Fairchild FAN5612 Low-dropout led drivers for white, blue or any color led Datasheet

www.fairchildsemi.com
FAN5611/FAN5612/FAN5613/FAN5614
Low-Dropout LED Drivers for White, Blue or any
Color LED
Features
General Description
• 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 < 1µA
• Small footprint SC-70 and 2x2 MLP
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 1µA.
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
ISET
VCONTROL (3V)
I4
I3
I2
I1
ISET
VCONTROL (3V)
CTRL
RSET
VIN
VIN
VIN
FAN5611
GND
I3
CTRL
RSET
ENABLE
Four Diode Control
I2
I1
FAN5612
ISET
VCONTROL (3V)
ENABLE
ON/OFF
I4
CTRL
RSET
I3
I2
I1
FAN5613
ON/OFF
GND
GND
Three Diode Control with ON/OFF
Four Diode Control With ON/OFF
VIN
I1/I2
ISET
VCONTROL (3V)
CTRL
RSET
ENABLE
I3/I4
FAN5614
ON/OFF
GND
Two Diode Control with ON/OFF
REV. 1.0.4 6/4/04
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
Pin Assignments
CTRL
1
CTRL
I3
6
1
6
ON/OFF
I2
2
5
I4
I2
2
5
I3
I1
3
4
GND
I1
3
4
GND
CTRL
1
6
ON/OFF
I1/I2
2
5
I3/I4
N/C
3
4
GND
FAN5612
FAN5611
FAN5614
6-LEAD SC-70 PACKAGE
TOP VIEW
ON/OFF
NC
I3
CTRL
I4
I2
GND
I1
FAN5613
2x2mm 8-LEAD MLP PACKAGE
Pin Description (6-Lead SC-70 and 8-Lead MLP)
Pin Name
Pin No.
FAN5611
FAN5612
1
CTRL
CTRL
FAN5613
FAN5614
CTRL
ON/OFF
2
I2
Description
Sets LED Current
Chip ON/OFF/Disable
I2
Connect to Cathode of LED
I3
Connect to Cathode of LED
I1/I2
3
I1
I1
Connect to Cathode of LED
I4
4
GND
5
I4
GND
GND
Connect to Cathode of LED
N/C
No Connection
GND
Ground
Connect to Cathode of LED
I3
Connect to Cathode of LED
I1
Connect to Cathode of LED
I3/I4
6
I3
Connect to Cathode of LED
ON/OFF
ON/OFF
I2
2
Connect to Cathode of LED
7
CTRL
8
NC
Chip ON/OFF/Disable
Connect to Cathode of LED
Sets LED Current
No Connection
REV. 1.0.4 6/4/04
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
Absolute Maximum Ratings (Note1)
Parameter
Min
Max
Unit
V
VI1, VI2, VI3, VI4 and ENABLE Voltage to GND
-0.3
6
CTRL Voltage to GND
-0.3
3
Power Dissipated by package at TA = 85°C
6 Lead-SC70
190
8 Lead-MLP2X2
700
I1, I2, I3, I4 Steady State Current
FAN5611/12/13
40
I1/I2, I3/I4 Steady State Current
FAN5614
mW
mA
80
Lead Temperature (Soldering 10 seconds)
300
°C
Junction Temperature
150
°C
150
°C
Storage Temperature
-55
Electrostatic Discharge Protection (ESD) Level
(Note2)
HBM
4
CDM
1
kV
Recommended Operating Conditions
Parameter
LED Cathode Voltage
Ambient Temperature
Min
Typ
Max
Unit
FAN5611, FAN5612, FAN5613
0.3
0.5
1
V
FAN5614
0.15
25
85
°C
-40
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 = 25°C Unless otherwise noted)
Parameter
Output Current
Multiplication Ratio
Conditions
Min.
Typ.
Max.
FAN5611/12/13
ISET = 100µA
VSAT = 300mV
140
200
260
FAN5614
ISET = 100µA
VSAT = 150mV
LED Current (Per Diode) FAN5611/12/13
LED to LED Current
Matching
VSAT = 300mV
ISET = 100µA
FAN5614
VSAT = 150mV
ISET = 100µA
FAN5611/12/13
VSAT = 300mV
ISET = 100µA
TA = -40°C to
85°C
FAN5614
VSAT = 150mV
ISET = 100µA
TA = -40°C to
85°C
Units
20
-3
mA
3
%
Peak Efficiency
VIN = 3V
Current in OFF Mode (ISET and II)
VEN = 0V
1
µA
ISET = 150µA
3
V
Min. ENABLE “ON Voltage” (Note3)
(FAN5612, FAN5613, FAN5614)
Max. ENABLE “OFF Voltage” (Note3)
(FAN5612, FAN5613 FAN5614)
90
%
0.5
V
Notes:
3. ENABLE “ON” is VEN for which II1>20mA @ VI1=0.3V, while ENABLE “OFF” is VEN for which II1<1µA @ 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
ISET vs. VCTRL
24
200
Cathode Voltage = 0.3V
150
20
18
ISET (µA)
Output Current (mA)
22
For ISET = 0.1mA
100
16
50
14
For ISET = 0.05mA
12
-40
-20
0
20
40
60
80
0
0.0
100
0.8
1.0
1.2
1.4
1.6
1.8
FAN5614
LED Current vs. LED Cathode Voltage
35
30
LED Current (mA)
For ISET = 100µA
20
15
For ISET = 50µA
10
0
0.0
0.2
For ISET = 50µA
25
20
15
For ISET = 25µA
10
0.4
0.6
LED Cathode Voltage (V)
0.8
5
0.0
1.0
0.2
0.4
0.6
LED Cathode Voltage (V)
0.8
1.0
FAN5614
LED Current vs. Set Resistor
FAN5611_12_13
LED Current vs. Set Resistor
22
22
Cathode Voltage = 0.3V
VCONTROL = 3V
LED Current (mA)
18
16
Cathode Voltage = 0.5V
14
Cathode Voltage = 0.6V
12
Cat
10
8
16
14
Cath
ode
6
ltag
e=
0.3V
0.15
V
age
= 0.
10V
10
8
Cathode
6
Cathode Voltage = 0.4V
e Vo
Volt
12
5V
0V
hod
18
0.2
0.2
20
20
LED Current (mA)
0.6
FAN5611_12_13
LED Current vs. LED Cathode Voltage
25
4
0.4
VCTRL (V)
30
LED Current (mA)
0.2
Ambient Temperature (°C)
4
Voltage =
0.05V
VCONTROL = 3V
2
0
20
REV. 1.0.4 6/4/04
40
60
80
100
Set Resistor (KΩ)
120
140
160
20
40
60
Set Resistor (KΩ)
80
100
5
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
Typical Performance Characteristics (cont.)
LED Current
(20mA/div)
CTRL Voltage
(2V/div)
Time (1µs/div)
6
FAN5612_13_14
Enable Voltage Transient Response
Enable Voltage
(2V/div)
LED Current
(10mA/div)
FAN5611_12_13_14
Control Voltage Transient Response
Time (1µs/div)
REV. 1.0.4 6/4/04
PRODUCT SPECIFICATION
FAN5611/FAN5612/FAN5613/FAN5614
Application Information
Application Notes
Setting the LED Current
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.
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 × ( V CONTROL – V CTRL ) ⁄ R SET
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 100°C. This temperature is the result of adding to the ambient temperature
the over temperature due to power dissipation, is described
by as follows:
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
T j = T A + Θ jA × I × V F
where Tj is the LED junction temperature, TA is the ambient
temperature, ΘjA is the junction to ambient thermal resistance, I is the LED current and VF is the LED forward
voltage.
VCONTROL
ISET
I4
CTRL
I2
I1
FAN5613
RSET
ENABLE
I3
ON/OFF
GND
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
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.
–
–
–
–
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.
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
VCONTROL
ISET
I4
CTRL
I3
I2
I1
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.
FAN5613
RSET
1. FAN5611
ON/OFF
ENABLE
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)
I4
CTRL
RSET
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.
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.
- Analog
Set VCONTROL and RSET for LED current
200 × ( V CONTROL – V CTRL )
I LED = ------------------------------------------------------------------------R SET
- 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
I3
I2
I1
I3
CTRL
I2
I1
FAN5612
RSET
CTRL
FAN5613
ENABLE
ON/OFF
GND
ON/OFF
GND
– VDROP < 0.3V
– VIN_MIN = N × VF + VDROP
– VIN _MAX = N × VF + 5.5V
Where VIN = Existing bus, boost voltage
- Analog
Set VCONTROL and RSET for LED current
- PWM - 1
200 × ( 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
- Analog
Set VCONTROL and RSET for LED current
- PWM - 2
Set VCONTROL and RSET for maximum LED current
200 × ( V CONTROL – V CTRL )
I LED = ------------------------------------------------------------------------R SET
I LED ∼ 200 × I SET
- PWM - 1
VCONTROL = PWM
ON/OFF = PWM
– Amplitude has no effect on current
– Pulse width controls between 0 and maximum
- PWM - 2
Set VCONTROL and RSET for maximum LED current
3. FAN5613
VIN
VCONTROL
– Amplitude sets maximum LED current
– Pulse width controls between 0 and maximum
I LED ∼ 200 × I SET
ISET
I4
CTRL
RSET
ENABLE
I3
I2
I1
200 × ( V CONTROL – V CTRL )
I LED = ------------------------------------------------------------------------R SET
ON/OFF = PWM
FAN5613
ON/OFF
– Amplitude has no effect on current
– Pulse width controls between 0 and maximum
VSS
- Analog
Set VCONTROL and RSET for LED current
200 × ( 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 × I SET
ON/OFF = PWM
– Amplitude has no effect on current
– Pulse width controls between 0 and maximum
4. FAN5614
VIN
I1/I2
ISET
VCONTROL
CTRL
I3/I4
FAN5614
RSET
ENABLE
REV. 1.0.4 6/4/04
ON/OFF
VSS
9
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
Mechanical Dimensions
2mmx 2mm 8-Lead MLP
2.0
0.15 C
A
B
2X
8
1.40
5
2.55
2.0
1.00
0.70
(0.78)
0.15 C
1
2X
TOP VIEW
0.50 TYP
1.0 MAX
4
0.30 TYP
RECOMMENDED LAND PATTERN
0.10 C
(0.20)
0.08 C
0.05
0.00
C
SEATING
PLANE
SIDE VIEW
1.25
1.20
PIN #1 IDENT
1
4
0.45
0.20
0.65
0.60
8
5
0.50
1.50
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
SYMM
CL
0.65
2.00 ± 0.20
0.50 MIN
6
4
B
1.25 ± 0.10
1
1.90
3
0.30
0.15
(0.25)
0.40 MIN
1.30
0.10 M A B
0.65
LAND PATTERN RECOMMENDATION
1.30
SEE DETAIL A
1.00
0.80
1.10
0.80
C
0.10
0.00
C
(0.43)
SEATING
PLANE
GAGE
PLANE
2.10 ±0.30
NOTES: UNLESS OTHERWISE SPECIFIED
(R0.10)
A)
0.25
0.10
0.20
0.45
0.30
B)
C)
THIS PACKAGE CONFORMS TO EIAJ
SC-88A, 1996.
ALL DIMENSIONS ARE IN MILLIMETERS.
DIMENSIONS DO NOT INCLUDE BURRS
OR MOLD FLASH.
30°
0°
DETAIL A
SCALE: 2X
REV. 1.0.4 6/4/04
11
FAN5611/FAN5612/FAN5613/FAN5614
PRODUCT SPECIFICATION
Ordering Information
Product Number
Package Type
Order Code
FAN5611
6-Lead SC-70
FAN5611S7X
FAN5612
6-Lead SC-70
FAN5612S7X
FAN5613
2mm x 2mm 8-Lead MLP
FAN5613MPX
FAN5614
6-Lead SC-70
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.
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.
www.fairchildsemi.com
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Stock#DS30005611
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