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PDF FAN5609MTCX Data sheet ( Hoja de datos )
| Número de pieza | FAN5609MTCX | |
| Descripción | LED Driver with Adaptive Charge Pump DC/DC Converter | |
| Fabricantes | Fairchild Semiconductor | |
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www.fairchildsemi.com
FAN5609
LED Driver with Adaptive Charge Pump DC/DC
Converter
Features
• Parallel LED Driver Supports All Forward Voltages
• Adaptive VOUT 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:
– Linear Regulation VIN > 4.2V
– 3/2 DC-DC Converter and Regulation 3.6V<VIN<4.2V
– 2/1 DC-DC Converter and Regulation 2.7V<VIN<3.6V
• Up to 86% Efficiency
• Low EMI, Low Ripple
• Up to 80mA Output Current (4 × 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
• ICC < 2µA 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
• 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 reconfiguration and fractional switching techniques
are utilized to achieve high efficiency 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 efficiency. When the input voltage is sufficiently
high to sustain the programmed current level in the LEDs,
the FAN5609 re-configures 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 0.1µF bucket capacitors and
two 4.7µF 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.
Typical Application
COUT
VOUT
VIN
VOUT
VIN
LED-
LED-
LED-
CIN
D IN A
FAN5609
A
C IN B
GND
LED-
CAP-
CAP+
CAP+
CAP-
CAP2
CAP1
REV. 1.0.2 5/30/03
1 page  
PRODUCT SPECIFICATION
Switch Configuration
VIN
=VOUT 2 X VIN
GND
Figure 1
Step-up, 2:1 configuration.
Switch positions shown in charge phase.
Reverse all switches for pump phase.
VIN
+
CAP1-
+
CAP2 -
FAN5609
VOUT
COUT
GND
Figure 2
Step-up
3:2 configuration
Switch positions shown in charge phase.
Reverse all switches for pump phase.
Shutdown and Short Circuit Current Limit
Set both DAC inputs low to shut down the device. Built-in
short circuit protection limits the supply current to a maxi-
mum of 50mA.
Digital Control
A digital-to-analog converter (DAC) allows selection of the
following modes: OFF, 7mA, 14mA, 20mA, per diode.
By turning the IN B pin ON and OFF, the current can be
modulated between 7 to 20mA to achieve any IAverage value
(PWM). In PWM mode, the modulating frequency has to be
set sufficiently high in order to avoid a flickering effect
(100Hz to 1kHz).
A0101
B0011
ILED OFF 7mA 14mA 20mA
Digital Control with PWM
Any input can be modulated by a pulse train of variable duty
cycle (δ). By turning ON and OFF DAC inputs A or B, the
current can be continuously modulated to any average value
between 1 to 19mA. For a maximum range of LED current,
both A&B can be modulated at the same time.
REV. 1.0.2 5/30/03
5
5 Page 
FAN5609
Ordering Information
Product Number
FAN5609
Package Type
14-Lead TSSOP
4mmx4mm 16-Lead MLP
PRODUCT SPECIFICATION
Order Code
FAN5609MTCX
FAN5609MPX
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO
ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN;
NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
5/30/03 0.0m 005
Stock#DS30005609
2003 Fairchild Semiconductor Corporation
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet FAN5609MTCX.PDF ] | |
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