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ME2139F Datasheet Preview

ME2139F Datasheet

ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL

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ME2139
ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
STEP-UP SWITCHING REGULATOR
Description
The ME2139 series is a CMOS step-up
switching regulator which mainly consists of a
reference voltage source, an oscillation circuit,
an error amplifier, a phase compensation circuit,
a PWM/PFM switching control circuit. With an
external low-ON-resistance Nch Power MOS,
this product is applicable to applications
requiring high efficiency and high output current.
The ME2139 series switches its operation to the
PFM control circuit whose duty ratio is 15 % with
to the PWM/PFM switching control circuit under
a light load and to prevent decline in the
efficiency by IC operation current.
Selection Guide
Feature
Low voltage operation: Start-up is guaranteed
from 0.9 V(IOUT =1 mA )
Duty ratio: Built-in PWM/PFM switching control
circuit 15 to 78 % .
oscillator frequency1.0MHz
External parts: coil, diode, capacitor, and
transistor
Output voltage range: 1.5V ~6.5 V
Output voltage accuracy±2%
Soft start function: 2 mS.
PACKAGESOT23-5
Typical Application
MP3 players, digital audio players
Digital cameras, GPS, wireless transceiver
Portable devices
V1.0
Page 1 of 11




Microne

ME2139F Datasheet Preview

ME2139F Datasheet

ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL

No Preview Available !

Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com
Pin Configuration
ME2139
TYPE
ME2139F
POSFIX PACKAGE
M5 SOT23-5
SWICHING
TRANSISTOR
External
Transistor
CE
FUNCTION
Yes
VDD
FUNCTION
Yes
FB
FUNCTION
Yes
FEATURE
Ext+FB
Pin information
ME2139F
Pin Number
SOT23-5
1
2
3
4
5
SOT-23-5
Pin Name
Function
FB
VDD
CE
GND
EXT
Feed Back voltage pin
IC power supply pin
Shutdown pin
GND pin
External transistor connection pin
V1.0
Page 2 of 11


Part Number ME2139F
Description ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
Maker Microne
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