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MM1331A

Step-Up DC/DC Converter (VFF)

Mitsumi 

MITSUMI

Step-Up DC/DC Converter MM1331

Step-Up DC/DC Converter (VFF)

Monolithic IC MM1331

Outline

This is a converter IC which steps up the DC input voltage to output a fixed voltage level. Utilizing technology

for low-voltage operation, which is a feature of Mitsumi semiconductor processes, operation is possible

beginning at 0.85V, making this device ideal for the power supply circuits of portable equipment driven by a

single battery.

Under small load currents oscillation is stopped and the charge stored in an externally mounted capacitor is

output in an intermittent oscillation design, to improve the efficiency of operation under light loads.

Features

1. Low-voltage operation possible, 0.85V (no-load)

2. Internal oscillation circuit

3. Intermittent oscillation design for improved light-load efficiency

4. Numerous output voltages available (seven ranks)

Package

SOT-25

Output Voltage Rank

Rank

ABCDEGH

Voltage (V) 5.0 3.2 3.5 3.0 2.5 2.2 2.7

Applications

1. Pagers

2. Separate vibrators

3. Other portable equipment

Pin Assignment

5

4

1 23

SOT-25

1

GND

2

SUB

3

VL

4

VOUT

5

VIN

*Pin 2 is the SUB pin, and should be connected to GND.

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