IC LED DRIVR WHITE BCKLGT 12-MLP

FAN5608HMPX

Manufacturer Part NumberFAN5608HMPX
DescriptionIC LED DRIVR WHITE BCKLGT 12-MLP
ManufacturerFairchild Semiconductor
TypeBacklight, White LED (Serial Interface)
FAN5608HMPX datasheet
 


Specifications of FAN5608HMPX

TopologyPWM, Step-Up (Boost)Number Of Outputs2
Internal DriverYesType - PrimaryBacklight
Type - SecondaryWhite LEDFrequency500kHz
Voltage - Supply2.7 V ~ 5.5 VVoltage - Output24V
Mounting TypeSurface MountPackage / Case12-MLP
Operating Temperature-40°C ~ 85°CCurrent - Output / Channel20mA
Internal Switch(s)YesEfficiency85%
Number Of Segments12Operating Supply Voltage2.7 V to 5.5 V
Maximum Supply Current0.1 mAMaximum Operating Temperature+ 85 C
Mounting StyleSMD/SMTMinimum Operating Temperature- 40 C
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther namesFAN5608HMPXTR
FAN5608HMPX_NL
FAN5608HMPX_NLTR
FAN5608HMPX_NLTR
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FAN5608
Serial/Parallel LED Driver with Current-Regulated,
Step-Up DC/DC Converter
Features
• Two Independent Channels Drive up to Six LEDs per
Channel
• Adaptive Output Voltage Drive to Maximize Efficiency
• PWM/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’s Current Can be Duty-Cycle-Modulated between
0 to 20mA
• Digital, analog, and PWM brightness control
• 2.7V to 5V Input Voltage Range
• 0.5MHz Operating Frequency (8MHz internal clock)
• Soft Start
µ
• Low Shutdown Current: I
< 1
A
CC
• LED Short Circuit Protection
• Minimal External Components Needed
• Available in an 8-lead MLP and a 12-lead MLP Package
Applications
• Cell Phones
• Handheld Computers
• PDAs, DSCs, MP3 Players
• Keyboard Backlights
• LED Displays
Typical Application
L = 4.7 H
2.7V to 5V
IND
IND
V
V
OUT
IN
A1
GND
DAC Input For CH1
B1
CH2
A2
CH1
DAC Input For CH2
NN
B2
NC
4X4mm MLP-12 Package
with internal Schottky diode
Order Code: FAN5608DHMPX
Description
The FAN5608 LED driver generates regulated output cur-
rents from a battery with input voltage varying between 2.7V
to 5V. An internal NMOS switch drives an external inductor,
and a Schottky diode delivers the inductor’s stored energy to
the load. Proprietary internal circuitry continuously monitors
each LED current string and automatically adjusts the gener-
ated output DC voltage to the lowest minimum value
required by the LED’s string with the highest summarized
forward voltage. This adaptive nature of the FAN5608
ensures operation at the highest possible efficiency. Soft start
circuitry prevents excessive current drawn from the supply
during power on. Any number of LEDs can be connected in
series as long as the summed forward voltages do not lead to
exceeding the specified operating output voltage range.
Although it is not required to have an equal number of LEDs
connected in series within each branch, the highest efficiency
and best current regulation is always achieved when an equal
number of LEDs are serially connected.
In the FAN5608 device, two internal two-bit D/A converters
provide independent programmability of each output channel
current. Analog programming of the output current is also
possible in the FAN5608. To do this, ground the "B" pins and
connect a resistor between the "A" pins and a fixed supply
Analog or Digital Brightness Control
L = 4.7 H
2.7V to 5V
V
OUT
4.7µF
DAC Input For CH1
DAC Input For CH2
www.fairchildsemi.com
IND
IND
V
OUT
V
NC
IN
4.7µF
A1
GND
B1
CH2
CH1
A2
B2
NC
4X4mm MLP-12 Package
with external Schottky diode
Order Code: FAN5608HMPX
REV. 0.8.3 5/29/03

FAN5608HMPX Summary of contents

  • Page 1

    ... Analog or Digital Brightness Control L = 4 OUT 4.7µF DAC Input For CH1 DAC Input For CH2 www.fairchildsemi.com IND IND V OUT 4.7µF A1 GND B1 CH2 CH1 4X4mm MLP-12 Package with external Schottky diode Order Code: FAN5608HMPX REV. 0.8.3 5/29/03 ...

  • Page 2

    FAN5608 voltage. The output current can then be programmed to any desired value within its FAN5608DMPX/FAN5608MPX version uses a single exter- nal resistor to set the current, and to turn the device ON and OFF. The FAN5608DMPX/FAN5608MPX is available in ...

  • Page 3

    ... IN IN CH1 GND CH2 3 6 CH2 IND IND 4 OUT 3x3mm 8-Lead MLP 3x3mm 8-Lead MLP (Internal Schottky Diode) (External Schottky Diode) FAN5608DMPX/FAN5608MPX Pin Descriptions Pin No. FAN5608DHMPX FAN5608HMPX 1 GND 2 CH1 CH2 9 IND 10 IND 11 V OUT 12 NC REV. 0.8.3 5/29/03 TOP-VIEW A1 8 CH1 ...

  • Page 4

    ... 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. 4 Conditions A = HIGH HIGH A = HIGH HIGH V > 3.0V IN FAN5608DMPX/ FAN5608MPX FAN5608DHMPX/ FAN5608HMPX Digital High Mode Low Analog Mode Digital Mode High Low Preliminary Data Sheet ...

  • Page 5

    Preliminary Data Sheet Block Diagram DAC1 A1 B2 DAC2 A2 GND Note: In the 8-pin version (analog version only), pins B1 and B2 are omitted. Circuit Description When the input voltage is connected to V turned on, ...

  • Page 6

    Preliminary Data Sheet Digital Control The FAN5608’s digital decoder allows selection of the fol- lowing modes of operation: OFF, 5mA, 10mA, 20mA per branch OFF 5mA 10mA LED Analog Control with ...

  • Page 7

    Preliminary Data Sheet PWM Control (Continued High and B is PWM. I LED A Input B Input (PWM) I LED 0mA 3. A and B are PWM. I (Average) = LED A Input (PWM) B Input (PWM) ...

  • Page 8

    FAN5608 Applications Information 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 ...

  • Page 9

    Preliminary Data Sheet Application Examples 1. Driver For Four White LEDs L = 6 IND IND V V OUT IN A1 GND DAC Input For CH1 B1 CH2 A2 CH1 DAC Input For CH2 NN B2 ...

  • Page 10

    FAN5608 4. Driver For Twelve White LEDs L = 4 IND IND V V OUT IN A1 GND DAC Input For CH1 B1 CH2 A2 CH1 DAC Input For CH2 Note: Refer to ...

  • Page 11

    Preliminary Data Sheet Mechanical Dimensions 4x4mm 12-Lead MLP (Internal Schottky Diode) REV. 0.8.3 5/29/03 GND V OUT FAN5608 11 ...

  • Page 12

    FAN5608 Mechanical Dimensions 4x4mm 12-Lead MLP (External Schottky Diode) 12 Preliminary Data Sheet REV. 0.8.3 5/29/03 ...

  • Page 13

    Preliminary Data Sheet Mechanical Dimensions 3x3mm 8-Lead MLP (Internal Schottky Diode) REV. 0.8.3 5/29/03 V OUT GND FAN5608 13 ...

  • Page 14

    FAN5608 Mechanical Dimensions 3x3mm 8-Lead MLP (External Schottky Diode) 14 Preliminary Data Sheet REV. 0.8.3 5/29/03 ...

  • Page 15

    ... 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 affect its safety or effectiveness. 2003 Fairchild Semiconductor Corporation FAN5608 Order Code FAN5608HMPX FAN5608DMPX FAN5608MPX REV. 0.8.3 5/29/03 ...