MITSUMI
Step-Up DC/DC Converter (PWM) MM1349
Step-Up DC/DC Converter (PWM)
Monolithic IC MM1349
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 0.90V, making this device ideal for the power supply circuits of portable equipment driven by a
single battery.
Because PWM oscillation is adopted, an output waveform can be obtained with a smaller peak-to-peak
voltage than is possible for VFM devices.
Features
1.
2.
3.
4.
Low-voltage operation possible,
0.90V (no-load)
Internal oscillation circuit
Adoption of PWM oscillation for output waveform with small peak-to-peak voltage
Numerous output voltages available (seven ranks)
Package
SOT-25
Output Voltage Rank
Rank
Voltage (V)
A
5.0
B
3.5
C
3.2
D
3.0
E
2.7
G
2.5
H
2.2
Applications
1. Pagers
2. Separate vibrators
3. Other portable equipment
Pin Assignment
1
5
4
2
3
1
2
3
4
5
SOT-25
GND
SUB
V
L
V
OUT
V
IN
*
Pin 2 is the SUB pin, and should be connected to GND.
1
2
3
