IC LED DRIVER LINEAR 8-MLP

 

FAN5613MPX

Manufacturer Part NumberFAN5613MPX
DescriptionIC LED DRIVER LINEAR 8-MLP
ManufacturerFairchild Semiconductor
TypeLinear (Non-Switching)
FAN5613MPX datasheets

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Specifications of FAN5613MPX

TopologyLinear (LDO), PWMNumber Of Outputs4
Internal DriverYesType - PrimaryBacklight
Type - SecondaryColor, White LEDVoltage - Supply3.3 V ~ 5.5 V
Mounting TypeSurface MountPackage / Case8-MLP
Operating Temperature-40°C ~ 85°CCurrent - Output / Channel40mA
Efficiency90%Number Of Segments4
Operating Supply Voltage0.3 V to 1 VMaximum Supply Current20000 uA(Typ)
Maximum Power Dissipation700 mWMaximum Operating Temperature+ 85 C
Mounting StyleSMD/SMTMinimum Operating Temperature- 40 C
Lead Free Status / RoHS StatusLead free / RoHS CompliantVoltage - Output-
Frequency-Internal Switch(s)-
Other namesFAN5613MPXTR
FAN5613MPX_NL
FAN5613MPX_NLTR
FAN5613MPX_NLTR		  
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Application Information
Operational Descripton
The regulated current through each LED is a multiplica-
tion of the I
current. The I
SET
SET
the R
value. The I
value can be calculated as:
SET
SET
I
= I
/ Current Gain
SET
LED
Reference Figure 4, the I
vs. V
SET
mate V
. The value of R
CTRL
SET
to the formula:
R
= (V
- V
) / I
SET
CONTROL
CTRL
SET
For example, with V
= 3V, a 10mA current limit
CONTROL
through the LED results in I
SET
to an approximate value of 1.2V for V
ure 4. The resulting R
value that maintains 10mA reg-
SET
ulation is 36kΩ.
The LED intensity can be adjusted by varying the duty
cycle of a square wave applied to the enable pin. Fre-
quency greater than 100Hz is best to avoid a "flickering"
effect. The maximum operation frequency is 10MHz.
Efficiency Considerations
The FAN561X driver’s low-dropout architecture can sig-
nificantly improve the efficiency compared to using sim-
ple ballast resistors. The system efficiency, defined as
the ratio between the LEDs’ power and the input sup-
plied power, can be calculated as:
(
Efficiency
V
V
=
–
IN
CATHODE
The lower the V
, the higher the system effi-
CATHODE
ciency. Efficiency can be further improved by using a
higher V
with more LEDs, as shown in Example 3.
IN
Application Notes
The ultra-low voltage drop across the FAN561X series of
LED drivers allows the devices to drive white, blue, and
other color LEDs in a wide range of input voltages. The
driver can be used in many applications. Although only
the FAN5613 is shown in all three examples, any of the
FAN561X-series LED drivers can be used in the applica-
tions presented, due to their similar operation.
Example 1: Drive low V
white or blue LEDs directly
F
from single cell Li-ion
When using white or blue low V
drivers low voltage drop, only 3.4V in V
the full 20mA LED current. At 3.1V, there is 5mA typical
current available for the LEDs. The single cell Li-ion is
utilized in applications like cell phones or digital still cam-
eras. In most cases, the Li-ion battery voltage level only
goes down to 3.0V voltage level, not down to the full dis-
charge level (2.7V) before requesting the charger.
© 2003 Fairchild Semiconductor Corporation
FAN5611/FAN5612/FAN5613/FAN5614 Rev. 1.0.9
value is determined by
V
CONTROL
graph, to esti-
CTRL
is calculated according
= 50µA. That translates
, shown in Fig-
– V
CTRL
DROP
– V
F (at 20mA)
– V
IN (at 20mA)
– V
IN (at 5mA Typical)
where V
Key advantages:
• No boost circuit is needed for the LCD or keyboard
backlight.
• Drivers are directly connected to a Li-ion battery.
• No EMI, no switching noise, no boost efficiency lost,
no capacitor, and no inductor.
Example 2: Drive high V
) V
⁄
IN
existing bus from 4.0V to 5.5V
High V
F
the range of 3.2V to 4.0V. Driving these LEDs with the
maximum current of 20mA for maximum brightness,
usually requires a boost circuit for a single cell Li-ion
voltage range. In some cases, there is already a voltage
bus in the system, which can be utilized. Due to the ultra-
low voltage drop of the FAN561X series of LED drivers to
drive high-V
only 300mV higher than the highest V
– V
DROP
– V
F (at 20mA)
– V
IN (at 20mA)
– V
IN (at 5mA Typical)
where V
LEDs, and utilizing the
F
Key advantages:
is needed for
IN
• No boost circuit is needed for LCD or keyboard
backlight.
• Driver utilizes the existing bus.
• Ultra-low voltage drop provides the full 20mA LED
current at the lowest possible voltage level.
8
V
IN
I
SET
I3
I2
I4
CTRL
FAN5613
R
SET
ON/OFF
ENABLE
GND
< 0.3V
< 3.1V (Low V
)
F
=V
+ V
= 3.4V
DROP
F
~ 3.1V
= Single cell Li-ion voltage.
IN
white or blue LEDs from
F
white or blue LEDs have forward voltage drop in
white or blue LEDs, the V
needs to be
F
IN
in the circuit.
F
< 0.3V
< 3.3V to 4.0V (High V
)
F
=V
+ V
= 3.6V to 4.3V
DROP
F
~ 3.3V
= existing bus = 3.3V to 4.3V.
IN
www.fairchildsemi.com
I1

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