1

FEATURES

CONTENTS

DESCRIPTION

APPLICATIONS

1

2

3

4

16

15

14

13

PVDD2

BOOT2

SW2

BP

PVDD1

BOOT1

SW1

GND

TPS55383

5

6

7

12

11

10

SEQ

ILIM2

FB2

EN1

EN2

FB1

OUTPUT1

OUTPUT2

V

IN

UDG-08045

8

9

COMP2

COMP1

TPS55383

,, TPS55386

3-A DUAL NON-SYNCHRONOUS CONVERTER WITH INTEGRATED HIGH-SIDE MOSFET

AND EXTERNAL COMPENSATION

23

• 4.5-V to 28-V Input Range

Device Ratings

2

• Output Voltage 0.8 V to 90% of Input Voltage

Electrical Characteristics

4

Device Information

10

• Output Current Up to 3 A

Application Information

13

• Two Fixed Switching Frequency Versions:

Design Examples

30

–

TPS55383: 300 kHz

Additional References

39

–

TPS55386: 600 kHz

• Three Selectable Levels of Overcurrent

Protection (Output 2)

The TPS55383 and TPS55386 are dual output,

• 0.8-V 1.75% Voltage Reference

non-synchronous

buck

converters

capable

of

• 2.1-ms Internal Soft Start

supporting 3-A output applications that operate from a

• Dual PWM Outputs 180° Out-of-Phase

4.5-V to 28-V input supply voltage, and require output

voltages between 0.8 V and 90% of the input voltage.

• Ratiometric or Sequential Startup Modes

• Configurable as Dual Output or Two-Channel

With an internally-determined operating frequency

Single Output Multiphase for 6 amp Capability

and soft start time, these converters provide many

features with a minimum of external components. The

• 85-mΩ Internal High-Side MOSFETs

outputs of the two error amplifiers are accessible

• Current Mode Control with External

allowing user optimization of the feedback loop under

Compensation

a

wide

range

of

output

filter

characteristics.

• Pulse-by-Pulse Overcurrent Protection

Channel 1 overcurrent protection is set at 4.5 A, while

Channel 2 overcurrent protection level is selected by

• Thermal Shutdown Protection at +148°C

connecting a pin to ground, to BP, or left floating. The

• 16-Pin PowerPAD™ HTSSOP package

setting levels are used to allow for scaling of external

components for applications that do not need the full

load capability of both outputs.

• Set Top Box

The outputs may be enabled independently, or

• Digital TV

configured to allow either ratiometric or sequential

• Power for DSP

startup sequencing. Additionally, the two outputs may

be powered from different sources.

• Consumer Electronics

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.

2

PowerPAD is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.