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L5953 Datasheet

Multiple switching voltage regulator

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L5953 pdf
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
1
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STMicroelectronics Electronic Components Datasheet

L5953 Datasheet

Multiple switching voltage regulator

No Preview Available !

L5953 pdf
Contents
Contents
L5953
1 Block diagram and electrical specifications . . . . . . . . . . . . . . . . . . . . . . 6
2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.1 REG1 stand-by regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3 Low voltage warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.4 REG2 linear voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.5 High side drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.6 PWM step down voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.6.1 Error amplifier and compensation network . . . . . . . . . . . . . . . . . . . . . . 15
3 Internal pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 SPI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1 Signals Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3 Write Enable (WREN and Write Disable (WRDI)) . . . . . . . . . . . . . . . . . . 18
5 Summary of the main operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1 Operation A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 Operation B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Operation C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.4 Operation D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.5 Operation E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.6 Operation F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.7 Operation G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.8 Operation H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.9 IRQ - Interrupt Request Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6 Application note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1 REG1 output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.2 Feedback resistors for REG2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2/31
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Part Number L5953
Description Multiple switching voltage regulator
Maker STMicroelectronics
Total Page 30 Pages
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