TPS51285A Datasheet, PDF (1/32 Pages) Texas Instruments – Ultra-Low Quiescent (ULQ™) Dual Synchronous Step-Down Controller with 5V and 3.3V LDOs

TPS51285A
TPS51285B
www.ti.com
SLVSBX0 – APRIL 2013
Ultra-Low Quiescent (ULQ™) Dual Synchronous Step-Down Controller with
5V and 3.3V LDOs
Check for Samples: TPS51285A, TPS51285B
FEATURES
1
APPLICATIONS
•2 Input Voltage Range: 5 V to 24 V
• Notebook Computers
• Output Voltages: 5 V and 3.3 V (Adjustable
Range ±10%)
• Built-in, 100-mA, 5-V and 3.3-V LDOs
• Clock Output for Charge-Pump
• ±1% Reference Accuracy
• Adaptive On-Time D-CAP™ Mode Control
Architecture with 400 kHz (CH1) and 475 kHz
(CH2) Frequency
• Auto-skip and ULQ™ modes for long battery
life in system stand-by mode
• Internal 0.8-ms Voltage Servo Soft-Start
• Low-Side R_DS(on) Current Sensing Scheme
• Built-In Output Discharge Function
• Separate Enable Input for Switchers
• Dedicated OC Setting Terminals
• Power Good Indicator
• OVP, UVP and OCP Protection
• Non-Latch UVLO and OTP Protection
• Tablet Computers
DESCRIPTION
The TPS51285A and TPS51285B are cost-effective,
dual synchronous buck controllers with 5-V and 3.3-V
LDOs, targeted for notebook system-power supply
solutions. The device achieves low power
consumption by the use of auto-skip and ULQ™
modes, which is beneficial for long battery life in
system stand-by mode. The 256-kHz VCLK output is
provided to drive an external charge pump,
generating gate drive voltage for the load switches
with minimum power consumption in the main
converter. The device employs adaptive on-time D-
CAP™ mode control which enables fast load
transient response without external compensation
network. The TPS51285A/B operates with supply
input voltage ranging from 5V to 24V and supports
output voltages of 5 V and 3.3 V. The TPS51285A
and TPS51285B are available in a 20-pin 3 x 3 (mm)
QFN package and is specified from -40°C to 85°C.
• 20-Pin, 3 mm x 3 mm, QFN (RUK)
NEED SOME SPACE
ORDERING INFORMATION⁽¹⁾
ORDERABLE
DEVICE NUMBER
ALWAYS On-LDO
OUTPUT SUPPLY
QUANTITY
TPS51285ARUKR
TPS51285ARUKT
VREG3
Tape and Reel
Mini reel
3000
250
TPS51285BRUKR
TPS51285BRUKT
VREG3 and VREG5
Tape and Reel
Mini reel
3000
250
(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.
D-CAP, ULQ are trademarks of Texas Instruments.
2
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 © 2013, Texas Instruments Incorporated