FEATURES

High-Frequency (2-MHz) Voltage Mode PWM

Controller

1.8-V to 9.0-V Input Voltage Range

0.8-V to 8.0-V Output Voltage Range (Higher in

Non-Synchronous Boost Topology)

High-Efficiency Buck, Boost, SEPIC or

Flyback (Buck-Boost) Topology

Synchronous Rectification for High-Efficiency

Drives External MOSFETs for High-Current

Applications

Synchronizable Fixed-Frequency PWM or

Automatic Pulsed Frequency Modulation

(PFM) Mode

Built-In Soft-Start

User Programmable Discontinuous or

Continuous Conduction Mode

Selectable Pulse-by-Pulse Current Limiting or

Hiccup Mode Protection

APPLICATIONS

Networking Equipment

Servers

Base Stations

Cellular Telephones

Satellite Telephones

GPS Devices

Digital Still and Handheld Cameras

Personal Digital Assistants (PDAs)

DESCRIPTION

The TPS43000 is a high-frequency, voltage-mode,

synchronous PWM controller that can be used in buck,

boost, SEPIC, or flyback topologies. This highly flexible,

full-featured controller is designed to drive a pair of

external MOSFETs (one N-channel and one

P-channel), enabling it for use with a wide range of

output voltages and power levels. With an automatic

PFM mode, a shutdown current of less than 1 μA, a

sleep-mode current of less than 100 μA and a full

operating current of less than 2 mA at 1 MHz, it is ideal

for building highly efficient, dc-to-dc converters.

The TPS43000 operates over a wide input voltage

range of 1.8 V to 9.0 V. Typical power sources are

distributed power systems, two to four nickel or alkaline

batteries, or one to two lithium-ion cells. It can be used

to generate regulated output voltages from as low as

0.8 V to 8 V or higher. It operates either in a

fixed-frequency mode, where the user programs the

frequency (up to 2 MHz), or in an automatic PFM mode.

In the automatic mode, the controller goes to sleep

when the inductor current goes discontinuous, and

wakes up when the output voltage has fallen by 2%. In

this hysteretic mode of operation, very high efficiency

can be maintained over a very wide range of load

current. The device can also be synchronized to an

external clock source using the dual function SYNC/SD

input pin.