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L5953

September 2003

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

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PWM: ADJUSTABLE 2.5/10V - 1A

SWITCHING VOLTAGE REGULATOR

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EXTERNAL POWER MOS ABILITY FOR

OUTPUT CURRENT ENHANCEMENT

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SYNCHRONIZATION FUNCTION

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

STBY VOLTAGE REGULATOR (LOW

CURRENT CONSUMPTION) with RESET

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REG2- LINEAR VOLTAGE REGULATOR 1.5V

to 3.3V EXTERNALLY ADJUSTABLE - 300mA

MAXIMUM CURRENT

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HSD1 : 500mA HIGH SIDE DRIVER

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HSD2 : 200mA HIGH SIDE DRIVER

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SPI INTERFACE

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SPI DIAGNOSTICS HSD1, HSD2

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DOUBLE SWITCHING FREQUENCY SPI

SELECTABLE

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DOUBLE INPUT LVW

SPI FUNCTIONS

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INPUT CONTROLS

– Turn-on/off PWM

– Turn-on/off REG2

– Turn-on/off HSD1

– Turn-on/off HSD2

– Switching frequency selection f1- f2

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OUTPUT FUNCTIONS:

– HSD1 & HSD2 short to gnd, open load and

short to battery (Test mode)

– 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.

PowerSO36

ORDERING NUMBER: L5953

PRODUCT PREVIEW

MULTIPLE SWITCHING VOLTAGE REGULATOR

BLOCK DIAGRAM

VOLTAGE WARNING

SPI INTERFACE

REC2

LINEAR VOLTAGE

REGULATOR

1.5-3.3V/300mA

HSD1

HSD1

HSD2

HSD2

COMP

FB

GATEOUT

GATEIN

VSW

DRAINOUT

STRAP

ADJ

VSTBY

GND

SWGND

S1

W1

S2

W2

VDD-LIN

REC1

ST-BY LINEAR VOLTAGE

REGULATOR

3.3-5V/250mA

PWM

STEP DOWN

REGULATOR

2.5-10V/1A

OSCILLATOR &

SYNC

STCAP

CT

RES

VDD-SW

IRQ

Q

D

S

C

VLR

FBLR

VIN

SYNC

VSPI

DGND

FGND

D01AU1330A