LX13088A

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 2

Copyright

© 2010

Rev. 1.0, 2010-09-23

Dual 1A Step-Down Converters

TM

®

ABSOLUTE MAXIMUM RATINGS

PACKAGE PIN OUT

PVIN, AVIN to AGND, PGND......................................................................-0.3 to +7.0 V

SW1 and SW2 to AGND, PGND .................................................. PGND -2V to xVIN+2V

All other pins to AGND.................................................................... -0.3V to xVIN + 0.3V

Package

Notes: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground.

Currents are positive into, negative out of specified terminal. PGND must be wired to AGND

externally.

(Top View)

Marking

RoHS / Pb-free 100% Matte Tin Finish

FUNCTIO N AL PIN DESCRIP T ION

Name

Pin #

Description

FB2

1

Feedback from VO2. Connect voltage divider to the load side of VO2 output inductor-capacitor filter.

AVIN

2

Analog Input. Input to power the internal circuitry of the device, connect to PVIN through a 10Ω resistor and

bypass through a 1μF ceramic capacitor between this pin and PGND, as close to the LX13088A as

possible.

PVIN

3

Control MOSFET switch power inputs. Connect a 10µF ceramic capacitor between this pin and PGND, as

close to the LX13088A as possible.

SW2

4

Converter 2 synchronous buck switching output. Connect to VO2 inductor.

PGND

5

Power Ground Connection. Synchronous rectifier MOSFET source. Provide a star connection between this

pin, VO1, VO2 filter capacitor returns, VIN input capacitor return, and AGND. Keep the star connection as

close to the LX13088A IC as possible.

SW1

6

Converter 1 synchronous buck switching output. Connect to VO1 inductor.

E/S

7

Enable/Synchronization. Pulling this pin high statically enables the LX13088A and pulling the pin low

statically will shut down the LX13088A. Applying a pulse to this pin will synchronize SW1 and SW2

switching frequency to ½ the external clock frequency.

POR

8

Power On Reset output pin. Monitors FB1, FB2 output voltage levels and VIN. POR is pulled low if an

output voltage droop is detected on FB1 or FB2 or VIN, and is Hi-Z during normal operation.

VMON

9

Voltage Monitor – Supervisor for one external voltage (could be input voltage). The POR output is triggered

if this output falls below the VMON threshold.

FB1

10

Feedback from VO1. Connect voltage divider to the load side of VO1 output inductor-capacitor filter.

AGND

PAD

Analog Ground. Connect the exposed pad on the bottom of the package to the GND plane for a thermal

heat sink.

088A

Date/Lot Code

MSC