nPOR2

nPOR1

AND

AND

OR2

PGND

SW

Buck1

FB1

EN_I2C

EN1

SW1

PGND1

PGND

SW2

Buck2

POR2

FB2

EN2

SW2

PGND2

SGND

buck2 control

buck1 control

FB1

SDA

SCL

I

2

C

Registers

EPROM

EN2

FB2

SCL

SDA

EN1

POR1

EN_bk2

EN_bk1

U1

U2

LM3370

SNVS406N – NOVEMBER 2005 – REVISED MAY 2013

www.ti.com

DESCRIPTION (CONTINUED)

There is a power-on-reset function that monitors the level of the output voltage to avoid unexpected power

losses. The independent enable pin for each output allows for simple and effective power sequencing.

LM3370 is available in a 4mm by 5mm 16-lead non-pullback WSON and a 20-bump DSBGA, 3.0mm x 2.0mm x

0.6mm, package. A high switching frequency—2 MHz (typ)—allows use of tiny surface-mount components

including a 2.2µH inductor.

Default fixed voltages for the 2 output voltages combination can be customized to fit system requirements by

contacting Texas Instruments.

Functional Block Diagram

Typical Performance Curve

2

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