FAN5616 Datasheet PDF - Fairchild Semiconductor
| Part Number | FAN5616 | |
| Description | Constant-Current LED Driver | |
| Manufacturers | Fairchild Semiconductor | |
| Logo |  |
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November 2005
FAN5616
High-Efficiency, Constant-Current LED Driver with
Adaptive Charge Pump
Features
■ 3-Channel Parallel LED Driver for a Large Range of
Forward Voltages
■ Adaptive VOUT Adjustment to the Highest Diode
Forward Voltage
■ Internally Matched LED Current Sources
■ Matched LED Currents with Matched or Unmatched
LEDs
■ Built-in Charge Pump with Three Modes of Operation:
1x, 1.5x, and 2x
■ Up to 90% Efficiency
■ Up to 50kHz PWM Dimming Frequency
■ Low EMI, Low Ripple
■ Up to 120mA Output Current
■ Drives up to 3 LEDs at 40mA each
■ External Resistor to Set Maximum (100%) LED
Current
■ Built-in 2-bit DAC to Control LED Current in Digital
Mode
■ 2.5V to 5.5V Input Voltage Range
■ ICC < 1µA in Shutdown Mode
■ 1MHz Operating Frequency
■ Shutdown Isolates Output from Input
■ Smart Soft-Start Limits In-Rush Current
■ Short Circuit Protection
■ Minimal External Components Needed
■ Available in a 3x3mm 16-lead MLP Package
Applications
■ Cell Phones
■ PDAs, DSCs, and MP3 Players
Description
The FAN5616 generates a regulated output current from
a battery with an input voltage between 2.7V to 5.5V.
Switch reconfiguration and fractional switching tech-
niques are utilized to achieve high efficiency over the
entire input voltage range. The adaptive nature of the
built-in charge pump eliminates the need for LED pre-
selection (matching) and ensures operation with high
efficiency. The driver's built-in, proprietary, auto-sense
circuitry ensures the same high efficiency regardless of
the number of LEDs. When the input voltage is suffi-
ciently high to sustain the LED’s programmed current
level, the FAN5616 reconfigures itself to operate as a lin-
ear regulator, and the charge pump is turned off.
The FAN5616 supports both digital and PWM LED
brightness control methods. The built-in 2-bit DAC offers
a selection of four LED current levels, each level is a per-
centage of the maximum LED current set by the external
RSET resistor.
The FAN5616 includes built-in shutdown, short circuit
and thermal protection circuitry. A built-in smart soft-start
circuitry prevents excessive current draw during power
on while allowing for an increased PWM frequency for
dimming.
Minimal external components are required. Only two
0.1µF to 1µF bucket capacitors, a 4.7µF input capacitor
and a 1µF output capacitor are needed for proper opera-
tion.
The FAN5616 is available in a 3x3mm 16-lead MLP
package.
Ordering Information
Product Number
FAN5616
Package Type
3x3mm 16-Lead MLP
Order Code
FAN5616MPX
©2005 Fairchild Semiconductor Corporation
FAN5616 Rev. 1.0.0
1
www.fairchildsemi.com
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Electrical Characteristics
Unless otherwise noted, VIN = 2.7V to 5.5V, ILED = 2mA to 20mA, EN1 = EN2 = HIGH, TA = -40°C to +85°C. Typical
values are at 25°C.
Parameter
Input Under-Voltage Lockout
ILED/ISET Ratio
ILED/ISET Ratio
ILED/ISET Ratio
Current Matching with Unmatched
LEDs (Note 1)
Reference Voltage for Current Set
Start Up time
Minimum Cathode Voltage
Quiescent Current
Shutdown Supply Current
Output Short Circuit Current
VOUT Over-voltage Protection
VIN at Mode Transition from 1x to 1.5x
VIN at Mode Transition from 1.5x to 2x
Peak Efficiency (Note 2)
Oscillator Frequency
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
“EN1” Logic Input Low Voltage
“EN1” Logic Input High Voltage
“EN2” Logic Input Low Voltage
“EN2” Logic Input High Voltage
Conditions
VIN falling
VIN rising
VIN = 3.6V, IOUT = 15mA
ILED = 2 to 20mA
EN1 = HIGH, EN2 = LOW
EN1 = LOW, EN2 = HIGH
2mA ≤ ILED ≤ 15mA
2.8V ≤ LED VF <4V
COUT = 1µF, VIN = 3.6V,
ILED = 15mA
ILED = 15mA
VIN = 5.5V, IOUT = 5mA
EN1 = EN2 = Logic “L”
VIN = 5.5V, VOUT = 0V
LED Vf = 3.5V, ILED = 3 x 20mA
LED Vf = 3.5V, ILED = 3 x 20mA
VIN = 3.75V, LED Vf = 3.4V,
ILED = 18mA
Min Typ Max Unit
1.6 V
2.3
240 255 270
230 260 280
86
173
0.6 +3
%
588 600 612 mV
200 270 500
µS
170 250 mV
250 µA
0.1 1 µA
65 80 mA
6V
3.9 V
2.9 V
90 %
0.8 1 1.2 MHz
150 °C
15 °C
0.4 V
1.6 V
0.4 V
1.6 V
Notes:
1. Current Matching refers to the absolute value of the difference in the current between the two LED branches.
( ( ) )Current Matching (%) ––
ILEDi – ILEDj
x 100
, where i, j = 1, 2 or 3
ILEDi + ILEDj
2. Efficiency is expressed as a ratio between the electrical power into the LEDs and the total power consumed from
the input power supply.
Σ3
VLEDi x ILEDi
Efficiency ––
i=1
VIN x IIN
Some competitors calculate the efficiency as a function of VOUT instead of LED VF. Their method does not account
for the power lost due to the cathode voltage not being equal to zero. This method allows them to provide an
“improved” efficiency up to 5%.
FAN5616 Rev. 1.0.0
5
www.fairchildsemi.com
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for FAN5616 electronic component. |
| Information | Total 14 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ FAN5616.PDF Datasheet ] | |
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