FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Features Description ■ 3-Channel Parallel LED Driver for a Large Range of 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. ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 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 < 1µA 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 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 0.1µF to 1µF bucket capacitors, a 4.7µF input capacitor and a 1µF output capacitor are needed for proper operation. The FAN5616 is available in a 3x3mm 16-lead MLP package. Applications ■ Cell Phones ■ PDAs, DSCs, and MP3 Players Ordering Information Product Number Package Type Order Code FAN5616 3x3mm 16-Lead MLP FAN5616MPX ©2005 Fairchild Semiconductor Corporation FAN5616 Rev. 1.0.0 1 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump November 2005 FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump RSET EN1 EN2 GND Typical Application 16 15 14 VIN CIN 13 1 NC 2 NC 3 12 11 P1 (GND) CAP1 CAP2 10 9 4 5 6 7 8 VOUT COUT Figure 1. Typical Application Pin Assignment RSET 1 NC 2 NC LED- 3 EN2 EN1 GND VIN Top View 16 15 13 14 P1 (GND) 4 7 CAP2- 11 10 CAP1CAP1+ 9 CAP2+ 8 PGND VOUT 6 LEDLED- 5 12 3x3mm 16-Lead MLP Figure 2. Pin Assignment 2 FAN5616 Rev. 1.0.0 www.fairchildsemi.com Pin No. Pin Name Pin Description P1 GND Ground. P1 must be soldered to the PCB ground. 1 RSET RSET Pin. Connect this pin to the resistor used to set the maximum LED current. 2 NC No Connection. 3 NC No Connection. 4 LED- 1st LED Cathode. Connect this pin to the LED’s cathode. 5 LED- 2nd LED Cathode. Connect this pin to the LED’s cathode. 6 LED- 7 PGND Power Ground. 3rd LED Cathode. Connect this pin to the LED’s cathode. 8 VOUT Output Voltage. Connect this pin to all of the LED’s anodes. 9 CAP2+ Bucket Capacitor 2. Connect this pin to the positive terminal of the bucket capacitor. 10 CAP1+ Bucket Capacitor 1. Connect this pin to the positive terminal of the bucket capacitor. 11 CAP1- Bucket Capacitor 1. Connect this pin to the negative terminal of the bucket capacitor. 12 CAP2- Bucket Capacitor 2. Connect this pin to the negative terminal of the bucket capacitor. 13 VIN 14 GND Ground. 15 EN1 Enable Input. 16 EN2 Enable Input. Supply Voltage Input. 3 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Pin Description Parameter Min Max Unit -0.3 6 V GND – 0.3 VIN + 0.3 V -0.3 VIN + 0.3 V 8 °C/W Lead Soldering Temperature (10 seconds) 260 °C Junction Temperature 150 °C 150 °C VIN, VOUT, EN1, EN2, GND Voltage On All Other Pins CAP+, CAP- to GND Thermal Resistance – Junction to Tab (θJC) (Note 2) Storage Temperature -65 Electrostatic Discharge Protection (ESD) Level (Note 3) HBM 2.5 CDM 1.5 kV Recommended Operating Conditions Parameter Supply Voltage Range Min Max Unit 2.5 5.5 V 4 V LED Forward Voltage Current Through Each LED 2 40 mA PWM Dimming Signal Frequency 0.2 50 kHz Operating Ambient Temperature -40 +85 °C Operating Junction Temperature -40 +125 °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, θJA, 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 θJA for zero air flow at 0.5W is 60°C/W. 3. Using Mil Std. 883E, method 3015.7(Human Body Model) and EIA/JESD22C101-A (Charge Device Model). 4 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Absolute Maximum Ratings (Note1) Unless otherwise noted, VIN = 2.7V to 5.5V, ILED = 2mA to 20mA, EN1 = EN2 = HIGH, TA = -40°C to +85°C. Typical values are at 25°C. Parameter Conditions Input Under-Voltage Lockout Min Typ VIN falling Max Unit 1.6 V VIN rising 2.3 ILED/ISET Ratio VIN = 3.6V, IOUT = 15mA 240 255 270 ILED/ISET Ratio ILED = 2 to 20mA 230 260 280 ILED/ISET Ratio EN1 = HIGH, EN2 = LOW 86 EN1 = LOW, EN2 = HIGH 173 Current Matching with Unmatched LEDs (Note 1) 2mA ≤ ILED ≤ 15mA 2.8V ≤ LED VF <4V 0.6 +3 % 588 600 612 mV 200 270 500 µS 250 mV Reference Voltage for Current Set Start Up time COUT = 1µF, VIN = 3.6V, ILED = 15mA Minimum Cathode Voltage ILED = 15mA 170 Quiescent Current VIN = 5.5V, IOUT = 5mA 250 Shutdown Supply Current EN1 = EN2 = Logic “L” 0.1 1 µA Output Short Circuit Current VIN = 5.5V, VOUT = 0V 65 80 mA 6 V VOUT Over-voltage Protection VIN at Mode Transition from 1x to 1.5x LED Vf = 3.5V, ILED = 3 x 20mA µA 3.9 V VIN at Mode Transition from 1.5x to 2x LED Vf = 3.5V, ILED = 3 x 20mA 2.9 V Peak Efficiency (Note 2) VIN = 3.75V, LED Vf = 3.4V, ILED = 18mA 90 % Oscillator Frequency 0.8 1 1.2 MHz Thermal Shutdown Threshold 150 °C Thermal Shutdown Hysteresis 15 °C “EN1” Logic Input Low Voltage 0.4 “EN1” Logic Input High Voltage 1.6 “EN2” Logic Input Low Voltage V 0.4 “EN2” Logic Input High Voltage 1.6 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. 3 ΣV LEDi Efficiency –– x ILEDi i=1 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%. 5 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Electrical Characteristics LED Current vs. Battery Voltage Efficiency vs. Battery Voltage 21.5 100 90 ILED = 20mA 80 21.0 ILED = 15mA LED Current (mA) Efficiency (%) 70 60 ILED = 5mA 50 ILED = 10mA 40 30 20.5 85°C -40°C 20.0 19.5 25°C 19.0 20 18.5 10 0 2.2 3.2 2.7 3.7 4.2 4.7 18.0 2.2 5.2 3 3.5 Battery Voltage (V) 4.5 4 5 5.5 Battery Voltage (V) Quiescent Current vs. Battery Voltage Minimum Cathode Voltage vs. LED Current 3 0.25 ILED = 5mA 2.5 Quiescent Current (mA) Cathode Voltage (V) VIN = 5.5V 0.2 VIN = 2.7V 0.15 VIN = 3.6V 0.1 2 1.5 1 0.5 0.05 0 2 4 6 8 10 12 14 16 18 0 2.7 20 3.2 3.7 LED Current (mA) Output Voltage vs. Output Current 4.7 5.2 LED Current vs. Duty Cycle 4 18 ILED = 5mA VIN = 5.5V 3.5 VIN = 3.6V 16 FPWM = 1kHz 14 LED Current (mA) 3 Output Voltage (V) 4.2 Battery Voltage (V) VIN = 3.6V 2.5 2 1.5 1 FPWM = 10kHz 12 10 8 FPWM = 32kHz 6 4 VIN = 2.7V 0.5 2 0 0 100 200 300 400 0 500 Output Current (mA) 0 20 40 60 80 100 Duty Cycle (%) 6 FAN5616 Rev. 1.0.0 FPWM = 50kHz www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Typical Performance Characteristics Unless otherwise noted, VIN = 3.6V, TA = 25°C, CIN = 4.7µF, COUT = 1µF, CAP1 = CAP2 = 0.1µF, FAN5616 driving three LEDs with VF = 3.5V at 20mA. Unless otherwise noted, VIN = 3.6V, TA = 25°C, CIN = 4.7µF, COUT = 1µF, CAP1 = CAP2 = 0.1µF, FAN5616 driving three LEDs with VF = 3.5V at 20mA. LED Current vs. PWM Frequency 11.0 LED Current Waveform at Highest FPWM ILED = 20mA Duty Cycle = 50% 10.5 10.0 EN1 & EN2 VIN = 5.5V 9.5 High Low VIN = 3.6V 9.0 20mA 8.5 ILED VIN = 2.7V 0mA 8.0 7.5 7.0 0 10 20 30 40 50 PWM Frequency (kHz) Soft-Start Response VEN1 = VEN2 Smart Soft-Start Response PWM Signal 3.6V 0V 4V 4V VOUT VOUT 0V 0V 20mA ILED 0mA 20mA LED Current 0mA 200µs/div 7 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Typical Performance Characteristics (Continued) 1µF Linear Regulator VIN V OUT Voltage Selector EN1 EN2 Power Good Drivers Pump Oscillator Bandgap Reference Reference 5µF Range Selection Low Battery Ref. Ref1 Ref2 Regulator I. LIM. Analog Detector I. LIM. On Off and LED Current Control I. LIM. VSET Ref3 Mode Change VIN Ref4 (BG) GND 1µF Figure 3. Block Diagram Circuit Description modes to maintain a constant current through the LEDs throughout the battery life. This transition has hysteresis to prevent toggling. 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 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 150°C, a reset occurs and remains in effect until the die cools to 135°C. At which time the circuit will restart and resume normal operation. 8 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Block Diagram VIN VOUT CAP1 + – VOUT = 2 x VIN + CAP2 – GND COUT GND Figure 4. Switch Configuration Smart Soft-Start is at least 250µS 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). 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 500µS 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” The following formula explains the relationship between duty cycle (D) and soft-start VOUT ramp time (TSTR), 250µS TSTR ~ ~ D Where, D = TON +TOFF For example, a PWM signal with a 50% duty ratio (D=0.5) generates a 500µS soft-start VOUT ramp. 9 FAN5616 Rev. 1.0.0 T ON www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump VIN FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump VIN Smart Soft-Start Smart Soft-Start Device in Low Power VOUT 250µS 250µS EN1/EN2 < 5mS > 5mS Figure 5. Smart Soft-Start Timing Smart Soft-Start VOUT TSTR = 500µS 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”) R SET = RSET (kΩ) 7.8 15.6 31.2 62.4 ILED-MAX (mA) 20 10 5 2.5 10 FAN5616 Rev. 1.0.0 156 ILED www.fairchildsemi.com 100 Average LED Current (%) 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. Table 2. LED Dimming with Internal 2-bit DAC EN2 EN1 LED Current % of Maximum 0 0 0% 0 1 33.3% (1/3) 1 0 66.7% (2/3) 1 1 100% (3/3) 0 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. 100 The brightness control using a variable DC voltage is shown in Figure 8. If R1 = 78kΩ, R2 = 7.8kΩ, adjusting VEXT in the 0V to 0.6V range results in dimming the LED current from 22mA to 2mA. ISET FAN5616 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 ILED = Average ILED Adjustment Range LOW TOGGLE 3% to 30% of ILED-MAX HIGH TOGGLE 70% to 97% of ILED-MAX TOGGLE LOW 6% to 60% of ILED-MAX TOGGLE HIGH 39% to 93% of ILED-MAX TOGGLE TOGGLE 10% to 90% of ILED-MAX R1 R2 VEXT 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%. EN1 50 PWM Signal Duty Cycle (%) 4. Dimming with DC Voltage For example, if RSET = 7.8kΩ 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. EN2 0 Figure 7. Ideal PWM Dimming Response 3. PWM Control Enable Input Pins 50 156 (156 – 260 x VEXT ) + mA R1 R2 Where, 0V < VEXT < 0.6V (1+R2/R1) and R1 and R2 are in kΩ. 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. 11 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump 2. Digital Control PCB Layout Considerations 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. 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. 0.22Ω Input Power Supply VIN 10µF 4.7µF FAN5616 GND Figure 9. Battery Ripple Reduction Two MLCC bucket capacitors of 0.1µF to 1µF should be used for best efficiency in boost mode. For better ILED regulation, 1µF bucket capacitors are recommended particularly when ILED > 25mA and the battery discharges below 3V. Figure 10. Recommended PCB Layout 12 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Selecting Capacitors 3x3mm 16-Lead MLP 3.30 2.16 1.75 3.0 2.16 1.75 3.0 PIN #1 IDENT 3.30 0.57 0.30 TYP TOP VIEW 0.50 TYP 0.80 MAX RECOMMENDED LAND PATTERN 0.20 0.05 0.00 SEATING PLANE SIDE VIEW 0.40 0.30 1.75 1.65 5 8 4 9 1.75 1.65 1 12 16 PIN #1 IDENT 0.50 13 0.18~0.30 0.50 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 13 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump Mechanical Dimensions 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. ACEx™ FAST® ActiveArray™ FASTr™ Bottomless™ FPS™ Build it Now™ FRFET™ CoolFET™ GlobalOptoisolator™ CROSSVOLT™ GTO™ DOME™ HiSeC™ EcoSPARK™ I2C™ 2 E CMOS™ i-Lo™ EnSigna™ ImpliedDisconnect™ FACT™ IntelliMAX™ FACT Quiet Series™ Across the board. Around the world.™ The Power Franchise® Programmable Active Droop™ ISOPLANAR™ LittleFET™ MICROCOUPLER™ MicroFET™ MicroPak™ MICROWIRE™ MSX™ MSXPro™ OCX™ OCXPro™ OPTOLOGIC® OPTOPLANAR™ PACMAN™ POP™ Power247™ PowerEdge™ PowerSaver™ PowerTrench® QFET® QS™ QT Optoelectronics™ Quiet Series™ RapidConfigure™ RapidConnect™ µSerDes™ ScalarPump™ SILENT SWITCHER® SMART START™ SPM™ Stealth™ SuperFET™ SuperSOT™-3 SuperSOT™-6 SuperSOT™-8 SyncFET™ TinyLogic® TINYOPTO™ TruTranslation™ UHC™ UltraFET® UniFET™ VCX™ Wire™ 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 FAIRCHILDíS 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 Product Status Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary First Production 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. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. 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 14 FAN5616 Rev. 1.0.0 www.fairchildsemi.com FAN5616 High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump TRADEMARKS