ISL8088(2009) 查看數據表（PDF） - Intersil

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ISL8088
(Rev.:2009)

Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

Intersil 

ISL8088

Pin Descriptions

DFN SYMBOL

DESCRIPTION

1

FB1

The feedback network of the Channel 1 regulator. FB1 is the negative input to the transconductance error

amplifier. The output voltage is set by an external resistor divider connected to FB1. With a properly

selected divider, the output voltage can be set to any voltage between the power rail (reduced by converter

losses) and the 0.6V reference. There is an internal compensation to meet a typical application. In addition,

the regulator power-good and undervoltage protection circuitry use FB1 to monitor the Channel 1 regulator

output voltage.

2

EN1

Regulator Channel 1 enable pin. Enable the output, VOUT1, when driven to high. Shutdown the VOUT1 and

discharge output capacitor when driven to low. Do not leave this pin floating.

3

VIN

Input supply voltage. Connect 10µF ceramic capacitor to power ground.

4

LX1

Switching node connection for Channel 1. Connect to one terminal of inductor for VOUT1.

5

NC

Recommended to connect this pin to the exposed pad.

6

SYNC Mode Selection pin. Connect to logic high or input voltage VIN for PFM mode; connect to logic low or ground

for forced PWM mode. Connect to an external function generator for Synchronization, and negative edge

trigger. Do not leave this pin floating.

7

LX2

Switching node connection for Channel 2. Connect to one terminal of inductor for VOUT2.

8

PG

1ms timer output. At power-up or EN_ HI, this output is a 1ms delayed Power-Good signal for both the

VOUT1 and VOUT2 voltages. There is an internal 1MΩ pull-up resistor.

9

EN2

Regulator Channel 2 enable pin. Enable the output, VOUT2, when driven to high. Shutdown the VOUT2 and

discharge output capacitor when driven to low. Do not leave this pin floating.

10

FB2

The feedback network of the Channel 2 regulator. FB2 is the negative input to the transconductance error

amplifier. The output voltage is set by an external resistor divider connected to FB2. With a properly

selected divider, the output voltage can be set to any voltage between the power-rail (reduced by converter

losses) and the 0.6V reference. There is an internal compensation to meet a typical application.

In addition, the regulator power-good and undervoltage protection circuitry use FB2 to monitor the Channel 2

regulator output voltage.

11 Exposed Pad The exposed pad must be connected to the PGND pin for proper electrical performance. Add as much vias

as possible for optimal thermal performance.

2

FN6858.0

September 21, 2009

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