ELM93xxxB
CMOS High efficiency PFM step-up DC/DC converter
■Marking
SOT-89
a : the integer digit of the output voltage
Mark
1
2
3
Vout
1.*V
2.*V
3.*V
b : the decimal digit of the output voltage
Mark
0
1
2
3
4
5
6
7
8
9
Vout
*.0V
*.1V
*.2V
*.3V
*.4V
*.5V
*.6V
*.7V
*.8V
*.9V
SOT-23
c, d : 50 to 99 (Assembly lot No.)
■External parts
To design DC/DC converters using ELM93 series, coil, diode, and capacitor are necessary.
(Refer to the standard circuit configuration.)
1) Coil
When choosing choke coil, please select that whose core is not magnetically saturated, DC resistance is
low, and which has sufficient margin for rated current.
For ELM93 series, ELM recommends following coil.
• CM-5/CM-5N (Sumida Electric Co., Ltd.)
2) Diode
When choosing diode, please select that whose forward voltage is small, switching speed is high and which
has sufficient margin for rated current.
For ELM93 series, ELM recommends schottoky diodes.
8-4
ELM-TECH [ ELM Technology Corporation ]
