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LSP3105 Datasheet

2A Synchronous Step-Down Converter

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Liteon Semiconductor Corporation
LSP3105
2A Synchronous TDFN3*3-10L Step-Down Converter
FEATURES
High Efficiency - Up to 95%
Low 300µA Quiescent Current
Guaranteed 2A Output Current
1.2MHz Constant Frequency Operation
Internal Synchronous Rectifier Eliminates Schottky
Diode
2.5V to 6V input voltage range
Adjustable Output Voltages From 0.6V to VIN
Fixed Output Voltage Options Available
100% Duty Cycle Low-Dropout Operation
<1µA Shutdown Current
Soft start function
Short circuit protection
Thermal shutdown protection
TDFN3*3-10L Package
GENERAL DESCRIPTION
The LSP3105 is a fixed-frequency current-mode
synchronous PWM step down converter that is capable
of delivering 2A of output current while achieving peak
efficiency of 95%.LSP3105 operates in a 100% Duty
Cycle Low-Dropout Operation, maximizing battery life in
portable applications. The LSP3105 operates with a
fixed frequency of 1.2MHz, allowing the use of small
external components. The LSP3105 is an ideal solution
for applications powered by Li-Ion batteries or other
portable applications that require small board space.
The LSP3105 is available in 1.8V fixed output voltage
and an adjustable output voltage version capable of
generating output voltages from 0.6V to VIN .The
LSP3105 is available in the small TDFN3*3-10L
package.
APPLICATIONS
Microprocessor and DSP core power supplies
Cellular and smart Phones
Wireless and DSL Modems
Portable Instruments
Figure1. Typical Application Circuit and Efficiency
1/8 Rev1.0
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Lite-On

LSP3105 Datasheet Preview

LSP3105 Datasheet

2A Synchronous Step-Down Converter

No Preview Available !

Liteon Semiconductor Corporation
LSP3105
PIN CONFIGURATION
2A Synchronous TDFN3*3-10L Step-Down Converter
(Top View)
PIN DESCRIPTION
PIN NUMBER PIN NAME
PIN FUNCTION
Regulator Enable control input. Drive RUN above 1.2V to turn on the part. Drive
1 EN RUN below 0.6V to turn it off. In shutdown, all functions are disable drawing
1µA supply current. Do not leave RUN floating.
2
IN
Supply Input Pin. Must be closely decoupled to GND, pin2, with a 2.2µF or greater
ceramic capacitor.
3 AIN Analog supply input pin. Provides bias for internal circuitry.
4,6
AGND
Analog Power Ground Pin
Out ( LSP3105-1.8): Output Voltage Feedback Pin. An internal resistive divider
5
FB/Out
divides the output voltage down for comparison to the internal reference voltage.
FB (LSP3105): Feedback Input Pin. Connected FB to the center point of the
external resistor divider. The feedback threshold voltage is 0.6V.
7,8
LX
Power Switch Output. It is the Switch node connection to inductor. This pin
connects to the drains of the internal P-CH and N-CH MOSFET switches.
9,10
PGND
Power Ground Pin
EP Power ground exposed pad. Must be connected to bare copper ground plane.
2/8 Rev1.0
Free Datasheet http://www.datasheet4u.com/


Part Number LSP3105
Description 2A Synchronous Step-Down Converter
Maker Lite-On
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