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FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
November 2005
FAN5616
High-Efficiency, Constant-Current LED Driver with
Adaptive Charge Pump
Features
■
3-Channel Parallel LED Driver for a Large Range of
■
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■
■
■
■
■
■
■
■
■
■
■
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■
■
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■
Description
The FAN5616 generates a regulated output current from
a battery with an input voltage between 2.7V to 5.5V.
Switch reconfiguration and fractional switching tech-
niques are utilized to achieve high efficiency over the
entire input voltage range. The adaptive nature of the
built-in charge pump eliminates the need for LED pre-
selection (matching) and ensures operation with high
efficiency. The driver's built-in, proprietary, auto-sense
circuitry ensures the same high efficiency regardless of
the number of LEDs. When the input voltage is suffi-
ciently high to sustain the LED’s programmed current
level, the FAN5616 reconfigures itself to operate as a lin-
ear regulator, and the charge pump is turned off.
The FAN5616 supports both digital and PWM LED
brightness control methods. The built-in 2-bit DAC offers
a selection of four LED current levels, each level is a per-
centage of the maximum LED current set by the external
R
SET
resistor.
The FAN5616 includes built-in shutdown, short circuit
and thermal protection circuitry. A built-in smart soft-start
circuitry prevents excessive current draw during power
on while allowing for an increased PWM frequency for
dimming.
Minimal external components are required. Only two
0.1µF to 1µF bucket capacitors, a 4.7µF input capacitor
and a 1µF output capacitor are needed for proper opera-
tion.
The FAN5616 is available in a 3x3mm 16-lead MLP
package.
Forward Voltages
Adaptive V
OUT
Adjustment to the Highest Diode
Forward Voltage
Internally Matched LED Current Sources
Matched LED Currents with Matched or Unmatched
LEDs
Built-in Charge Pump with Three Modes of Operation:
1x, 1.5x, and 2x
Up to 90% Efficiency
Up to 50kHz PWM Dimming Frequency
Low EMI, Low Ripple
Up to 120mA Output Current
Drives up to 3 LEDs at 40mA each
External Resistor to Set Maximum (100%) LED
Current
Built-in 2-bit DAC to Control LED Current in Digital
Mode
2.5V to 5.5V Input Voltage Range
I
CC
< 1µA in Shutdown Mode
1MHz Operating Frequency
Shutdown Isolates Output from Input
Smart Soft-Start Limits In-Rush Current
Short Circuit Protection
Minimal External Components Needed
Available in a 3x3mm 16-lead MLP Package
Applications
■
Cell Phones
■
PDAs, DSCs, and MP3 Players
Ordering Information
Product Number
FAN5616
Package Type
3x3mm 16-Lead MLP
Order Code
FAN5616MPX
©2005 Fairchild Semiconductor Corporation
1
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Typical Application
EN2
GND
V
IN
C
IN
EN1
16
15
14
13
12
R
SET
1
NC
NC
2
3
4
5
P1
(GND)
11
10
9
CAP1
CAP2
6
7
8
V
OUT
C
OUT
Figure 1. Typical Application
Pin Assignment
Top View
EN1
GND
15
14
EN2
16
13
12
R
SET
NC
NC
LED-
V
IN
CAP2-
CAP1-
CAP1+
CAP2+
11
10
9
8
1
2
3
4
5
6
7
P1
(GND)
3x3mm 16-Lead MLP
Figure 2. Pin Assignment
2
PGND
V
OUT
LED-
LED-
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Pin Description
Pin No.
P1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
GND
R
SET
NC
NC
LED-
LED-
LED-
PGND
V
OUT
CAP2+
CAP1+
CAP1-
CAP2-
V
IN
GND
EN1
EN2
Pin Description
Ground.
P1 must be soldered to the PCB ground.
R
SET
Pin.
Connect this pin to the resistor used to set the maximum LED current.
No Connection.
No Connection.
1st LED Cathode.
Connect this pin to the LED’s cathode.
2nd LED Cathode.
Connect this pin to the LED’s cathode.
3rd LED Cathode.
Connect this pin to the LED’s cathode.
Power Ground.
Output Voltage.
Connect this pin to all of the LED’s anodes.
Bucket Capacitor 2.
Connect this pin to the positive terminal of the bucket capacitor.
Bucket Capacitor 1.
Connect this pin to the positive terminal of the bucket capacitor.
Bucket Capacitor 1.
Connect this pin to the negative terminal of the bucket capacitor.
Bucket Capacitor 2.
Connect this pin to the negative terminal of the bucket capacitor.
Supply Voltage Input.
Ground.
Enable Input.
Enable Input.
3
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Absolute Maximum Ratings
(Note1)
Parameter
V
IN
, V
OUT
, EN1, EN2, GND
Voltage On All Other Pins
CAP+, CAP- to GND
Thermal Resistance – Junction to Tab (
θ
JC
) (Note 2)
Lead Soldering Temperature (10 seconds)
Junction Temperature
Storage Temperature
Electrostatic Discharge Protection (ESD) Level (Note 3)
HBM
CDM
-65
2.5
1.5
Min
-0.3
GND – 0.3
-0.3
Max
6
V
IN
+ 0.3
V
IN
+ 0.3
8
260
150
150
Unit
V
V
V
°C/W
°C
°C
°C
kV
Recommended Operating Conditions
Parameter
Supply Voltage Range
LED Forward Voltage
Current Through Each LED
PWM Dimming Signal Frequency
Operating Ambient Temperature
Operating Junction Temperature
2
0.2
-40
-40
Min
2.5
Max
5.5
4
40
50
+85
+125
Unit
V
V
mA
kHz
°C
°C
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.
Unless otherwise specified all other voltages are referenced to GND.
2. Junction to ambient thermal resistance,
θ
JA
, is a strong function of PCB material, board thickness, thickness
and number of via used, diameter of via used, available copper surface, and attached heat sink characteristics.
A reasonable estimated value for
θ
JA
for zero air flow at 0.5W is 60°C/W.
3. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
4
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FAN5616 Rev. 1.0.0
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