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FAN5617 Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. FAN5617
Description  High-Efficiency, Constant-Current LED Driver with TinyWire Brightness Control
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com

FAN5617 Datasheet(HTML) 1 Page - Fairchild Semiconductor

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April 2007
© 2006 Fairchild Semiconductor Corporation
FAN5617 Rev. 1.0.1
High-Efficiency, Constant-Current LED Driver with
TinyWire™ Brightness Control
Three-Channel Parallel LED Driver for a Large Range
of Forward Voltages
TinyWire™ Single-Wire Digital Brightness Control
32 Static Brightness Levels with 5-Bit Internal DAC
Adaptive VOUT Adjustment to the Highest Diode
Forward Voltage
Matched LED Currents; Matched or Unmatched LEDs
Built-in Charge Pump with Three Modes of Operation:
1x (linear), 1.5x, and 2x
Up to 90% Efficiency
Low EMI, Low Ripple
Up to 90mA Total Output Current
Drives up to Three LEDs at 30mA Each
External Resistor Sets Maximum (100%) LED Current
2.7V to 5.5V Input Voltage Range
1MHz Operating Frequency
Shutdown Isolates Output from Input, Typically <1µA
Protections: Short-Circuit; Soft-Start Limits Inrush
Minimal External Components Required
3x3mm 16-Lead MLP Package
Portable Handheld Backlight
PDAs, DVD players, Pagers, Camcorder Backlights
Portable Medical Diagnostic Equipments Display
MP3 Player Displays
Digital Still Camera Backlight
The FAN5617 is a low-ripple, low-EMI, high-efficiency,
constant-current LED driver that drives three LEDs in
parallel. The LED brightness control is programmable
interface, TinyWire™. The charge pump DC/DC
converter operates in three modes: 1X, 1.5X, and 2X
over the entire input voltage range of 2.7V to 5.5V. The
adaptive nature of the built-in charge pump eliminates
the need for LED pre-selection (matching) and delivers
high output efficiency. FAN5617 is capable of driving up
to 90mA total output current, 30mA per channel. The
driver’s built-in, proprietary auto-sense circuit ensures
the same efficiency regardless of the number of LEDs
connected. When the input voltage is insufficient to
sustain the LEDs programmable current level, the
FAN5617 reconfigures itself to operate as a linear
regulator and the charge pump circuit turns off.
The FAN5617 features Fairchild’s TinyWire™ single-
wire digital interface for LED brightness control. The
built-in 5-bit DAC provides selection of 32 dimming
levels, where each level is a percentage of the
maximum LED current set by the external resistor, RSET.
The FAN5617 includes shutdown, short-circuit, and
thermal protection circuitry.
Minimal external components are required: two bucket
capacitors (2µF and 1µF), a 4.7µF input capacitor, and a
1µF output capacitor are needed for proper operation.
The FAN5617 is available in a 3x3mm, 16-lead, molded
leadless package (MLP).
Ordering Information
Part Number
Operating Temperature Range
Packing Method
0°C to 85°C
MLP-16 3x3mm
Tape and Reel
TinyWire™ is a trademark of Fairchild Semiconductor Corporation.

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