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MAX17502 60V, 1A, Ultra-Small, High-Efficiency,

Synchronous Step-Down DC-DC Converter

General Description

The MAX17502 high-efficiency, high-voltage, synchro nous

step-down DC-DC converter with integrated MOSFETs

operates over a 4.5V to 60V input voltage range. This

device is offered in a fixed 3.3V , 5V or adjustable output

voltage (0.9V to 92%V

) while delivering up to 1A of

current. The output voltage is accurate to within ±1.7%

over -40°C to +125°C. The MAX17502 is available in

compact TDFN and TSSOP packages. Simulation models

are available.

The device features peak-current-mode control with

pulse-width modulation (PWM) and operates with fixed

switching frequency at any load. The low-resistance,

on-chip MOSFETs ensure high efficiency at full load and

simplify the layout.

A programmable soft-start feature allows users to reduce

input inrush current. The device also incorporates an

output enable/undervoltage lockout pin (EN/UVLO) that

allows the user to turn on the part at the desired input-

voltage level. An open-drain RESET pin provides a

delayed power-good signal to the system upon achieving

successful regulation of the output voltage.

Applications

● IndustrialProcessControl

● HVACandBuildingControl

● BaseStation,VOIP,Telecom

● HomeTheatre

● Battery-PoweredEquipment

● General-PurposePoint-of-Load

Benets and Features

● EliminatesExternalComponentsandReducesTotal

Cost

• NoSchottky-SynchronousOperationforHigh

EfficiencyandReducedCost

• Internal Compensation and Feedback Divider for

3.3V and 5V Fixed Outputs

• All-Ceramic Capacitors, Ultra-Compact Layout

● ReducesNumberofDC-DCRegulatorstoStock

• Wide4.5Vto60VInputVoltageRange

• 0.9V to 92%V

Adjustable Output Voltage

• Delivers up to 1A

• 600kHzand300kHzSwitchingFrequencyOptions

• Available in a 10-Pin, 3mm x 2mm TDFN and

14-Pin, 5mm x 4.4mm TSSOP Packages

● ReducesPowerDissipation

• Peak Efficiency > 90%

• ShutdownCurrent=0.9μA(typ)

● OperatesReliablyinAdverseIndustrialEnvironments

• Hiccup-ModeCurrentLimit,SinkCurrentLimit,

and Autoretry Startup

• Built-InOutput-VoltageMonitoring(Open-Drain

RESET Pin)

• Resistor-ProgrammableEN/UVLOThreshold

• Adjustable Soft-Start and Prebiased Power-Up

• -40°Cto+125°CIndustrialTemperatureRange

19-6245 Rev 3; 8/14

Ordering Information appears at end of data sheet.

Summary of content (21 pages)

PAGE 1
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter General Description Benefits and Features The device features peak-current-mode control with pulse-width modulation (PWM) and operates with fixed switching frequency at any load. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout. ● Reduces Number of DC-DC Regulators to Stock • Wide 4.5V to 60V Input Voltage Range • 0.
PAGE 2
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Absolute Maximum Ratings VIN to GND.............................................................-0.3V to +70V EN/UVLO to GND.......................................-0.3V to (VIN + 0.3V) LX to PGND................................................-0.3V to (VIN + 0.3V) FB, RESET, COMP, SS to GND..............................-0.3V to +6V VCC to GND..............................................................-0.
PAGE 3
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Electrical Characteristics (continued) (VIN = 24V, VGND = VPGND = 0V, CVIN = 2.2μF, CVCC = 1μF, VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET = unconnected. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 0.55 0.
PAGE 4
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Electrical Characteristics (continued) (VIN = 24V, VGND = VPGND = 0V, CVIN = 2.2μF, CVCC = 1μF, VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET = unconnected. TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.
PAGE 5
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Typical Operating Characteristics (VIN = 24V, VGND = VPGND = 0V, CVIN = 2.2μF, CVCC = 1μF, VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET = unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.
PAGE 6
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Typical Operating Characteristics (continued) (VIN = 24V, VGND = VPGND = 0V, CVIN = 2.2μF, CVCC = 1μF, VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET = unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.) 0.90 1.8 1.7 1.6 0.89 1.5 0.88 -40 -20 0 20 40 60 80 100 120 1.
PAGE 7
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Typical Operating Characteristics (continued) (VIN = 24V, VGND = VPGND = 0V, CVIN = 2.2μF, CVCC = 1μF, VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET = unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.) SOFT-START WITH 2.
PAGE 8
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Typical Operating Characteristics (continued) (VIN = 24V, VGND = VPGND = 0V, CVIN = 2.2μF, CVCC = 1μF, VEN = 1.5V, CSS = 3300pF, VFB = 0.98 x VOUT, LX = unconnected, RESET = unconnected, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to GND, unless otherwise noted.
PAGE 9
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Pin Configurations TOP VIEW TOP VIEW MAX17502 PGND 1 VIN 2 EN/UVLO 3 VCC FB/VO + 4 EP* 5 10 LX 9 GND 8 RESET 7 N.C./COMP 6 SS + PGND 1 14 LX N.C. 2 13 LX VIN 3 12 N.C. EN/UVLO 4 N.C. 5 VCC 6 FB/ VO 7 TDFN (3mm x 2mm) MAX17502 EP* 11 GND 10 RESET 9 N.C./COMP 8 SS TSSOP (5mm x 4.4mm) *EP = EXPOSED PAD.
PAGE 10
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Block Diagram VCC PGND N DRIVER 5µA SS LX MAX17502 HICCUP SS P DRIVER VIN CURRENT SENSE VCC PWM COMPARATOR LDO CLK PWM LOGIC OSC COMP HICCUP SLOPE COMPENSATION START EN RESET LOGIC SS 900mV REFERENCE SWITCHOVER LOGIC RESET COMP N.C./COMP GM FB INTERNAL COMPENSATION (FOR E, F VERSIONS) GND www.maximintegrated.
PAGE 11
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Detailed Description The MAX17502 synchronous step-down regulator operates from 4.5V to 60V and delivers up to 1A load current. Output voltage regulation accuracy meets ±1.7% over temperature. The device uses a peak-current-mode control scheme. An internal transconductance error amplifier generates an integrated error voltage.
PAGE 12
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Prebiased Output When the device starts into a prebiased output, both the high-side and low-side switches are turned off so the converter does not sink current from the output. Highside and low-side switches do not start switching until the PWM comparator commands the first PWM pulse, at which point switching commences first with the high-side switch.
PAGE 13
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Adjusting Output Voltage The MAX17502E and MAX17502F have preset output voltages of 3.3V and 5.0V, respectively. Connect FB/VO directly to the positive terminal of the output capacitor (see the Typical Applications Circuits). The MAX17502G/H offer an adjustable output voltage from 0.9V to 92%VIN.
PAGE 14
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Power Dissipation The exposed pad of the IC should be properly soldered to the PCB to ensure good thermal contact. Ensure the junction temperature of the device does not exceed +125°C under the operating conditions specified for the power supply.
PAGE 15
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter PGND PLANE VOUT PLANE C4 L1 C1 EP VIN PLANE LX PLANE R1 R2 RESET C2 R4 C3 GND PLANE VIAS TO BOTTOM SIDE PGND PLANE VIAS TO BOTTOM SIDE VOUT TRACK VIAS TO BOTTOM SIDE GND PLANE Figure 4. Recommended Component Placement for MAX17502E/F www.maximintegrated.
PAGE 16
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter PGND PLANE VOUT PLANE C4 L1 C1 LX PLANE EP VIN PLANE R1 R2 RESET R3 C2 R4 C3 R5 C9 C5 GND PLANE VIAS TO BOTTOM SIDE PGND PLANE VIAS TO BOTTOM SIDE VOUT TRACK VIAS TO BOTTOM SIDE GND PLANE Figure 5. Recommended Component Placement for MAX17502G www.maximintegrated.
PAGE 17
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter VOUT PLANE PGND PLANE C4 L1 C1 LX PLANE VIN PLANE EP R1 R2 RESET R3 C2 R4 C3 R5 C9 C5 GND PLANE VIAS TO BOTTOM SIDE PGND PLANE VIAS TO BOTTOM SIDE VOUT TRACK VIAS TO BOTTOM SIDE GND PLANE Figure 6. Recommended Component Placement for MAX17502H www.maximintegrated.
PAGE 18
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Typical Applications Circuits VIN 24V C1 2.2µF 1210 LX VIN 1 JU1 2 3 L1 15µH C4 22µF 1210 R1 3.32MΩ EN/UVLO R2 866kΩ C2 1µF C3 3300pF PGND VOUT 3.3V, 1A MAX17502E GND VCC FB/VO SS RESET N.C. RESET Figure 7. MAX17502E Application Circuit (3.3V Output, 1A Maximum Load Current, 600kHz Switching Frequency) VIN 24V C1 2.2µF 1210 LX VIN 1 JU1 2 3 L1 22µH R1 3.
PAGE 19
MAX17502 VIN 24V 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter C1 2.2µF 1210 LX VIN 1 JU1 2 3 EN/UVLO R2 316kΩ C3 6800pF VOUT 12V, 1A C4 10µF 1210 R1 3.32MΩ C2 1µF PGND R4 174kΩ MAX17502G GND VCC FB/VO SS R5 14kΩ COMP C9 12pF L1 47µH RESET RESET R3 20kΩ C5 2200pF Figure 9. MAX17502G Application Circuit (12V Output, 1A Maximum Load Current, 600kHz Switching Frequency) VIN 24V C1 2.2µF 1210 LX VIN 1 JU1 2 3 C4 47µF, 1210 R1 3.
PAGE 20
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Ordering Information/Selector Guide PART PIN-PACKAGE OUTPUT VOLTAGE (V) SWITCHING FREQUENCY (kHz) MODE MAX17502EATB+ 10 TDFN-EP* 3.3 600 PWM MAX17502FATB+ 10 TDFN-EP* 5 600 PWM MAX17502GATB+ 10 TDFN-EP* Adjustable 600 PWM MAX17502HAUD+ 14 TSSOP-EP* Adjustable 300 PWM +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Chip Information PROCESS: BiCMOS www.maximintegrated.
PAGE 21
MAX17502 60V, 1A, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter Revision History REVISION NUMBER REVISION DATE PAGES CHANGED DESCRIPTION 0 5/12 Initial release 1 11/12 Added MAX17502G and MAX17502H to data sheet 1–17 — 2 1/13 Added dotted line for exposed pad in Pin Configuration, and added explanation on detailed condition for RESET 9, 11 3 8/14 Updated General Description, Benefits and Features, Pin Description, and Adjusting Output Voltage sections.