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