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FAN5611/FAN5612/FAN5613/FAN5614
Low-Dropout LED Drivers for White, Blue or any Color LED
Features
* LED Drivers for parallel-connected LEDs * Ultra-low voltage drop (< 300mV) to support direct 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 < 1A * Small footprint SC-70 and 2x2 MLP
General Description
The FAN5611/FAN5612/FAN5613/FAN5614 driver family provides matched current source bias for white, blue or any color LEDs. The current in the LEDs can be programmed by an external resistor. The individual LED currents are 200 x ISET, where ISET is the current through the external resistor connected to the CTRL pin. The FAN5611 and the FAN5613 are capable of driving four LEDs, while the FAN5612 can drive three LEDs. The FAN5614 is designated to drive two high current LEDs. In any case, at least I1 should be always connected to an LED in order to have the other LEDs driven with a matched current to I1. The FAN5612, FAN5613 and FAN5614 have Enable pin. When these devices are disabled, the supply current drops to less than 1A. The FAN5611, FAN5612 and FAN5614 drivers are available in a 6-lead SC-70 package. The FAN5613 is available in an 8-lead MLP package.
Applications
* * * * * * Cell Phones PDA, DSC, MP3 Players Handheld Computers LCD Display Modules Keyboard Backlight LED Displays
Typical Applications
VIN VIN VIN
ISET VCONTROL (3V) RSET
I4 CTRL
I3
I2
I1 VCONTROL (3V)
ISET RSET ENABLE
I3 CTRL ON/OFF
I2
I1
ISET VCONTROL (3V) RSET 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
VIN
ISET VCONTROL (3V) RSET CTRL ON/OFF
I1/I2
I3/I4
FAN5614
GND
ENABLE
Two Diode Control with ON/OFF
REV. 1.0.4 6/4/04
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
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 PACKAGE
TOP VIEW
ON/OFF I3 I4 GND NC CTRL I2 I1
FAN5613
2x2mm 8-LEAD MLP PACKAGE
Pin Description (6-Lead SC-70 and 8-Lead MLP)
Pin Name Pin No. 1 2 FAN5611 CTRL I2 FAN5612 CTRL ON/OFF I2 I3 I1/I2
3
FAN5613
FAN5614 CTRL Sets LED Current
Description Chip ON/OFF/Disable Connect to Cathode of LED Connect to Cathode of LED Connect to Cathode of LED
I1
I1 I4 N/C
Connect to Cathode of LED No Connection Ground Connect to Cathode of LED Connect to Cathode of LED GND
4 5
GND I4
GND I3
GND
I1 I3/I4 6 I3 ON/OFF I2 7 8 CTRL NC ON/OFF
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 No Connection
2
REV. 1.0.4 6/4/04
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
Absolute Maximum Ratings (Note1)
Parameter VI1, VI2, VI3, VI4 and ENABLE Voltage to GND CTRL Voltage to GND Power Dissipated by package at TA = 85C 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 (Note2) HBM CDM -55 4 1 6 Lead-SC70 8 Lead-MLP2X2 FAN5611/12/13 FAN5614 Min -0.3 -0.3 Max 6 3 190 700 40 80 300 150 150 C C C kV mA mW Unit V
Recommended Operating Conditions
Parameter LED Cathode Voltage Ambient Temperature FAN5611, FAN5612, FAN5613 FAN5614 Min 0.3 0.15 -40 25 85 C Typ 0.5 Max 1 Unit V
Notes: 1. Functional operation under these conditions is NOT implied. Performance and reliability are guaranteed only if Operating Conditions are not exceeded. 2. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model)
REV. 1.0.4 6/4/04
3
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
DC Electrical Characteristics (VIN = 3.3V to 5.5V, ENABLE = VIN, TA = 25C Unless otherwise noted)
Parameter Output Current Multiplication Ratio FAN5611/12/13 Conditions ISET = 100A VSAT = 300mV ISET = 100A VSAT = 150mV Min. 140 Typ. 200 Max. 260 Units
FAN5614
LED Current (Per Diode) FAN5611/12/13
VSAT = 300mV ISET = 100A
20
mA
FAN5614 LED to LED Current Matching FAN5611/12/13
VSAT = 150mV ISET = 100A VSAT = 300mV ISET = 100A TA = -40C to 85C VSAT = 150mV ISET = 100A TA = -40C to 85C VIN = 3V VEN = 0V ISET = 150A 0.5 90 1 3 % A V V -3 3 %
FAN5614
Peak Efficiency Current in OFF Mode (ISET and II) Min. ENABLE "ON Voltage" (Note3) (FAN5612, FAN5613, FAN5614) Max. ENABLE "OFF Voltage" (Note3) (FAN5612, FAN5613 FAN5614)
Notes: 3. ENABLE "ON" is VEN for which II1>20mA @ VI1=0.3V, while ENABLE "OFF" is VEN for which II1<1A @ VI1>0.3V
4
REV. 1.0.4 6/4/04
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
Typical Performance Characteristics
FAN5611_12_13 Output Current vs. Temperature
24 22 Output Current (mA) 20
ISET (A)
200
ISET vs. VCTRL
Cathode Voltage = 0.3V
150
18 16
For ISET = 0.1mA
100
50
14
For ISET = 0.05mA
12 -40 -20 0 20 40 60 80 100
0 0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Ambient Temperature (C)
VCTRL (V)
FAN5611_12_13 LED Current vs. LED Cathode Voltage
30
FAN5614 LED Current vs. LED Cathode Voltage
35 30
LED Current (mA)
25
LED Current (mA)
For ISET = 100A
20
25 20 15 10 5 0.0
For ISET = 50A
15
For ISET = 25A
10 0 0.0
For ISET = 50A
0.2
0.4 0.6 LED Cathode Voltage (V)
0.8
1.0
0.2
0.4 0.6 LED Cathode Voltage (V)
0.8
1.0
FAN5611_12_13 LED Current vs. Set Resistor
22
22
FAN5614 LED Current vs. Set Resistor
20
Cathode Voltage = 0.3V
20 18
VCONTROL = 3V
LED Current (mA)
18 16 14 12 10 8 6 4 2
Cat
0.2
hod e Vo
0V
0.2
5V
0.3V
LED Current (mA)
16 14 12 10 8
Cathode Voltage = 0.5V Cathode Voltage = 0.6V
Cath
ltag
e=
ode
Volt
0.15
V
age
= 0.
10V
Cathode
Voltage =
Cathode Voltage = 0.4V
6 4
0.05V
VCONTROL = 3V
20 40 60 Set Resistor (K) 80 100
0
20
40
60 80 100 Set Resistor (K)
120
140
160
REV. 1.0.4 6/4/04
5
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
Typical Performance Characteristics (cont.)
FAN5611_12_13_14 Control Voltage Transient Response
LED Current (10mA/div) LED Current (20mA/div)
FAN5612_13_14 Enable Voltage Transient Response
Time (1s/div)
Enable Voltage (2V/div)
CTRL Voltage (2V/div)
Time (1s/div)
6
REV. 1.0.4 6/4/04
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
Application Information
Setting the LED Current
The current flowing into LEDs is approximately 200 times greater then the current ISET. The LED current is controlled by VCONTROL and RSET according to the formula:
I LED = 200 x ( V CONTROL - V CTRL ) R SET
Application Notes
The ultra-low voltage drop across the FAN561X series of LED drivers, allow the devices to drive white, blue, and other color LEDs in a wide range of input voltages. The driver can be used in many applications. Although, only the FAN5613 is shown in all three examples, any of the FAN561X series of LED drivers can be used in the applications presented in this document, due to their similar operation.
For VCONTROL = 3V and a specified LED current, the RSET value can be evaluated using the diagram shown in the Typical Performance Characteristics section. For any other option, ISET value can be determined using the graph ISET vs. VCTRL. The LED's brightness can also be adjusted by driving ENABLE or the CTRL pin with a PWM signal. The driving signal frequency should be greater than 100Hz to avoid flickering, increasing to more than 1MHz, if necessary. LEDs are very sensitive to temperature. In most cases the maximum allowed junction temperature is 100C. This temperature is the result of adding to the ambient temperature the over temperature due to power dissipation, is described by as follows:
T j = T A + jA x I x V F
Example 1: Drive low VF white or blue LEDs directly from single cell Li-ion
When using white or blue low VF LEDs, and utilizing the drivers low voltage drop, only 3.4V in VIN is needed for the full 20mA LED current. At 3.1V, there is still 5mA typical current available for the LEDs. The single cell Li-ion is utilized in most applications like cell phones or digital still cameras. In most cases, the Li-ion battery voltage level only goes down to 3.0V voltage level, and not down to the full discharge level (2.7V) before requesting the charger.
VIN
where Tj is the LED junction temperature, TA is the ambient temperature, jA is the junction to ambient thermal resistance, I is the LED current and VF is the LED forward voltage. The FAN5611 to FAN5614 are designed to reduce the current through LEDs, when the temperature rises and the cathode voltage increases, as can be seen from typical the "LED Current vs. LED Cathode Voltage" graph under the Typical Performance Characteristics section. Efficiency Considerations The FAN561X driver's low dropout architecture can significantly improve the efficiency compared to using simple ballast resistors. The system efficiency, defined as the ratio between the LEDs power and the input supplied power can be calculated as follows:
Efficiency = ( V IN - V CATHODE ) V IN
VCONTROL
ISET RSET
I4 CTRL ON/OFF
I3
I2
I1
FAN5613
GND
ENABLE
- - - -
VDROP < 0.3V VF (at 20mA) < 3.1V (Low VF) VIN (at 20mA) =VDROP + VF = 3.4V VIN (at 5mA Typical) ~ 3.1V
Where VIN = Single cell Li-ion Voltage Key advantages: * No boost circuit needed for the LCD or keyboard backlight * Drivers directly connected to a Li-ion battery * No EMI, no switching noise, no boost efficiency lost, no capacitor, and no inductor.
The lower the VCATHODE, the higher the system efficiency. Efficiency can be further improved using a higher VIN with more LEDs as shown in example 3.
Example 2: Drive high VF white or blue LEDs from existing bus from 4.0V to 5.5V
High VF white or blue LEDs have forward voltage drop in the range of 3.2V to 4.0V. To drive these LEDs with the maximum current of 20mA for maximum brightness, usually requires a boost circuit for a single cell Li-ion voltage range.
REV. 1.0.4 6/4/04
7
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
In some cases, there is already a voltage bus in the system, which can be utilized. Due to the ultra-low voltage drop of the FAN561X series of LED drivers to drive high VF white or blue LEDs. The VIN needs to be only 300mV higher than the highest VF in the circuit.
VIN
Key advantage: * No need for current matching resistors and discrete transistor for brightness control
LED Brightness Control
All of the FAN561X LED Drivers feature analog and PWM controls to give designers flexible brightness control. These control methods can be applied to the circuit in two different ways, to provide more flexibility than any other solution. To determine the value of RSET, use the "ISET vs. VCTRL" graph under the Typical Performance Characteristics section.
VCONTROL
ISET RSET
I4 CTRL ON/OFF
I3
I2
I1
FAN5613
ENABLE
1. FAN5611
GND
VIN
- - - -
VDROP < 0.3V VF (at 20mA) < 3.3V to 4.0V (High VF) VIN (at 20mA) =VDROP + VF = 3.6V to 4.3V VIN (at 5mA Typical) ~ 3.3V
ISET VCONTROL (3V) RSET
I4 CTRL
I3
I2
I1
FAN5611
GND
Where VIN = Existing bus = 3.3V to 4.3V Key advantages: * No boost circuit needed for LCD or keyboard backlight * Driver utilizes the existing bus * Ultra-low voltage drop provides the full 20mA LED current at the lowest possible voltage level. - Analog Set VCONTROL and RSET for LED current
200 x ( V CONTROL - V CTRL ) I LED = ------------------------------------------------------------------------R SET
Example 3: Drive white, blue, red, amber LEDs string
Assuming boost circuit, or existing voltage bus, the FAN561X series of LED drivers can be used to drive a whole string of LEDs and flexible brightness control - analog and/or PWM.
- PWM VCONTROL = PWM - Amplitude sets maximum LED current - Pulse width controls between 0 and maximum
2. FAN5612
VIN
VIN
'N' number of LEDs Per Branch
ISET VCONTROL
ISET VCONTROL RSET ENABLE I4 CTRL I3 I2 I1
I3 CTRL
I2
I1
FAN5612
GND
RSET ENABLE ON/OFF
FAN5613
ON/OFF GND
- VDROP < 0.3V - VIN_MIN = N x VF + VDROP - VIN _MAX = N x VF + 5.5V Where VIN = Existing bus, boost voltage
- Analog Set VCONTROL and RSET for LED current - PWM - 1
200 x ( V CONTROL - V CTRL ) I LED = ------------------------------------------------------------------------R SET
VCONTROL = PWM
8
REV. 1.0.4 6/4/04
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
- Amplitude sets maximum LED current - Pulse width controls between 0 and maximum - PWM - 2 Set VCONTROL and RSET for maximum LED current
I LED 200 x I SET
- Analog Set VCONTROL and RSET for LED current
200 x ( V CONTROL - V CTRL ) I LED = ------------------------------------------------------------------------R SET
ON/OFF = PWM - Amplitude has no effect on current - Pulse width controls between 0 and maximum
- PWM - 1 VCONTROL = PWM - Amplitude sets maximum LED current - Pulse width controls between 0 and maximum - PWM - 2 Set VCONTROL and RSET for maximum LED current
I LED 200 x I SET 200 x ( V CONTROL - V CTRL ) I LED = ------------------------------------------------------------------------R SET
3. FAN5613
VIN
VCONTROL
ISET RSET
I4 CTRL ON/OFF
I3
I2
I1
FAN5613
VSS
ON/OFF = PWM - Amplitude has no effect on current - Pulse width controls between 0 and maximum
ENABLE
- Analog Set VCONTROL and RSET for LED current
200 x ( V CONTROL - V CTRL ) I LED = ------------------------------------------------------------------------R SET
- PWM - 1 VCONTROL = PWM - Amplitude sets maximum LED current - Pulse width controls between 0 and maximum - PWM - 2 Set VCONTROL and RSET for maximum LED current
I LED 200 x I SET
ON/OFF = PWM - Amplitude has no effect on current - Pulse width controls between 0 and maximum
4. FAN5614
VIN
ISET VCONTROL RSET
ENABLE
I1/I2 CTRL ON/OFF VSS
I3/I4
FAN5614
REV. 1.0.4 6/4/04
9
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
Mechanical Dimensions
2mmx 2mm 8-Lead MLP
0.15 C 2X 2.0 A B 8 1.40 5 2.55 2.0 0.70 (0.78) 0.15 C TOP VIEW 1.0 MAX 0.10 C (0.20) 0.08 C 0.05 0.00 SIDE VIEW 2X 0.50 TYP 1 4 0.30 TYP 1.00
RECOMMENDED LAND PATTERN
C
SEATING PLANE
PIN #1 IDENT 1 0.45 0.20
1.25 1.20 4
0.65 0.60
8 0.50 1.50
5
0.18~0.30 0.10 M C A B 0.10 M C
BOTTOM VIEW
NOTES: A. CONFORMS TO JEDEC REGISTRATION MO-229, VARIATION VCCD-3, DATED 11/2001 B. DIMENSIONS ARE IN MILLIMETERS. C. DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994
10
REV. 1.0.4 6/4/04
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
Mechanical Dimensions
6-Lead SC-70 Package
2.00 0.20
SYMM C L 0.65 0.50 MIN
6
4
B
1.25 0.10
1.90
1
3 0.30 0.15
(0.25) 0.65 1.30
0.40 MIN 0.10 M A B 1.30 LAND PATTERN RECOMMENDATION
1.00 0.80 1.10 0.80 0.10 0.00 SEATING PLANE C
SEE DETAIL A
C
(0.43) 2.10 0.30
GAGE PLANE
(R0.10) 0.25 0.10
NOTES: UNLESS OTHERWISE SPECIFIED A) B) C) THIS PACKAGE CONFORMS TO EIAJ SC-88A, 1996. ALL DIMENSIONS ARE IN MILLIMETERS. DIMENSIONS DO NOT INCLUDE BURRS OR MOLD FLASH.
0.20 0.45 0.30 DETAIL A
SCALE: 2X
30 0
REV. 1.0.4 6/4/04
11
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
Ordering Information
Product Number FAN5611 FAN5612 FAN5613 FAN5614 Package Type 6-Lead SC-70 6-Lead SC-70 2mm x 2mm 8-Lead MLP 6-Lead SC-70 Order Code FAN5611S7X FAN5612S7X FAN5613MPX FAN5614S7X
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 6/4/04 0.0m 005 Stock#DS30005611 2004 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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