Low-Dropout LED Drivers for White, Blue, or any Color LED
November 2006
tm
FAN5611/FAN5612/FAN5613/FAN5614
Low-Dropout LED Drivers for White, Blue,
or any Color LED
Features
■
LED drivers for parallel-connected LEDs (2 to 4)
■
Ultra-low voltage drop (< 300mV) to support direct
■
■
■
■
■
■
■
■
■
Description
The FAN5611/12/13/14 low-dropout product family is
designed to drive two to four parallel LEDs, providing
matched current source bias for all color LEDs. The LED
current is set by an external resistor, R
SET
. The
FAN5611/13 supports four parallel LEDs with up to
160mA bias current (up to 40mA per output). The
FAN5612 supports three LEDs with up to 120mA bias
current (40mA per output). The FAN5614 drives two
high-current LEDs (80mA per output). Pin I1 should
always be connected to an LED to provide a matched
current for any additional LEDs.
The FAN5612/13 and 14 are selected using an ENABLE
pin. When the chip is not selected (ENABLE pin is
LOW), the supply current drops to less than 1µA.
The FAN5611, FAN5612, and FAN5614 are available in
an SC-70 package. The FAN5611 and FAN5613 are
available in MLP packages.
Li-ion applications
No EMI, no switching noise
No external components needed for current matching
Both analog and PWM brightness control
FAN5611, FAN5613 feature up to 160mA bias current
(up to 40mA for each LED)
FAN5612 features up to 120mA bias current
(up to 40mA for each LED)
FAN5614 features up to 160mA bias current
(up to 80mA for each LED)
Enable/Shutdown control (FAN5612, FAN5613,
FAN5614)
Shutdown current < 1μA
Small footprint SC-70 and MLP
Applications
■
Cell Phones
■
PDA, DSC, MP3 Players
■
Handheld Computers
■
LCD Display Modules
■
Keyboard Backlight
■
LED Displays
Ordering Information
Product Number
FAN5611
FAN5612
FAN5613
FAN5614
Table 1. Ordering Information
Package Type
6-Lead SC-70 / 2x2mm 6-Lead MLP
6-Lead SC-70
2x2mm 8-Lead MLP
6-Lead SC-70
Order Code
FAN5611S7X / FAN5611MPX
FAN5612S7X
FAN5613MPX
FAN5614S7X
© 2003 Fairchild Semiconductor Corporation
FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9
www.fairchildsemi.com
FAN5611/FAN5612/FAN5613/FAN5614
Typical Applications
V
IN
V
IN
V
IN
I
SET
V
CONTROL
(3V
)
R
SET
I4
CTRL
I3
I2
I1
V
CONTROL
(3V)
I
SET
R
SET
ENABLE
I3
CTRL
ON/OFF
I2
I1
I
SET
V
CONTROL
(3V)
R
SET
ENABLE
I4
CTRL
ON/OFF
I3
I2
I1
FAN5611
GND
FAN5612
GND
FAN5613
GND
Four Diode Control
Three Diode Control with ON/OFF
Four Diode Control With ON/OFF
V
IN
I
SET
V
CONTROL
(3V)
R
SET
CTRL
ON/OFF
I1/I2
I3/I4
FAN5614
GND
ENABLE
Two Diode Control with ON/OFF
Figure 1. Typical Applications for FAN5611, FAN5612, FAN5613, FAN5614
Pin Assignments
CTRL
I2
I1
1
2
3
6
5
4
I3
I4
GND
CTRL
I2
I1
1
2
3
6
5
4
ON/OFF
I3
GND
CTRL
I1/I2
N/C
1
2
3
6
5
4
ON/OFF
I3/I4
GND
FAN5611
FAN5612
FAN5614
6-LEAD SC-70
TOP VIEW
D2
CTRL
D3
GND
D1
GND
D4
ON/OFF
I3
I4
GND
TOP VIEW
NC
CTRL
I2
I1
FAN5611
FAN5613
2x2mm 6-LEAD MPX
2x2mm 8-LEAD MLP
Figure 2. Pin Assignments for FAN5611, FAN5612, FAN5613, FAN5614
© 2003 Fairchild Semiconductor Corporation
FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9
2
www.fairchildsemi.com
FAN5611/FAN5612/FAN5613/FAN5614
Pin Descriptions
Name
Pin #
1
2
FAN5611
CTRL
I2
FAN5612
CTRL
FAN5613
ON/OFF
FAN5614
CTRL
Description
Sets LED Current (see Operational Descripton)
Chip ON/OFF/Disable
Connect to Cathode of LED
Connect to Cathode of LED
I2
I3
I1/I2
3
I1
I1
I4
N/C
Connect to Cathode of LED
Connect to Cathode of LED
No Connection
Ground
Connect to Cathode of LED
Connect to Cathode of LED
I1
I3/I4
Connect to Cathode of LED
Connect to Cathode of LED
Connect to Cathode of LED
Chip ON/OFF/Disable
Connect to Cathode of LED
Sets LED Current (see Operational Descripton)
No Connection
GND
4
5
GND
I4
GND
I3
GND
6
I3
ON/OFF
I2
ON/OFF
CTRL
NC
7
8
Table 2. Pin Descriptions
Notes:
1. The DAP of FAN 5611MPX can be tied to the GND pin or left floating. For better power dissipation, tie to GND.
© 2003 Fairchild Semiconductor Corporation
FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9
3
www.fairchildsemi.com
FAN5611/FAN5612/FAN5613/FAN5614
Absolute Maximum Ratings
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The
device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are
not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table defines the condi-
tions for actual device operation.
Parameter
V
I1
, V
I2
, V
I3
, V
I4
and ENABLE Voltage to GND
CTRL Voltage to GND
Power Dissipated by package at T
A
= 85°C
I1, I2, I3, I4 Steady State Current
I1/I2, I3/I4 Steady State Current
Lead Temperature (Soldering 10 seconds)
Junction Temperature
Storage Temperature
Electrostatic Discharge Protection (ESD) Level
(1)
HBM
CDM
Table 3. Absolute Maximum Ratings
6-Lead SC70
6, 8-Lead MLP
FAN5611/12/13
FAN5614
Min.
-0.3
-0.3
Max.
6.0
3.0
190
700
40
80
300
150
Unit
V
mW
mA
°C
°C
°C
kV
-55
4
1
150
Recommended Operating Conditions
Parameter
LED Cathode Voltage
FAN5611, FAN5612, FAN5613
FAN5614
Ambient Temperature
Table 4. Recommended Operating Conditions
Notes:
2. Using Mil Std. 883E, method 3015.7 (Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
Min.
0.3
0.15
-40
Typ.
0.5
Max.
1.0
Unit
V
25
85
°C
© 2003 Fairchild Semiconductor Corporation
FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9
4
www.fairchildsemi.com
FAN5611/FAN5612/FAN5613/FAN5614
DC Electrical Characteristics
V
IN
= 3.3V to 5.5V, ENABLE = V
IN
, T
A
= 25°C unless otherwise noted.
Parameter
FAN5611/12/13
Current Gain
FAN5614
FAN5611/12/13
FAN5614
Conditions
I
SET
= 100µA
V
SAT
= 300mV
I
SET
= 100µA
V
SAT
= 150mV
V
SAT
= 300mV
I
SET
= 100µA
V
SAT
= 150mV
I
SET
= 100µA
Min.
Typ.
Max.
Units
140
200
260
LED Current (Per Diode)
20
mA
LED to LED Current Matching
V
SAT
= 300mV
FAN5611/12/13
I
SET
= 100µA
T
A
= -40°C to 85°C
FAN5614
V
SAT
= 150mV
I
SET
= 100µA
T
A
= -40°C to 85°C
V
IN
= 3V
V
EN
= 0V
I
SET
= 150µA
-3
3
%
Peak Efficiency
Current in OFF Mode (I
SET
and I
I
)
Minimum ENABLE “ON Voltage”
(2)
(FAN5612, FAN5613, FAN5614)
Maximum ENABLE “OFF Voltage”
(2)
(FAN5612, FAN5613 FAN5614)
Table 5. DC Electrical Characteristics
90
1
2.8
0.5
%
µA
V
V
Notes:
3. ENABLE “ON” is V
EN
where I
I1
>20mA @ V
I1
=0.3V, while ENABLE “OFF” is V
EN
where I
I1
<1μA @ V
I1
>0.3V.
© 2003 Fairchild Semiconductor Corporation
FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9
5
www.fairchildsemi.com
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