ELM94xxB CMOS PFM step-up DC/DC converter
■Standard circuit
᎔ᎈ፹፸
፺፺፷ᕈᎏ
᎓
᎖
ᎰᎵ
ᎶᎼᎻ
፹፹ᕈᎍ
ᎌ᎓᎔ᎀ፻ᎿᎿᎉ
፲
■Block diagram
᎗፵ᎍ፵᎔፵
᎓
᎖
፲
፴
ᎹᎬᎭ
᎖ᎺᎪᎰᎳᎳᎨᎻᎶᎹ
ᎻᎨᎹᎻ፴ᎼᎷ
■Electrical characteristics
L=330μH, D=MA721, C=22μF, Vss=0V, Top=25°C
Condition Min. Typ. Max. Unit
Vout=2.7V (ELM9427B)
Parameter
Symbol
Vin
Vst RL=27kΩ
Vhold Iout=1mA
Input voltage
Starting voltage
Holding voltage
10
0.98
0.7
V
V
V
Current consumption
Output voltage
Output current of LX pin
Leakage current of LX pin
Oscillating frequency
Maximum duty ratio
Iss Iout=100μA, Vin=1.5V
Vout Iout=1mA, Vin=1.5V
Ilx Vout=2.6V, Vlx=0.4V
Ilxl Vout=Vlx=10V
Fosc Vout=2.6V
Duty Vout=2.6V, Switch"ON"
3.5
7.0
μA
V
mA
μA
kHz
%
2.63 2.70 2.77
80
1.0
55
65
22
45
35
55
L=330μH, D=MA721, C=22μF, Vss=0V, Top=25°C
Condition Min. Typ. Max. Unit
Vout=3.0V (ELM9430B)
Parameter
Input voltage
Starting voltage
Holding voltage
Symbol
Vin
Vst RL=30kΩ
10
0.98
0.7
V
V
V
Vhold Iout=1mA
Current consumption
Output voltage
Output current of LX pin
Leakage current of LX pin
Oscillating frequency
Maximum duty ratio
Iss Iout=100μA, Vin=1.5V
Vout Iout=1mA, Vin=1.5V
Ilx Vout=2.9V, Vlx=0.4V
Ilxl Vout=Vlx=10V
Fosc Vout=2.9V
Duty Vout=2.9V, Switch"ON"
4.0
8.0
μA
V
mA
μA
kHz
%
2.92 3.00 3.08
90
1.0
55
65
22
45
35
55
6 - 2
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