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ISL8502A

2A Synchronous Buck Regulator with Integrated MOSFETs

Renesas Electronics 

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ISL8502A

2A Synchronous Buck Regulator with Integrated MOSFETs

FN7940

Rev 0.00

October 21, 2011

The ISL8502A is a synchronous buck controller with internal

MOSFETs packaged in a small 4mmx4mm QFN package. The

ISL8502A can support a continuous load of 2A and has a very

wide input voltage range. With the switching MOSFETs

integrated into the IC, the complete regulator footprint can be

very small and provide a much more efficient solution than a

linear regulator.

The ISL8502A is capable of stand-alone operation or it can be

used in a master slave combination for multiple outputs that

are derived from the same input rail. Multiple slave channels

(up to six) can be synchronized. This method minimizes the

EMI and beat frequencies effect with multi-channel operation.

The switching PWM controller drives two internal N-Channel

MOSFETs in a synchronous-rectified buck converter topology.

The synchronous buck converter uses voltage-mode control

with fast transient response. The switching regulator provides

a maximum static regulation tolerance of 1% over line, load,

and temperature ranges. The output is user-adjustable by

means of external resistors down to 0.6V.

The output is monitored for undervoltage events. The switching

regulator also has overcurrent protection. Thermal shutdown is

integrated. The ISL8502A features a bi-directional Enable pin

that allows the part to pull the enable pin low during fault

detection.

PGOOD delay for ISL8502A has been decreased to 1ms typical

(at 500kHz switching frequency) compared to 250ms (at

500kHz) for ISL8502.

Features

• Up to 2A Continuous Output Current

• Integrated MOSFETs for Small Regulator Footprint

• Adjustable Switching Frequency, 500kHz to 1.2MHz

• Tight Output Voltage Regulation, 1% Over-temperature

• Wide Input Voltage Range, 5V 10% or 5.5V to 14V

• Wide Output Voltage Range, from 0.6V

• Simple Single-Loop Voltage-Mode PWM Control Design

• Input Voltage Feed-Forward for Constant Modulator Gain

• Fast PWM Converter Transient Response

• Lossless rDS(ON) High Side and Low Side Overcurrent

Protections

• Undervoltage Detection

• Integrated Thermal Shutdown Protection

• Power-Good Indication

• Adjustable Soft-Start

• Start-Up with Pre-Bias Output

• Pb-free (RoHS Compliant)

Applications

• Point of Load Applications

• Graphics Cards - GPU and Memory Supplies

• ASIC Power Supplies

• Embedded Processor and I/O Supplies

• DSP Supplies

POWER GOOD

ENABLE

PGOOD

EN

VIN

+

VIN

5.5V TO 14V

POWER GOOD

ENABLE

SYNCH

M/S

BOOT

VCC

PVCC

SS

ISL8502A

PHASE

VOUT

+

FS

SGND

PGND

FB

COMP

PGOOD

EN

PVCC

VCC

SS

SYNCH

M/S

FS

SGND

VIN

BOOT

ISL8502A

PHASE

PGND

FB

COMP

4.5V TO 5.5VVIN

+

VOUT

+

FIGURE 1. STAND-ALONE REGULATOR: VIN 5.5V TO 14V

FIGURE 2. STAND-ALONE REGULATOR: VIN 4.5V TO 5.5V

FN7940 Rev 0.00

October 21, 2011

Page 1 of 20

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