TPS43350-Q1
TPS43351-Q1
www.ti.com
SLVSAR7B –JUNE 2011–REVISED MAY 2012
LOW IQ, DUAL SYNCHRONOUS BUCK CONTROLLER
Check for Samples: TPS43350-Q1, TPS43351-Q1
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FEATURES
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Qualified for Automotive Applications
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Frequency Spread Spectrum (TPS43351-Q1)
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AEC-Q100 Test Guidance With the Following
Results:
Selectable Forced Continuous Mode or
Automatic Low-Power Mode at Light Loads
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Device Temperature Grade 1: –40°C to
125°C Ambient Operating Temperature
•
•
Sense Resistor or Inductor DCR Sensing
Out-of-Phase Switching Between Buck
Channels
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–
Device HBM ESD Classification Level H2
Device HBM CDM Classification Level C2
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Peak Gate Drive Current 1.5 A
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•
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Two Synchronous Buck Controllers
Thermally Enhanced, 38-Pin HTSSOP (DAP)
PowerPAD™ Package
Input Range up to 40 V, (Transients up to 60 V)
Low-Power Mode IQ: 30 µA (One Buck On),
35 µA (Two Bucks On)
APPLICATIONS
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Automotive Infotainment, Navigation, and
Instrument Cluster Systems
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Low Shutdown Current Ish < 4 µA
Buck Output Range 0.9 V to 11 V
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Industrial/Automotive Multi-Rail DC Power
Distribution Systems and Electronic Control
Units
Programmable Frequency and External
Synchronization Range 150 kHz to 600 kHz
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Separate Enable Inputs (ENA, ENB)
DESCRIPTION
The TPS43350-Q1 and TPS43351-Q1 include two current-mode synchronous buck controllers designed for the
harsh environment in automotive applications. The part is ideally suited for a multi-rail system with low quiescent
requirements, as the part automatically operates in low-power mode (consuming only 30 µA) at light loads. The
part offers protection features such as thermal, soft-start, and overcurrent protection. During short-circuit
conditions of the regulator output, the current through the MOSFETs can be limited for power dissipation by
activation of the current foldback feature. The two independent soft-start inputs allow ramp-up of the output
voltage independently during start-up.
The switching frequency can be programmed over 150 kHz to 600 kHz or synchronized to an external clock in
the same range. Additionally, the TPS43351-Q1 offers frequency-hopping spread-spectrum operation.
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VBAT
Reverse
Battery
MOSFET
Control
VBUCKA
Internal
VREG
RCOSC
External
SYNC
Sync
ENA
ENB
Buck
Enalbe
SSA
VBUCKB
SSA
SoftStart
DLYAB
Figure 1. Typical Application Diagram
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
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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.
Copyright © 2011–2012, Texas Instruments Incorporated