Step-Down Controller. TPS51285A Datasheet

TPS51285A Controller. Datasheet pdf. Equivalent

Part TPS51285A
Description Dual Synchronous Step-Down Controller
Feature TPS51285A TPS51285B www.ti.com SLVSBX0 – APRIL 2013 Ultra-Low Quiescent (ULQ™) Dual Synchronous S.
Manufacture etcTI
Datasheet
Download TPS51285A Datasheet



TPS51285A
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 RDS(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



TPS51285A
TPS51285A
TPS51285B
SLVSBX0 – APRIL 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
TYPICAL APPLICATION DIAGRAMS
VBAT/
VADPTOR
5V
output
Charge pump
output
EN-5V
5 V LDO
VIN
VBST1
DRVH1
VBST2
DRVH2
SW1
SW2
DRVL1
VO1
VFB1
CS1
VCLK
EN1
VREG5
DRVL2
VFB2
CS2
PGOOD
EN2
VREG3
GND
3.3 V
output
PGOOD
EN 3.3 V
3.3-V LDO
Figure 1. TYPICAL APPLICATION DIAGRAM (With Charge Pump)
2
Submit Documentation Feedback
Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: TPS51285A TPS51285B





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)