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TPS40422
SMBALRT
BP6
BPEXT
VDD
AGND
24 256
HDRV1
BOOT1
SW1
LDRV1
PGND
CS1P
CS1N
GSNS1
DIFFO1
FB1
COMP1
TSNS1
VSNS1
29
30
28
27
26
34
35
37
38
39
2
3
36
V
OUT1
HDRV2
BOOT2
SW2
LDRV2
CS2P
CS2N
GSNS2
FB2
COMP2
TSNS2
VSNS2
21
20
22
23
18
17
15
14
8
7
16
V
OUT2
32
9
BP3
ADDR1
ADDR0
CNTL2
PG2
RT
10
1
19
5
12
11
CLK
DATA
CNTL1
PG1
SYNC
13
40
33
4
31
V
IN
SMBALRT
CLK
DATA
CNTL1
PG1
SYNC
CNTL2
PG2
UDG-11278
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TPS40422
SLUSAQ4D –OCTOBER 2011–REVISED OCTOBER 2014
TPS40422 Dual-Output or Two-Phase Synchronous Buck Controller
with PMBus™ Interface
1 Features 3 Description
The TPS40422 is a dual-output PMBus protocol,
1
• Single Supply Operation: 4.5 V to 20 V
synchronous buck controller. It can be configured
• Output Voltage from 0.6 V to 5.6 V
also for a single, two-phase output.
• Dual-output or Two-Phase Synchronous Buck
The wide input range supports 5-V and 12-V
Controller
intermediate buses. The accurate reference voltage
• PMBus™ Interface Capability
satisfies the need of precision voltage to the modern
ASICs and potentially reduces the output
– Margining Up/Down with 2-mV Step
capacitance. Voltage mode control is implemented to
– Programmable Fault Limit and Response
reduce noise sensitivity and also ensures low duty
– Output Voltage, Output Current Monitoring
ratio conversion.
– External Temperature Monitoring with 2N3904
Device Information
(1)
– Programmable UVLO ON/OFF Thresholds
PART NUMBER PACKAGE BODY SIZE (NOM)
– Programmable Soft-Start Time and Turn-On
TPS40422 VQFN (40) 6.00 mm × 6.00 mm
and Turn-Off Delay
(1) For all available packages, see the orderable addendum at
• On-Chip Non-volatile Memory (NVM) to Store
the end of the datasheet.
Custom Configurations
• 180° Out-of-Phase to Reduce Input Ripple
Simplified Application
• 600-mV Reference Voltage with ±0.5% Accuracy
from 0°C to 85°C
• Inductor DCR Current Sensing
• Programmable Switching Frequency from 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, QFN Package with 0.5 mm
pin pitch
2 Applications
• Multiple Rail Systems
• Telecom Base Station
• Switcher/Router Networking
• Server and Storage System
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.
