TPS40422_16 Datasheet, PDF (1/71 Pages) Texas Instruments – Dual-Output or Two-Phase Synchronous Buck Controller with PMBus Interface

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TPS40422
SLUSAQ4E – OCTOBER 2011 – REVISED SEPTEMBER 2016
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/Down with 2-mV Step
– Programmable Fault Limit and Response
– Output Voltage, Output Current Monitoring
– External Temperature Monitoring with 2N3904
– Programmable UVLO ON/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/OT Fault Protection
• 40-Pin, 6 mm × 6 mm VQFN Package with 0.5-
mm pin 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)
6.00 mm × 6.00 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
27 LDRV1
26 PGND
34 CS1P
35 CS1N
37 VSNS1
39 ^DIFFO1
LDRV2 23
CS2P 18
CS2N 17
VSNS2 15
2 FB1
FB2 8
PG2
CNTL2
VIN
VOUT2
3 COMP1
38 GSNS1
COMP2 7
GSNS2 14
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.