5A 240KHZ 23V PWM Buck DC/DC Converter TD7590
General Description

The TD7590 is a 240 KHz fixed frequency
molithic step down switch mode regulator
with a built in internal Power MOSFET. It
achieves 5A continuous output current over a
wide input supply range with excellent load
and line regulation.
The device includes a voltage reference,
oscillation circuit, error amplifier, internal
PMOS and etc.

The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 100%. An enable
funion, an over current proteion funion
and a short circuit proteion funion are
built inside. An internal compensation block
is built in to minimize external component
count.

The TD7590 serves as ideal power supply
units for portable devices.

Features

.
5A Constant Output Current
.
80mΩ RDSON Internal Power PMOSFET
Switch
.
Up to 95% Efficiency
.
Fixed 240KHz Frequency
.
Wide 3.6V to 23V Input Voltage Range
.
Output Adjustable from 1.222V to 21V
.
Built in Frequency Compensation
.
Built in Thermal Shutdown Funion
.
Built in Current Limit Funion
.
TO-263 Package is Available
.
The minimum dropout up to 0.3V
.
Applications
.
Portable DVD
.
LCD Monitor / TV
.
Battery Charger
.
ADSL Modem
.
Telecom / Networking Equipment
TO263-5L

Figure 1 Package Te of TD7590

Septeer, 2006 Techcode Semiconduor Limited
1

&sp;Datasheet Datasheet
5A 240KHZ 23V PWM Buck DC/DC Converter TD7590
Pin Configurations

5 ON/OFF
4 Feedback
3 Output
2 Gnd
1 Vin

TO263-5L EXPOSED PAD

ON BACKSIDE
CONNE TO PIN3

Figure 2 Pin Configuration of TD7590 ( View)
Pin Description

Pin Nuer Pin Name Description
1 Vin
Supply Voltage Input Pin. TD7590 operates from a 3.6V to 23V
DC voltage. B Vin to GND with a suitably large capacitor
to eliminate ise on the input.
3 Output Power Switch Output Pin. SW is the switch de that supplies
power to the output.
2 GND
Ground Pin. Care must be taken in layout. This pin should be
placed outside of the Schottky Diode to output capacitor ground
path to prevent switching current spikes from inducing voltage
ise into TD7590.
4 FB
Feedback Pin. Through an external resistor divider network, FB
senses the output voltage and regulates it. The feedback
threshold voltage is 1.222V.
5 EN
Enable Pin. EN is a dial input that turns the regulator on or
off .Drive EN pin high to turn on the regulator, drive it low to
turn it off.

Ordering Information
TD7590

Circuit Te
Package