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PDF FAN5617 Data sheet ( Hoja de datos )
| Número de pieza | FAN5617 | |
| Descripción | High-Efficiency Constant-Current LED Driver | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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April 2007
FAN5617
High-Efficiency, Constant-Current LED Driver with
TinyWire™ Brightness Control
Features
Description
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
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
through Fairchild’s proprietary single-wire digital
interface, TinyWire™. The charge pump DC/DC
Adaptive VOUT Adjustment to the Highest Diode
Forward Voltage
Matched LED Currents; Matched or Unmatched LEDs
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
Built-in Charge Pump with Three Modes of Operation:
1x (linear), 1.5x, and 2x
Up to 90% Efficiency
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
Low EMI, Low Ripple
Up to 90mA Total Output Current
Drives up to Three LEDs at 30mA Each
connected. When the input voltage is insufficient to
sustain the LEDs programmable current level, the
FAN5617 reconfigures itself to operate as a linear
www.DataSheetr4eU.gcoumlator and the charge pump circuit turns off.
External Resistor Sets Maximum (100%) LED Current The FAN5617 features Fairchild’s TinyWire™ single-
2.7V to 5.5V Input Voltage Range
1MHz Operating Frequency
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
Shutdown Isolates Output from Input, Typically <1µA
Protections: Short-Circuit; Soft-Start Limits Inrush
Current
maximum LED current set by the external resistor, RSET.
The FAN5617 includes shutdown, short-circuit, and
thermal protection circuitry.
Minimal External Components Required
3x3mm 16-Lead MLP Package
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.
Applications
Portable Handheld Backlight
PDAs, DVD players, Pagers, Camcorder Backlights
Portable Medical Diagnostic Equipments Display
MP3 Player Displays
Digital Still Camera Backlight
The FAN5617 is available in a 3x3mm, 16-lead, molded
leadless package (MLP).
Ordering Information
Part Number Pb-Free Operating Temperature Range
FAN5617MPX
Yes
0°C to 85°C
TinyWire™ is a trademark of Fairchild Semiconductor Corporation.
Package
MLP-16 3x3mm
Packing Method
Tape and Reel
© 2006 Fairchild Semiconductor Corporation
FAN5617 Rev. 1.0.1
www.fairchildsemi.com
1 page  
Typical Characteristics
Unless otherwise noted, VIN = 3.6V, TA = 25°C, CIN = 4.7µF, COUT = 1µF, CAP1 = CAP2 = 0.1µF, the FAN5617 driving
three LEDs with VF = 3.3V at 20mA.
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
90
80
70
60
50
40
30
1X to 1.5X
1.5X to 2X
20
10
ILED = 20mA
ILED = 15mA
ILED = 10mA
ILED = 5mA
0
5 10 15 20 25 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
LED Current (mA)
Input Voltage (V)
Figure 3. Voltage Multiplication Ratio
vs. LED Current
1.5
Figure 4. Efficiency vs. Input Voltage
2.5
2.0
0.5
1.5
-0.5
ILED = 20mA
-1.5
2.7 3.2 3.7 4.2 4.7 5.2
Input Voltage (V)
Figure 5. LED current vs. Input Voltage
200
180
160
140
120
100
80
60
40
20
01
5 9 13
LED Current (mA)
VIN = 5.5V
VIN = 3.6V
VIN = 2.7V
17 21
Figure 7. Minimum Cathode Voltage
1.0
0.5
0 ILED = 5mA
2.7 3.2 3.7 4.2 4.7 5.2
Input Voltage (V)
Figure 6. Quiescent Current vs. Input Voltage
Figure 8. Dimming Linearity
© 2006 Fairchild Semiconductor Corporation
FAN5617 Rev. 1.0.1
www.fairchildsemi.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet FAN5617.PDF ] | |
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