1

FEATURES

DESCRIPTION

APPLICATIONS

TYPICAL APPLICATION

50

60

70

80

90

100

0

0.5

1

1.5

2

2.5

3

LoadCurrent- A

V

=8V

V

=12V

V

=16V

IN

IN

IN

V

=5V

OUT

1

2

3

4

8

7

6

5

VDD

ISNS

GDRV

GND

RC

SS

COMP

FB

TPS40200

R

SENSE

V

IN

V

OUT

R1

R2

L1

C2

D1

C1

C3

C4

C5

C6

R4

R3

R5

Q1

TPS40200

WIDE INPUT RANGE NON-SYNCHRONOUS VOLTAGE MODE CONTROLLER

• Input Voltage Range 4.5 to 52 V

• Output Voltage (700 mV to 90% V

The

TPS40200

is

a

flexible

non-synchronous

controller with a built in 200-mA driver for P-channel

• 200 mA Internal P-Channel FET Driver

FETs. The circuit operates with inputs up to 52 V with

• Voltage Feed-Forward Compensation

a power-saving feature that turns off driver current

• Undervoltage Lockout

once the external FET has been fully turned on. This

feature extends the flexibility of the device, allowing it

• Programmable Fixed Frequency (35–500 kHz)

to operate with an input voltage up to 52 V without

Operation

dissipating excessive power. The circuit operates with

• Programmable Short Circuit Protection

voltage-mode

feedback

and

has

feed-forward

• Hiccup Overcurrent Fault Recovery

input-voltage compensation that responds instantly to

input voltage change. The integral 700-mV reference

• Programmable Closed Loop Soft Start

is trimmed to 2%, providing the means to accurately

• 700 mV 1% Reference Voltage

control low voltages. The TPS40200 is available in

• External Synchronization

and 8-pin SOIC and an 8-pin QFN package and

supports many of the features of more complex

• Small 8-Pin SOIC (D) and QFN (DRB) Packages

controllers.

Clock

frequency,

soft-start,

and

overcurrent limit are each easily programmed by a

single,

external

component.

The

part

has

• Industrial Control

undervoltage lockout, and can be easily synchronized

• Distributed Power Systems

to other controllers or a system clock to satisfy

• DSL/Cable Modems

sequencing and/or noise-reduction requirements.

• Scanners

Major sections in this data sheet include:

• Telecom

• Specifications

• General Information

• Example Applications

• Design References

Figure 1. 12 V to 5 V Buck Converter with 94% Efficiency

Figure 2. Typical Efficiency of Application Circuit 1

(described in Application 1)

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2006–2008, 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.