ISL8510 查看數據表（PDF） - Renesas Electronics

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ISL8510

Dual Output Controller with 1A Standard Buck PWM and LDO

Renesas Electronics 

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ISL8510

Dual Output Controller with 1A Standard Buck PWM and LDO

FN6516

Rev 2.00

December 15, 2008

The ISL8510 is a high-performance, dual output controller

that provides a single, high frequency power solution for a

variety of point of load applications. The ISL8510 integrates

a 1A standard buck PWM controller and switching MOSFET

with one 500mA LDO.

The PWM controller in the ISL8510 drives an internal

switching N-Channel power MOSFET and requires an

external Schottky diode to generate an output voltage from

0.6V to 20V. The integrated power switch is optimized for

excellent thermal performance up to 1A of output current. The

standard buck input voltage range supports a fixed 5V or

variable 5.5V to 25V range. The PWM regulator switches at a

fixed frequency of 500kHz and utilizes simple voltage mode

control with input voltage feed forward to provide flexibility in

component selection and minimize solution size. Protection

features include overcurrent, undervoltage, and thermal

overload protection integrated into the IC. The ISL8510

power-good signal output indicates loss of regulation on the

PWM output.

The ISL8510 features one adjustable LDO regulator using

internal PMOS transistors as pass devices. The enable pin

(EN_LDO) controls the LDO output. A single power-good

signal output indicates loss of regulation on the LDO output.

Independent overcurrent and thermal fault shutdown monitors

are integrated into the “LDO Regulator Capacitor Selection”

on page 16.

The ISL8510 is available in a small 4mmx4mm Quad Flat No

Lead (QFN) package.

Features

• Standard Buck Controller with Integrated Switching Power

MOSFET + 1 LDO

• Integrated Boot Diode

• Input Voltage Range

- Fixed 5V ±10%

- Variable 5.5V to 25V

• PWM Output Voltage Adjustable from 0.6V to 20V with

Continuous Output Current up to 1A

• Voltage Mode Control with Voltage Feed Forward

• Fixed 500kHz Switching Frequency

• Externally Adjustable Soft-Start Time

• Output Undervoltage Protection

• LDO Adjustable Options

- LDO, 0.6V to 4.2V . . . . . . . . . . . . . . . . . . . . . . . 500mA

• Individual Enable Inputs

• Two PGOOD Outputs (PWM and LDO)

• Overcurrent Protection

• Thermal Overload Protection

• Internal 5V LDO regulator

• Pb-Free (RoHS Compliant)

Applications

• General Purpose

• WLAN Cards-PCMCIA, Cardbus32, MiniPCI Cards-

Compact Flash Cards

• Hand-Held Instruments

FN6516 Rev 2.00

December 15, 2008

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