AAT1157 Ver la hoja de datos (PDF) - Analog Technology Inc

Número de pieza

componentes Descripción

Fabricante

AAT1157

1MHz 1.2A Buck DC/DC Converter

Analog Technology Inc 

AAT1157

1MHz 1.2A Buck DC/DC Converter

Pin Descriptions

Pin #

1, 2, 3

Symbol

PGND

4

FB

5

SGND

7

EN

6, 8, 16

9

10, 11, 12

13, 14, 15

EP

N/C

VCC

VP

LX

Function

Main power ground return pin. Connect to the output and input capacitor

return. (See board layout rules.)

Feedback input pin. This pin is connected to the converter output. It is used to

set the output of the converter to regulate to the desired value via an internal

resistive divider. For an adjustable output, an external resistive divider is con-

nected to this pin.

Signal ground. Connect the return of all small signal components to this pin.

(See board layout rules.)

Enable input pin. A logic high enables the converter; a logic low forces the

AAT1157 into shutdown mode reducing the supply current to less than 1µA.

The pin should not be left floating.

Not internally connected.

Bias supply. Supplies power for the internal circuitry. Connect to input power

via low pass filter with decoupling to SGND.

Input supply voltage for the converter power stage. Must be closely decoupled

to PGND.

Connect inductor to these pins. Switching node internally connected to the

drain of both high- and low-side MOSFETs.

Exposed paddle (bottom); connect to PGND directly beneath package.

Pin Configuration

QFN33-16

(Top View)

PGND 1

PGND 2

PGND 3

FB 4

12 VP

11 VP

10 VP

9 VCC

2

1157.2005.11.1.4

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