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PDF FAN5331 Datasheet ( Hoja de datos )

Número de pieza FAN5331
Descripción 1.6MHz Boost Converter with 20V Integrated FET Switch
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo

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FAN5331 Hoja de datos, Descripción, Manual
October 2004
FAN5331
1.6MHz Boost Converter with 20V Integrated FET Switch
Features
1.6MHz Switching Frequency
Low Noise
Low RDS(ON): 0.5
Adjustable Output Voltage
1A Peak Switch Current
Low Shutdown Current: <1µA
Cycle-by-Cycle Current Limit
Over-Voltage Protection
Fixed -Frequency PWM Operation
Internal Compensation
5-lead SOT-23 Package
Applications
Cell Phones
PDAs
Handheld Equipment
Display Bias
LED Bias
Typical Application
Description
The FAN5331 is a general purpose, fixed-frequency boost con-
verter designed to operate at high switching frequencies in
order to minimize switching noise measured at the battery ter-
minal of hand-held communications equipment. Quiescent cur-
rent in normal mode of operation as well as in shutdown mode
is designed to be minimal in order to extend battery life. Normal
mode of operation or shutdown mode can be selected by a logic
level shutdown circuitry.
The low ON-resistance of the internal N-channel switch ensures
high efficiency and low power dissipation. A cycle-by-cycle cur-
rent limit circuit keeps the peak current of the switch below a
maximum value of 1A. The FAN5331 is available in a 5-lead
SOT-23 package.
VIN 2.7V to 5.5V
CIN
4.7µF
5
VIN
L
10µH
SW 1
BAT54
R1
VOUT
COUT
4.7µF
CF
120pF
3
FB
ON
OFF
4 SHDN
2
GND
R2
Figure 1. Typical Application Diagram
©2004 Fairchild Semiconductor Corporation
FAN5331 Rev. 1.0.1
1
www.fairchildsemi.com

1 page

FAN5331 pdf
Typical Performance Characteristics (Contd.)
TA = 25°C, Test Circuit Figure 3, unless otherwise noted.
Startup After Enable
Line Transient Response
RL = 300
VIN = 3V
VOUT = 15V
IOUT = 30mA
Tr = Tf = 10µS
VOUT = 15V
VIN = 4.2V
VIN = 3.2V
+0.6V
Inductor Current= 0mA
Time (200µs/div)
Load Transient Response
-0.6V
Time (100µs/div)
Output Power Spectral Density
VIN = 3.6V
IOUT = 35mA
Tr = Tr = <1µS
VOUT = 15V
IOUT = 0 to 35mA
Time (20µs/div)
5 www.fairchildsemi.com
FAN5331 Rev. 1.0.1

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