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ME2139
ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL
STEP-UP SWITCHING REGULATOR
General Description Features
The ME2139 series is a CMOS step-up Low voltage operation: Start-up is guaranteed from
switching regulator which mainly consists of a 0.9 V(IOUT =1 mA )
reference voltage source, an oscillation circuit, Duty ratio: Built-in PWM/PFM switching control
an error amplifier, a phase compensation circuit, circuit 15 to 78 % .
a PWM/PFM switching control circuit. With an oscillator frequency:1.0MHz
external low-ON-resistance Nch Power MOS, External parts: coil, diode, capacitor, and transistor
this product is applicable to applications requiring Output voltage range:20V
high efficiency and high output current. The Feedback voltage accuracy :±2%
5
ME2139 series switches its operation to the PFM Soft start function: 2 ms
0
control circuit whose duty ratio is 15 % with to the 3
PWM/PFM switching control circuit under a light 3
load and to prevent decline in the efficiency by IC 1
operation current. 5
3
2
8
3
1
:
L
Applications L Package
A ● 5-pin SOT23-5
MP3 players, digital audio players
C
Digital cameras, GPS, wireless transceiver
Portable devices
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