TPS54283_17 Datasheet, PDF (1/55 Pages) Texas Instruments – 2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET

TPS54283, TPS54286
www.ti.com
SLUS749C – JULY 2007 – REVISED OCTOBER 2007
2-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET
FEATURES
1
•23 4.5-V to 28-V Input Range
• Output Voltage Range 0.8 V to 90% of Input
Voltage
• Output Current Up to 2 A
• Two Fixed Switching Frequency Versions:
– TPS54283: 300 kHz
– TPS54286: 600 kHz
• Two 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
• 100-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
APPLICATIONS
• Set Top Box
• Digital TV
• Power for DSP
• Consumer Electronics
CONTENTS
Device Ratings
2
Electrical Characteristics
3
Device Information
9
Application Information
12
Design Examples
32
Additional References
44
DESCRIPTION
TPS54283 and TPS54286 are dual output
non-synchronous buck converters capable of
supporting 2-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 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 3 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 not needing 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
also be powered from different sources.
V_IN
OUTPUT1
TPS54283
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-07006
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 © 2007, Texas Instruments Incorporated