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TPS43000PW-TPS43000PWR-TPS43000PWRG4
Multi-Topology High Frequency PWM Controller
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SLUS489 − OCTOBER 2001
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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
TYPICAL BUCK APPLICATION
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.
UDG−01036
RTN
VIN
VOUT
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