TPS43333-Q1 Datasheet, PDF (1/42 Pages) Texas Instruments – LOW IQ, SINGLE BOOST, DUAL SYNCHRONOUS BUCK CONTROLLER

TPS43333-Q1
www.ti.com
SLVSB48B – AUGUST 2012 – REVISED APRIL 2013
LOW I_Q, SINGLE BOOST, DUAL SYNCHRONOUS BUCK CONTROLLER
Check for Samples: TPS43333-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 CDM ESD Classification Level C2
• Two Synchronous Buck Controllers
• One Pre-Boost Controller
• Input Range up to 40 V, (Transients up to 60
V), Operation Down to 2 V When Boost is
Enabled
• 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
• Boost Output Selectable: 7 V, 10 V, or 11 V
• Programmable Frequency and External
Synchronization Range 150 kHz to 600 kHz
• Separate Enable Inputs (ENA, ENB)
• 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 Start-Stop, Infotainment,
Navigation Instrument Cluster Systems
• Industrial and Automotive Multi-Rail DC Power
Distribution Systems and Electronic Control
Units
DESCRIPTION
The TPS43333-Q1 includes two current-mode synchronous buck controllers and a voltage-mode boost controller.
The device is ideal for use as a pre-regulator stage with low Iq requirements and for applications that must
survive supply drops due to cranking events. The integrated boost controller allows the device to operate down to
2 V at the input without seeing a drop on the buck-regulator output stages. At light loads, one can enable the
buck controllers to operate automatically in low-power mode, consuming just 30 µA of quiescent current.
The buck controllers have independent soft-start capability and power-good indicators. Current foldback in the
buck controllers and cycle-by-cycle current limitation in the boost controller provide external MOSFET protection.
The switching frequency is programmable over 150 kHz to 600 kHz or can synchronize to an external clock in
the same range.
VBAT
VBuckA
TPS43333-Q1
VBuckB
2V
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 © 2012–2013, Texas Instruments Incorporated