el7516 Intersil Corporation, el7516 Datasheet - Page 3

• Manufacturer Part Number: el7516
• Description: 600khz/1.2mhz Pwm Step-up Regulator
• Manufacturer: Intersil Corporation

Pin Descriptions
Block Diagram
Typical Application Circuit
PIN NUMBER
1
2
3
4
5
6
7
8
PIN NAME
VDD
COMP
SHDN
FSEL
GND
VDD
FB
SS
LX
4.7nF
3
3.9kΩ
GENERATOR
REFERENCE
C
R
5
3
Compensation pin. Output of the internal error amplifier. Capacitor and resistor from COMP pin to ground.
Voltage feedback pin. Internal reference is 1.294V nominal. Connect a resistor divider from V
1.294V (1 + R
Shutdown control pin. Pull SHDN low to turn off the device.
Analog and power ground.
Power switch pin. Connected to the drain of the internal power MOSFET.
Analog power supply input pin.
Frequency select pin. When FSEL is set low, switching frequency is set to 620kHz. When connected to
high or V
Soft-start control pin. Connect a capacitor to control the converter start-up.
COMPARATOR
COMP
R
1
DD
10kΩ
, switching frequency is set to 1.25MHz.
R
85.2kΩ
2
1
/R
2
OSCILLATOR
). See Typical Application Circuit.
S1
FSEL
1
2
3
4
AMPLIFIER
CURRENT
SENSE
COMP
FB
SHDN
GND
GM
EL7516
CONTROLLER
PWM LOGIC
FSEL
VDD
SS
LX
SHDN
8
7
6
5
AND START-UP
SHUTDOWN
CONTROL
DESCRIPTION
C
27nF
C
0.1µF
SS
3
4
DRIVER
+
FET
C
22µF
1
10µH
D
1
2.7V TO 5.5V
+
C
22µF
2
LX
GND
FB
12V
OUT
October 9, 2007
. V
FN7333.6
OUT
=