STEP-DOWN CONTROLLER. TPS51427A Datasheet

TPS51427A CONTROLLER. Datasheet pdf. Equivalent

Part TPS51427A
Description SYNCHRONOUS STEP-DOWN CONTROLLER
Feature TPS51427A www.ti.com ...............................................................................
Manufacture etcTI
Datasheet
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TPS51427A
TPS51427A
www.ti.com .................................................................................................................................................. SLUS843B – MAY 2008 – REVISED SEPTEMBER 2008
DUAL D-CAP™ SYNCHRONOUS STEP-DOWN CONTROLLER
FOR NOTEBOOK POWER RAILS
FEATURES
1
23 Fixed-Frequency Emulated On-Time Control;
Frequency Selectable from Three Options
D-CAP™ Mode Enables Fast Transient
Response Less than 100 ns
Advanced Ramp Compensation Allows Low
Output Ripple with Minimal Jitter
Selectable PWM-Only/OOA™/Auto-Skip Modes
Wide Input Voltage Range: 5.5 V to 28 V
Dual Fixed or Adjustable SMPS:
– 0.7 V to 5.9 V (Channel1)
– 0.5 V to 2.5 V (Channel2)
Fixed 3.3-V/5-V, or Adjustable Output 0.7-V to
4.5-V LDO; Capable of Sourcing 100 mA
Fixed 3.3-VREF Output Capable of Sourcing
10 mA
Temperature Compensated Low-Side RDS(on)
Current Sensing
Adaptive Gate Drivers with Integrated Boost
Switch
Bootstrap Charge Auto Refresh
Integrated Soft Start, Tracking Soft Stop
Independent PGOOD and EN for Each Channel
OOB Function Disabled. Refer to TPS51427 for
OOB-Enabled Device
APPLICATIONS
Notebook I/O and System Bus Rails
Graphics Application
PDAs and Mobile Communication Devices
DESCRIPTION
The TPS51427A is a dual synchronous step-down
controller designed for notebook and mobile
communications applications. This device is part of a
low-cost suite of notebook power bus regulators that
enables system designs with low external component
counts. The TPS51427A includes two
pulse-width-modulation (PWM) controllers, SMPS1
and SMPS2. The output of SMPS1 can be adjusted
from 0.7 V to 5.9 V, while the output of SMPS2 can
be adjusted from 0.5 V to 2.5 V. This device also
features a low-dropout (LDO) regulator that provides
a 5-V/3.3-V output, or adjustable from 0.7-V to 4.5-V
output via LDOREFIN. The fixed-frequency emulated
adaptive on-time control supports seamless operation
between PWM mode under heavy load conditions
and reduced frequency operation at light loads for
high-efficiency down to the milliampere range. An
integrated boost switch enhances the high-side
MOSFET to further improve efficiency. The main
control loop is the D-CAP™ mode that is optimized
for low equivalent series resistance (ESR) output
capacitors such as POSCAP or SP-CAP. Advanced
ramp compensation minimizes jitter without degrading
line and load regulation. RDS(on) current sensing
methods offers maximum cost saving.
The TPS51427A supports supply input voltages that
range from 5.5 V to 28 V. It is available in the 32-pin,
5-mm × 5-mm QFN package (Green, RoHs-
compliant, and Pb-free). The device is specified from
–40°C to +85°C.
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, OOA are trademarks of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
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 © 2008, Texas Instruments Incorporated



TPS51427A
TPS51427A
SLUS843B – MAY 2008 – REVISED SEPTEMBER 2008 .................................................................................................................................................. www.ti.com
TPS51427A
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.
ORDERING INFORMATION(1)
TA
–40°C to +85°C
PACKAGE
Plastic Quad Flatpack
(32-pin QFN)
ORDERABLE
PART NO.
TPS51427ARHBT
TPS51427ARHBR
TRANSPORT MEDIA
Tape and Reel
QUANTITY
250
3000
ECO STATUS(2)
Green
(RoHs and No
Sb/Br)
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Eco-Status information: Additional details including specific material content can be accessed at www.ti.com/leadfree
GREEN: Ti defines Green to mean Lead (Pb)-Free and in addition, uses less package materials that do not contain halogens, including
bromine (Br), or antimony (Sb) above 0.1% of total product weight.
N/A: Not yet available Lead (Pb)-Free; for estimated conversion dates, go to www.ti.com/leadfree.
Pb-FREE: Ti defines Lead (Pb)-Free to mean RoHS compatible, including a lead concentration that does not exceed 0.1% of total
product weight, and, if designed to be soldered, suitable for use in specified lead-free soldering processes.
2
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Copyright © 2008, Texas Instruments Incorporated





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