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Microne - ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL

Numéro de référence ME2139
Description ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
Fabricant Microne 
Logo Microne 





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ME2139 fiche technique
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
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