TPS40422 Datasheet, PDF (1/54 Pages) Texas Instruments – Dual-Output or Two-Phase Synchronous Buck Controller with PMBus

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TPS40422
SLUSAQ4C – OCTOBER 2011 – REVISED AUGUST 2012
Dual-Output or Two-Phase Synchronous Buck Controller with PMBus
Check for Samples: TPS40422
FEATURES
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• Single Supply Operation: 4.5 V to 20 V
• Output Voltage from 0.6 V to 5.6 V
• Dual or Two-Phase Synchronous Buck
Controller
• PMBus 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/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 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
• OC/OV/UV/OT Fault Protection
• 40-Pin, 6 mm × 6 mm, QFN Package
APPLICATIONS
• Multiple Rail Systems
• Telecom Base Station
• Switcher/Router Networking
• Server and Storage System
DESCRIPTION
The TPS40422 is a dual-output PMBus synchronous
buck controller. It can be configured also for a single,
two-phase output.
Its wide input range can support 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 is implemented to
reduce noise sensitivity and also ensures low duty
ratio conversion.
Using the PMBus protocol, the TPS40422 margining
function, reference voltage, fault limit, UVLO
threshold, soft start time and turn on/off delay can be
programmed.
In addition, an accurate measurement system is
implemented to monitor the output voltages, currents
and temperatures for each channel.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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