FAN5330 High Efficiency Serial LED Driver with 30V Integrated Switch
August 2005
FAN5330
High Efficiency Serial LED Driver with 30V Integrated
Switch
Features
■
■
■
■
■
■
■
■
■
■
■
■
1.5MHz Switching Frequency
Low Noise
Adjustable Output Voltage
0.7W Output Power Capability
Low Shutdown Current: <1µA
Cycle-by-Cycle Current Limit
Low Feedback Voltage (110mV)
Over-Voltage Protection
Fixed-Frequency PWM Operation
Internal Compensation
Thermal Shutdown
5-Lead SOT23 Package
Description
The FAN5330 is an LED driver that features fixed frequency
mode operation and an integrated FET switch. This device is
designed to operate at high switching frequencies in order to
minimize switching noise measured at the battery terminal of
hand-held communications equipment. Quiescent current in
both normal and shutdown mode is designed to be minimal in
order to extend battery life. Normal 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
typical value of 1.5A. The FAN5330 is available in a 5-lead
SOT23 package.
Applications
■
Cell Phones
■
PDAs
■
Handheld Equipment
■
Display Bias
■
LED Bias
Typical Application
BAT54
C
OUT
0.47µF
I
LED
5
V
IN
V
IN
C
IN
2.2µF
L
6.8µH
to 10µH
V
OUT
SW
1
FAN5330
FB
3
ON
OFF
4
SHDN
GND
2
R
Figure 1. Typical Application Diagram
©2005 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FAN5330 Rev. 1.0.1
FAN5330 High Efficiency Serial LED Driver with 30V Integrated Switch
Pin Assignment
Top View
SW
GND
FB
SHDN
V
IN
5-Lead SOT-23
Figure 2. Pin Assignment
Pin Description
Pin No.
1
2
3
4
5
Pin Name
SW
GND
FB
SHDN
V
IN
Switching Node.
Analog and Power Ground.
Pin Description
Feedback Pin.
Feedback node that connects to an external current set resistor.
Shutdown Control Pin.
Logic HIGH enables, logic LOW disables the device.
Input Voltage Pin.
2
FAN5330 Rev. 1.0.1
www.fairchildsemi.com
FAN5330 High Efficiency Serial LED Driver with 30V Integrated Switch
Absolute Maximum Ratings
(
Note1)
Parameter
V
IN
to GND
FB, SHDN to GND
SW to GND
Lead Soldering Temperature (10 seconds)
Junction Temperature
Storage Temperature
Thermal Resistance (
Θ
JA
)
Electrostatic Discharge Protection (ESD) Level (Note 2)
HBM
CDM
2
1
-55
-0.3
-0.3
Min.
Max.
6.0
V
IN
+ 0.3
35
300
150
150
210
Unit
V
V
V
°C
°C
°C
°C/W
KV
Recommended Operating Conditions
Parameter
Input Voltage
Output Voltage
Operating Ambient Temperature
Output Capacitance Rated at the Required Output (Note 3)
Min.
1.8
V
IN
-40
0.1
Typ.
Max.
5.5
30
Unit
V
V
°C
µF
25
85
Notes:
1. Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those indicated in the operational section
of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability. Absolute maximum ratings apply individually only, not in combination.
2. Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
3. This load capacitance value is required for the loop stability. Tolerance, temperature variation, and voltage dependency of the
capacitance must be considered. Typically a 0.47µF ceramic capacitor is required to achieve specified value at V
OUT
= 30V.
3
FAN5330 Rev. 1.0.1
www.fairchildsemi.com
FAN5330 High Efficiency Serial LED Driver with 30V Integrated Switch
Electrical Characteristics
Unless otherwise noted, V
IN
= 3.6V, I
LED
= 20mA, T
A
= -40°C to 85°C, Typical values are at T
A
= 25°C, Test
Circuit, Figure 3.
Parameter
Feedback Voltage
Switch Current Limit
Load Current Capability
Switch On-resistance
Quiescent Current
OFF Mode Current
Shutdown Threshold
Shutdown Pin Bias Current
Feedback Pin Bias Current
Feedback Voltage Line Regulation
Switching Frequency
Maximum Duty Cycle
Switch Leakage Current
OVP
Thermal Shutdown Temperature
No Switching, V
IN
= 5.5V
15
150
2.7V < V
IN
< 5.5V, V
OUT
≤
20V
1.25
87
V
IN
= 3.2V
V
OUT
≤
20V V
IN
= 3.2V
V
IN
= 5V
V
IN
= 3.6V
V
SHDN
= 3.6V, No Switching
V
SHDN
= 0V
Device ON
Device OFF
V
SHDN
= 0V or V
SHDN
= 5.5V
1
1
0.3
1.5
93
1
1.75
1.5
0.5
300
300
Conditions
Min.
99
1.1
35
Typ.
110
1.5
0.6
0.7
0.6
0.1
Max.
121
Units
mV
A
mA
Ω
Ω
mA
3
µ
A
V
V
nA
nA
%
MHz
%
µ
A
%
°C
Test Circuit
V
IN
C
IN
10µF
5
V
IN
1
L
10µH
1µF
I
LED
BAT54
C
OUT
V
OUT
SW
FAN5330
Electronic Load
FB
3
ON
OFF
4
SHDN
GND
2
R
Figure 3. Test Circuit
4
FAN5330 Rev. 1.0.1
www.fairchildsemi.com
FAN5330 High Efficiency Serial LED Driver with 30V Integrated Switch
Typical Performance Characteristics
T
A
= 25°C, C
IN
= 4.7µF, C
OUT
= 0.47µF, L = 10µH, unless otherwise noted.
LED Current vs Temperature
10.8
SW Frequency vs. Temperature
2.0
V
IN
= 5.5V
10.6
V
IN
= 2.2V
SW Frequency (MHz)
LED Current (mA)
V
OUT
= 15V
V
OUT
= 15V
10.4
10.2
10.0
9.8
9.6
-40
-20
0
20
40
60
80
1.8
V
IN
= 3.6V
V
IN
= 3.6V
1.6
V
IN
= 5.5V
1.4
V
IN
= 2.2V
1.2
-40
-20
0
20
40
60
80
Temperature (°C)
Load Current vs. Input Voltage
25
V
OUT
= 15V
Start-Up Response
L = 10µH
C
IN
= 10µF
C
OUT
= 1µF
V
IN
= 2.7V
Load Current (mA)
20
15
10
5
0
2
3
4
5
Input Voltage (V)
EN
Voltage
(5V/div)
Battery
Current
(0.5A/div)
Output
Voltage
(5V/div)
Time (100µs/div)
Efficiency vs. Input Voltage
100
V
OUT
= 9V
Efficiency vs. Input Voltage
100
V
OUT
= 15V
90
90
Efficiency (%)
80
I
LED
= 35mA
Efficiency (%)
80
I
LED
= 35mA
70
I
LED
= 30mA
I
LED
= 20mA
I
LE
= 10mA
D
70
I
LED
= 30mA
I
LED
= 20mA
I
LED
= 10mA
60
60
50
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
50
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Input Voltage (V)
5
FAN5330 Rev. 1.0.1
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