TPS40425_15 Datasheet, PDF (1/95 Pages) Texas Instruments – TPS40425 Dual Output, 2-Phase, Stackable PMBus™ Synchronous Buck Driverless Controller with Adaptive Voltage Scaling (AVS) Bus

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TPS40425
SLUSBO6A – JANUARY 2014 – REVISED JULY 2014
TPS40425 Dual Output, 2-Phase, Stackable PMBus™ Synchronous Buck Driverless
Controller with Adaptive Voltage Scaling (AVS) Bus
1 Features
•1 Non-Smart Power Mode in Factory Default
• Pin-for-Pin Equivalent to TPS40428 – Smart
Power Mode in Factory Default
• Single Supply Operation: 4.5 V to 20 V
• V_OUT from 0.6 V
• Dual or Multi-Phase Synchronous Buck Controller
• Individual High-Speed AVS Interface
(0.5-V to 1.5-V Range)
• Fast Transient Response
• Stackable up to Four Phases
– 2-, 3-, or 4-Phase Interleaved Phase Shifts
– Accurate Current Sharing
• PMBus Capability
– Margining Up or Down with 2-mV Step
– Programmable Fault Limit and Response
– ±0.8% V_OUT
– Accuracy Current Monitoring
– ±4.5°C External Temperature Monitoring with
x3904
– 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
• Inductor DCR Current Sensing
• Programmable ƒ_SW 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
• Support for TI Power Stage
• Compatible with High-Frequency, Synchronous
MOSFET Driver TPS28226
2 Applications
• Wireless Infrastructure
• Switcher/Router Networking/Server/Storage
3 Description
The TPS40425 is a PMBus, synchronous buck,
driverless controller. It operates in non-smart power
mode in factory default setting, and it can operate in
smart power mode after PMBus programming and
power reboot. It can be configured as dual-output or
2-phase. 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 TPS40425 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.
PART NUMBER
TPS40425
Device Information
PACKAGE
BODY SIZE (NOM)
VQFN (40)
6.00 mm × 6.00 mm
VOUT1
GND
Simplified Application Diagram
(Dual Output)
Power Stage
VIN
BOOT
GND
TPS40425
BP3
VDD
SW
PWM
PWM1
ISH1
CS1P
PWM2
ISH2
CS2P
CS1N
CS2N
{ ^{Remote SNS to VOUT1}
DIFFO1
VSNS1
GSNS1
VSNS2
GSNS2
FB1
COMP1
PG1
CNTL1
SYNC
PHSET
FB2
COMP2
PG2
CNTL2
RT
Power Stage
GND
VIN
BOOT
PWM
SW
VOUT2
GND
{ ^{PMBus Interface}
TSNS1
PMBDATA
TSNS2
PMBCLK
SMBALERT ^AGND
ADDR0 AVSDATA1
ADDR1 AVSCLK1
}^{Temperature Sense}
}^{High-Speed AVSBUS}
VIN
4.5 V to 17 V
GND
VOUT2
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.