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ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor's product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. "Typical" parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Features Description The FAN5333A/FAN5333B is a general purpose LED driver that features fixed frequency mode operation and an integrated FET switch. The device's high output power makes it suitable to drive flash LEDs in serial connections. This device is designed to operate at high switching frequencies in order to minimize switching noise measured at the battery terminal of hand-held communications equipment. Quiescent current in both normal and shutdown mode is designed to be minimal in order to extend battery life. Normal or shutdown mode can be selected by a logic level shutdown circuitry. 1.5MHz Switching Frequency Low Noise Adjustable Output Voltage Up to 1.5A Peak Switch Current 1.5W Output Power Capability Low Shutdown Current: <1A Cycle-by-Cycle Current Limit Low Feedback Voltage Over-Voltage Protection Fixed-Frequency PWM Operation Internal Compensation FAN5333A has 110mV Feedback Voltage FAN5333B has 315mV Feedback Voltage Thermal Shutdown 5-Lead SOT23 Package The low ON-resistance of the internal N-channel switch ensures high efficiency and low power dissipation. A cycle-by-cycle current limit circuit keeps the peak current of the switch below a typical value of 1.5A. The FAN5333A/FAN5333B is available in a 5-lead SOT23 package. Applications Cell Phones PDAs Handheld Equipment Display Bias LED Bias Flash LED Typical Application BAT54 L VIN 6.8H to 10H CIN 4.7F to 10F 0.1F to 2.2F 5 SW FAN5333 VIN 4 ON OFF SHDN FB GND VOUT COUT 1 ILED ILED1 ILED2 3 R 2 R1 R2 Figure 1. Typical Application Diagram (c)2005 Fairchild Semiconductor Corporation FAN5333A/FAN5333B Rev. 1.0.1 1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch August 2005 Top View SW VIN GND FB SHDN 5-Lead SOT-23 Figure 2. Pin Assignment Pin Description Pin No. Pin Name 1 SW 2 GND 3 FB 4 SHDN 5 VIN Pin Description Switching Node. Analog and Power Ground. Feedback Pin. Feedback node that connects to an external current set resistor. Shutdown Control Pin. Logic HIGH enables, logic LOW disables the device. Input Voltage Pin. 2 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Pin Assignment Parameter Min Max Unit 6.0 V FB, SHDN to GND -0.3 VIN + 0.3 V SW to GND -0.3 VIN to GND Lead Soldering Temperature (10 seconds) Junction Temperature Storage Temperature -55 Thermal Resistance (JA) Electrostatic Discharge Protection (ESD) Level (Note 2) HBM 2 CDM 1 Min Typ 35 V 300 C 150 C 150 C 210 C/W kV Recommended Operating Conditions Parameter Max Unit Input Voltage 1.8 5.5 V Output Voltage VIN 30 V Operating Ambient Temperature -40 Output Capacitance Rated at the Required Output (Note 3) for maximum load current 0.47 25 85 C F 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. 2. Using EIA/JESD22A114B (Human Body Model) and EIA/JESD22C101-A (Charge Device Model). 3. This load capacitance value is required for the loop stability. Tolerance, temperature variation, and voltage dependency of the capacitance must be considered. Typically a 1F ceramic capacitor is required to achieve specified value at V OUT = 30V. 3 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Absolute Maximum Ratings (Note1) Unless otherwise noted, VIN = 3.6V, VOUT = 20V, ILED = 20mA, TA = -40C to 85C, Typical values are at TA = 25C, Test Circuit, Figure 3. Parameter Conditions Feedback Voltage Min. Typ. Max. Units FAN5333A 99 110 121 mV FAN5333B 299 315 331 mV 1.5 Switch Current Limit VIN = 3.2V 1.1 A Load Current Capability VOUT 20V, VIN = 3.2V 65 Switch On-resistance VIN = 5V VIN = 3.6V 0.7 Quiescent Current VSHDN = 3.6V, No Switching 0.6 mA OFF Mode Current VSHDN = 0V 0.1 Shutdown Threshold Device ON mA 0.6 1.5 V Device OFF Shutdown Pin Bias Current V 1 300 nA 1 300 nA 2.7V < VIN < 5.5V, VOUT 20V 0.3 Switching Frequency 1.2 1.5 Maximum Duty Cycle 87 93 Switch Leakage Current 0.5 VSHDN = 0V or VSHDN = 5.5V Feedback Pin Bias Current Feedback Voltage Line Regulation A 3 % 1.8 MHz 1 A % No Switching, VIN = 5.5V OVP 15 % Thermal Shutdown Temperature 150 C Test Circuit BAT54 L VIN 10H CIN COUT 1F 10F 5 SW FAN5333 VIN 4 ON OFF VOUT SHDN 1 ILED Electronic Load FB GND 3 2 R Figure 3. Test Circuit 4 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Electrical Characteristics TA = 25C, CIN = 4.7F, COUT = 0.47F, L = 10H, unless otherwise noted. Efficiency vs. Input Voltage Efficiency vs. Input Voltage 100 100 VOUT = 15V VOUT = 9V 90 Efficiency (%) Efficiency (%) 90 80 ILED = 40mA 70 ILED = 30mA 60 ILED = 10mA ILED = 40mA 70 ILED = 30mA ILED = 20mA 60 ILED = 20mA ILED = 10mA 50 50 2.0 2.5 3.0 3.5 4.0 4.5 5.0 2.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage(V) Input Voltage(V) Maximum Load Current vs. Input Voltage Maximum Load Current vs.Input Voltage 200 300 ILED<5% LED CIIN = <5% 10F CIN = 10F C OUT = 1F COUT = 1F 250 200 Maximum Load Current (mA) Maximum Load Current (mA) 80 VOUT = 15V TA = 25C 150 TA = -40C 100 TA = 85C 50 0 2 3 4 5 I LED<5% CIN = 10F COUT = 1F 150 VOUT = 12.3V 100 VOUT = 9.3V 50 VOUT = 14.2V 0 Input Voltage (V) 2.0 2.5 3.0 3.5 4.0 Input Voltage (V) LED Current vs Temperature SW Frequency vs Temperature 2.0 10.8 VIN = 5.5V VIN = 2.2V VOUT = 15V SW Frequency (MHz) LED Current (mA) 10.6 10.4 10.2 VIN = 3.6V 10.0 9.8 VOUT = 15V 1.8 VIN = 3.6V VIN = 5.5V 1.6 1.4 VIN = 2.2V 9.6 -40 -20 0 20 40 60 80 1.2 Temperature (C) -40 -20 0 20 40 60 80 Temperature (C) 5 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Typical Performance Characteristics TA = 25C, CIN = 4.7F, COUT = 0.47F, L = 10H, unless otherwise noted. Start-Up Response Load Current vs.Input Voltage 25 L = 10H CIN = 10F COUT = 1F VIN = 2.7V Output Voltage (5V/div) 15 Battery Current (0.5A/div) 10 5 0 2 3 4 Input Voltage (V) 5 EN Voltage (5V/div) Load Current (mA) VOUT = 15V 20 6 FAN5333A/FAN5333B Rev. 1.0.1 Time (100s/div) www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Typical Performance Characteristics (Contd.) VIN 5 SHDN 4 Shutdown Circuitry FB SW 1 + Over Voltage Comp 1.15 x VREF Thermal Shutdown R - FB 3 Error Amp + S + Comp - R Reference Q n Driver R S Ramp Generator Current Limit Comparator - + Oscillator + Amp - 30m 2 GND Figure 4. Block Diagram Circuit Description Over-Voltage Protection The FAN5333A/FAN5333B is a pulse-width modulated (PWM) current-mode boost converter. The FAN5333A/FAN5333B improves the performance of battery powered equipment by significantly minimizing the spectral distribution of noise at the input caused by the switching action of the regulator. In order to facilitate effective noise filtering, the switching frequency was chosen to be high, 1.5MHz. The device architecture is that of a current mode controller with an internal sense resistor connected in series with the N-channel switch. The voltage at the feedback pin tracks the output voltage at the cathode of the external Schottky diode (shown in the test circuit). The error amplifier amplifies the difference between the feedback voltage and the internal bandgap reference. The amplified error voltage serves as a reference voltage to the PWM comparator. The inverting input of the PWM comparator consists of the sum of two components: the amplified control signal received from the 30m current sense resistor and the ramp generator voltage derived from the oscillator. The oscillator sets the latch, and the latch turns on the FET switch. Under normal operating conditions, the PWM comparator resets the latch and turns off the FET, thus terminating the pulse. Since the comparator input contains information about the output voltage and the control loop is arranged to form a negative feedback loop, the value of the peak inductor current will be adjusted to maintain regulation. The voltage on the feedback pin is sensed by an OVP Comparator. When the feedback voltage is 15% higher than the nominal voltage, the OVP Comparator stops switching of the power transistor, thus preventing the output voltage from going higher. Open-circuit protection As in any current regulator, if the feedback loop is open, the output voltage increases until it is limited by some additional external circuitry. In the particular case of the FAN5333, the output voltage is limited by the switching transistor breakdown at around 45V, typically (assuming that COUT and the Schottky diode rating voltage are higher). Since at such high output voltage the output current is inherently limited by the discontinuous conduction mode, in most cases, the switching transistor enters non-destructive breakdown and the IC survives. However, to ensure 100% protection for LED disconnection, we recommend limiting VOUT with an external Zener diode or stopping the boost switching with an external voltage supervisory circuit. Applications Information Setting the Output Current Every time the latch is reset, the FET is turned off and the current flow through the switch is terminated. The latch can be reset by other events as well. Over-current condition is monitored by the current limit comparator which resets the latch and turns off the switch instantaneously within each clock cycle. The internal reference (VREF) is 110mV (Typical) for FAN5333A and 315mV (Typical) for FAN5333B. The output current is set by a resistor divider R connected between FB pin and ground. The output current is given by V FB I LED = ---------R 7 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Block Diagram Brightness Control The inductor parameters directly related to device performances are saturation current and dc resistance. The FAN5333A/ FAN5333B operates with a typical inductor value of 10H. The lower the dc resistance, the higher the efficiency. Usually a trade-off between inductor size, cost and overall efficiency is needed to make the optimum choice. 1. Dimming Using PWM Logic Signal A PWM signal applied to SHDN Table 5 on page 8 can control the LED's brightness in direct dependence with the duty cycle. The maximum frequency should not exceed 1kHz to ensure a linear dependence of the LED's average current. The amplitude of the PWM signal should be suitable to turn the FAN5333 ON and OFF. The inductor saturation current should be rated around 1A, in an application having the LED current near the maximum current as indicated in "Typical Performance Characteristics". The peak inductor current is limited to 1.5A by the current sense loop. This limit is reached only during the start-up and with heavy load condition; when this event occurs the converter can shift over in discontinuous conduction mode due to the automatic turn-off of the switching transistor, resulting in higher ripple and reduced efficiency. Alternatively, a PWM logic signal can be used to switch a FET ON/OFF to change the resistance that sets the LED's current Table 6 on page 8. Adjusting the duty cycle from 0% to 100% results in varying the LED's current between IMIN and IMAX. Where V FB V FB I MIN = ------------- and I MAX = -------------------------------R MIN R MIN R SET Some recommended inductors are suggested in the table below: Inductor Value Vendor Part Number Comment 10H TDK SLF6025&-100M1R0 10H MURATA LQH66SN100M01C Highest Efficiency 10H COOPER SD414-100 Small Size FAN5333 SHDN Figure 5. Dimming Using a PWM Signal Table 1: Recommended Inductors Capacitors Selection FAN5333 For best performance, low ESR input and output capacitors are required. Ceramic capacitors of CIN = 10F and COUT = 1F placed as close to the IC pins, are required for the maximum load(65mA). For the lighter load ( 20mA) the capacitances may be reduced to CIN = 4.7F and COUT = 0.47F or even to 0.1F, if higher ripple is acceptable. The output capacitor voltage rating should be according to the VOUT setting. Some capacitors are suggested in the table below. Capacitor Value Vendor Part Number 0.47F Panasonic ECJ-3YB1E474K 1F Murata GRM21BR61E105K 10F Murata GRM21BR61A106K FB RSET RMIN Figure 6. Dimming Using a PWM Logic Signal 2. Dimming Using DC Voltage An external adjustable DC voltage Table 7 on page 8 between 0V to 2V can control the LED's current from 15mA to 0mA, respectively. FAN5333B FAN5333A FB FB Table 2: Recommended Capacitors VDC VDC 5 Diode Selection The external diode used for rectification is usually a Schottky diode. Its average forward current and reverse voltage maximum ratings should exceed the load current and the voltage at the output of the converter respectively. A barrier Schottky diode such as BAT54 is preferred, due to its lower reverse current over the temperature range. 1.6K 90K 15 4.7K 90K Figure 7. Dimming Using DC Voltage Care should be taken to avoid any short circuit of VOUT to GND, even with the IC disabled, since the diode can be instantly damaged by the excessive current. 8 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Inductor Selection Thermal Shutdown This method allows the use of a greater than 1kHz PWM frequency signal with minimum impact on the battery ripple. The filtered PWM signal Table 8 on page 9 acts as an adjustable DC voltage as long as its frequency is significantly higher than the corner frequency of the RC low pass filter. When the die temperature exceeds 150C, a reset occurs and will remain in effect until the die cools to 130C, at that time the circuit will be allowed to restart. PCB Layout Recommendations The inherently high peak currents and switching frequency of power supplies require careful PCB layout design. Therefore, use wide traces for high current paths and place the input capacitor, the inductor, and the output capacitor as close as possible to the integrated circuit terminals. The FB pin connection should be routed away from the inductor proximity to prevent RF coupling. A PCB with at least one ground plane connected to pin 2 of the IC is recommended. This ground plane acts as an electromagnetic shield to reduce EMI and parasitic coupling between components. FAN5333A FB 20K 5 15K 1.6K 0.1F FAN5333B FB 20K 15 15K 4.7K 0.1F Figure 8. Dimming Using Filtered PWM Signal 9 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch 3. Dimming Using Filtered PWM Signal FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch Mechanical Dimensions 5-Lead SOT-23 B L c e H E e1 D A A1 Symbol Inches Millimeters Min Max Min Max A .035 .057 .90 1.45 A1 .000 .006 .00 .15 B .008 .020 .20 .50 c .003 .010 .08 .25 D .106 .122 2.70 3.10 E .059 .071 1.50 e .037 BSC e1 Notes 1.80 .95 BSC .075 BSC 1.90 BSC H .087 .126 2.20 3.20 L .004 .024 .10 .60 0 10 0 10 Ordering Information Product Number Package Type Order Code FAN5333A 5-Lead SOT23 FAN5333ASX FAN5333B 5-Lead SOT23 FAN5333BSX 10 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com 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. ACExTM FAST ActiveArrayTM FASTrTM BottomlessTM FPSTM Build it NowTM FRFETTM CoolFETTM GlobalOptoisolatorTM CROSSVOLTTM GTOTM DOMETM HiSeCTM EcoSPARKTM I2CTM E2CMOSTM i-LoTM EnSignaTM ImpliedDisconnectTM FACTTM IntelliMAXTM FACT Quiet SeriesTM Across the board. Around the world.TM The Power Franchise Programmable Active DroopTM ISOPLANARTM LittleFETTM MICROCOUPLERTM MicroFETTM MicroPakTM MICROWIRETM MSXTM MSXProTM OCXTM OCXProTM OPTOLOGIC OPTOPLANARTM PACMANTM POPTM Power247TM PowerEdgeTM PowerSaverTM PowerTrench QFET QSTM QT OptoelectronicsTM Quiet SeriesTM RapidConfigureTM RapidConnectTM SerDesTM SILENT SWITCHER SMART STARTTM SPMTM StealthTM SuperFETTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 SyncFETTM TinyLogic TINYOPTOTM TruTranslationTM UHCTM UltraFET UniFETTM VCXTM WireTM 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 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. I16 11 FAN5333A/FAN5333B Rev. 1.0.1 www.fairchildsemi.com FAN5333A/FAN5333B High Efficiency, High Current Serial LED Driver with 30V Integrated Switch TRADEMARKS ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor's product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. 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