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
1
3
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
V
OUT
5
V
IN
*
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.
MITSUMI
Step-Up DC/DC Converter MM1331
Electrical Characteristics
(Except where noted otherwise, V
IN
=1.5V, I
O
=1mA)
Item
Measurement conditions
Min. Typ. Max. Units
Operating voltage
No-load
0.85
V
OUT
V
Output voltage rank A
4.80
5.0
5.20
rank B
3.07
3.2
3.33
rank C
3.36
3.5
3.64
rank D
V
IN
=1.5V, Io=1mA
2.88
3.0
3.12
V
rank E
2.40
2.5
2.60
rank G
2.11
2.2
2.29
rank H
2.59
2.7
2.81
Output voltage temperature coefficient
Ta=-20~75C
100
PPM/C
Input fluctuations
V
IN
=1.1 1.7V, Io=1mA
3
%/C
Load fluctuations
V
IN
=1.5V, Io=0 7mA
1
%/mA
V
IN
pin consumption current
V
IN
=1.5V, V
OUT
=V
OUT
max.+0.05
3
4.5
A
V
OUT
pin consumption current
V
OUT
=V
OUT
max.+0.05
5
7.5
A
V
L
pin leakage current
V
L
=10V
1
A
Output ripple voltage
V
IN
=1.5V, Io=1mA
60
120
mV
Oscillation frequency
V
IN
=1.5V
70
115
185
kHz
Note: Electrical characteristics assume use of the following externally
mounted components.
Coil
Mitsumi model C5-R
L=120H
Capacitor
tantalum electrolytic
C=33F
SBD
Rohm model RB451F
Application Circuits
Note: Coil: L = 120H (Mitsumi model C5-R)
Capacitor : C=33F (tantalum electrolytic capacitor)
Schottky barrier diode (Rohm model RB451F)
MITSUMI
Step-Up DC/DC Converter MM1331
Tek Stop : 100kS/S
402 Acqs
1
2
Ch1
Ch2
Ch2
2.66V
100V
M
500
S
50.0mV
Characteristics
4
V
OUT
3
2
I
O
=100mA
I
O
=1mA
I
O
=5mA
1
0
0.5
1.0
1.5
V
IN
Input voltage (V)
Output voltage (V)
Conditions ;V
IN
=1.5V, Io=1mA
L=120H (C5-R)
C
IN
=C
OUT
=33F (tantalum)
SBD ; RB451F
V
OUT
pin waveform 50mV/div
500S/div
V
L
pin waveform 1V/div
*
The above characteristics are representative, and are not guaranteed values.
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