ME2149 General Description：
The ME2149 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 internal low-ON-resistance Nch Power MOS, this product is applicable to applications requiring high efficiency and high output current.
The ME2149 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.
ME2149 Features：
Low voltage operation: Start-up is guaranteed from 0.9V(IOUT =1 mA )
Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 % .
oscillator frequency：1.0MHz
Output voltage range：<20V
Feedback voltage accuracy：±2%
Soft start function: 2 mS
ME2149 Applications：
MP3 players, digital audio players
Digital cameras, GPS, wireless transceiver
Portable devices
ME2149 Package：
5-pin SOT23-5、SOT89-5
8-pin SOP8
ME2149 Typical Application Circuit：
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ME2149 Selection Guide：
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product
series
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posfix
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package
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switching
transistor
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CE
function
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VDD
function
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FB
function
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features
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ME2149FxxG
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M5
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SOT23-5
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Build in
Transistor
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Yes
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Yes
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Yes
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LX+FB
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P5
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SOT89-5
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||||||
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SOP8
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SOP8
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ME2149 Pin Assignment：
ME2149 Block Diagram：
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