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SLUS774B – AUGUST 2007 – REVISED OCTOBER 2007
3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
1
FEATURES
CONTENTS
2
3
9
12
32
44
•
4.5-V to 28-V Input Range
•
Output Voltage Range 0.8 V to 90% of Input
Voltage
•
Output Current Up to 3 A
•
Two Fixed Switching Frequency Versions:
– TPS54383: 300 kHz
– TPS54386: 600 kHz
•
Three Selectable Levels of Overcurrent
Protection (Output 2)
•
0.8-V 1.5% Voltage Reference
•
2.1-ms Internal Soft Start
•
Dual PWM Outputs 180° Out-of-Phase
•
Ratiometric or Sequential Startup Modes
Selectable by a Single Pin
•
85-mΩ Internal High-Side MOSFETs
•
Current Mode Control
•
Internal Compensation (See Page 16)
•
Pulse-by-Pulse Overcurrent Protection
•
Thermal Shutdown Protection at +148°C
•
14-Pin PowerPAD™ HTSSOP package
23
DESCRIPTION
The TPS54383 and TPS54386 are dual output,
non-synchronous buck converters capable of
supporting 3-A output applications that operate from a
4.5-V to 28-V input supply voltage, and require output
voltages between 0.8 V and 90% of the input voltage.
With an internally-determined operating frequency,
soft start time, and control loop compensation, these
converters provide many features with a minimum of
external components. Channel 1 overcurrent
protection is set at 4.5 A, while Channel 2 overcurrent
protection level is selected by connecting a pin to
ground, to BP, or left floating. The setting levels are
used to allow for scaling of external components for
applications that do not need the full load capability of
both outputs.
The outputs may be enabled independently, or may
be configured to allow either ratiometric or sequential
startup sequencing. Additionally, the two outputs may
be powered from different sources.
V
IN
APPLICATIONS
•
•
•
•
Set Top Box
Digital TV
Power for DSP
Consumer Electronics
TPS54383
1
2
OUTPUT1
3
4
5
6
7
SW1
GND
EN1
EN2
FB1
GND
UDG-07123
PVDD1
BOOT1
PVDD2 14
BOOT2 13
OUTPUT2
SW2 12
BP 11
SEQ 10
ILIM2
FB2
9
8
1
2
3
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.
All other trademarks are the property of their respective owners.
Copyright © 2007, Texas Instruments Incorporated
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.
TI [ TEXAS INSTRUMENTS ]
