TPS51225, TPS51225B, TPS51225C
www.ti.com
SLUSAV0B – JANUARY 2012 – REVISED SEPTEMBER 2012
Dual Synchronous, Step-Down Controller with 5-V and 3.3-V LDOs
Check for Samples: TPS51225, TPS51225B, TPS51225C
FEATURES
APPLICATIONS
1
•
•
Input Voltage Range: 5.5 V to 24 V
• Notebook Computers
Output Voltages: 5 V and 3.3 V (Adjustable
• Netbook, Tablet Computers
Range ±10%)
DESCRIPTION
Built-in, 100-mA, 5-V and 3.3-V LDOs
The TPS51225/B/C is a cost-effective, dualClock Output for Charge-Pump
synchronous buck controller targeted for notebook
±1% Reference Accuracy
system-power supply solutions. It provides 5-V and
Adaptive On-time D-CAP™ Mode Control
3.3-V LDOs and requires few external components.
The 260-kHz VCLK output can be used to drive an
Architecture with 300kHz/355kHz Frequency
external charge pump, generating gate drive voltage
Setting
for the load switches without reducing the main
Auto-skip Light Load Operation (TPS51225/C)
converter efficiency. The TPS51225/B/C supports
OOA Light Load Operation (TPS51225B)
high efficiency, fast transient response and provides a
combined power-good signal. Adaptive on-time, DInternal 0.8-ms Voltage Servo Soft-Start
CAP™ control provides convenient and efficient
Low-Side RDS(on) Current Sensing Scheme with
operation. The device operates with supply input
4500 ppm/°C Temperature Coefficient
voltage ranging from 5.5 V to 24 V and supports
Built-in Output Discharge Function
output voltages of 5.0 V and 3.3 V. The
TPS51225/B/C is available in a 20-pin, 3 mm × 3
Separate Enable Input for Switchers
mm, QFN package and is specified from –40°C to
(TPS51225/B/C)
85°C.
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)
2
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
ORDERABLE
DEVICE NUMBER
TPS51225RUKR
TPS51225RUKT
TPS51225BRUKR
TPS51225BRUKT
TPS51225CRUKR
TPS51225CRUKT
(1)
ENABLE
FUNCTION
SKIP MODE
ALWAYS ON-LDO
EN1/ EN2
Auto-skip
VREG3
EN1/ EN2
OOA
VREG3
EN1/ EN2
Auto-skip
VREG3 & VREG5
OUTPUT
SUPPLY
QUANTITY
Tape and Reel
PACKAGE
3000
Mini reel
250
Tape and Reel
3000
Mini reel
250
Tape and Reel
3000
Mini reel
PLASTIC Quad
Flat Pack
(20 pin QFN)
250
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
2
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.
D-CAP, Out-of-Audio are trademarks 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