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L5953

MULTIPLE SWITCHING VOLTAGE REGULATOR

PRODUCT PREVIEW

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PWM: ADJUSTABLE 2.5/10V - 1A

SWITCHING VOLTAGE REGULATOR

EXTERNAL POWER MOS ABILITY FOR

OUTPUT CURRENT ENHANCEMENT

SYNCHRONIZATION FUNCTION

REG1- LINEAR LOW DROP 3.3/5V - 250mA

STBY VOLTAGE REGULATOR (LOW

CURRENT CONSUMPTION) with RESET

REG2- LINEAR VOLTAGE REGULATOR 1.5V

to 3.3V EXTERNALLY ADJUSTABLE - 300mA

MAXIMUM CURRENT

HSD1 : 500mA HIGH SIDE DRIVER

HSD2 : 200mA HIGH SIDE DRIVER

SPI INTERFACE

SPI DIAGNOSTICS HSD1, HSD2

DOUBLE SWITCHING FREQUENCY SPI

SELECTABLE

DOUBLE INPUT LVW

PowerSO36

ORDERING NUMBER: L5953

鈥?HSD1 & HSD2 short to gnd, open load and

short to battery (Test mode)

鈥?Thermal warning

PROTECTIONS

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OVERVOLTAGE PROTECTION

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INTERNAL CURRENT LIMITING

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THERMAL SHUTDOWN

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ESD

DESCRIPTION

The L5953 is the integration of one switching regula-

tor, two linear voltage regulators, two low voltage

warnings and two high side drivers. It has a stand-by

operation mode (low current consumption) where

only the stand-by voltage regulator plus the low volt-

age warnings are active. The other regulators and

high side drivers are controlled by the SPI interface.

SPI FUNCTIONS

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INPUT CONTROLS

鈥?Turn-on/off PWM

鈥?Turn-on/off REG2

鈥?Turn-on/off HSD1

鈥?Turn-on/off HSD2

鈥?Switching frequency selection f1- f2

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OUTPUT FUNCTIONS:

BLOCK DIAGRAM

S1

W1

S2

W2

VDD-LIN

VDD-SW

STCAP

CT

RES

FGND

VOLTAGE WARNING

REC1

ST-BY LINEAR VOLTAGE

REGULATOR

3.3-5V/250mA

VSTBY

ADJ

HSD1

HSD1

PWM

STEP DOWN

REGULATOR

2.5-10V/1A

STRAP

HSD2

HSD2

DRAINOUT

VSW

GATEIN

GATEOUT

FB

REC2

LINEAR VOLTAGE

REGULATOR

1.5-3.3V/300mA

COMP

OSCILLATOR &

SYNC

VSPI

IRQ

SPI INTERFACE

SWGND

GND

Q

D

S

C

VLR

FBLR

VIN

SYNC

DGND

D01AU1330A

September 2003

This is preliminary information on a new product now in development. Details are subject to change without notice.

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