FAN5608HMPX_NL Fairchild Semiconductor, FAN5608HMPX_NL Datasheet

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FAN5608HMPX_NL

Manufacturer Part Number
FAN5608HMPX_NL
Description
Serial/Parallel LED Driver with Current-Regulated, Step-Up DC/DC Converter
Manufacturer
Fairchild Semiconductor
Datasheet
© 2006 Fairchild Semiconductor Corporation
FAN5608 Rev. 1.0.5 • 8/8/06
FAN5608 Serial / Parallel LED Driver with
Current-Regulated, Step-Up DC/DC Converter
Features
Applications
Ordering Information
Two independent channels drive up to six LEDs
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: I
Open-load protection
Minimal external components needed
Space-saving 4x4mm 12-lead MLP packages
Cell phones
Handheld computers
PDAs, DSCs, MP3 players
Keyboard backlights
LED displays
FAN5608DHMPX
Part Number
CC
< 1μA
Pb-Free
Yes
Schottky Diode
Internal
Description
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
compensation loop continuously monitors the lowest
LED cathode voltage of both channels and adjusts the
V
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.
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.
OUT
voltage to the minimum value. The minimum V
MLP-12 4x4mm
to
Package
the
load.
The
Packing Method
Tape and Reel
proprietary
www.fairchildsemi.com
August 2006
internal
OUT

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FAN5608HMPX_NL Summary of contents

Page 1

... Keyboard backlights LED displays Ordering Information Part Number Pb-Free FAN5608DHMPX © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 Description 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 ...

Page 2

... Block Diagram Pin Configuration © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 Figure 1. Block Diagram TOP-VIEW NC V INDB OUT GND INDA 1 9 CH2 CH1 4x4mm 12-Lead MLP(QUAD) (Internal Schottky Diode) FAN5608DHMPX Figure 2. FAN5608M MLP package 2 www ...

Page 3

... Avoid positive polarity ESD stress at the cathode of the internal Schottky diode (Schottky diode cathode <1.5kV). Recommended Operating Conditions Parameter Supply Voltage V IN Output Voltage Range Ambient Temperature ( © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 HBM (1,2) CDM Conditions P <0.6W, 2 channels evenly loaded OUT 3 Min ...

Page 4

... Typical Application Digital Brightness Control C IN 2.7V to 5.5V DAC Input For CH1 DAC Input For CH2 Analog Brightness Control 4.7µH 2.7V to 5.5V V EXTERNAL © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/ 4.7µH INDA INDB GND FAN5608DHMPX B1 CH2 CH1 A2 B2 Figure 3. FAN5608 Digital Brightness Circuit ...

Page 5

... DAC inputs to logic LOW. If the external output capacitor V 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 Conditions A input LOW, B input LOW A input HIGH, B input HIGH ...

Page 6

... V EXT Figure 7. Analog Control © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 PWM Control in Digital Dynamic Mode 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 > (V ...

Page 7

... 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 (average) – 5mA, where s is the duty cycle LED 30% 1KHz (average) – ...

Page 8

... FAN5608 operates in discontinuous conduction mode, resulting in higher inductor current ripple. 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 =4.7uF, 3-LEDs/CH OUT on the maximum output power (P ...

Page 9

... V EXT Figure 15. Analog Brightness Control © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 The current feeding the string of LEDs is the sum of the currents programmed for each channel in digital or > 3.5V to analog mode. Using all four inputs in digital mode, the IN LED current can be programmed within the 0 to 40mA range, according to the following table: > ...

Page 10

... Figure 18. FAN5608 with six LEDs L = 4.7µH 2.7V to 5.5V INDB DAC Input for CH1 FAN5608DHMPX A2 B1 DAC Input for CH2 B2 Figure 20. FAN5608 with eight LEDs © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 INDA V OUT V OUT 4.7µF GND CH2 CH1 NC Figure 17. FAN5608 efficiency with four LEDs INDA ...

Page 11

... Figure 22. FAN5608 with ten LEDs L = 2.7µH 2.7V to 5.5V INDB DAC Input for CH1 FAN5608DHMPX A2 B1 DAC Input for CH2 B2 Figure 24. FAN5608 with twelve LEDs © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 INDA V OUT V OUT 4.7µF GND CH2 CH1 NC Figure 23. FAN5608 efficiency with ten LEDs INDA ...

Page 12

... Dimensional Outline Drawings Dimensions are in millimeters unless otherwise noted. © 2006 Fairchild Semiconductor Corporation FAN5608 Rev. 1.0.5 • 8/8/06 Figure 26. 4x4mm 12-Lead MLP 12 www.fairchildsemi.com ...

Page 13

... TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended exhaustive list of all such trademarks. ACEx™ GlobalOptoisolator™ ActiveArray™ GTO™ Bottomless™ HiSeC™ 2 Build it Now™ I C™ CoolFET™ ...

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