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MAX8654ETX+T

hot MAX8654ETX+T

MAX8654ETX+T

For Reference Only

Part Number MAX8654ETX+T
Manufacturer Maxim Integrated
Description IC REG BUCK ADJ 8A 36TQFN
Datasheet MAX8654ETX+T Datasheet
Package 36-WFQFN Exposed Pad
In Stock 4924 piece(s)
Unit Price $ 8.1274 *
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MAX8654ETX+T

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MAX8654ETX+T Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - PMIC - Voltage Regulators - DC DC Switching Regulators
Datasheet MAX8654ETX+T Datasheet
Package36-WFQFN Exposed Pad
Series-
FunctionStep-Down
Output ConfigurationPositive
TopologyBuck
Output TypeAdjustable
Number of Outputs1
Voltage - Input (Min)4.5V
Voltage - Input (Max)14V
Voltage - Output (Min/Fixed)0.6V
Voltage - Output (Max)11.9V
Current - Output8A
Frequency - Switching250kHz ~ 1.2MHz
Synchronous RectifierNo
Operating Temperature-40°C ~ 85°C (TA)
Mounting TypeSurface Mount
Package / Case36-WFQFN Exposed Pad
Supplier Device Package36-TQFN (6x6)

MAX8654ETX+T Datasheet

Page 1

Page 2

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 Features  Internal 26mΩ RDS(ON) MOSFETs  Guaranteed 8A Output Current  Adjustable Overcurrent Protection  1% Output Accuracy Over Temperature  Operates from 4.5V to 14V Supply  Adjustable Output from 0.6V to 0.85 x VIN  Soft-Start Reduces Inrush Supply Current  250kHz to 1.2MHz Adjustable Switching or SYNC Input  Compatible with Ceramic, Polymer, and Electrolytic Output Capacitors  SYNCOUT Synchronizes 2nd Regulator 180° Out-of-Phase  36-Pin, Lead-Free, 6mm x 6mm TQFN Package M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator ________________________________________________________________ Maxim Integrated Products 1 Ordering Information MAX8654 IN VP BST VDL INPUT 4.5V TO 14V OUTPUT UP TO 8A LX EN PGND COMP FB SYNC SYNCOUT PWRGD GND VL VL ILIM REFIN SS FREQ IN VL Typical Operating Circuit 19-0588; Rev 3; 6/11 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Pin Configuration appears at end of data sheet. EVALU ATION KIT AVAIL ABLE PART TEMP RANGE PIN- PACKAGE MAX8654ETX+ -40°C to +85°C 36 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.

Page 3

M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator 2 _______________________________________________________________________________________ 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. PARAMETER CONDITIONS MIN TYP MAX UNITS IN/VP IN and VP Voltage Range 4.5 14 V VDL Voltage Range VP = VDL 4.5 5.5 V VL Output Voltage IVL = 5mA 3.3 V VDL Output Voltage IVDL = 50mA 5 V Not switching, no load 2.7 VIN = 12V 45IN + VP Supply Current fS = 500kHz, no load, L = 1.5µH VIN = 4.5V 28 mA VL Supply Current fS = 500kHz, VVL = 3.8V from separate supply 1.6 mA VDL Supply Current fS = 500kHz, VVDL = 5.5V from separate supply 25 mA IN + VP Shutdown Current VP = VIN = 13.2V, VEN = VVDL = VVL = unconnected 10 20 µA VVL rising 3 3.1VL Undervoltage Lockout Threshold LX starts/stops switching, 2µs rising/falling edge deglitch VVL falling 2.8 2.9 V VIN rising 4.4VDL and IN Undervoltage Lockout Threshold LX starts/stops switching, 3µs rising/falling edge deglitch VIN falling 3.8 V BST BST Shutdown Supply Current VEN = 0V, VIN = VVP = VBST = VVDL = 5V 10 µA PWM COMPARATOR PWM Comparator Propagation Delay 5mV overdrive 16 ns COMP COMP Clamp Voltage, High 1.8 V COMP Slew Rate 7 V/µs COMP Shutdown Resistance From COMP to GND, VEN = 0V 7 Ω

Page 4

M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator _______________________________________________________________________________________ 3 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.) PARAMETER CONDITIONS MIN TYP MAX UNITS ERROR AMPLIFIER FB Regulation Voltage VP = VIN = 4.5V to 14V 0.594 0.6 0.606 V Open-Loop Voltage Gain 1kΩ from COMP to GND 95 dB Error-Amplifier Unity-Gain Bandwidth Parallel 10kΩ, 160pF from COMP to GND 20 MHz Error-Amplifier Common-Mode Input Range 0 1.5 V Error-Amplifier Maximum Output Current VCOMP = 1V 1 mA FB Input Bias Current VFB = 0.6V -35 nA REFIN REFIN Input Bias Current VREFIN = 0.6V -60 nA REFIN Common-Mode Range 0 1.5 V LX (All Pins Combined) LX On-Resistance, High Side ILX = -180mA VBST - VLX = 5V 36 64 mΩ LX On-Resistance, Low Side ILX = 180mA 25 40 mΩ Sourcing 7 8 10 LX Current-Limit Threshold RILIM = 100kΩ Sinking 7 8 10 A RILIM Range 40 200 kΩ VLX = 14V = VIN +50 LX Leakage Current VEN = 0V VLX = 0V, VIN = 14V -50 µA RFREQ = 50kΩ 0.85 1 1.1 LX Switching Frequency RFREQ = 100kΩ 0.45 0.5 0.55 MHz RFREQ Range 50 200 kΩ LX Minimum On-Time 80 ns M axi m um RM S LX Outp ut C ur r ent (Note 2) 10.5 A EN/SS EN Input Logic-Low Threshold 0.6 V EN Input Logic-High Threshold 1.2 V VEN = 0V -1 EN Input Current VEN = 14V 7 µA SS Current VSS = 0.45V -10 -8 -6 µA REFIN Discharge Resistance 500 Ω Current-Limit Startup Blanking 110 Clock cycles Restart Time 900 Clock cycles

Page 5

M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator 4 _______________________________________________________________________________________ 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.) PARAMETER CONDITIONS MIN TYP MAX UNITS SYNC SYNC Capture Range 0.25 1.20 MHz tLO 100 SYNC Pulse Width tHI 100 ns VIL 0.4 SYNC Input Threshold VIH 1.6 V IIL 10 nA SYNC Input Current VSYNC = 0V or 3.6V IIH 7 µA SYNCOUT SYNCOUT Frequency Range 0.25 1.2 MHz SYNCOUT Phase Shift from SYNCIN or Internal Oscillator Frequency = 1MHz 170 180 190 Degrees VOH VVL - 0.4 SYNCOUT Output Voltage ISYNCOUT = ±1mA VOL 0.2 V THERMAL SHUTDOWN Thermal-Shutdown Threshold When LX stops switching +165 °C Thermal-Shutdown Hysteresis 20 °C POWER-GOOD PWRGD Threshold Voltage VFB falling, 30mV hysteresis, VREFIN > 540mV 90 % of REFIN PWRGD Falling Edge Deglitch 48 Clock cycles PWRGD Output Voltage Low IPWRGD = 4mA 0.03 0.06 V PWRGD Leakage Current VPWRGD = 5.5V, VFB = 0.9V 0.01 1 µA Note 2: All devices are production tested at TA = +25°C. Limits over the operating range are guaranteed by design.

Page 6

M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator _______________________________________________________________________________________ 5 EFFICIENCY vs. LOAD CURRENT M A X 8 6 5 4 t o c0 1 OUTPUT CURRENT (A) EF FI C IE N C Y ( % ) 1 10 20 30 40 50 60 70 80 90 100 0 0.1 10 VIN = 12V, VVDL = VVP = 5V, fS = 500kHz VOUT = 1.8V VOUT = 3.3V VOUT = 5V EFFICIENCY vs. LOAD CURRENT M A X 8 6 5 4 t o c0 2 OUTPUT CURRENT (A) EF FI C IE N C Y ( % ) 1 10 20 30 40 50 60 70 80 90 100 0 0.1 10 VIN = VVP = 5V, fS = 500kHz VOUT = 1.8V VOUT = 3.3V EFFICIENCY vs. LOAD CURRENT M A X 8 6 5 4 t o c0 3 OUTPUT CURRENT (A) EF FI C IE N C Y ( % ) 1 10 20 30 40 50 60 70 80 90 100 0 0.1 10 VIN = VVP = 12V, fS = 500kHz VOUT = 1.8V VOUT = 3.3V VOUT = 5V REFERENCE VOLTAGE vs. TEMPERATURE M A X 8 6 5 4 t o c0 4 TEMPERATURE (°C) R EF ER EN C E V O LT A G E (V ) 0.595 0.600 0.605 0.610 0.590 -50 -25 0 25 50 75 100 125 SWITCHING FREQUENCY vs. INPUT VOLTAGE M A X 8 6 5 4 t o c0 5 INPUT VOLTAGE (V) S W IT C H IN G F R EQ U EN C Y ( kH z) 200 600 400 1000 800 1200 0 5 7 9 11 13 15 SWITCHING FREQUENCY vs. RFREQ M A X 8 6 5 4 t o c0 6 RFREQ (kΩ) S W IT C H IN G F R EQ U EN C Y ( kH z) 200 800 600 400 1200 1000 1400 0 0 50 100 150 200 250 LOAD REGULATION M A X 8 6 5 4 t o c0 7 LOAD CURRENT (A) O U TP U T V O LT A G E C H A N G E (% ) -0.30 -0.15 -0.20 -0.25 -0.05 -0.10 0 -0.35 0 1 2 3 4 5 6 7 8 VOUT = 1.8V VOUT = 3.3V SHUTDOWN SUPPLY CURRENT vs. INPUT VOLTAGE M A X 8 6 5 4 t o c0 8 INPUT VOLTAGE (V) S H U TD O W N S U P P LY C U R R EN T (µ A ) 1 6 5 4 3 2 9 8 7 10 0 0 2 4 6 8 10 12 14 CURRENT LIMIT vs. OUTPUT VOLTAGE M A X 8 6 5 4 t o c0 9 OUTPUT VOLTAGE (V) C U R R EN T LI M IT ( A ) 7.2 8.2 8.0 7.8 7.6 7.4 8.8 8.6 8.4 9.0 7.0 1.5 .2.0 2.5 3.0 3.5 Typical Operating Characteristics (Typical values are: VIN = VVP = 12V, VOUT = 3.3V, RFREQ = 100kΩ, and TA = +25°C, circuit of Figure 1.)

Page 7

Typical Operating Characteristics (continued) (Typical values are: VIN = VVP = 12V, VOUT = 3.3V, RFREQ = 100kΩ, and TA = +25°C, circuit of Figure 1.) M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator 6 _______________________________________________________________________________________ EXPOSED PAD TEMPERATURE vs. LOAD CURRENT M A X 8 6 5 4 t o c1 0 LOAD CURRENT (A) EX P O S ED P A D T EM P ER A TU R E (° C ) -40 60 40 20 0 -20 120 100 80 140 -60 0 2 4 6 8 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 M A X 8 6 5 4 t o c1 1 INPUT VOLTAGE (V) O U TP U T V O LT A G E C H A N G E (% ) -0.3 -0.1 -0.2 0.1 0 0.2 -0.4 5 7 9 11 13 15 ILOAD = 6A ILOAD = 0A ILOAD = 3A SHORT-CIRCUIT RESPONSE MAX8654 toc12 400µs/div IOUT VOUT IIN 5A/div 2V/div 0V 0 1A/div 0 CSS = 1000pF RMS INPUT CURRENT DURING OUTPUT SHORT CIRCUIT M A X 8 6 5 4 t o c1 3 INPUT VOLTAGE (V) R M S IN P U T C U R R EN T (A ) 0.05 0.30 0.25 0.20 0.15 0.10 0.45 0.40 0.35 0.50 0 5 7 9 11 13 VOUT = 3.3V CSS = 1000pF CSS = 22,000pF CSS = 10,000pF RMS OUTPUT CURRENT DURING OUTPUT SHORT CIRCUIT M A X 8 6 5 4 t o c1 4 INPUT VOLTAGE (V) R M S O U TP U T C U R R EN T (A ) 2.5 2.0 1.5 3.5 3.0 4.0 1.0 5 7 9 11 13 VOUT = 3.3V CSS = 1000pF CSS = 22,000pF CSS = 10,000pF OPEN-LOOP FREQUENCY RESPONSE M A X 8 6 5 4 t o c1 5 FREQUENCY (kHz) IOUT = 6A 106.57946kHz CPI 106.57946kHz CPI P H A S E (D EG ) G A IN ( dB ) -20 0 0 20 40 -40 1010.1 1000100 -83.3 83.3 166.6 -166.6 1010.1 1000100

Page 8

LOAD TRANSIENT MAX8654 toc16 20µs/div IOUT VOUT 2A/div 100mV/div AC-COUPLED 0A SOFT-START TIME vs. CSS M A X 8 6 5 4 t o c1 7 CSS (µF) S O FT -S TA R T TI M E (m s) 1 6 5 4 3 2 9 8 7 10 0 0 0.025 0.050 0.075 0.100 0.125 0.150 STARTUP INTO A 0.5Ω LOAD MAX8654 toc18 200µs/div IIN VEN VOUT VPWRGD 2A/div 10V/div 0V 0 2V/div 0V 2V/div 0V M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator _______________________________________________________________________________________ 7 SOFT-START WITH REFIN INTO A 0.5Ω LOAD MAX8654 toc19 40µs/div IIN VREFIN VOUT VPWRGD 2A/div 500mV/div 0V 0 2V/div 0V 2V/div 0V SYNCHRONIZED OPERATION (NO LOAD) MAX8654 toc20 400ns/div VLX2 VLX1 ILX1 ILX2 10V/div 10mV/div 0V 0V 2A/div 2A/div Typical Operating Characteristics (continued) (Typical values are: VIN = VVP = 12V, VOUT = 3.3V, RFREQ = 100kΩ, and TA = +25°C, circuit of Figure 1.)

Page 9

M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator 8 _______________________________________________________________________________________ Pin Description PIN NAME FUNCTION 1, 2, 3, 34, 35, 36 PGND Power Ground. All PGND pins are internally connected. Connect all PGND pins externally to the power ground plane. 4 VDL 5V 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. 5–8 IN Power-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. 9 VP Input 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. 10 VL 3.3V LDO for Internal Chip Supply. Bypass with a 1µF ceramic capacitor to GND. 11 ILIM Current-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. 12 FREQ Oscillator 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, 32 GND Analog Circuit Ground 14 REFIN 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. 15 SS Soft-Start Input. Connect a capacitor from SS to GND to set the startup time. See the Soft-Start and REFIN section for details. 16 COMP Regulator Compensation. Connect the necessary compensation network from COMP to FB. COMP is internally pulled to GND when the IC is in shutdown mode. 17 FB Feedback 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. 18 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. 19 SYNCOUT Oscillator 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. 20 SYNC Synchronization Input. Synchronize to an external clock with a frequency of 250kHz to 1.2MHz. Connect SYNC to GND to disable the synchronization function. 21 BST High-Side MOSFET Driver Supply. Bypass BST to LX with a 0.22µF ceramic capacitor. 22–29 LX Inductor 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, 33 N.C. Not Internally Connected 31 EN Enable 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. — EP Exposed Pad. Connect to a large PGND ground plane to optimize thermal performance. EP is internally connected to GND and PGND.

Page 10

M A X 8 6 5 4 12V, 8A 1.2MHz Step-Down Regulator _______________________________________________________________________________________ 9 EN VL CONTROL LOGIC BST VP ILIM FREQ SYNC PWRGD GND IN COMP PWM COMPARATOR SS FB REFIN PGND VDL MAX8654 SYNCOUT OSCILLATOR ERROR AMPLIFIER 0.54V REFIN 90% REFIN FB SHUTDOWN CONTROL UVLO CIRCUITRY THERMAL SHUTDOWN BIAS GENERATOR VL REG VDL REG ILIM THRESHOLD VOLTAGE REFERENCE SOFT-START COMP LOW DETECTOR LX LX LX CURRENT-LIMIT COMPARATOR BST CAPACITOR CHARGING SWITCH SHDN 1VP-P Block Diagram

MAX8654ETX+T Reviews

Average User Rating
5 / 5 (120)
★ ★ ★ ★ ★
5 ★
108
4 ★
12
3 ★
0
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0

Rube*****iffin

February 2, 2020

Works great with an older drive in a newer computer.have not encountered any problems, Glad somebody is making these for all the older equipment.

Khal*****llis

December 19, 2019

The products are good, the amount is correct. The values are correct.

Aya *****astava

November 22, 2019

Good and works well. What else is there to say about it.

Cars*****osales

November 19, 2019

Nice to have an assortment on hand, just in case. Happy with this purchase.

Dalt*****eller

October 13, 2019

Good quality, buy back and then use, with the newly bought hard disk, very stable, at any time you can check things, not occupy space, very convenient.

Cata***** Ramos

October 4, 2019

Worked perfectly for my application. Worked like a charm!

Toby*****tura

August 28, 2019

Perfectly satisfied with item. Top supplier on my list.

Stev*****iley

August 23, 2019

So far so good. I need to see how they hold up.

Bele*****glish

August 23, 2019

very pleased with item, thank you.

Kayli*****ckson

August 13, 2019

The order has arrived ahead of time, we appreciate it very much!! Thanks

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