MITSMI MM1331A, MM1331B, MM1331C, MM1331E, MM1331G Datasheet
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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
Applications
1. Pagers
2. Separate vibrators
3. Other portable equipment
Pin Assignment
13
5
2
4
SOT-25
Output Voltage Rank
Rank A B C D E G H
Voltage (V) 5.0 3.2 3.5 3.0 2.5 2.2 2.7
1 GND
2 SUB
3 V
L
4 VOUT
5 VIN
*
Pin 2 is the SUB pin, and should be connected to GND.
MITSUMI
Step-Up DC/DC Converter MM1331
Absolute Maximum Ratings
Block Diagram
Item Symbol Ratings Units
Storage temperature T
STG
-
40~+125 °C
Operating temperature T
OPR
-
20~+75 °C
Voltage applied to V
IN pin
-
0.3~+10 V
Voltage applied to V
OUT pin
-
0.3~+10 V
Voltage applied to V
L pin
-
0.3~+10 V
Allowable loss Pd 150 mW
Recommended Operating Conditions
Item Symbol Ratings Units
Operating temperature Top
-
20~+75 °C
Operating voltage Vop +0.85~V
OUT V
Note: Pin 2 is the SUB pin, and should be connected to GND.
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