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FAN5331 데이터시트 PDF




Fairchild Semiconductor에서 제조한 전자 부품 FAN5331은 전자 산업 및 응용 분야에서
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부품번호 FAN5331 기능
기능 1.6MHz Boost Converter with 20V Integrated FET Switch
제조업체 Fairchild Semiconductor
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FAN5331 데이터시트, 핀배열, 회로
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




FAN5331 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics
TA = 25°C, Test Circuit Figure 3, unless otherwise noted.
Output Voltage vs Input Voltage
14.98
Maximum Load Current vs Input Voltage
350
14.96
14.94
14.92
14.90
14.88
VIN(V) vs VOUT(V) at Iload=0mA
VIN(V) vs VOUT(V), at load=10mA
VIN(V) vs VOUT(V), at load=20mA
VIN(V) vs VOUT(V) at Iload=30mA
VIN(V) vs VOUT(V) at Iload=40mA
VIN(V) vs VOUT(V) at Iload=50mA
14.86
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
300
250
200
150
100
50
0
2.5
= 12V
V OUT
= 15V
V OUT
= 21V
VOUT
3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Efficiency vs Input Voltage
0.92
0.90
0.88
0.86
0.84
0.82
0.80
0.78
0.76
0.74
VIN(V) vs Efficiency at Iload =10mA
VIN(V) vs Efficiency at Iload =20mA
VIN(V) vs Efficiency at Iload =30mA
VIN(V) vs Efficiency at Iload =40mA
VIN(V) vs Efficiency at Iload =50mA
0.72
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
6.0
Supply Current vs Input Voltage
3.0
2.5 IOUT = 0mA
2.0 Switching
1.5
Non Switching
1.0
0.5
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
Feedback Voltage vs Ambient Temperature
1.25 IOUT = 15mA
1.24
1.23
1.22
1.21
-50
Temperature (°C) vs Vf (Vin=2.7V, Iload=15mA)
Temperature (°C) vs Vf (Vin=3.6V, Iload=15mA)
Temperature (°C) vs Vf (Vin=5.5V, Iload=15mA)
0 50 100
Ambient Temperature (ºC)
150
Switching Frequency vs Ambient Temperature
1 .8 IOUT = 15mA
VOUT = 15V
VIN = 3.6V
1.6
1.4
1.2
1.0
-40 -20
0 20 40 60 80 100 120 140
Ambient Temperature (ºC)
4 www.fairchildsemi.com
FAN5331 Rev. 1.0.1

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FAN5331 전자부품, 판매, 대치품
discontinuous conduction mode due to the automatic turn-off of
the switching transistor, resulting in higher ripple and reduced
efficiency.
Some recommended inductors are suggested in the table
below:
Inductor
Value Vendor Part Number Comment
10µH
Panasonic ELL6GM100M
Lower Profile
(1.6mm)
10µH
Murata LQS66SN100M03L Highest
Efficiency
10µH
Coilcraft DO1605T-103Mx Small Size
Table 1: Recommended Inductors
Capacitors Selection
For best performance, low ESR input and output capacitors are
required. Ceramic capacitors in the range 4.7µF to 10µF, placed
as close to the IC pins, are recommended for the lower input
and output ripple. The output capacitor voltage rating should be
according to the VOUT setting.
A feed forward capacitor CF, is required for stability. The recom-
mended value (R1 x CF) is around 18µS. Some capacitors are
suggested in the table below.
Capacitor
Value
Vendor
Part Number
4.7µF
Panasonic
ECJ3YB1C475K
4.7µF
Murata
GRM31CR61C475
Table 2: Recommended Capacitors
Diode Selection
The external diode used for rectification is usually a Schottky
diode. Its average forward current and reverse voltage maxi-
mum ratings should exceed the load current and the voltage at
the output of the converter respectively. A barrier Schottky diode
such as BAT54 is preferred, due to its lower reverse current over
the temperature range.
Care should be taken to avoid any short circuit of VOUT to GND,
even with the IC disabled, since the diode can be instantly dam-
aged by the excessive current.
Thermal Shutdown
When the die temperature exceeds 150°C, a reset occurs and
will remain in effect until the die cools to 130°C, at that time the
circuit will be allowed to restart.
PCB Layout Recommendations
The inherently high peak currents and switching frequency of
power supplies require careful PCB layout design. Therefore,
use wide traces for high current paths and place the input
capacitor, the inductor, and the output capacitor as close as
possible to the integrated circuit terminals. The resistor divider
that sets the output voltage should be routed away from the
inductor to avoid RF coupling. A four layer PCB with at least one
ground plane connected to the pin 2 of the IC is recommended.
This ground plane acts as an electromagnetic shield to reduce
EMI and parasitic coupling between components.
Figure 5. Recommended Layout
Application Examples
1. LED Driver
One or more serial LED strings can be driven with a constant
current, set by the series resistor, given by
ILED
=
1----.--2---3----V--
R1
VIN 2.7V to 5.5V
CIN
4.7µF
5
V
IN
L
10µH
SW 1
BAT54
4.7µF
COUT
3
FB
VOUT
ON
OFF
4
SHDN
2
GND
R1 R2
Figure 6. Low Noise Boost LED Driver
LED Current vs Input Voltage
(String Connected to FB Pin)
20.2
20.1
20.0
19.9
19.8
19.7
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage (V)
7 www.fairchildsemi.com
FAN5331 Rev. 1.0.1

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