TPS43337-Q1 Datasheet, PDF (1/38 Pages) Texas Instruments – LOW IQ, SINGLE-BOOST, FIXED-VOLTAGE DUAL SYNCHRONOUS BUCK CONTROLLER

TPS43337-Q1
www.ti.com
SLVSBC2A – AUGUST 2013 – REVISED SEPTEMBER 2013
LOW I_Q, SINGLE-BOOST, FIXED-VOLTAGE DUAL SYNCHRONOUS BUCK CONTROLLER
Check for Samples: TPS43337-Q1
FEATURES
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•2 Qualified for Automotive Applications
• AEC-Q100 Qualified 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
• BuckA: Fixed Output Voltage of 3.4 V
• BuckB: Fixed Output Voltage of 1.235 V
• 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: 34 µA (One Buck On), 43
µA (Two Bucks On)
• Low Shutdown Current I_sh < 4 µA
• Boost Output Selectable: 7 V, 8.85 V, or 10 V
• Programmable Frequency and External
Synchronization Range: 150 to 600 kHz
• Separate Enable Inputs (ENA, ENB, ENC)
• Selectable Forced Continuous Mode or
Automatic Low-Power Mode at Light Loads
• Sense Resistor or Inductor DCR Sensing for
Buck Controllers
• 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 TPS43337-Q1 includes two current-mode
synchronous buck controllers and a voltage-mode
boost controller. The device is ideally suited as a pre-
regulator stage with low I_Q requirements and for
systems 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, the buck controllers enable to
operate automatically in low power-mode, consuming
just 34 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 programable over 150 to 600 kHz or is
synchronized to an external clock in the same range
VBAT
VBuckA
TPS43337-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 © 2013, Texas Instruments Incorporated