FAN5610MPX_NL [FAIRCHILD]
LED Driver, 4-Segment, 3 X 3 MM, LEAD FREE, MO-229VEEC, MLP-8;
| 型号： | FAN5610MPX_NL |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | LED Driver, 4-Segment, 3 X 3 MM, LEAD FREE, MO-229VEEC, MLP-8 驱动 接口集成电路 |
| 文件： | 总10页 (文件大小：682K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2008
FAN5610
LED Driver for White, Blue, or Any Color LED
Features
Description
The FAN5610 generates matched current source drives
for a maximum of four LEDs. Since each LED current
source has its own self-regulating loop, precise current
matching is maintained even if there is a substantial
forward voltage spread among the LEDs. LED pre-
selection therefore is not required. To minimize voltage
drop and maximize efficiency, the value of the internal
current sense resistors connected in series with the
LEDs is very low (10Ω). This is an important
consideration for direct DC-driven white LEDs in
battery-powered systems.
LED Driver for Four Parallel-connected LEDs
Low Voltage Drop (<350mV) to Support Direct
Li-ion Applications with Low VF LEDs
Independent Control Loop for each LED
Regulated, Matched Constant Current in LEDs
No External Components
No EMI, No Switching Noise
Built-in DAC for Digital and PWM Brightness
Control
The LED current can be set to 0mA (OFF Mode), 7mA,
14mA, and 21mA with a built-in, two-bit, digital-to-
analog converter. Customized current settings can also
be used. When the control bits are set to zero, the
internal circuitry is disabled and the quiescent current
drops below 1µA.
Up to 91% Maximum Efficiency
Up to 84mA (21mA/LED) Bias Current
2.7V to 5.5V Input Voltage Range
ICC < 1µA in Shutdown Mode
Both digital input lines (A, B) can be pulse-width-
modulated (PWM). Using PWM, any value of average
LED current can be obtained within the 1 to 20 mA
range. The FAN5610 is available in an 8-lead 3x3mm
MLP package.
3mm x 3mm MLP-8 Package
Applications
Cell Phones
Handheld Computers
PDA, DSC, MP3 Players
LCD Display Modules
Keyboard Backlight
LED Displays
Typical Application
Ordering Information
Part Number
Operating Temperature Range
-40 to +85°C
Package
Packing Method
3x3mm, 8-Lead, Molded
Leadless Package (MLP)
FAN5610MPX
Tape and Reel
All packages are lead free per JEDEC: J-STD-020B standard.
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
Pin Configuration
Figure 1. Pin Configuration
Pin Definitions
Pin Name Description
D1
D2
Cathode of Diode No.1
Cathode of Diode No. 2
DAC Input B, Active High
DAC Input A, Active High
Input Voltage
IN B
IN A
VIN
D3
Cathode of Diode No. 3
Cathode of Diode No. 4
Ground
D4
GND
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
2
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Symbol
VIN
Parameter
IN A / IN B Voltage to GND
Min.
Max.
6.0
Unit
V
-0.3
TL
Lead Soldering Temperature, 10 Seconds
Operating Junction Temperature Range
Storage Temperature
+300
+150
+150
°C
TJA
°C
TSTG
-55
4
°C
Human Body Model, JESD22-A114
Charged Device Model, JESD22-C101
ESD
kV
2
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
Input Voltage Range
Operating Ambient Temperature Range
Min.
2.7
Typ.
Max.
5.5
Unit
V
(1)
VIN
TA
-40
+25
+85
°C
Note:
1. The minimum operating voltage depends on the LED operating voltage, as described in the Application
Information section.
DC Electrical Characteristics
VIN = 3.3V to 5.5V, TA = 25°C, unless otherwise noted. Boldface values indicate specifications over the ambient
operating temperature range.
Symbol
IIN
Parameter
Conditions
IN A = 0, IN B = 0
VD > 0.3V, IN A = 1, IN B = 1
Min.
Typ.
<1
Max.
2
Units
µA
Supply Current, OFF Mode
Output Current Accuracy
IOUT
14.8
-7.5
21.0
26.0
7.5
mA
%
IMATCH
LED to LED Current Matching VIN = 3.6V, IN A = 1, IN B = 1
LOW
0
0.3 × VIN
VIN
VIN_DAC DAC Input Voltage Threshold
V
HIGH
0.6 × VIN
Peak Efficiency
LED VF = 3V at 20mA
91
%
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
3
Block Diagram
VIN
D1
D2
D3
+
+
Error Amp.
Error Amp.
-
-
10
10
Bandgap
Reference
2-bit
DAC
D4
+
+
Error Amp.
Error Amp.
-
-
IN A
IN B
10
10
GND
Figure 2. Block Diagram
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
4
Typical Performance Characteristics
Unless otherwise specified, TA = 25°C and using Fairchild QTLP670IW Super Bright LED.
Figure 3. LED Current vs. Input Voltage
(Low VF – White LED)
Figure 4. LED Current vs. Cathode Voltage
Figure 5. LED Current vs. Temperature
Figure 6. Line Transient Response
Figure 7. DAC Transient Response
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
5
Functional Description
Digital LED Brightness Control
Digital Control
Digital Control with PWM
A
digital-to-analog converter selects the following
Any pin can be modulated by a variable duty cycle (δ)
pulse train. Care should be taken not to use too low a
frequency, otherwise a flickering effect can be seen.
The minimum range is between 100Hz to 5kHz. For the
maximum range of LED current, A and B can be
modulated at the same time.
modes of operation: OFF, 7mA, 14mA, and 21mA, per
diode. In addition, by turning the "IN B" pin ON and
OFF, the current can be modulated between 8 to 20mA
to achieve any IAVERAGE value.
Table 1. Digital Control Brightness Modes
A
B
0
0
1
0
0
1
1
1
ILED
OFF
7mA
14mA
21mA
Digital Control with PWM
Figure 8. A is PWM and B is LOW. ILED (average) = δ x 7mA, where δ is duty cycle.(2)
Figure 9. A is HIGH and B is PWM. ILED (average) = 7mA + δ x 14mA, where δ is duty cycle.(3,4)
Notes:
2. Proportionally select the duty cycle to achieve a typical LED current between 1mA to 6mA.
3. If either input A or B is HIGH continuously, the other input can be modulated at a maximum rate of 30kHz. If this
is not the case, the maximum rate of modulation should be limited to 1kHz.
4. Proportionally select the duty cycle to achieve a typical LED current between 8mA to 20mA.
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
6
Digital Control with PWM (Continued)
Figure 10. A and B are PWM. ILED (average) = δ x 21mA, where δ is duty cycle.(5)
Note:
5. Proportionally select the duty cycle to achieve a typical LED current between 1mA to 20mA.
Application Information
As seen in the block diagram in Figure 2, the FAN5610
includes four independent current regulators able to
maintain a programmable constant current through
LEDs, regardless of their for-ward voltage. This is true
over a wide range of input voltages, starting from VF_max
+ 0.35V, where VF_max is the highest forward voltage
among the LEDs driven by FAN5610. The
independence of current (LED current changes less
Program the LED’s brightness by applying a continuous
voltage level or a PWM signal at the inputs of the built-
in digital to analog converter (DAC). When a PWM
signal is utilized to drive the DAC inputs, the current
through the LEDs is switched between two levels with
the PWM signal frequency. Consequently, the average
current changes with the duty cycle. The LED current
waveform tracks the PWM signal, so the LEDs
brightness depends on the duty cycle.
than 1%) with change in VIN and VF for VIN > VF_max
0.35V, is shown in Figure 11.
+
For white LEDs, the spectral composition is optimal at a
current level specified by the manufacturer. The DAC
inputs should be programmed to set the current
required to achieve white LED spectrum and PWM
used for dimming. To maintain the "purest" white, the
current through the LEDs should be switched between
zero and a specified current level (usually around
20mA) corresponding to the white light chromaticity
coordinate.
Conversion errors are minimized, and the best LED-to-
LED matching is achieved over the entire range of
average current settings, when PWM brightness control
is used to modulate the LED current between zero and
the maximum value (A=1, B=1).
Figure 11. Current Regulation Performance
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
7
Application Examples
Example 1: Drive low VF white or blue LEDs directly
from single-cell Li-ion
Example 2: Drive high VF white or blue LEDs from
existing bus from 4.0V to 5.5V
When using white or blue low-VF LEDs, and utilizing the
driver’s low voltage drop, only 3.45V in VIN is needed for
the full 20mA LED current. Usually at 3.1V, there is still
5mA 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, not
down to the full discharge level (2.7V), before
requesting the charger.
High-VF white or blue LEDs have forward-voltage drop
in the range of 3.3V to 4.0V. Driving these LEDs with
the maximum current of 20mA for maximum brightness
usually requires a boost circuit for a single-cell Li-ion
voltage range. In some cases, there is already a voltage
bus in the system that can be utilized. Due to the low
voltage drop, VIN needs to be only 350mV higher than
the voltage VF of LEDs connected to FAN5610.
Figure 13. Drive High VF White or Blue LEDs from
Existing Bus from 4.0V to 5.5V
Figure 12. Drive Low VF White or Blue LEDs Directly
from Single-cell Li-ion
VDROP ~ 0.35V
(5)
(6)
(7)
VDROP ~ 0.35V
(1)
(2)
(3)
(4)
VF (at 20mA) = 3.3V to 4.0V (High VF)
VIN (at 20mA) ≥ VDROP + VF = 4.35V (max.)
where VIN = existing bus = 5V.
VF (at 20mA) < 3.1V (Low VF)
VIN (at 20mA) = VDROP + VF = 3.45V
VIN (at 5mA typical) ~ 3.1V
where VIN = single-cell Li-ion voltage.
Key Advantages:
No boost circuit needed for LCD or keyboard
backlight
Key Advantages:
Driver utilizes the existing bus
No boost circuit needed for the LCD or keyboard
backlight
Low voltage drop provides the full 20mA LED
current at the lowest possible voltage level
Driver directly connected to a Li-ion battery
No EMI, no switching noise, no boost efficiency
lost, no capacitor, no inductor
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
8
Physical Dimensions
2X
0.8 MAX
2X
RECOMMENDED LAND PATTERN
0.05
0.00
SEATING
PLANE
A. CONFORMS TO JEDEC REGISTRATION MO-229,
VARIATION VEEC, DATED 11/2001
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS AND TOLERANCES PER
ASME Y14.5M, 1994
D. FILENAME: MKT-MLP08Drev2
Figure 14. 3x3mm, 8-Lead, Molded Leadless Package
Note:
6. Center pad, P1, may be left floating or be connected to GND (Pin 8). The center pad must not be used as an
alternative GND connection to Pin 8.
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify
or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically
the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
9
© 2003 Fairchild Semiconductor Corporation
FAN5610 • Rev. 1.0.3
www.fairchildsemi.com
10
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