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FAN5609MTCX 데이터시트 PDF




Fairchild Semiconductor에서 제조한 전자 부품 FAN5609MTCX은 전자 산업 및 응용 분야에서
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부품번호 FAN5609MTCX 기능
기능 LED Driver with Adaptive Charge Pump DC/DC Converter
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FAN5609MTCX 데이터시트, 핀배열, 회로
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




FAN5609MTCX pdf, 반도체, 판매, 대치품
FAN5609
Block Diagram
VIN Linear
Regulator
A
DAC
B
On Off
And
Current Range
Oscillator
Voltage
Selector
D
R
I
V
E
R
S
PRODUCT SPECIFICATION
1µF
Power
Good
P
U
M
P
VOUT
Ref1
Bandgap
Reference
Reference
Range Selection
Low Battery Ref.
Regulator
Ref3
GND
Mode Change
VIN
Ref4 (BG)
Analog
Detector
Ref2
5µF
1µF
Circuit Description
The FAN5609’s switched capacitor DC/DC converter auto-
matically configures its internal switches to achieve high effi-
ciency and to provide tightly regulated output currents for
the LEDs. An analog detector determines which diode
requires the highest voltage in order to sustain the pre-set
current levels, and adjusts the pump regulator accordingly.
Every diode has its own linear current regulator. In addition,
a voltage regulator controls the output voltage when the bat-
tery voltage is within a range where linear regulation can
provide maximum possible efficiency. If the battery voltage
is too low to sustain the diode current in the linear mode,
a fractional 3:2 charge pump is enabled. When the battery
voltage drops further and this mode is no longer sufficient to
sustain proper operation, the pump is automatically reconfig-
ured to operate in 2:1 mode. As the battery discharges and
the voltage decays, the FAN5609 switches between modes to
maintain a constant current through LED throughout the bat-
tery life. The transition has hysteresis to prevent toggling.
Supply Voltage
The internal supply voltage for the device is automatically
selected from VIN or VOUT pins, whichever is higher.
Soft Start
The soft-start circuit limits inrush current when the device is
initially powered up and enabled. The reference voltage con-
trols the rate of the output voltage ramp-up to its final value.
Typical start-up time is 1ms. The rate of the output voltage
ramp-up is controlled by an internally generated slow ramp,
and an internal variable resistor limits the input current.
4 REV. 1.0.2 5/30/03

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FAN5609MTCX 전자부품, 판매, 대치품
PRODUCT SPECIFICATION
Digital Control with PWM (Continued)
A and B are PWM. ILED (Average) = δ x 20mA, where δ is Duty Cycle. (Note 3, 5)
FAN5609
A Input (PWM)
B Input (PWM)
30%
Duty Cycle
1KHz
30%
Duty Cycle
ss
ss
ILED
0mA
ILED (Average) = 0.3 x 20mA = 6mA
ss
70%
Duty Cycle
1KHz
70%
Duty Cycle
ILED (Average) = 0.7 x 20mA = 14mA
OFF
Notes:
5. Proportionally select the duty cycle to achieve a typical LED current between 1mA to 19mA.
Application Information
Selecting Capacitors
It is important to select the appropriate capacitor types and
the values for use with the FAN5609. These capacitors
determine parameters such as power efficiency, maximum
sustainable load current by the charge pump, input and
output ripple and start-up time.
In order to reduce ripple, both CIN and COUT should be low
ESR capacitor. Increasing the COUT capacitor reduces the out-
put ripple voltage. However this will increase the power-on
time. The CIN value controls input ripple. If necessary, this
ripple can be further reduced by powering the FAN5609
through a very small series inductor filter, as shown in Figure 3.
Input
Power
Supply
100nH
0.1µF 4.7µF
VIN
FAN5609
GND
CAP1 and CAP2 control the current capability of the charge
pump and affect the overall efficiency of the system. A lower
value will improve efficiency, but it may limit the LED’s
currents at low input voltage. A capacitor of 100nF is opti-
mal for 4 × 20 mA load over the entire input voltage range of
2.7V to 4.2V. To save space and cost, and to increase effi-
ciency, this value may be reduced to 10nF for loads less than
4 x 7mA.
Pulse-Width-Modulated (PWM) Mode
Conversion errors are minimized and the best LED to LED
matching is achieved over the entire range of average current
settings, when PWM brightness control is used to modulate
the LED current between zero and the maximum value
(A=1, B=1).
PC Board Layout
For best performance, a solid ground plane is recommended
on the back side of the PCB. The ground tails of CIN and
COUT should be connected together close to the GND pin of
IC.
Figure 3.
REV. 1.0.2 5/30/03
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관련 데이터시트

부품번호상세설명 및 기능제조사
FAN5609MTCX

LED Driver with Adaptive Charge Pump DC/DC Converter

Fairchild Semiconductor
Fairchild Semiconductor

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