The TD1591 is a 380 KHz fixed frequency monolithic
step down switch mode regulator with a built in internal
Power MOSFET. It achieves 2A 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 function, an over
current protection function and a short circuit protection
function are built inside. An internal compensation block
is built in to minimize external component count.
The TD1591 serves as ideal power supply units for
portable devices.
2A Constant Output Current
80mΩ R
DSON
Internal Power PMOSFET Switch
Up to 95% Efficiency
Fixed 380KHz Frequency
Wide 3.6V to32V Input Voltage Range
Output Adjustable from 1.222V to 30V
Built in Frequency Compensation
Built in Thermal Shutdown Function
Built in Current Limit Function
SOP-8 Package is Available
The minimum dropout up to 0.3V
Applications
Portable DVD
LCD Monitor / TV
Battery Charger
ADSL Modem
Telecom / Networking Equipment
Package Types
Figure 1. Package Types of TD1591
December, 23, 2009.
Techcode Semiconductor Limited
www.techcodesemi.com
1
T
echcode
®
2A 380KHz 32V PWM Buck DC/DC Converter
DATASHEET
TD1591
Pin Configurations
Figure 2 Pin Configuration of TD1591 (Top View)
Pin Description
Pin Number
Pin Name
Description
1,6, 8
2
3
NC
Vin
SW
Not Connect.
Supply Voltage Input Pin. TD1591 operates from a 3.6V to 32V DC voltage.
Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.
Power Switch Output Pin. SW is the switch node that supplies power to the
output.
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 noise into TD1591.
Feedback Pin. Through an external resistor divider network, FB senses the
output voltage and regulates it. The feedback threshold voltage is 1.222V.
Enable Pin. EN is a digital input that turns the regulator on or off .Drive EN pin
high to turn on the regulator, drive it low to turn it off.
4
GND
5
7
FB
EN
December, 23, 2009.
Techcode Semiconductor Limited
www.techcodesemi.com
2
T
echcode
®
2A 380KHz 32V PWM Buck DC/DC Converter
TD1591
□
□
DATASHEET
TD1591
Ordering Information
Circuit Type
Packing:
Blank：Tube
R:Type and Reel
Package
P:SOP8
Function Block
Figure 3 Function Block Diagram of TD1591
December, 23, 2009.
Techcode Semiconductor Limited
www.techcodesemi.com
3
T
echcode
®
2A 380KHz 32V PWM Buck DC/DC Converter
DATASHEET
TD1591
Absolute Maximum Ratings
Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device
at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
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