TPS53851 Datasheet, PDF (1/64 Pages) Texas Instruments – DUAL OR 2-PHASE, STACKABLE CONTROLLER

TPS53851
www.ti.com
DUAL OR 2-PHASE, STACKABLE CONTROLLER
Check for Samples: TPS53851
SLUS985 – DECEMBER 2009
1 INTRODUCTION
1.1 FEATURES
12
• VDD From 4.5 V to 15 V, With Internal 5-V
Regulator
• V_OUT From 0.7 V to 5.8 V
• Converts From 15-V Input to 0.7-V Output at
1MHz
• Dual-Output or 2-Phase Interleaved Operation,
Stackable to 16 Phases
• Supports Pre-Biased Outputs
Programmable Switching Frequency Up to 1
MHz/Phase
• 0.5% Internally Trimmed 0.7-V Reference
• 10-μA Shutdown Current
• Current Mode Control with Forced Current
Sharing ⁽¹⁾
• 1-V to 40-V Power Stage Operation Range
• Power Sharing from Different Input Voltage
Rails, (e.g. Master from 5 V, Slave from 12 V)
• True Remote Sensing Differential Amplifier
• Programmable Input Undervoltage Lockout
• Resistive or Inductor DCR Current Sensing
• Provide a 6-Bit Digitally-Controlled Output
When Used With TPS40120
• 36-pin QFN Package
1.2 APPLICATIONS
• Graphic Cards
• Internet Servers
• Networking Equipment
• Telecommunications Equipment
• DC Power Distributed Systems
TPS53851
HDRV1
SW1
LDRV1
HDRV2
SW2
LDRV2
V
IN
CSRT1
CS1
L1
VIN
CSRT2
CS2
L2
V
OUT1
V
OUT2
UDG-09151
1.3 DESCRIPTION
The TPS53851 is a multifunctional
synchronous buck controller that can be
configured to provide either a single-output
two-phase power supply or a power supply
that supports two independent outputs.
Several TPS53851 controllers can be stacked
up to a 16-phase multiphase single output
power supply. Alternatively, several controllers
providing multiple independent outputs can be
synchronized in an interleaving pattern for
improved input ripple current.
The TPS53851 is capable of converting from a
15-V input to a 0.7-V output at 1MHz.
Each phase operates at a switching frequency
of up to 1 MHz. The two phases in one device
operate 180° out-of-phase. In a multiple device
stackable configuration, the phase shift of the
slaves, relative to a master, is programmable.
(1) Patents Pending
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.
PowerPAD is a trademark 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 © 2009, Texas Instruments Incorporated