L5953_07 Datasheet, PDF (1/31 Pages) STMicroelectronics – Multiple switching voltage regulator

L5953
Multiple switching voltage regulator
Features
■ 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
SPI functions
■ Input controls
– Turn-on/off PWM
– Turn-on/off REG2
– Turn-on/off HSD1
– Turn-on/off HSD2
– Switching frequency selection f1- f2
■ Output functions:
– HSD1 & HSD2 short to gnd, open load and
short to battery (Test mode)
– Thermal warning
PowerSO36
Protections
■ Over voltage protection
■ Internal current limiting
■ Thermal shutdown
■ ESD
Description
The L5953 is the integration of one switching
regulator, 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 voltage warnings are active.
The other regulators and high side drivers are
controlled by the SPI interface.
Table 1.
Device summary
Part number
L5953
Package
PowerSO36
Packing
Tray
September 2007
Rev 2
1/31
www.st.com
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