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参数资料
| 型号： | LSP3103C18D |
| 厂商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 1/6页 |
| 文件大小： | 334K |
| 代理商： | LSP3103C18D |
Liteon Semiconductor Corporation
LSP3103
500mA Synchronous Step-Down Converter
Rev1.2
1/9
APPLICATIONS
Cellular and Smart Phones
PDAs
MP3 Player
Digital Still and Video Cameras
Portable instruments
Microprocessors and DSP Core Supplies
Wireless and DSL Modems
PIN CONFIGURATION
(Top View)
PIN DESCRIPTION
Pin Number
Pin Name
Pin Function
1
RUN
Regulator Enable control input. Drive RUN above 1.5V to turn on the part.
Drive RUN below 0.3V to turn it off. In shutdown, all functions are disable
drawing ＜1A supply current. Do not leave RUN floating.
2
GND
Ground
3
SW
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.
4
VIN
Supply Input Pin. Must be closely decoupled to GND, pin2, with a 2.2F or
greater ceramic capacitor.
5
VFB/VOUT
VFB (LSP3103): Feedback Input Pin. Connected FB to the center point of
the external resistor divider. The feedback threshold voltage is 0.6V.
VOUT (LSP3103-1.2/1.8): Output Voltage Feedback Pin. An internal resistive
divider divides the output voltage down for comparison to the internal
reference voltage.
GENERAL DESCRIPTION
The LSP3103 is a 1.5MHz constant frequency; slope
compensated
current
mode
PWM
step-down
converter. The device integrates a main switch and a
synchronous rectifier for high efficiency without an
external Schottky diode. It is ideal for powering
portable equipment that runs from a single cell
lithium-Ion (Li+) battery. The LSP3103 can supply
500mA of load current from a 2.5V to 6.5V input
voltage. The output voltage can be regulated as low as
0.6V. The LSP3103 can also run at 100% duty cycle for
low dropout operation, extending battery life in portable
system. Idle mode operation at light loads provides
very low output ripple voltage for noise sensitive
applications.
The LSP3103 is offered in a low profile 5-pin, SOT
package, and is available in an adjustable version and
fixed output voltage of 1.2V, 1.8V.
5
4
1
2
3
VIN
VFB/VOUT
SW
GND
Run
FEATURES
High Efficiency : Up to 96%
1.5MHz Constant Switching Frequency
500mA Output Current at VIN=3.6V, VOUT=1.2V,
Integrated Main switch and synchronous rectifier.
No Schottky Diode Required
2.5V to 6.5V Input Voltage Range
Output Voltage as low as 0.6V
100% Duty Cycle in Dropout
Low Quiescent Current : 300A
＜
1A Shutdown Current
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit and Thermal Fault Protection
Space Saving 5-pin SOT23 package
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