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FAN5608DMPX 데이터시트 PDF




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부품번호 FAN5608DMPX 기능
기능 Serial/Parallel LED Driver with Current-Regulated/ Step-Up DC/DC Converter
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FAN5608DMPX 데이터시트, 핀배열, 회로
www.fairchildsemi.com
FAN5608
Serial/Parallel LED Driver with Current-Regulated,
Step-Up DC/DC Converter
Features
• Two Independent Channels Drive up to Six LEDs per
Channel
• Adaptive Output Voltage Drive to Maximize Efficiency
• PWM/PFM Mode of Operation of the Boost Circuit
• Up to 85% Efficiency
• Up to 2 × 20mA Output
• Two Built-in DACs for Independent (Digital) Brightness
Control for Both Channels
• LED’s Current Can be Duty-Cycle-Modulated between
0 to 20mA
• Digital, Analog, and PWM Brightness Control
• 2.7V to 5V Input Voltage Range
• 0.5MHz Operating Frequency (8MHz internal clock)
• Soft Start
• Low Shutdown Current: ICC < 1µA
• LED Short Circuit Protection
• Minimal External Components Needed
• Available in space saving 8-lead and 12-lead MLP
Packages.
Applications
• Cell Phones
• Handheld Computers
• PDAs, DSCs, MP3 Players
• Keyboard Backlights
• LED Displays
Description
The FAN5608 LED driver generates regulated output cur-
rents from a battery with input voltage varying between 2.7V
to 5V. An internal NMOS switch drives an external inductor,
and a Schottky diode delivers the inductor’s stored energy to
the load. Proprietary internal circuitry continuously monitors
the currrent on both strings and automatically adjusts the
generated output DC voltage to the lowest minimum value
required by the LEDs string with the highest summarized
forward voltage. This adaptive nature of the FAN5608
ensures operation at the highest possible efficiency. Soft start
circuitry prevents excessive current drawn from the supply
during power on. Any number of LEDs can be connected in
series as long as the summed forward voltages do not exceed
the specified operating output voltage range. Although it is
not required to have an equal number of LEDs connected in
series within each branch, the highest efficiency and best
current regulation is always achieved when an equal number
of LEDs are serially connected.
In the FAN5608 device, two internal two-bit D/A converters
provide independent programmability of each output channel
current. Analog programming of the output current is
also possible in the FAN5608. To do this, ground the "B"
pins and connect a resistor between the "A" pins and a
fixed supply voltage. The output current can then be
programmed to any desired value within its specified range.
The FAN5608DMPX/FAN5608MPX version uses a single
Typical Application
Digital Brightness Control
CIN
2.7V to 5V
L = 4.7µH
DAC Input For CH1
DAC Input For CH2
IND
VIN
A1
B1
A2
B2
IND
VOUT
GND
CH2
CH1
NNCN
4.7µF
VOUT
CIN
2.7V to 5V
L = 4.7µH
DAC Input For CH1
DAC Input For CH2
IND
VIN
A1
B1
A2
B2
IND
NC
GND
CH2
CH1
NC
4.7µF
VOUT
4X4mm MLP-12 Package
with internal Schottky diode
Order Code: FAN5608DHMPX
4X4mm MLP-12 Package
with external Schottky diode
Order Code: FAN5608HMPX
REV. 1.0.3 6/28/04




FAN5608DMPX pdf, 반도체, 판매, 대치품
PRODUCT SPECIFICATION
FAN5608
Absolute Maximum Ratings
Parameter
VIN, A, B Voltage to GND
VOUT to GND
CH1, CH2 Voltage to GND
Any LED Short Circuit Duration (Anode to Cathode)
Lead Soldering Temperature (10 seconds)
Thermal Resistance θjc
Operating Junction Temperature Range
Storage Temperature Range
Electrostatic Discharge (ESD) Protection (Note 1, 2)
Min
-0.3
-0.3
HBM
CDM
-55
4
1
Typ Max Unit
6V
24 V
8V
Indefinite
300 °C
8 °C/W
150 °C
150 °C
kV
DC Electrical Characteristics
(VIN = 2.7V to 5V, TA = 25°C, unless otherwise noted. Boldface values indicate specifications over the ambient
operating temperature.)
Parameter
Output Current Accuracy
Channel to Channel Current Matching
Efficiency (AVG)
Conditions
A = HIGH,
B = HIGH
A = HIGH,
B = HIGH
VIN > 3.0V
Min.
Typ.
Max. Units
0.9 × INOM INOM = 20 1.1 × INOM mA
3%
80 %
Switching Frequency
Multiplication Ratio
FAN5608DMPX/
FAN5608MPX
FAN5608DHMPX/
FAN5608HMPX
Supply Current in OFF mode
Input A1, A2 Threshold
Digital
Mode
Input B Threshold
Analog Mode
Digital Mode
Input A1, A2 Current
Digital Mode
Input B1, B2 Current
Digital Mode
0.5 MHz
900
1000
1100
850
1000
1150
VA = VB = 0V
High
Low
VIN-0.7
0
0.1
µA
VIN V
0.6
1.2
High
Low
VA = VIN
VA = 0
0.6 × VIN
VIN V
0 0.3 × VIN
50 60 µA
0.1 µA
0.1 µA
Recommended Operating Conditions
Parameter
Min Typ Max
Input Voltage Range
2.7 5
Operating Ambient Temperature Range
-40 25 85
Output Voltage Range
VIN 18
Notes:
1. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
2. Avoid positive polarity ESD stress at the cathode of the internal Schottky diode.
Unit
V
°C
V
4 REV. 1.0.3 6/28/04

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FAN5608DMPX 전자부품, 판매, 대치품
FAN5608
PRODUCT SPECIFICATION
PWM Control
1. A is PWM Controlled, B is Low. ILED (Average) = δ x 5mA, where δ is Duty Cycle. (Note 3)
A Input (PWM)
ss
B Input (0)
30%
Duty Cycle
1KHz
ss
ILED
0mA
ILED
(Average)
=
0.3
x
5mA
=
1.5mA
ss
70%
Duty Cycle
1KHz
ss
ILED (Average) = 0.7 x 5mA = 3.5mA
OFF
2. A is High and B is PWM. ILED (Average) = 5mA + δ x 15mA, where δ is Duty Cycle. (Note 4)
A Input
ss
B Input (PWM) ss
ILED
0mA
30%
Duty Cycle
1KHz
ss ss
70%
Duty Cycle
1KHz
ILED (Average) = 0.7 x 20mA + 0.3 x 5mA = 15.5mA
ILED (Average) = 0.3 x 20mA
+ 0.7 x 5mA = 9.5mA
ss
OFF
3. A and B are PWM. ILED (Average) = δ x 20mA, where δ is Duty Cycle. (Note 5)
A Input (PWM)
ss
30%
Duty Cycle
1KHz
ss
70%
Duty Cycle
1KHz
ss
B Input (PWM) ss
30%
Duty Cycle
1KHz
ss
ILED
0mA
ILED (Average) = 0.3 x 20mA = 6mA
ss
70%
Duty Cycle
1KHz
ss
ILED (Average) = 0.7 x 20mA = 14mA
OFF
Notes:
3. Proportionally select the duty cycle to achieve a typical LED current between 1mA to 4mA.
4. Maximum PWM frequency can be 30KHz.
5. Proportionally select the duty cycle to achieve a typical LED current between 1mA and 19mA.
REV. 1.0.3 6/28/04
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부품번호상세설명 및 기능제조사
FAN5608DMPX

Serial/Parallel LED Driver with Current-Regulated/ Step-Up DC/DC Converter

Fairchild Semiconductor
Fairchild Semiconductor

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