TPS43331-Q1 Datasheet, PDF (1/50 Pages) Texas Instruments – DUAL SWITCHER AND LINEAR REGULATORS

TPS43331-Q1
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DUAL SWITCHER AND LINEAR REGULATORS
Check for Samples: TPS43331-Q1
SLVSA38 – DECEMBER 2009
FEATURES
1
• Input Operating Range 5 V to 30 V (VBAT),
With Transients Up to 40 V
• Two, Adjustable Output Voltage, Step-Down
Switching Voltage Regulators
• External Clock Input
• Soft-Start Control for Step-Down Regulators
• Programmable, Linear Regulator (VSTBY), Low
Quiescent Current (65uA typ.)
• Programmable, Linear Regulator (VLR)
• Overvoltage Detection and Shutdown
• Protected, High-Side Drive Ouput (HSD)
• Power-On Reset for Standby Regulator
(VSTBY)
• Serial Communication, I2C Interface
• Low Voltage Warning Detection With
Programmable Input Threshold (LVWIN,
VBATW)
• Enable Feature, Controls VBUCK 1
• Programmable Power Good Delay Time
(PGDLY) for VSTBY
• Current-Limit and Independent Thermal
Detection and Shutdown Protection on All
Regulators and High-Side Driver Output
• Operating Junction Temperature Range: -40°C
to 150°C
• Thermally Enhanced 38-Pin DAP PowerPAD™
Package
APPLICATIONS
• Qualified for Automotive Applications
• Power Supply for Microcontrollers and DSPs
DESCRIPTION
The TPS43331 is a multi-rail output voltage regulator, with two synchronous switch mode controllers and two
linear regulators. In addition, there is a reverse protected high side switch and voltage supervisor for monitoring
the standby regulator and input voltage. The regulator outputs and high side switch are controlled either by
discrete inputs for certain outputs and serial interface using the I2C configuration for outputs not controlled by
discrete inputs.
The standby linear regulator (VSTBY) is high voltage tolerant and can be connected directly to the vehicle
battery, the quiescent current is typically 65 µA to maintain a regulated output with light loads.
SIMPLIFIED SCHEMATIC
EFFICIENCY vs LOAD CURRENT (V_OUT = 5 V)
PGDLY
CSLEW
CBS1
VGT1
PH1
VBUCK 1
100
90
Vsupply
VCP
VGB1
VBAT*
VBATP
LVWIN
VINSB TPS43331
CBS2
VGT2
PH2
VGB2
VBAT
VSTBY
EN
I2CID
SDA
SCL
SYNCH
RST*
AGnd
VLR
HSD
VBUCK 2
VSTBY
VLREG
HSD
80
70
60
50
40
30
f_SW = 185 kHz
20
0
0.5
1
1.5
Load Current (A)
7Vin
12Vin
18Vin
24Vin
2
2.5
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated