L5953 Datasheet, PDF (1/24 Pages) STMicroelectronics – MULTIPLE SWITCHING VOLTAGE REGULATOR

L5953
MULTIPLE SWITCHING VOLTAGE REGULATOR
PRODUCT PREVIEW
s PWM: ADJUSTABLE 2.5/10V - 1A
SWITCHING VOLTAGE REGULATOR
s EXTERNAL POWER MOS ABILITY FOR
OUTPUT CURRENT ENHANCEMENT
s SYNCHRONIZATION FUNCTION
s REG1- LINEAR LOW DROP 3.3/5V - 250mA
STBY VOLTAGE REGULATOR (LOW
CURRENT CONSUMPTION) with RESET
s REG2- LINEAR VOLTAGE REGULATOR 1.5V
to 3.3V EXTERNALLY ADJUSTABLE - 300mA
MAXIMUM CURRENT
s HSD1 : 500mA HIGH SIDE DRIVER
s HSD2 : 200mA HIGH SIDE DRIVER
s SPI INTERFACE
s SPI DIAGNOSTICS HSD1, HSD2
s DOUBLE SWITCHING FREQUENCY SPI
SELECTABLE
s DOUBLE INPUT LVW
PowerSO36
ORDERING NUMBER: L5953
– HSD1 & HSD2 short to gnd, open load and
short to battery (Test mode)
– Thermal warning
PROTECTIONS
s OVERVOLTAGE PROTECTION
s INTERNAL CURRENT LIMITING
s THERMAL SHUTDOWN
s ESD
SPI FUNCTIONS
s INPUT CONTROLS
– Turn-on/off PWM
– Turn-on/off REG2
– Turn-on/off HSD1
– Turn-on/off HSD2
– Switching frequency selection f1- f2
s OUTPUT FUNCTIONS:
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.
BLOCK DIAGRAM
S1 W1 S2 W2 VDD-LIN VDD-SW
STCAP CT
RES
HSD1
HSD2
VOLTAGE WARNING
HSD1
HSD2
REC1
ST-BY LINEAR VOLTAGE
REGULATOR
3.3-5V/250mA
PWM
STEP DOWN
REGULATOR
2.5-10V/1A
FGND
VSTBY
ADJ
STRAP
DRAINOUT
VSPI
IRQ
SPI INTERFACE
REC2
LINEAR VOLTAGE
REGULATOR
1.5-3.3V/300mA
OSCILLATOR &
SYNC
VSW
GATEIN
GATEOUT
FB
COMP
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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