ELM600LA 800mA 1.4MHz
high efficiency synchronous PWM step down DC/DC converter
■Pin configuration
TSOT-25(TOP VIEW)
Pin No.
Pin name
EN
GND
SW
Pin description
Enable control input
Ground
Power switch output
Main supply
5
4
1
2
3
4
5
VIN
FB
1
2
3
Voltage feedback
■Block diagram
Vin
●
Slope Comp
+
_
Shut down
control
Current
sense
EN
●
amplifier
Reference
0.6V
M1
+
_
●
PWM
Logic
FB
Error
amplifier
●
●
PWM
Comparator
SW
M2
Oscillator
Clock
_
+
●
GND
Zero-current
comparator
■Standard circuit
• Adjustable output voltage
Vout
L=2.2µH
●
●
Cout=22µF
4
Vin
R1
3
●
●
VIN
FB
SW
2
1
Cin=10µF
GND
5
R2
EN
Enable
ELM600LA
Vout=0.6×(1+R1/R2)
Vout=3.3V, R1=300KΩ, R2=68KΩ
Vout=1.8V, R1=1MΩ, R2=499KΩ
Rev.1.1
10 - 2