13
INPUT VOLTAGE (V)
RMS INPUT CURRENT (A)
VOUT = 3.3V
CSS = 1000pF
CSS = 22,000pF
CSS = 10,000pF
RMS OUTPUT CURRENT DURING
OUTPUT SHORT CIRCUIT
MAX8654 toc14
RMS OUTPUT CURRENT (A)
VOUT = 3.3V
CSS = 1000pF
CSS = 22,000pF
CSS = 10,000pF
OPEN-LOOP FREQUENCY RESPONSE
MAX8654 toc15
IOUT = 6A
106.57946kHz
CPI
106.57946kHz
CPI
PHASE (DEG)
GAIN (dB)-20
-166.610.11000100
LOAD TRANSIENT
MAX8654 toc16
20μs/div
IOUT
VOUT
2A/div
100mV/div
AC-COUPLED
SOFT-START TIME
vs. CSS
MAX8654 toc17
CSS (μF)
SOFT-START TIME (ms)0.0250.0500.0750.1000.1250.150
STARTUP INTO A 0.5Ω LOAD
MAX8654 toc18
200μs/div
IIN
VEN
VOUT
VPWRGD
2A/div
10V/div
2V/div
2V/div
12V, 8A 1.2MHz
Step-Down Regulator
SOFT-START WITH REFIN
INTO A 0.5Ω LOAD
MAX8654 toc19
40μs/div
IIN
VREFIN
VOUT
VPWRGD
2A/div
500mV/div
2V/div
2V/div
SYNCHRONIZED OPERATION (NO LOAD)
MAX8654 toc20
400ns/div
VLX2
VLX1
ILX1
ILX2
10V/div
10mV/div
2A/div
2A/divypical Operating Characteristics (continued)
(Typical values are: VIN= VVP= 12V, VOUT= 3.3V, RFREQ= 100kΩ, and TA= +25°C, circuit of Figure 1.)
MAX8654
12V, 8A 1.2MHz
Step-Down Regulator
Pin Description
PINNAMEFUNCTION
1, 2, 3, 34,
35, 36PGNDPower Ground. All PGND pins are internally connected. Connect all PGND pins externally to the power
ground plane.VDL5V LDO Output. VDL supplies the gate-drive current to the internal MOSFETS, and charges the BST
capacitor. VDL requires at least a 2.2µF ceramic bypass capacitor to PGND.
5–8INPower-Supply Input. Input supply range is from 4.5V to 14V. Bypass with two 10µF and a 0.1µF ceramic
capacitors to PGND. See Figure 1.
9VPInput of the Internal 5V LDO Regulator. Connect to IN if a 5V supply is not available. Connect to an external
5V supply to disable the internal 5V regulator.VL3.3V LDO for Internal Chip Supply. Bypass with a 1µF ceramic capacitor to GND.ILIMCurrent-Limit Adjust. Connect a resistor, RILIM, from ILIM to GND. IILIM = 1V / RILIM. IILIM determines the
LX current-limit trip point. See the Current Limit section for more details.FREQOscillator Frequency Selection. Connect a resistor from FREQ to GND to set the internal oscillator
frequency. See the Frequency Select (FREQ) section for more details.
13, 32GNDAnalog Circuit GroundREFIN
External Reference Input. Connect to an external reference. FB regulates to the voltage applied to REFIN.
Connect REFIN to SS to use the internal 0.6V reference. REFIN is internally pulled to GND when the IC is in
shutdown mode.SSSoft-Start Input. Connect a capacitor from SS to GND to set the startup time. See the Soft-Start and REFIN
section for details.COMPRegulator Compensation. Connect the necessary compensation network from COMP to FB. COMP is
internally pulled to GND when the IC is in shutdown mode.FBFeedback Input. Connect to the center tap of an external resistor-divider from the output to GND to set the
output voltage. See the Compensation Design section for more details.PWRGD
Power-Good Output. Open-drain output that is high impedance when VFB ≥ 90% of VREFIN and VREFIN >
540mV. PWRGD is internally pulled low when the IC is in shutdown mode, or when VVDL, VIN, or VVL is
below the UVLO threshold, or the IC is in thermal shutdown.SYNCOUTOscillator Output. The SYNCOUT output is 180° out-of-phase from the internal oscillator to facilitate running
a second regulator out-of-phase to reduce input ripple.SYNCSynchronization Input. Synchronize to an external clock with a frequency of 250kHz to 1.2MHz. Connect
SYNC to GND to disable the synchronization function.BSTHigh-Side MOSFET Driver Supply. Bypass BST to LX with a 0.22µF ceramic capacitor.
22–29LXInductor Connection. All LX pins are internally connected together. Connect all LX pins to the switched
side of the inductor. LX is high impedance when the IC is in shutdown mode.
30, 33N.C.Not Internally ConnectedENEnable Input. Logic input to enable/disable the MAX8654. Drive EN high to enable the IC. Drive EN low to
place the IC in a low-power shutdown mode.
—EPExposed Pad. Connect to a large PGND ground plane to optimize thermal performance. EP is internally
connected to GND and PGND.
12V, 8A 1.2MHz
Step-Down Regulator
CONTROL
LOGIC
BST
ILIM
FREQ
SYNC
PWRGD
GND
COMP
PWM
COMPARATOR
REFINPGND
VDL
MAX8654
SYNCOUT
OSCILLATOR
ERROR
AMPLIFIER
0.54V
REFIN
90% REFIN
SHUTDOWN
CONTROL
UVLO
CIRCUITRY
THERMAL
SHUTDOWN
BIAS
GENERATOR
REG
VDL
REG
ILIM
THRESHOLD
VOLTAGE
REFERENCE
SOFT-START
COMP LOW
DETECTOR
CURRENT-LIMIT
COMPARATOR
BST CAPACITOR
CHARGING SWITCH
SHDN
1VP-P
Block Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX8654ETX+T	N/A	N/a	2500	avai	12V, 8A, 1.2MHz, Step-Down Regulator