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.
2.
3.
4.
Low-voltage operation possible, 0.85V (no-load)
Internal oscillation circuit
Intermittent oscillation design for improved light-load efficiency
Numerous output voltages available (seven ranks)
Package
SOT-25
Output Voltage Rank
Rank
Voltage (V)
A
5.0
B
3.2
C
3.5
D
3.0
E
2.5
G
2.2
H
2.7
Applications
1. Pagers
2. Separate vibrators
3. Other portable equipment
Pin Assignment
1
2
5
4
3
4
1
2
3
5
GND
SUB
V
L
V
OUT
V
IN
SOT-25
*
Pin 2 is the SUB pin, and should be connected to GND.
MITSUMI
Step-Up DC/DC Converter MM1331
Block Diagram
Note: Pin 2 is the SUB pin, and should be connected to GND.
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Voltage applied to V
IN
pin
Voltage applied to V
OUT
pin
Voltage applied to V
L
pin
Allowable loss
Pd
Symbol
T
STG
T
OPR
Ratings
-40~+125
-20~+75
-0.3~+10
-0.3~+10
-0.3~+10
150
Units
°C
°C
V
V
V
mW
Recommended Operating Conditions
Item
Operating temperature
Operating voltage
Symbol
Top
Vop
Ratings
-20~+75
+0.85~V
OUT
Units
°C
V
MITSUMI
Step-Up DC/DC Converter MM1331
Electrical Characteristics
Item
Operating voltage
Output voltage rank A
rank B
rank C
rank D
rank E
rank G
rank H
(Except where noted otherwise, V
IN
=1.5V, I
O
=1mA)
Measurement conditions
No-load
Min. Typ. Max. Units
0.85
4.80
3.07
3.36
V
IN
=1.5V, Io=1mA
2.88
2.40
2.11
2.59
Ta=-20~75°C
V
IN
=1.1
1.7V, Io=1mA
7mA
3
5
60
70
115
V
IN
=1.5V, Io=0
5.0
3.2
3.5
3.0
2.5
2.2
2.7
±100
3
1
4.5
7.5
1
120
185
V
OUT
5.20
3.33
3.64
3.12
2.60
2.29
2.81
PPM/°C
%/°C
%/mA
µA
µA
µA
mV
kHz
V
V
Output voltage temperature coefficient
Input fluctuations
Load fluctuations
V
IN
pin consumption current
V
OUT
pin consumption current
V
L
pin leakage current
Output ripple voltage
Oscillation frequency
V
IN
=1.5V, V
OUT
=V
OUT
max.+0.05
V
OUT
=V
OUT
max.+0.05
V
L
=10V
V
IN
=1.5V, Io=1mA
V
IN
=1.5V
Note: Electrical characteristics assume use of the following externally
mounted components.
Coil
Capacitor
SBD
Mitsumi model C5-R
tantalum electrolytic
Rohm model RB451F
L=120µH
C=33µF
Application Circuits
Note: Coil: L = 120µH (Mitsumi model C5-R)
Capacitor : C=33µF (tantalum electrolytic capacitor)
Schottky barrier diode (Rohm model RB451F)
MITSUMI
Step-Up DC/DC Converter MM1331
Characteristics
Tek Stop : 100kS/S
402 Acqs
Conditions ;V
IN
=1.5V, Io=1mA
L=120µH (C5-R)
C
IN
=C
OUT
=33µF (tantalum)
SBD ; RB451F
1
V
OUT
pin waveform 50mV/div
500µS/div
V
L
pin waveform 1V/div
2
Ch1 50.0mV
Ch2
100V
M
500µS Ch2
2.66V
V
OUT
4
Output voltage (V)
3
I
O
=100mA
2
I
O
=1mA
I
O
=5mA
1
0
0.5
1.0
Input voltage (V)
1.5
V
IN
*
The above characteristics are representative, and are not guaranteed values.
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