CAT4134 500 mA Dual Channel Movie/Flash LED Driver Description The CAT4134 is a high power, dual channel boost converter which provides two matched LED currents. Output current levels are controlled by one of two resistors RSET or RFLASH. When the FLASH input pin is low (movie mode), RSET sets the current. When FLASH is high (flash mode), the resistor RFLASH sets the LED current. Each channel drives two or three white LEDs in series and provides a regulated current to control their brightness. Input supply down to 3 V is supported, making the device ideal for Li−Ion battery applications. High frequency low noise operation allows the device to be used with small external inductors and ceramic capacitors while still maintaining excellent efficiency. When not in use the device can be placed into a “zero” quiescent mode via the shutdown pin. In addition to soft-start control and current limiting, the CAT4134 include thermal shutdown protection. A dedicated overvoltage pin (OVP) allows the user to limit the maximum LED supply voltage. The device is packaged in the 12−pad TDFN 3 mm x 3 mm. Features • • • • • • • • • • • • Dual Mode (Movie or Flash) Operation Independent Movie/Flash LED Current Control Can Drive 2, 3, 4 or 6 LEDs High LED Current (250 mA Max per Channel) Power Efficiency up to 85% Dual Frequency Mode 1.2 MHz and 900 kHz Soft−start Inrush Current Adjustable Overvoltage Protection Thermal Shutdown Protection Operating Temperature Range −40°C to +85°C 12−pad TDFN 3 mm x 3 mm Package These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Applications • • • • • Camera Flash Flash Light High−power White LEDs Digital Still Cameras Color LCD Backlighting © Semiconductor Components Industries, LLC, 2010 February, 2010 − Rev. 2 http://onsemi.com TDFN−12 HV2 SUFFIX CASE 511AN PIN CONNECTIONS 1 FLASH EN OVP SW TAB is GND PGND AGND SW VIN LED2 RSET LED1 RFLASH (Top View) MARKING DIAGRAM HAAS HAAU HAAS = CAT4134HV2−T2 HAAU = CAT4134HV2−GT2 ORDERING INFORMATION Device Package Shipping CAT4134HV2−T2 (Note 1) TDFN−12 (Pb−Free) 2,000/ Tape & Reel CAT4134HV2−GT2 (Note 2) TDFN−12 (Pb−Free) 2,000/ Tape & Reel 1. Matte−Tin Plated Finish (RoHS−compliant). 2. NiPdAu Plated Finish (RoHS−compliant) 1 Publication Order Number: CAT4134/D CAT4134 D L VIN 3 V to 4.2 V 22 mH C1 VOUT C2 10 mF 10 mF SW VIN R1 1 MW EN CAT4134 FLASH LED1 RFLASH LED2 RSET OVP OFF ON RFLASH 18 kW RSET 20 kW AGND PGND L = Sumida CDRH3D16−220 D = Central CMDSH05−4 (500 mA) C2 = 10 mF (rated 16 V) R2 100 kW Figure 1. Typical Application Circuit Table 1. ABSOLUTE MAXIMUM RATINGS Parameters Ratings Units SW voltage 20 V VIN voltage 8 V VIN + 0.6 V V 8 V Output Current per Channel 300 mA Storage Temperature Range −65 to +160 _C Junction Temperature Range −40 to +125 _C 300 _C 2,000 V EN, FLASH, RSET, RFLASH voltage LED1, LED2 voltage Lead Temperature ESD Rating − Human Body Model (HBM) Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Table 2. RECOMMENDED OPERATING CONDITIONS Parameters Range Units VIN 2.8 to 4.2 V Ambient Temperature Range −40 to +85 _C Flash mode current per channel 25 to 250 mA Movie mode current per channel 5 to 50 mA http://onsemi.com 2 CAT4134 Table 3. ELECTRICAL OPERATING CHARACTERISTICS (VIN = 3.6 V, EN = VIN and at ambient temperature of 25°C (over recommended operating conditions unless otherwise specified)) Symbol Parameter Conditions IQ Quiescent Current (not switching) VLED1 > 0.5 V, VLED2 > 0.5 V ISD Shutdown Current EN = 0 V ISW Switch Current Limit Movie Mode (FLASH = Low) Flash Mode (FLASH = High) RSW Switch Resistance ISW = 1000 mA Switch Leakage Current Switch Off, VSW = 5 V FOSC Oscillator Frequency Movie Mode Flash Mode VOVP OVP pin threshold ILK 0.5 1.7 Typ Max Unit 100 250 mA 1 mA 1 2 A 0.3 0.5 W 5 mA 1.2 0.9 1.10 VOUT = 10 V, Load = 200 mA 1.20 MHz 1.30 V 85 % TSD Thermal Shutdown 150 °C THYST Thermal Hysteresis 20 °C VUVLO Undervoltage Lock Out (UVLO) Threshold h Efficiency Min Disabled when VIN < VUVLO 1.9 2.2 V 0.7 0.7 1.5 V 10 40 mA EN LOGIC CONTROL INPUT VSDHI VSDLO Logic High Threshold Logic Low Threshold EN > VSDHI Enables Device ISDBIAS Input Bias current EN = 3 V VRSET RSET pin voltage 22 kW < RSET < 200 kW 1.10 1.20 1.30 V RFLASH pin voltage 22 kW < RFLASH < 200 kW 1.10 1.20 1.30 V VLED LED1, LED2 Pin Voltage (whichever is the lower) Both Flash and Movie Mode (lower voltage pin is regulated) 400 mV ILED Programmed LED Current RSET = 21.6 kW RFLASH = 43.2 kW RFLASH = 21.6 kW 20 50 100 mA ILED-RAN LED Current Adjust Range per LED output In Movie mode In Flash mode ILED-ACC LED Current Accuracy ±5 % ILED-DEV LED Current Matching ±5 % VRFLASH 0.4 5 25 50 200 mA FLASH CONTROL LOGIC INPUT VFHI VFLO Logic High Threshold Logic Low Threshold FLASH > VFHI Flash Enabled IINPUT Input Bias current FLASH = 3 V 0.4 http://onsemi.com 3 0.7 0.7 1.5 V 10 40 mA CAT4134 TYPICAL CHARACTERISTICS 2.0 2.0 1.5 1.5 LED CURRENT CHANGE (%) LED CURRENT CHANGE (%) (VIN = 3.6 V, FLASH = VIN, CIN = 4.7 mF, COUT = 10 mF, L = 22 mH with 2 LEDs at 100 mA, TAMB = 25°C, unless otherwise specified.) 1.0 0.5 1 LED 0 2 LEDs −0.5 −1.0 −1.5 −2.0 2.5 3.0 3.5 4.0 0 −1.0 −1.5 2.5 3.0 3.5 4.0 INPUT VOLTAGE (V) Figure 2. LED Current Regulation (100 mA Load) Figure 3. LED Current Regulation (200 mA Load, Flash) 4.5 2.0 LED CURRENT CHANGE (%) 2 LEDs VIN = 3.6 V 1850 1800 1750 1700 1650 0 50 100 150 1.5 0.5 0 −0.5 −1.0 −1.5 −2.0 200 2.5 3.0 3.5 4.0 Rflash (kW) INPUT VOLTAGE (V) Figure 4. Current Gain vs. RFLASH Figure 5. LED Current Regulation (100 mA Load, Flash) 90 80 80 70 2 LEDs VIN = 3.6 V 60 2 LEDs at 100 mA 1.0 90 4.5 70 60 2 LEDs at 100 mA 50 50 40 2 LEDs −0.5 INPUT VOLTAGE (V) EFFICIENCY (%) CURRENT GAIN (Iout / Iflash) EFFICIENCY (%) 0.5 −2.0 4.5 1900 1600 1.0 0 50 100 150 200 40 250 2.5 3.0 3.5 4.0 4.5 TOTAL LED CURRENT (mA) INPUT VOLTAGE (V) Figure 6. Efficiency vs. Output Current (Flash Mode) Figure 7. Efficiency vs. Input Voltage (Flash Mode) http://onsemi.com 4 5.0 CAT4134 TYPICAL CHARACTERISTICS (VIN = 3.6 V, FLASH = VIN, CIN = 4.7 mF, COUT = 10 mF, L = 22 mH with 2 LEDs at 100 mA, TAMB = 25°C, unless otherwise specified.) Figure 8. Power−up Transient (2 LEDs at 200 mA) Figure 9. Power−up Transient (2 LEDs at 200 mA) Figure 10. Power−up Transient (2 LEDs at 200 mA) Figure 11. Power−up Transient (2 LEDs at 200 mA) Figure 12. Switching Waveform in Flash Mode (2 LEDs) http://onsemi.com 5 CAT4134 TYPICAL CHARACTERISTICS (VIN = 3.6 V, CIN = 4.7 mF, COUT = 10 mF, L = 22 mH with 2 LEDs at 100 mA, TAMB = 25°C, unless otherwise specified.) CLOCK FREQUENCY (kHz) 1300 Movie Mode 20 mA per LED 1200 1100 1000 Flash Mode 50 mA per LED 900 800 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE (V) Figure 13. Switching Frequency vs. Supply Voltage Figure 14. Enable Flash Waveform http://onsemi.com 6 CAT4134 Table 4. PIN DESCRIPTION Pin # Name Function 1 FLASH 2 EN 3 PGND Power ground reference. 4 AGND Analog ground reference. 5 LED2 LED channel 2, connected to the LED cathode.* 6 LED1 LED channel 1, connected to the LED cathode.* 7 RFLASH Resistor connection to set Flash mode LED current. 8 RSET Resistor connection to set Movie mode LED current. 9 VIN Power supply input. 10, 11 SW Drain connection of low resistance power MOSFET. 12 OVP Over Voltage Protection comparator input Logic input, set high to select the flash mode. Enable control logic input (Active High). *LED1 or LED2 pin should not be left floating. Pin Function VIN is the supply voltage input. The device is compatible with supply voltages down to 2.8 V and up to 4.2 V. Internal under-voltage lockout (UVLO) circuitry will automatically prevent the device from operating whenever the supply falls below 1.9 V. For operation up to maximum rated loads a bypass ceramic capacitor of 10 mF is recommended between the VIN and GND pins near the device. EN is the enable logic input (active high). When the pin voltage is taken below 0.4 V, the device enters shutdown mode, drawing nearly zero current. At pin voltages greater than 1.4 V, the device is fully enabled. FLASH is the logic input (active high) used to control Flash mode operation. When the pin voltage is taken above 1.4 V, the device transitions from Movie mode to Flash mode. When the pin voltage is taken back below 0.4 V, the device returns back to Movie mode operation. RSET, RFLASH pins allow to set the LED current respectively in Movie and Flash mode. These pins, regulated at 1.2 V, must be connected to a pull-down resistor tied to ground. The LED current is a function of the resistor value. GND is the ground reference for the driver. The pin must be connected to the ground plane on the PCB. SW pin is the drain terminal of the internal low resistance power switch. The inductor and the Schottky diode anode should be connected to the SW pin. Traces going to the SW pin should be as short as possible with minimum loop area. This pin contains over-voltage circuitry which becomes active above 18 V. In the event of an “open-LED” fault condition, the device will enter a low power mode and the SW pin will be clamped to approximately 21 V. LED1, LED2 provide the internal regulated current for each of the LED cathodes. These pins enter a high impedance zero current state whenever the device is placed in shutdown mode. In applications with only one string of LEDs, the two LED pins should be tied together. LED pins should not be left floating. OVP is the overvoltage protection input pin. When the pin voltage exceeds the 1.2 V overvoltage threshold (VOVP), the driver stops switching. The output VOUT then drops down. As soon as the OVP pin voltage falls under the VOVP threshold, the part starts switching again. TAB is the exposed pad underneath the package. For best thermal performance, the tab should be soldered to the PCB and connected to the ground plane. http://onsemi.com 7 CAT4134 Device Operation The device is powered from the input pin VIN. A switching frequency of 1.2 MHz is used in Movie mode, when the FLASH input is low. Continuous LED current up to 50 mA is controlled by the RSET resistor. For higher load current, the Flash mode is selected by setting the FLASH input pin high. RFLASH now controls the LED current. In flash mode, the driver efficiency is kept high even under high load current by using a lower switching frequency of 900 kHz. In movie mode, the higher frequency of 1.2 MHz provides a lower noise operation. maximum operating voltage on the output VOUT using external resistors R1 and R2. The resistor ratio sets the maximum output voltage as shown in the equation below: ǒ Ǔ R1 + VOUT MAX * 1.2 1.2 R2 VOUTMAX should always be higher than the total LED forward voltage (SVf) plus 1.2 V. Also VOUT must be less than SVf + 8 V. SVf ) 1.2 V t VOUT MAX t SVf ) 8 V t 16 V Overvoltage Protection (OVP) If the overvoltage protection is not needed, then the OVP pin should be connected to Ground. In that case, the maximum voltage on the SW pin is set to 17 V. To prevent the SW pin voltage from exceeding the internal switch maximum voltage rating, an overvoltage protection (OVP) function is supported. The OVP pin allows to set the Block Diagram VOUT VIN CIN COUT SW VIN Dual Frequency PWM Controller EN PGND LED1 FLASH LED2 OVP RFLASH RSET RFLASH R1 mux Current Setting 2 Current Sink Regulators RSET AGND Figure 15. Block Diagram http://onsemi.com 8 R2 CAT4134 Application Information Movie Mode When the EN input is high and FLASH is low, the driver is in movie mode. In this mode, the LED1 and LED2 pin currents are set by the resistor RSET and are regulated to 360 times the current in the RSET resistor and follows the equation: The typical application for the CAT4134 is in a camera−equipped cellular phone where the LEDs are used for illumination in flash mode with short duration high−current pulse and in movie mode with continuous lighter load. In movie mode, the FLASH pin is set low. NOTE: Hot-plugging the LEDs while the output is fully charged is not recommended. If the LEDs are disconnected, the device should first be powered-down and the output discharged before reconnecting the LEDs to the output and the LED pins. LED current + 360 1.2 V RSET Table 5 lists the various LED currents and the associated resistor values in movie and flash modes. Table 5. RESISTOR SELECTION IN MOVIE AND FLASH MODE EN LED1, LED2 Current Flash Mode Movie Mode FLASH LED Current (mA) movie mode flash mode movie mode Figure 16. Timing Diagram RSET (kW) LED Current (mA) RFLASH (kW) 5 86.4 50 43.2 10 43.2 75 28.8 20 21.6 100 21.6 30 14.4 150 14.4 LED Current Setting Shutdown Mode Flash Mode When the EN input is low, the driver is in shutdown mode and there is no current flowing in either LED1 or LED2 pins. The enable EN and FLASH logic input signals control the LED current. When both the EN and FLASH inputs are high, the driver is in flash or strobe mode. In this mode, the LED1 and LED2 pin currents are set by the resistor RFLASH and are regulated to 1800 times the current in the RFLASH resistor and follows the equation: LED current + 1800 1.2 V RFLASH http://onsemi.com 9 CAT4134 Typical Applications The CAT4134 can drive one or two strings of 2 to 3 LEDs in series resulting in combinations of 2, 3, 4, 6 LEDs. The resistor ratio R1/R2 sets the maximum VOUT during an open-LED fault condition and provides the overvoltage protection. For applications with 2 LEDs in series and VOUTMAX at 10 V, the ratio R1/R2 is 7. For applications with 3 LEDs in series and VOUTMAX at 13.5 V, the ratio R1/R2 is 10. Figure 17. 2 LED Application Figure 18. 3 LED Application Figure 19. 4 LED Application Figure 20. 6 LED Application http://onsemi.com 10 CAT4134 PACKAGE DIMENSIONS TDFN12, 3x3 CASE 511AN−01 ISSUE A D A e b L E E2 PIN#1 ID PIN#1 INDEX AREA A1 TOP VIEW MIN NOM MAX A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A3 0.178 0.203 0.228 b 0.18 0.23 0.30 D 2.90 3.00 3.10 D2 2.30 2.40 2.50 E 2.90 3.00 3.10 E2 1.55 1.70 1.75 A A3 A1 FRONT VIEW RECOMMENDED LAND PATTERN R e M 0.45 BSC L 0.30 0.40 0.50 M 0.25 0.30 0.35 N 0.60 0.70 0.80 P 2.70 3.00 3.10 R BOTTOM VIEW SIDE VIEW SYMBOL e D2 N P 2.25 TYP E2 Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-229. D2 http://onsemi.com 11 CAT4134 Example of Ordering Information (Note 5) 3. 4. 5. 6. 7. Prefix Device # Suffix CAT 4134 HV2 −G T2 Company ID (Optional) Product Number 4134 Package HV2: TDFN Lead Finish Blank: Matte−Tin G: NiPdAu Tape & Reel (Note 7) T: Tape & Reel 2: 2,000 / Reel All packages are RoHS−compliant (Lead−free, Halogen−free). The standard lead finish is NiPdAu. The device used in the above example is a CAT4134HV2−GT2 (TDFN, NiPdAu, Tape & Reel, 2,000/Reel). For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC 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. “Typical” parameters which may be provided in SCILLC 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. SCILLC does not convey any license under its patent rights nor the rights of others. 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This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada Email: [email protected] N. American Technical Support: 800−282−9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81−3−5773−3850 http://onsemi.com 12 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative CAT4134/D