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ISL97519A Datasheet(PDF) 3 Page - Intersil Corporation

Part No. ISL97519A
Description  600kHz/1.2MHz PWM Step-Up Regulator
Download  9 Pages
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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ISL97519A Datasheet(HTML) 3 Page - Intersil Corporation

   
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3
FN6683.2
June 30, 2008
Block Diagram
Typical Application Circuit
COMPARATOR
OSCILLATOR
SHUTDOWN
AND START-UP
CONTROL
LX
VDD
FSEL
EN
SS
REFERENCE
GENERATOR
PWM LOGIC
CONTROLLER
FET
DRIVER
CURRENT
SENSE
GM
AMPLIFIER
GND
FB
COMP
Pin Descriptions
PIN NUMBER
PIN NAME
DESCRIPTION
1
COMP
Compensation pin. Output of the internal error amplifier. Capacitor and resistor from COMP pin to ground.
2
FB
Voltage feedback pin. Internal reference is 1.24V nominal. Connect a resistor divider from VOUT.
VOUT = 1.24V (1 + R1/R2). See “Typical Application Circuit” on page 3.
3
EN
Shutdown control pin. Pull EN low to turn off the device.
4
GND
Analog and power ground.
5
LX
Power switch pin. Connected to the drain of the internal power MOSFET.
6
VDD
Analog power supply input pin.
7
FSEL
Frequency select pin. When FSEL is set low, switching frequency is set to 620kHz. When connected to
high or VDD, switching frequency is set to 1.25MHz.
8
SS
Soft-start control pin. Connect a capacitor to control the converter start-up.
1
2
3
4
8
7
6
5
COMP
FB
EN
GND
SS
FSEL
VDD
LX
+
+
1k
Ω
4.7nF
27nF
22µF
C4
C1
0.1µF
10µH
D1
22µF
C3
12V
2.3V TO 5.5V
R3
C5
85.2k
Ω
R1
10k
Ω
R2
C2
S1
C5
OPEN
ISL97519A


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