TPS55383_16 Datasheet, PDF (1/46 Pages) Texas Instruments – 3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET AND EXTERNAL COMPENSATION

TPS55383, TPS55386
www.ti.com ......................................................................................................................................................................................... SLUS818 – SEPTEMBER 2008
3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
AND EXTERNAL COMPENSATION
FEATURES
1
•23 4.5-V to 28-V Input Range
• Output Voltage 0.8 V to 90% of Input Voltage
• Output Current Up to 3 A
• Two Fixed Switching Frequency Versions:
– TPS55383: 300 kHz
– TPS55386: 600 kHz
• Three Selectable Levels of Overcurrent
Protection (Output 2)
• 0.8-V 1.75% Voltage Reference
• 2.1-ms Internal Soft Start
• Dual PWM Outputs 180° Out-of-Phase
• Ratiometric or Sequential Startup Modes
• Configurable as Dual Output or Two-Channel
Single Output Multiphase for 6 amp Capability
• 85-mΩ Internal High-Side MOSFETs
• Current Mode Control with External
Compensation
• Pulse-by-Pulse Overcurrent Protection
• Thermal Shutdown Protection at +148°C
• 16-Pin PowerPAD™ HTSSOP package
APPLICATIONS
• Set Top Box
• Digital TV
• Power for DSP
• Consumer Electronics
CONTENTS
Device Ratings
2
Electrical Characteristics
4
Device Information
10
Application Information
13
Design Examples
30
Additional References
39
DESCRIPTION
The TPS55383 and TPS55386 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
and soft start time, these converters provide many
features with a minimum of external components. The
outputs of the two error amplifiers are accessible
allowing user optimization of the feedback loop under
a wide range of output filter characteristics.
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
configured to allow either ratiometric or sequential
startup sequencing. Additionally, the two outputs may
be powered from different sources.
V_IN
OUTPUT1
TPS55383
1 PVDD1 PVDD2 16
2 BOOT1 BOOT2 15
3 SW1
SW2 14
4 GND
BP 13
5 EN1
SEQ 12
6 EN2
ILIM2 11
7 FB1
FB2 10
8 COMP1 COMP2 9
OUTPUT2
UDG-08045
1
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.
2
All other trademarks are the property of their respective owners.
3
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 © 2008, Texas Instruments Incorporated