TPS40400_15 Datasheet, PDF (1/82 Pages) Texas Instruments – TPS40400 3-V to 20-V PMBus Synchronous Buck Controller

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TPS40400
SLUS930C – APRIL 2011 – REVISED OCTOBER 2015
TPS40400 3-V to 20-V PMBus Synchronous Buck Controller
1 Features
•1 Input Operating Voltage Range: 3 V to 20 V
• PMBus Enabled Analog Controller
• Reference 600 mV ± 1%
• Remote Voltage Sense Amplifier
• Internal 6-V Regulator and 6-V Gate Drive
• Programmable Overcurrent Protection
• Inductor Resistance or Series Resistance Used
for Current Sensing
• Programmable Switching Frequency: 200 kHz to 2
MHz
• Powergood Indicator
• Thermal Shutdown
• Programmable Soft-Start
• Internal Bootstrap Diode
• Prebias Output Safe
• 24-Pin QFN Package
2 Applications
• Smart Power Systems
• Power Supply Modules
• Communications Equipment
• Computing Equipment
3 Description
The TPS40400 is a cost-optimized flexible
synchronous buck controller that operates from a
nominal 3-V to 20-V supply. This controller is an
analog PWM controller that allows programming and
monitoring through the PMBus™ interface. Flexible
features found on this device include programmable
soft-start time, programmable short circuit limit, and
programmable undervoltage lockout (UVLO).
An adaptive anti-cross conduction scheme is used to
prevent shoot through current in the power FETs.
Gate drive voltage is 6 V to better enhance the power
FETs for reduced losses. Short circuit detection
occurs by sensing the voltage drop across the
inductor or across a resistor placed in series with the
inductor. A PMBus programmable threshold is
compared to this voltage and is used to detect
overcurrent. When the overcurrent threshold is
reached, a pulse by pulse current limit scheme is
used to limit the current to acceptable levels. If the
overcurrent condition persists for more than 7 clock
cycles of the converter, a fault condition is declared
and the converter shuts down and goes into either a
hiccup restart mode or latches off. The behavior can
be selected through the PMBus interface. Other
PMBus interface features include programmable
operating frequency, soft-start time, overvoltage and
undervoltage thresholds and the response to those
events, output voltage change including margining as
well as status monitoring.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS40400
VQFN (24)
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application
SMBALRT
DATA
VIN
CLK
1 CLK
DATA 24
CNTL
2 CNTL
SMBALRT 23
PGOOD
3 PGOOD
ADDR1 22
SYNC
4 SYNC
ADDR0 21
TRACK
5 TRACK
VDD 20
6 COMP
7 FB
TPS40400
HDRV 19
BOOT 18
8 DIFFO
SW 17
9 VSNS+
10 VSNS–
11 ISNS–
ISNS+
12
SGND
25
LDRV 16
GND 15
BP6 14
BP3
13
1
VOUT+
VOUT–
SNS+
SNS–
UDG-09073
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.