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FAN5609MTCX Datasheet

  • FAN5609MTCX

  • LED Driver with Adaptive Charge Pump DC/DC Converter

  • 11頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN5609
LED Driver with Adaptive Charge Pump DC/DC
Converter
Features
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Parallel LED Driver Supports All Forward Voltages
Adaptive V
OUT
Adjustment to the Highest Diode Voltage
Internally Matched LED Current Sources
No External Components Needed to Set LED Current
Built-in Charge Pump has Three Modes of Operation:
鈥?Linear Regulation V
IN
> 4.2V
鈥?3/2 DC-DC Converter and Regulation 3.6V<V
IN
<4.2V
鈥?2/1 DC-DC Converter and Regulation 2.7V<V
IN
<3.6V
Up to 86% Ef鏗乧iency
Low EMI, Low Ripple
Up to 80mA Output Current (4
脳
20mA)
Built-in DAC for Digital or PWM Brightness Control
Can be Duty Cycle Modulated between 0 to 18mA
2.7V to 5.5V Input Voltage Range
I
CC
< 2碌A(chǔ) in Shutdown Mode
1MHz Operating Frequency
Shutdown Isolates Output from Input
Soft-Start Limits Inrush Current
Short Circuit Protection
Minimal External Components Needed
Available in a 14-lead TSSOP Package
Available in a 16-lead MLP Package
Applications
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Cell Phones
Handheld Computers
PDA, DSC, MP3 Players
Keyboard Backlight
LED Displays
Description
The FAN5609 generates regulated output current from a
battery with input voltage varying between 2.7V to 5.5V.
Switch recon鏗乬uration and fractional switching techniques
are utilized to achieve high ef鏗乧iency over the entire input
voltage range. A proprietary internal circuitry continuously
monitors each LED current loop and automatically adjusts
the generated output DC voltage to the lowest minimum
value required by the LED having the highest forward
voltage. This adaptive nature of the FAN5609 eliminates the
need for LED pre-selection (matching) and ensures opera-
tion at high ef鏗乧iency. When the input voltage is suf鏗乧iently
high to sustain the programmed current level in the LEDs,
the FAN5609 re-con鏗乬ures itself to operate as a linear
regulator, and the DC-DC converter is turned off. An internal
two-bit digital to analog converter provides programmability
of the output currents. Only two 0.1碌F bucket capacitors and
two 4.7碌F input/output capacitors are needed for proper
operation.
Soft-start circuitry prevents excessive current draw during
power on. The device has built-in short circuit protection.
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Typical Application
V
OUT
C
OUT
V
IN
C
IN
V
OUT
V
IN
IN A
LED-
LED-
LED-
LED-
CAP-
CAP2
CAP+
CAP+
CAP1
D
A
C
FAN5609
GND
IN B
CAP-
REV. 1.0.2 5/30/03

FAN5609MTCX 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - LED 驅(qū)動器

  • -

  • -

  • -

  • PWM，切換式電容器（充電泵）

  • 4

  • 是

  • 背光

  • 白色 LED

  • 800kHz ~ 1.2MHz

  • 2.7 V ~ 5.5 V

  • -

  • 表面貼裝

  • 14-TSSOP（0.173"，4.40mm 寬）

  • 14-TSSOP

  • 帶卷 (TR)

  • -40°C ~ 85°C

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