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TPS40422
SLUSAQ4F – OCTOBER 2011 – REVISED JANUARY 2017
TPS40422 Dual-Output or Two-Phase Synchronous Buck Controller with PMBus™ Interface
1 Features
•1 Single Supply Operation: 4.5 V to 20 V • Output Voltage from 0.6 V to 5.6 V • Dual-output or Two-Phase Synchronous Buck
Controller • PMBus™ Interface Capability
– Margining Up or Down with 2-mV Step – Programmable Fault Limit and Response – Output Voltage, Output Current Monitoring – External Temperature Monitoring with 2N3904
Transistor – Programmable UVLO ON and OFF Thresholds – Programmable Soft-start Time and Turn-On
and Turn-Off Delay • On-Chip Non-volatile Memory (NVM) to Store
Custom Configurations • 180° Out-of-Phase to Reduce Input Ripple • 600-mV Reference Voltage with ±0.5% Accuracy
from 0°C to 85°C • Inductor DCR Current Sensing • Programmable Switching Frequency: 200 kHz to
1 MHz • Voltage Mode Control with Input Feed Forward • Current Sharing for Multiphase Operation • Supports Pre-biased Output • Differential Remote Sensing • External SYNC • BPEXT Pin Boosts Efficiency by Supporting
External Bias Power Switch Over • OC, OV, UV, and OT Fault Protection • 40-Pin, 6 mm × 6 mm VQFN Package with 0.5-
mm Pitch • 40-Pin, 5 mm × 5 mm WQFN Package with 0.4-
mm Pitch
2 Applications
• Multiple Rail Systems • Telecom Base Station • Switcher/Router Networking • Server and Storage System
3 Description
The TPS40422 is a dual-output PMBus protocol, synchronous buck controller. It can be configured also for a single, two-phase output.
The wide input range supports 5-V and 12-V intermediate buses. The accurate reference voltage satisfies the need of precision voltage to the modern ASICs and potentially reduces the output capacitance. Voltage mode control reduces noise sensitivity and also ensures low duty ratio conversion.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS40422
VQFN (40) WQFN (40)
6.00 mm × 6.00 mm 5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at the end of the datasheet.
Simplified Application
VOUT1
CLK DATA SMBALRT SYNC
12 CLK
31 VDD
BP3 32
11 DATA
ADDR1 9
13 SMBALRT
ADDR0 10
40 SYNC
RT 1
PG1 33 PG1 CNTL1 4 CNTL1
PG2 19 CNTL2 5
TPS40422
29 HDRV1
HDRV2 21
30 BOOT1
BOOT2 20
28 SW1
SW2 22
PG2 CNTL2
VIN VOUT2
27 LDRV1 26 PGND 34 CS1P 35 CS1N 37 VSNS1 39 DIFFO1
LDRV2 23
CS2P 18 CS2N 17 VSNS2 15
2 FB1
FB2 8
3 COMP1 38 GSNS1
COMP2 7 GSNS2 14
TSNS1 AGND BPEXT BP6 TSNS2
36 6 24 25 16
UDG-11278
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
TPS40422
SLUSAQ4F – OCTOBER 2011 – REVISED JANUARY 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Description (continued)......................................... 3 6 Pin Configuration and Functions ......................... 4 7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6 7.2 ESD Ratings.............................................................. 6 7.3 Recommended Operating Conditions....................... 6 7.4 Electrical Characteristics........................................... 7 7.5 Typical Characteristics ............................................ 11 8 Detailed Description ............................................ 12 8.1 Overview ................................................................. 12 8.2 Functional Block Diagram ....................................... 13 8.3 Feature Description................................................. 14 8.4 Device Functional Modes........................................ 23
8.5 Programming .......................................................... 26 8.6 Register Maps ........................................................ 27 9 Applications and Implementation ...................... 51 9.1 Application Information............................................ 51 9.2 Typical Application ................................................. 51 10 Power Supply Recommendations ..................... 60 11 Layout................................................................... 61 11.1 Layout Guidelines ................................................. 61 11.2 Layout Example .................................................... 62 12 Device and Documentation Support ................. 63 12.1 Device Support...................................................... 63 12.2 Community.