TPS43350-Q1 Datasheet, PDF (1/31 Pages) Texas Instruments – LOW IQ, DUAL SYNCHRONOUS BUCK CONTROLLER

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TPS43350-Q1
TPS43351-Q1
SLVSAR7B – JUNE 2011 – REVISED MAY 2012
LOW I_Q, DUAL SYNCHRONOUS BUCK CONTROLLER
Check for Samples: TPS43350-Q1, TPS43351-Q1
FEATURES
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•2 Qualified for Automotive Applications
• AEC-Q100 Test Guidance With the Following
Results:
– Device Temperature Grade 1: –40°C to
125°C Ambient Operating Temperature
– Device HBM ESD Classification Level H2
– Device HBM CDM Classification Level C2
• Two Synchronous Buck Controllers
• Input Range up to 40 V, (Transients up to 60 V)
• Low-Power Mode I_Q: 30 µA (One Buck On),
35 µA (Two Bucks On)
• Low Shutdown Current I_sh < 4 µA
• Buck Output Range 0.9 V to 11 V
• Programmable Frequency and External
Synchronization Range 150 kHz to 600 kHz
• Separate Enable Inputs (ENA, ENB)
• Frequency Spread Spectrum (TPS43351-Q1)
• Selectable Forced Continuous Mode or
Automatic Low-Power Mode at Light Loads
• Sense Resistor or Inductor DCR Sensing
• Out-of-Phase Switching Between Buck
Channels
• Peak Gate Drive Current 1.5 A
• Thermally Enhanced, 38-Pin HTSSOP (DAP)
PowerPAD™ Package
APPLICATIONS
• Automotive Infotainment, Navigation, and
Instrument Cluster Systems
• Industrial/Automotive Multi-Rail DC Power
Distribution Systems and Electronic Control
Units
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
Internal
VREG
VBUCKA
SYNC
ENA
ENB
SSA
SSA
DLYAB
RCOSC
External
Sync
Buck
Enalbe
SoftStart
VBUCKB
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