TPS51275, TPS51275C
www.ti.com
SLUSB45 –JUNE 2012
Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs
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FEATURES
APPLICATIONS
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Input Voltage Range: 5 V to 24 V
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Notebook Computers
Tablet Computers
Output Voltages: 5 V and 3.3 V (Adjustable
Range ±10%)
DESCRIPTION
The TPS51275/C is
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Built-in, 100-mA, 5-V and 3.3-V LDOs
Clock Output for Charge-Pump
±1% Reference Accuracy
a
cost-effective, dual-
synchronous buck controller targeted for notebook
system-power supply solutions. It provides 5-V and
3.3-V LDOs and requires few external components.
The 260-kHz VCLK output can be used to drive an
external charge pump, generating gate drive voltage
for the load switches without reducing the main
converter efficiency. The TPS51275/C supports high
efficiency, fast transient response and provides a
combined power-good signal. Adaptive on-time, D-
CAP™ control provides convenient and efficient
operation. The device operates with supply input
voltage ranging from 5 V to 24 V and supports output
voltages of 5.0 V and 3.3 V. The TPS51275/C is
available in a 20-pin, 3 mm × 3 mm, QFN package
and is specified from –40°C to 85°C.
Adaptive On-time D-CAP™ Mode Control
Architecture with 300kHz/355kHz Frequency
Setting
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Auto-skip Light Load Operation
Internal 0.8-ms Voltage Servo Soft-Start
Low-Side RDS(on) Current Sensing Scheme with
4500 ppm/°C Temperature Coefficient
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Built-in Output Discharge Function
Separate Enable Input for Switchers
Dedicated OC Setting Terminals
Power Good Indicator
OVP/UVP/OCP Protection
Non-latch UVLO/OTP Protection
20-Pin, 3 mm × 3 mm, QFN (RUK)
ORDERING INFORMATION(1)
ORDERABLE
DEVICE NUMBER
ENABLE
FUNCTION
ALWAYS ON-LDO
PACKAGE
OUTPUT SUPPLY
QUANTITY
TPS51275RUKR
TPS51275RUKT
TPS51275CRUKR
TPS51275CRUKT
Tape and Reel
Mini reel
3000
250
VREG3
PLASTIC Quad Flat
Pack
EN1 and EN2
Tape and Reel
Mini reel
3000
250
(20 pin QFN)
VREG3 and VREG5
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
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.
2
D-CAP is a trademark of Texas Instruments.
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 © 2012, Texas Instruments Incorporated