TPS40428 Controller Datasheet

TPS40428 Datasheet, PDF, Equivalent


Part Number

TPS40428

Description

Synchronous Buck Driverless Controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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TPS40428
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TPS40428
SLUSBV0A – MAY 2014 – REVISED JULY 2014
TPS40428 Dual Output, 2-Phase, Stackable PMBus™ Synchronous Buck Driverless
Controller with Adaptive Voltage Scaling (AVS) Bus
1 Features
1 Smart Power Mode in Factory Default (Compatible
with TI Smart Power Stage CSD95378B and Pin-
for-Pin Equivalent to TPS40425 – Non-Smart
Power Mode in Factory Default)
• Single Supply Operation: 4.5 V to 20 V
• VOUT from 0.6 V
• Dual or Multi-Phase Synchronous Buck Controller
• Individual High-Speed AVS Interface
• Fast Transient Response
• Stackable up to Four Phases
– 2-, 3-, or 4-Phase Interleaved Phase Shifts
– Accurate Current Sharing
• PMBus Interface Capability
– Margining Up/Down with 2-mV Step
– Programmable Fault Limit and Response
– ±0.8% VOUT
– Accuracy Current Monitoring
– ±3°C External Temperature Monitoring In
Smart Power Mode
– Programmable UVLO ON/OFF Thresholds
– Programmable Soft-Start Time, Turn-On
Delay, and Turn-Off Delay
• On-Chip Non-Volatile Memory (NVM) to Store
Custom Configurations
• 0.6-V Reference Voltage with 0.5% Accuracy from
–40°C to 125°C
• Programmable ƒSW from 200 kHz to 1.5 MHz
• Supports Pre-biased Output
• Differential Remote Sensing
• Synchronization to an Extermal Clock
• OC/OV/UV/OT Fault Protection
• 40-Pin, 6 mm × 6 mm, QFN Package
2 Applications
• Wireless Infrastructure
• Switcher/Router Networking/Server/Storage
3 Description
The TPS40428 device is a PMBus, synchronous
buck, driverless controller. It operates in smart power
mode with factory default settings, and it can operate
in non-smart power mode after PMBus programing
and power reboot. It can be configured for dual-
output or 2-phase operation. It is also stackable up to
4 phases to support load current as high as 120 A.
Interleaved phase shift for 2-. 3-, or 4-phases reduce
the input and output ripples therefore reducing input
and output capacitance.
The wide input voltage range can support 5-V and
12-V intermediate supply buses. The 0.5% reference
voltage satisfies the need of precision voltage to the
modern ASICs.
Using the PMBus standard, the TPS40428 device
can program reference voltage, fault limit, UVLO
threshold, soft-start time and turn-on and turn-off
delay.
In addition, the device implements an accurate
measurement system to monitor the output voltages,
currents and temperatures for individual channels.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS40428
RHA (40)
6.00 mm × 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application (Dual Output)
GND
VOUT1
GND
Smart Power Stage
VIN
SW
GND
PWM
TAO
IOUT
REFIN
TPS40428
PWM1
TSNS1
CS1P
CS1N
PWM2
TSNS2
CS2P
CS2N
ISH1
FLT1
{Remote SNS to VOUT1
DIFFO1
VSNS1
GSNS1
ISH2
FLT2
VSNS2
GSNS2
FB1
COMP1
FB2
COMP2
Smart Power Stage
PWM
TAO
IOUT
REFIN
VIN
SW
GND
VIN
GND
GND
VOUT2
VOUT2
GND
PG1
PG2
CNTL1
SYNC
CNTL2
VDD
VIN
{PMBus Interface
PHSET
BP3
PMBDATA AGND
PMBCLK
SMBALERT BP5
RT PGND
ADDR0 AVSDATA
ADDR1 AVSCLK
}High-Speed AVSBUS
GND
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.

TPS40428
TPS40428
SLUSBV0A – MAY 2014 – REVISED JULY 2014
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 Handling Ratings ...................................................... 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics ............................................ 10
7 Detailed Description ............................................ 12
7.1 Overview ................................................................. 12
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 23
7.5 Programming........................................................... 24
7.6 Register Maps ......................................................... 29
8 Applications and Implementation ...................... 71
8.1 Application Information............................................ 71
8.2 Typical Application .................................................. 71
9 Power Supply Recommendations...................... 80
10 Layout................................................................... 80
10.1 Layout Guidelines ................................................. 80
10.2 Layout Example .................................................... 81
11 Device and Documentation Support ................. 82
11.1 Development Support ........................................... 82
11.2 Trademarks ........................................................... 83
11.3 Electrostatic Discharge Caution ............................ 83
11.4 Glossary ................................................................ 83
12 Mechanical, Packaging, and Orderable
Information ........................................................... 84
4 Revision History
Changes from Original (MAY 2014) to Revision A
Page
• Updated Pin Functions table .................................................................................................................................................. 3
• Updated notes and conditions in Electrical Characteristics table. No updates to specifications. .......................................... 5
• Added clarity to Table 4 ....................................................................................................................................................... 26
• Added clarity to Table 5 ....................................................................................................................................................... 27
• Added clarity to Table 6 ....................................................................................................................................................... 29
• Updated (E0h) MFR_SPECIFIC_16 (COMM_EEPROM_SPARE) section ......................................................................... 61
2 Submit Documentation Feedback
Product Folder Links: TPS40428
Copyright © 2014, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS40428 SLUSBV0A – MAY 20 14 – REVISED JULY 2014 TPS40428 Dual Output, 2-Phase, Stackable PMBus™ Syn chronous Buck Driverless Controller wit h Adaptive Voltage Scaling (AVS) Bus 1 Features •1 Smart Power Mode in Fact ory Default (Compatible with TI Smart P ower Stage CSD95378B and Pinfor-Pin Equ ivalent to TPS40425 – Non-Smart Power Mode in Factory Default) • Single Su pply Operation: 4.5 V to 20 V • VOUT from 0.6 V • Dual or Multi-Phase Sync hronous Buck Controller • Individual High-Speed AVS Interface • Fast Trans ient Response • Stackable up to Four Phases – 2-, 3-, or 4-Phase Interleav ed Phase Shifts – Accurate Current Sh aring • PMBus Interface Capability Margining Up/Down with 2-mV Step – Programmable Fault Limit and Response ±0.8% VOUT – Accuracy Current Mon itoring – ±3°C External Temperature Monitoring In Smart Power Mode – Programmable UVLO ON/OFF Thresholds – Programmable Soft-Start Time, Tu.
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