TPS54383_15 Datasheet, PDF (1/56 Pages) Texas Instruments – TPS5438x Dual 3-A Non-Synchronous Converters With Integrated High-Side MOSFET

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TPS54383, TPS54386
SLUS774C – AUGUST 2007 – REVISED DECEMBER 2014
TPS5438x Dual 3-A Non-Synchronous Converters With Integrated High-Side MOSFET
1 Features
•1 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
2 Applications
• Set Top Box
• Digital TV
• Power for DSP
• Consumer Electronics
3 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 ratio-metric or sequential
startup sequencing. Additionally, the two outputs may
be powered from different sources.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54383
TPS54386
HTSSOP (14)
4.40 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
V_IN
OUTPUT1
TPS54383
1 PVDD1 PVDD2 14
2 BOOT1 BOOT2 13
3 SW1
SW2 12
4 GND
BP 11
5 EN1
SEQ 10
6 EN2
ILIM2 9
7 FB1
FB2 8
GND
OUTPUT2
UDG-07123
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.