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FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
November 2005
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Features
3-Channel Parallel LED Driver for a Large Range of
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 techniques 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 preselection (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 sufficiently high to sustain the LED's programmed current level, the FAN5616 reconfigures itself to operate as a linear 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 percentage 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 0.1F to 1F bucket capacitors, a 4.7F input capacitor and a 1F output capacitor are needed for proper operation. The FAN5616 is available in a 3x3mm 16-lead MLP package.
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 < 1A 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
Ordering Information
Product Number
FAN5616
Package Type
3x3mm 16-Lead MLP
Order Code
FAN5616MPX
(c)2005 Fairchild Semiconductor Corporation
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Typical Application
EN2 GND VIN CIN
EN1
16
15
14
13 12
RSET
1
NC NC
2 3 4 5
P1 (GND)
11 10 9
CAP1
CAP2
6
7
8
VOUT COUT
Figure 1. Typical Application
Pin Assignment
Top View
EN1 GND
15 14
EN2
16
13 12
RSET NC NC LED-
VIN CAP2CAP1CAP1+ CAP2+
11 10 9 8
1 2 3 4 5 6 7
P1 (GND)
3x3mm 16-Lead MLP
Figure 2. Pin Assignment
2
PGND VOUT
LEDLED-
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Pin Description
Pin No.
P1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Pin Name
GND RSET NC NC LEDLEDLEDPGND VOUT CAP2+ CAP1+ CAP1CAP2VIN GND EN1 EN2
Pin Description
Ground. P1 must be soldered to the PCB ground. RSET Pin. Connect this pin to the resistor used to set the maximum LED current. No Connection. No Connection. 1st LED Cathode. Connect this pin to the LED's cathode. 2nd LED Cathode. Connect this pin to the LED's cathode. 3rd LED Cathode. Connect this pin to the LED's cathode. Power Ground. Output Voltage. Connect this pin to all of the LED's anodes. Bucket Capacitor 2. Connect this pin to the positive terminal of the bucket capacitor. Bucket Capacitor 1. Connect this pin to the positive terminal of the bucket capacitor. Bucket Capacitor 1. Connect this pin to the negative terminal of the bucket capacitor. Bucket Capacitor 2. Connect this pin to the negative terminal of the bucket capacitor. Supply Voltage Input. Ground. Enable Input. Enable Input.
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Absolute Maximum Ratings (Note1)
Parameter
VIN, VOUT, EN1, EN2, GND Voltage On All Other Pins CAP+, CAP- to GND Thermal Resistance - Junction to Tab (JC) (Note 2) Lead Soldering Temperature (10 seconds) Junction Temperature Storage Temperature Electrostatic Discharge Protection (ESD) Level (Note 3) HBM CDM -65 2.5 1.5
Min
-0.3 GND - 0.3 -0.3
Max
6 VIN + 0.3 VIN + 0.3 8 260 150 150
Unit
V V V C/W C C C kV
Recommended Operating Conditions
Parameter
Supply Voltage Range LED Forward Voltage Current Through Each LED PWM Dimming Signal Frequency Operating Ambient Temperature Operating Junction Temperature 2 0.2 -40 -40
Min
2.5
Max
5.5 4 40 50 +85 +125
Unit
V V mA kHz C C
Notes: 1. Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Absolute maximum ratings apply individually only, not in combination. Unless otherwise specified all other voltages are referenced to GND. 2. Junction to ambient thermal resistance, JA, is a strong function of PCB material, board thickness, thickness and number of via used, diameter of via used, available copper surface, and attached heat sink characteristics. A reasonable estimated value for JA for zero air flow at 0.5W is 60C/W. 3. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model).
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Electrical Characteristics
Unless otherwise noted, VIN = 2.7V to 5.5V, ILED = 2mA to 20mA, EN1 = EN2 = HIGH, TA = -40C to +85C. Typical values are at 25C.
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 VIN falling VIN rising
Conditions
Min
2.3 240 230
Typ
Max
1.6
Unit
V
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
255 260 86 173 0.6
270 280
+3 612 500 250 1 80 6
% mV S mV A A mA V V V %
588 COUT = 1F, 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 0.8 200
600 270 170 250 0.1 65 3.9 2.9 90 1 150 15
1.2
MHz C C
0.4 1.6 0.4 1.6
V V V V
Notes: 1. Current Matching refers to the absolute value of the difference in the current between the two LED branches.
Current Matching (%) - -
(I
LEDi
(
- ILEDj x 100
)
ILEDi + ILEDj
)
, where i, j = 1, 2 or 3
2. Efficiency is expressed as a ratio between the electrical power into the LEDs and the total power consumed from the input power supply.
Efficiency - -
V
i=1
3
LEDi
x ILEDi
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%.
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Typical Performance Characteristics
Unless otherwise noted, VIN = 3.6V, TA = 25C, CIN = 4.7F, COUT = 1F, CAP1 = CAP2 = 0.1F, FAN5616 driving three LEDs with VF = 3.5V at 20mA.
Efficiency vs. Battery Voltage
100 90 80 70 Efficiency (%) 60 50 40 30 20 10 0 2.2 2.7 3.2 3.7 4.2 4.7 5.2 18.5 18.0 2.2
ILED = 10mA ILED = 5mA ILED = 15mA ILED = 20mA
LED Current vs. Battery Voltage
21.5 21.0 20.5
85C -40C
LED Current (mA)
20.0 19.5 19.0
25C
3
3.5
4
4.5
5
5.5
Battery Voltage (V)
Battery Voltage (V)
Minimum Cathode Voltage vs. LED Current
0.25
VIN = 5.5V
Quiescent Current vs. Battery Voltage
3
ILED = 5mA
2.5 Quiescent Current (mA) 2 1.5 1 0.5
Cathode Voltage (V)
0.2
0.15
VIN = 2.7V
0.1
VIN = 3.6V
0.05
0
2
4
6
8
10
12
14
16
18
20
0 2.7
3.2
3.7
4.2
4.7
5.2
LED Current (mA)
Battery Voltage (V)
Output Voltage vs. Output Current
4
ILED = 5mA
LED Current vs. Duty Cycle
18 16 14
VIN = 3.6V FPWM = 1kHz FPWM = 10kHz
3.5 3 Output Voltage (V) 2.5 2 1.5 1
VIN = 5.5V
VIN = 3.6V
LED Current (mA)
12 10 8
FPWM = 32kHz
6 4 2
FPWM = 50kHz
VIN = 2.7V
0.5 0 0 100 200 300 400 500 Output Current (mA)
0
0
20
40
60
80
100
Duty Cycle (%)
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Typical Performance Characteristics (Continued)
Unless otherwise noted, VIN = 3.6V, TA = 25C, CIN = 4.7F, COUT = 1F, CAP1 = CAP2 = 0.1F, FAN5616 driving three LEDs with VF = 3.5V at 20mA.
LED Current vs. PWM Frequency
11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 0 10 20 30 40 50
VIN = 3.6V VIN = 5.5V ILED = 20mA Duty Cycle = 50%
LED Current Waveform at Highest FPWM
EN1 & EN2
High Low
20mA
VIN = 2.7V
ILED
0mA
PWM Frequency (kHz)
Soft-Start Response
VEN1 = VEN2
Smart Soft-Start Response
3.6V 0V 4V
PWM Signal 4V
VOUT 0V 20mA ILED 0mA
200s/div
VOUT
0V 20mA LED Current 0mA
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Block Diagram
1F
VIN
Linear Regulator
Voltage Selector
V OUT
EN1
EN2 Drivers VSET On Off and LED Current Control Oscillator Pump
Power Good
Bandgap Reference Range Selection Low Battery Ref. Ref1 Regulator
Reference Analog Detector
5F
I. LIM.
I. LIM.
Ref2 Ref3
Mode Change VIN Ref4 (BG)
GND
1F
Figure 3. Block Diagram
Circuit Description
As shown in Figure 4, the FAN5616's switch capacitor DC/DC converter automatically configures its internal switches to achieve high efficiency and to provide tightlyregulated 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 battery 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 linear mode, a fractional 3:2 charge pump is enabled. When the battery voltage drops and the mode is no longer sufficient to sustain proper operation, the pump is automatically reconfigured to operate in 2:1 mode. As the battery discharges and the voltage decays, the FAN5616 switches between
modes to maintain a constant current through the LEDs throughout the battery life. This transition has hysteresis to prevent toggling. The internal supply voltage of the device is automatically selected from the VIN or VOUT pins, whichever has a higher voltage. The FAN5616 enters shutdown mode to reduce overall current consumption when both DAC inputs (EN1 and EN2) are low.
Short Circuit and Thermal Protection
In the event of an output voltage short circuit, the output current will be limited to a typical value of 65mA. In addition, when the die temperature exceeds 150C, a reset occurs and remains in effect until the die cools to 135C. At which time the circuit will restart and resume normal operation.
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FAN5616 Rev. 1.0.0
I. LIM.
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
VIN
VIN VOUT CAP1 VOUT = 2 x VIN + -
GND
+ CAP2 -
COUT
GND
Figure 4. Switch Configuration
Smart Soft-Start
When the FAN5616 is enabled, the Smart Soft-Start circuit limits the switcher's in-rush current. Figure 5 shows the timing diagram of the Smart Soft-Start circuit and associated signals. After a power up, the FAN5616 is placed in low power mode until a logic "High" is applied to the enable (EN1/ EN2) pin enabling the device. Within the first 500S of enabling the device the output voltage (VOUT) is increased linearly until it reaches its nominal level. When a logic "Low" is applied to EN1/EN2 for more than 5mS, the device is placed in a low power mode and the output voltage is turned off. The LED current is controlled by applying a PWM signal to the EN1/EN2 pin. To avoid interference between the PWM signal and the soft-start circuit, the PWM signal applied must be faster than 200Hz but not greater than 50kHz. The soft-start circuit will be reactivated with each low to high transition on the EN1/EN2 pin. As shown in Figure 5, the PWM signal, ideally, should be controlled so that the initial logic "High"
is at least 250S before returning to its standard frequency. This allows VOUT to ramp to its nominal level. However, as shown in Figure 6, in most cases a frequency greater than a 1kHz PWM signal is applied to the EN1/EN2 pin such that the VOUT ramp rate slows accordingly. The VOUT ramp will begin during the initial high level (ON state) of the PWM signal while its voltage will be maintained during its low level (OFF state). The following formula explains the relationship between duty cycle (D) and soft-start VOUT ramp time (TSTR),
250S TSTR ~ ~ D
Where, D =
T ON TON +TOFF
For example, a PWM signal with a 50% duty ratio (D=0.5) generates a 500S soft-start VOUT ramp.
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
VIN
Smart Soft-Start VOUT Device in Low Power
Smart Soft-Start
250S
250S
EN1/EN2
< 5mS
> 5mS
Figure 5. Smart Soft-Start Timing
Smart Soft-Start VOUT
TSTR = 500S
EN1/EN2
FPWM >> 1kHz Duty Ratio = 50%
Figure 6. Smart Soft-Start Timing with 50% PWM
Application Information
LED Brightness Control Methods 1. External RSET Resistor
The external RSET resistor sets the maximum LED current for LED brightness control. The resistor value establishes the reference current needed for a constant LED current. To calculate different RSET values, use the formula below:
Table 1. Max. ILED (EN1=EN2 = Logic "High")
RSET (k) ILED-MAX (mA) 7.8 20 15.6 10 31.2 5 62.4 2.5
R SET =
156 ILED
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
2. Digital Control
A built-in 2-bit DAC is used to digitally control the LED's brightness through the EN1 and EN2 inputs. Once the desired maximum LED current is set by the external RSET resistor, the percentage of the maximum LED current is selected, as described in Table 2, to perform the dimming operation.
100
Average LED Current (%)
50
Table 2. LED Dimming with Internal 2-bit DAC EN2
0 0 1 1
EN1
0 1 0 1
LED Current % of Maximum
0% 33.3% (1/3) 66.7% (2/3) 100% (3/3)
0
0
50 PWM Signal Duty Cycle (%)
100
3. PWM Control
In addition to the digital LED brightness control, the FAN5616 features a PWM control. The LED current varies according to the width of the PWM signal applied to the EN1/EN2 input pins. Once the desired maximum LED current (ILED-MAX) is set by the external RSET resistor, the percentage of ILED-MAX to perform the dimming operation depends on the configuration of the PWM signal with respect to the 2-bit DAC inputs (EN1 and EN2) as described in Table 2. For example, if RSET = 7.8k then ILED-MAX = 20mA. If EN1 and EN2 are tied together and a PWM signal is applied, the LED current will vary between 0% and 100% (0mA and 20mA) of the maximum LED current according to the duty cycle of the PWM signal. The PWM signal can be applied to either enable input pins (EN1/EN2) or to both tied together. Depending upon the configuration, the average LED current can be adjusted within any range limited by 0, 1/3, 2/3, 3/3 of the maximum LED current as described in Table 3. The PWM duty cycle is assumed to be between 10% and 90%.
Figure 7. Ideal PWM Dimming Response 4. Dimming with DC Voltage
The brightness control using a variable DC voltage is shown in Figure 8. If R1 = 78k, R2 = 7.8k, adjusting VEXT in the 0V to 0.6V range results in dimming the LED current from 22mA to 2mA.
R2 VEXT ISET FAN5616 R1
Figure 8. DC Voltage Control
The FAN5616's internal circuit maintains a constant VSET = 0.6V. Adjusting VEXT changes the ISET and ILED accordingly. By selecting different values for R1, R2 and VEXT, the ILED variation range can be changed according to the following equation:
Table 3. Average LED Dimming Range Enable Input Pins EN2
LOW HIGH TOGGLE TOGGLE TOGGLE
EN1
TOGGLE TOGGLE LOW HIGH TOGGLE
Average ILED Adjustment Range
3% to 30% of ILED-MAX 70% to 97% of ILED-MAX 6% to 60% of ILED-MAX 39% to 93% of ILED-MAX 10% to 90% of ILED-MAX
ILED =
156 (156 - 260 x VEXT ) + mA R1 R2
Where, 0V < VEXT < 0.6V (1+R2/R1) and R1 and R2 are in k.
The recommended PWM frequency range is 200Hz to 50kHz for an acceptable linear response. At higher frequencies, the current waveform can no longer follow the PWM signal waveform, resulting in a significant difference between the value of the average ILED and the theoretical calculation.
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Selecting Capacitors
It is important to select the appropriate capacitor types and the values for use with the FAN5616. In order to reduce battery ripple, both CIN and COUT should be lowESR capacitors. If necessary, the ripple can be further reduced by powering the FAN5616 through an RC input filter, as shown in Figure 9.
0.22
PCB Layout Considerations
For best performance, a solid ground plane is recommended on the back side of the PCB. All capacitors should be placed as close to the FAN5616 as possible and connected with reasonably thick traces to minimize the ESL and ESR parasitics.
Input Power Supply
VIN 10F 4.7F
FAN5616
GND
Figure 9. Battery Ripple Reduction
Two MLCC bucket capacitors of 0.1F to 1F should be used for best efficiency in boost mode. For better ILED regulation, 1F bucket capacitors are recommended particularly when ILED > 25mA and the battery discharges below 3V.
Figure 10. Recommended PCB Layout
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
Mechanical Dimensions
3x3mm 16-Lead MLP
3.0 3.30 2.16 1.75
PIN #1 IDENT
3.0
1.75
2.16 3.30
0.57 TOP VIEW 0.50 TYP 0.80 MAX 0.20 0.05 0.00 SEATING PLANE SIDE VIEW 0.40 0.30
5
0.30 TYP
RECOMMENDED LAND PATTERN
1.75 1.65
8
4
9
1.75 1.65
1 12
0.50
PIN #1 IDENT 0.50
16
13
0.18~0.30
BOTTOM VIEW
Notes: 1. Conforms to JEDEC registration MO-220, variation weed-pending, dated pending. 2. Dimensions are in millimeters. 3. Dimensions and tolerances per ASME Y14.5M, 1994. 4. Dimensions are exclusive of burs, mold flash, and tie bar extrusions.
MLP16B rev B
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FAN5616 Rev. 1.0.0
FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks.
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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 FAIRCHILDiS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.
Rev. I17
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FAN5616 Rev. 1.0.0

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