CMOS High efficiency PFM step-up DC/DC converter
ELM93xxxB
■Pin configuration
SOT-89 (TOP VIEW)
SOT-23 (TOP VIEW)
Pin No.
Pin name
VSS
VOUT
LX
Pin No.
Pin name
VSS
LX
VOUT
1
2
3
1
2
3
■Standard circuit
᎔ᎈ፹፸
፺፺፷ᕈᎏ
᎓
᎖
ᎰᎵ
ᎌ᎓᎔ᎀ፺ᎿᎿᎿᎉ
ᎶᎼᎻ
፲
፲
ᎊᎰᎵ
፹፹ᕈᎍ
ᎊᎶᎼᎻ
፹፹ᕈᎍ
Cin :
The circuit can operate without Cin, but adding Cin to the circuit can lower the feed-
back noise to the Input; this method is also effective in improving efficiency because
input voltage drop during switching can be eased. Under the condition of Iout≤10mA,
please connect tantalum capacitor of 10μF to 47μF to a coil as close as possible.
■Block diagram
᎗፵ᎍ፵᎔፵፧፧᎖ᎊ
᎓
᎖
፲
፴
ᎹᎬᎭ
ᎻᎨᎹᎻ፴ᎼᎷ
8 - 2
ELM-TECH [ ELM Technology Corporation ]
