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TPS65400-Q1
SLVSCQ2 –JULY 2015
TPS65400-Q1 4.5- to 18-V Input Flexible Power Management Unit With PMBus/I2C Interface
1 Features
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PWM Frequency Adjustment for Each Switcher
Individual PWM Phase Alignment for Each
Switcher to Minimize Ripple and Capacitor
Size
1
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Qualified for Automotive Applications
AEC-Q100 Qualified With the Following Results:
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Device Temperature Grade 1: –40°C to 125°C
Ambient Operating Temperature Range
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Adjustable Current Limit on Each Regulator
Enables Size and Cost Optimization of
Inductors
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Device HBM ESD Classification Level H2
Device CDM ESD Classification Level C4B
Soft-Start Time
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Efficiency up to 95% for Each Switching Regulator
Switching Regulator Specifications:
2 Applications
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Input Voltage Range: 4.5 to 18 V
Vout Range: 0.6 V-90%Vin
SW1, SW2 Iout: 4-A Max
SW3, SW4 Iout: 2-A Max
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Qualified for Automotive Applications
Small Cellular Base Stations (BTS) (for Example:
Picocells and Microcells); Macro BTS (Using
Multiple PMUs)
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Power over Ethernet (PoE) Powered
Communications Infrastructure Equipment
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Pre-Bias Startup Algorithm Minimizes Voltage Dip
During Startup
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Powering DSP and MCUs
Internal Undervoltage Lockout (UVLO),
Overcurrent Protection (OCP), Overvoltage
Protection (OVP), and Overtemperature Protection
(OTP)
Industrial and Factory Automation
Systems Requiring Small Form Factor, High-
Efficiency, High-Ambient Operating Temperature,
and Flexible Power Management
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Thermally-Enhanced 7-mm × 7-mm 48-Pin, 0.5-
mm Pitch VQFN Package
3 Description
Pin Accessible Features:
The TPS65400-Q1 is an integrated PMU optimized
for applications requiring small form factor and high
power conversion efficiency, enabling small space-
constrained equipment with high ambient operating
temperature without cooling. It provides high-power
efficiency at a system level by enabling a single stage
conversion from an intermediate distribution bus with
an optimized combination of regulators.
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Adjustable VOUT With External Feedback
Resistors
Sequencing Control Through Precision Enable
Pins for Each Switcher
Resistor Adjustable PWM Switching Frequency
from 275 kHz to 2.2 MHz
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Clock Sync Input and Clock Output
Device Information(1)
Soft-Start Delay Through External Capacitor
Current Sharing Between SW1 and SW2 and
Between SW3 and SW4 Allows Support of
Higher Current Needs if Required
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65400-Q1
VQFN (48)
7.00 mm × 7.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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PMBus Runtime Control and Status
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Runtime Voltage Positioning Through
Adjustment of VREF
Simplified Schematic
Vin: 4.5 to 18 V
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Enable and Disable of Each Switcher
Fault and Status Monitoring
4 A
4 A
2 A
2 A
User-Configurable PMBus / I2C Options, Saved in
EEPROM
BUCK1
BUCK2
BUCK4
BUCK3
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Power Supply Turn-On and Turn-Off
Sequencing
Sequencing can be Based on Fixed Time
Delays or PGOOD Dependence
PMBus/I2C
Initial Voltage Positioning Through VREF
Configuration
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.