Fairchild FAN5608 Serial / parallel led driver with current-regulated, step-up dc/dc converter Datasheet

FAN5608 Serial / Parallel LED Driver with
Current-Regulated, Step-Up DC/DC Converter
Features
Description
ƒ Two independent channels drive up to six LEDs
The FAN5608 is an integrated Schottky diode LED
driver, which generates regulated output currents from a
battery input voltage of 2.7V to 5V. An internal MOS
switch and the external inductor deliver the necessary
voltage to the load. The proprietary internal
compensation loop continuously monitors the lowest
LED cathode voltage of both channels and adjusts the
VOUT voltage to the minimum value. The minimum VOUT
is determined by the highest LED forward voltage of the
selected channel. This adaptive nature allows the
FAN5608 architecture to deliver high efficiency. Up to
twelve LEDs can be connected in series as long as the
summed forward voltage does not exceed the maximum
specification of 24V. It is not required to match an equal
number of LEDs serially within each channel; FAN5608
delivers the highest efficiency and best current
regulation in the balanced configuration.
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
per channel
Adaptive output voltage drive to maximize efficiency
PFM mode of operation of the boost circuit
Up to 85% efficiency
Up to 2×20mA output
Two built-in DACs for independent (digital) brightness
control for both channels
LED current can be duty-cycle-modulated, 0 to 20mA
Digital, analog, and PWM brightness control
2.7V to 5.5V input voltage range
500KHz operating frequency
Soft-start feature
Low shutdown current: ICC< 1μA
Open-load protection
Minimal external components needed
Space-saving 4x4mm 12-lead MLP packages
Applications
ƒ Cell phones
ƒ Handheld computers
ƒ PDAs, DSCs, MP3 players
ƒ Keyboard backlights
FAN5608 has two internal two-bit D/A converters that
provide independent programmability to each output
channel. In analog programming, "B" pins must be GND
(logic “0”); a resistor must be connected between pin “A”
and a fixed supply voltage. The output current can be
programmed to any desired value within the specified
range. The FAN5608DHMPX is available in a 4x4mm
12-lead MLP package. A single external resistor sets the
current and turns the device ON and OFF.
ƒ LED displays
Ordering Information
Part Number
Pb-Free
Schottky Diode
Package
Packing Method
FAN5608DHMPX
Yes
Internal
MLP-12 4x4mm
Tape and Reel
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
www.fairchildsemi.com
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
August 2006
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
Block Diagram
Figure 1. Block Diagram
Pin Configuration
TOP-VIEW
NC
INDB
VOUT
12
11
10
GND
1
9
INDA
CH1
2
8
CH2
B1
3
7
4
5
B2
6
A1 VIN A2
4x4mm 12-Lead MLP(QUAD)
(Internal Schottky Diode)
FAN5608DHMPX
Figure 2. FAN5608M MLP package
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
www.fairchildsemi.com
2
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
Name
GND
CH1
B1
A1
VIN
A2
B2
CH2
INDA
INDB
VOUT
NC
Description
Ground
First LED Cathode
DAC B1
DAC A1
Input Voltage
DAC A2
DAC B2
Second LED Cathode
SD Anode. INDA and INDB must be connected together externally on the PCB.
Inductor. INDA and INDB must be connected together externally on the PCB.
Output LEDs Anode
No Connection
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
conditions for actual device operation.
Parameter
Min.
Max.
Units
VIN to GND
VOUT to GND
CH1,CH2 Voltage to GND
All Other Pins
Junction Temperature (TJ)
Storage Temperature
Lead Soldering Temperature, 10 seconds
-0.3
-0.3
6.5
35
25
VIN+0.3
150
150
300
V
V
V
V
°C
°C
°C
Electrostatic Discharge Protection (1,2)
-0.3
-20
-65
HBM
CDM
1.5
2
kV
Notes:
1. Using Mil Std. 883E, method 3015.7 (Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
2. Avoid positive polarity ESD stress at the cathode of the internal Schottky diode (Schottky diode cathode <1.5kV).
Recommended Operating Conditions
Parameter
Supply Voltage VIN
Output Voltage Range
Ambient Temperature (TA )
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
Conditions
POUT <0.6W, 2 channels evenly loaded
Min.
2.7
VIN
-40
Typ.
Max.
Units
25
5.5
24
85
V
V
°C
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3
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
Pin Definitions
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
Typical Application
Digital Brightness Control
CIN
L = 4.7µH
2.7V to 5.5V
INDB
INDA
VIN
VOUT
A1
DAC Input For CH1
FAN5608DHMPX
B1
DAC Input For CH2
VOUT
4.7µF
GND
CH2
A2
CH1
B2
NC
Figure 3. FAN5608 Digital Brightness Circuit
Analog Brightness Control
CIN
2.7V to 5.5V
L = 4.7µH
VEXTERNAL
INDB
INDA
VIN
VOUT
A1
A2
FAN5608DHMPX
VOUT
4.7µF
GND
CH2
B1
CH1
B2
NC
Figure 4. FAN5608 Analog Brightness Circuit
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
www.fairchildsemi.com
4
Recommended operating conditions and component values are per the Figure 18 test circuit. Typical values are at
25°C and VIN=3.6V. Boldface indicates specifications over ambient operating temperature (-40°C to +85°C).
Parameter
Supply current in OFF mode
LED current accuracy
Current matching(3)
Switching frequency
Internal reference voltage, VA
Current multiplication ratio
Power efficiency (AVG)(4)
Input A1, A2 threshold
Conditions
A input LOW, B input LOW
A input HIGH, B input HIGH
A input HIGH, B input HIGH
Min.
Typ.
Max.
Units
18
0.1
20
1
22
3
µA
mA
%
KHz
V
Analog Control Mode
850
VIN > 3V
HIGH
LOW
Digital Control Mode
VIN -0.7
0
Analog Control Mode
Input B1, B2 threshold
Digital Control Mode
Input A1, A2 current
Digital Control Mode
Input B1, B2 current
Digital Control Mode
500
1.2
1000
80
1150
%
VIN
0.6
V
1.2
HIGH
LOW
VA = VIN
VA =0
0.6 x VIN
0
50
VIN
0.3 x VIN
80
0.1
0.1
V
µA
µA
Notes:
3. Current matching is the absolute value of the difference in current of the two LEDs channels, divided by the
average current in the two channels.
4. Power efficiency is the ratio between the electrical power to the LEDs and the total power consumed from the
input power supply. Although this definition leads to a lower value than the boost converter efficiency, it more
accurately reflects the system performance in an application.
Circuit Description
LED Brightness Control
When power is applied to the VIN pin, the system is
enabled, the bandgap reference acquires its nominal
voltage (1.2V), and the soft-start cycle begins. Once
“power good” is achieved (when 0.5mA voltage flows
through the LEDs), the soft-start cycle stops, and the
boost voltage increases to generate the current selected
by the input control pins (A1, A2, B1, B2).
The control inputs are A1 and B1 for CH1 and A2 and
B2 for CH2. B1 and B2 are digital inputs that require
LOW (GND) and HIGH VIN control signals. In analog
mode, A1 and A2 are connected to an external stable
voltage source via an external resistor, and B1 and B2
inputs are connected to ground. The current flowing
through the resistor is scaled by a factor of
approximately 1000.
If CH1 is not selected, the CH1 output pin is HIGH, its
output measurement is approximately equal to VOUT,
and its LEDs are OFF. The FAN5608 provides tightly
regulated output currents for the selected LED’s
channel. An internal feedback loop determines which
LED string requires the highest output voltage to sustain
the pre-set current. It also adjusts the boost regulator
based on CH1 and CH2 feedback voltage and A1, A2,
B1, B2 input settings. System efficiency decreases if the
channels’ strings of LEDs have different forward voltage.
LED dimming can be controlled with static or dynamic
inputs from CH1 and CH2. CH1 and CH2 outputs are
driven directly by A1, B1 and A2, B2 inputs, respectively.
Either channel can be configured as analog or digital.
Inputs A1 and A2 are analog inputs that can be
connected to an external regulated voltage source,
which can be calculated by:
EQ 1
If one channel is used, the other channel should be
disabled by connecting the corresponding DAC inputs to
logic LOW. If the external output capacitor VOUT is
shorted to GND, the internal Schottky diode can be
damaged, a condition which should be avoided.
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
where current multiplication ratio is according to the
Electrical Specifications table.
Inputs B1 and B2 are digital inputs and can only be set
by external logic of “0” (LOW) or “1” (HIGH).
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5
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
Electrical Specifications
PWM Control in Digital Dynamic Mode
The FAN5608’s digital decoder allows selection of the
following modes of operation: OFF, 5mA, 10mA, and
20mA per channel.
In Digital Dynamic Mode, if inputs A1 and/or A2 are
externally driven by an open-drain output, the pull-up
resistance should be less than 10kΩ to ensure less than
0.7V dropout; VA > (VIN – 0.7V), as required for HIGH logic
level.
A
B
ILED
0
0
OFF
1
0
5mA
0
1
10mA
1
1
20mA
The logic level HIGH (VH) and logic level LOW (VL) of
the PWM signal should be:
(VIN – 0.7V) < VH < VIN
Analog Static Control
EQ 3
and
In Analog Mode, B1 and B2 inputs should be connected
to GND or “0” logic. A1 and A2 control the LED current
through an external resistor (R), as shown in Figure 4, or
an external voltage (VEXT) input.
0 < VL < 0.6V.
EQ 4
The frequency of the PWM signal should be within the
50Hz to 1kHz range, by default, or 30kHz at any input if
the other input is kept HIGH.
The ILED value can be calculated using the formula or
the graph below:
PWM Control in Analog Dynamic Mode
In Analog Dynamic Mode, the logic level HIGH (VH) and
logic level LOW (VL) of the PWM signal should be:
EQ 2
where 1.2V < VEXT ≤ R(kΩ) x 0.020(mA) + 1.2V and the
current multiplication ratio is according to the Electrical
Specifications table. The R value should be in the (10kΩ
to 50kΩ) range.
VH = VEXT and 0 < VL < 0.6V.
The frequency of the PWM signal should be in the range
from 50Hz to 1kHz. The VEXT amplitude sets the
maximum LED current, while the duty cycle of the PWM
signal sets the average current between 0mA and ILED
maximum.
25
R=10k
20
ILED (mA)
EQ 5
Open-Circuit Protection
The FAN5608 has an internal over-voltage protection
mechanism that prevents damage to the IC in a no-load
condition. If CH1 and/or CH2 LEDs are enabled in an
open-circuit condition, FAN5608 automatically sets the
duty cycle to 25%. The output voltage can reach as high
as 50V at maximum VIN (5.5V). Depending on the
capacitor’s rating, the output capacitor may be at risk in
this condition.
15
10
R=50k
5
Shutdown Mode
0
1.0
1.25
1.5
1.75
VEXT (V)
2
Each channel can be independently disabled by
applying LOW logic level voltage to the appropriate A
and B inputs. When both channels are disabled, the
FAN5608 enters shutdown mode and the supply current
is reduced to less than 1μA.
2.25
Figure 7. Analog Control
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
www.fairchildsemi.com
6
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
Digital Static Control
(5)
Figure 8. A is PWM controlled; B is LOW; ILED (average) – s x 5mA, where s is the duty cycle
A Input
B Input (PWM)
30%
Duty Cycle
70%
Duty Cycle
1KHz
ILED
1KHz
OFF
0mA
(6)
Figure 9. A is HIGH and B is PWM controlled; ILED (average) – s x 15mA +5mA, where s is the duty cycle
A Input (PWM)
30%
Duty Cycle
70%
Duty Cycle
1KHz
1KHz
B Input (PWM)
30%
Duty Cycle
70%
Duty Cycle
1KHz
ILED
1KHz
0mA
OFF
(7)
Figure 10. A and B are PWM controlled; ILED (average) – s x 20mA, where s is the duty cycle
Notes:
5. Proportionally select the duty cycle to achieve a typical LED current from 1mA to 4mA.
6. Maximum PWM frequency can be 30KHz.
7. Proportionally select the duty cycle to achieve a typical LED current from 1mA to 19mA.
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
www.fairchildsemi.com
7
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
PWM Control
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
Typical Characteristics
TA=25C, VBAT = 3.6V, unless otherwise specified.
Figure 11. Peak power efficiency
Figure 12. PWM Dimming
VIN =3.6V, L=6.8uH, COUT=4.7uF, 3-LEDs/CH
Voltage at
DAC Inputs
Output Voltage
10V/Div
Input Current
500mA/Div
LED Current
20mA/Div
Startup Response
Tim e 200µS/Div
Figure 13. Startup Response
Design and Component Selection Guidelines
on the maximum output power (POUT) and the minimum
input voltage (VIN):
Inductor Selection
The inductor is one of the main components required by
the boost converter to store energy. The amount of
energy stored in the inductor and transferred to the load
is controlled by the regulator, using pulse-frequency
modulation (PFM) and pulse-skipping techniques. In most
cases, the FAN5608 operates in discontinuous conduction
mode, resulting in higher inductor current ripple.
L≤
EQ 6
where units of L, VIN, and POUT are in μH, Volt, and Watt,
respectively and T = 0.4μs is a factor depending upon
the FAN5608 internal architecture. The above
relationship is applicable up to POUT = 0.8W and
L ≥ 2.2μH . At lower inductor values, the efficiency
To ensure proper operation of the current regulator over
the entire range of conditions, select the inductor based
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
(VIN )2 × T
POUT
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8
The current feeding the string of LEDs is the sum of the
currents programmed for each channel in digital or
analog mode. Using all four inputs in digital mode, the
LED current can be programmed within the 0 to 40mA
range, according to the following table:
For any lighter load or higher VIN, the inductance may be
increased to improve the system efficiency. Application
examples are given in Figures 16 - 25.
The peak current in the inductor depends on the
maximum battery voltage and the inductance, according
to the equation:
I pk =
1.4 μS × VIN max
EQ 7
L
which gives the maximum rated current for the inductor.
For L =4.7μH and VIN = 4.2V, the inductor saturation
current should be at least 1A.
Capacitors Selection
Low ESR capacitors should be used to minimize the
input and output ripple voltage. Use of a CIN >
4.7μF/6.3V and COUT = 4.7μF/25V type X5R/X7R multilayer ceramic capacitor is recommended.
A larger value input capacitor placed as close as
possible to FAN5608 may be needed to reduce the input
voltage ripple in noise-sensitive applications. An
additional LC filter between the battery and the
FAN5608 input can help reduce the battery ripple to the
level required by a particular application.
Driving Two Independent Strings of LEDs
For best efficiency, the two strings of LEDs driven by the
FAN5608 should have close forward voltages. This
recommendation is met when the same number and
type of LEDs are serially connected in each channel. If
the application requires the two channels be significantly
unbalanced, an external resistor may be added in series
with the shorter string of LEDs to reduce the voltage
difference between the two channels and enhance
performance. The maximum differential LEDs connected
in series to CH1 and CH2 is not recommended to
exceed three LEDs.
Driving Higher Current LEDs
To increase the LED current range to 50mA, the CH1
and CH2 outputs may be connected, as shown below:
CIN
L = 4.7µH
INDB
2.7V to 5.5V
INDA
GND
DAC Inputs
A1
B1
A2
B2
4.7µF
Specific Layout Recommendations
CH1
The FAN5608 is available in a dual Die Attach Pad
(DAP) package. One DAP is connected to GND and
another to VOUT, making it unnecessary to provide any
external connection to the DAPs. Since the internal
power dissipation is low, the 4x4mm MLP package is
capable of dissipating maximum power without requiring
an extra copper field on the printed circuit board. When
viewing the bottom of the dual-DAP device package, two
electrically isolated exposed metal islands are visible.
The two IND pins should be connected externally.
Depending on the application noise sensitivity, an
external filter may be required between the battery and
the IC input.
CH2
Figure 14. Digital Brightness Control
CIN
2.7V to 5.5V
L = 4.7µH
INDB
VIN
VEXT
INDA
GND
A1
CH1
A2
CH2
4.7µF
Figure 15. Analog Brightness Control
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
www.fairchildsemi.com
9
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
decreases due to the resistive loss in the switching
power FET. Using L = 3.3μΗ and increasing the load to
12 LED x 20mA (POUT = 800mW) requires VIN > 3.5V to
maintain a constant 20mA current through LEDs. An
inductance L = 4.7μH ensures proper operation for 2 x 4
white LEDs with regulated 20mA current if VIN > 2.7V.
2.7V to 5.5V
L = 6.9µH
DAC Input for CH1
DAC Input for CH2
INDB
INDA
VIN
VOUT
A1
FAN5608DHMPX
A2
VOUT
4.7µF
GND
CH2
B1
CH1
B2
NC
Figure 16. FAN5608 with four LEDs
2.7V to 5.5V
Figure 17. FAN5608 efficiency with four LEDs
L = 6.8µH
DAC Input for CH1
DAC Input for CH2
INDB
INDA
VIN
VOUT
A1
FAN5608DHMPX
A2
VOUT
4.7µF
GND
CH2
B1
CH1
B2
NC
Figure 18. FAN5608 with six LEDs
2.7V to 5.5V
Figure 19. FAN5608 efficiency with six LEDs
L = 4.7µH
DAC Input for CH1
DAC Input for CH2
INDB
INDA
VIN
VOUT
A1
A2
FAN5608DHMPX
VOUT
4.7µF
GND
CH2
B1
CH1
B2
NC
Figure 20. FAN5608 with eight LEDs
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
Figure 21. FAN5608 efficiency with eight LEDs
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10
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
FAN5608 Efficiency Curves
L = 3.3µH
DAC Input for CH1
DAC Input for CH2
INDB
INDA
VIN
VOUT
A1
A2
FAN5608DHMPX
VOUT
4.7µF
GND
CH2
B1
CH1
B2
NC
Figure 22. FAN5608 with ten LEDs
2.7V to 5.5V
Figure 23. FAN5608 efficiency with ten LEDs
L = 2.7µH
DAC Input for CH1
DAC Input for CH2
INDB
INDA
VIN
VOUT
A1
A2
FAN5608DHMPX
VOUT
4.7µF
GND
CH2
B1
CH1
B2
NC
Figure 24. FAN5608 with twelve LEDs
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
Figure 25. FAN5608 efficiency with twelve LEDs
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11
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
2.7V to 5.5V
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
Dimensional Outline Drawings
Dimensions are in millimeters unless otherwise noted.
Figure 26. 4x4mm 12-Lead MLP
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
www.fairchildsemi.com
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Advance Information
Formative or In
Design
This datasheet contains the design specifications for product
development. Specifications may change in any manner without
notice.
Definition
Preliminary
First Production
This datasheet contains preliminary data; supplementary data will
be published at a later date. Fairchild Semiconductor reserves the
right to make changes at any time without notice to improve design.
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Semiconductor reserves the right to make changes at any time
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Obsolete
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This datasheet contains specifications on a product that has been
discontinued by Fairchild Semiconductor. The datasheet is printed
for reference information only.
Rev. I20
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
www.fairchildsemi.com
13
FAN5608 Serial / Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
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