CAT4134 500mA Dual Channel Movie/Flash LED Driver DESCRIPTION FEATURES 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 3V is supported, making the device ideal for Li-Ion battery applications. Dual Mode (Movie or Flash) operation Independent Movie/Flash LED current control Can drive 2, 3, 4 or 6 LEDs High LED Current (250mA max per channel) Power efficiency up to 85% Dual frequency mode 1.2MHz and 900kHz Soft-start inrush current Adjustable overvoltage protection Thermal shutdown protection Operating temperature range -40ºC to +85ºC 12-pad TDFN 3mm x 3mm package 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. APPLICATIONS Camera flash Flash light High-power white LEDs Digital still cameras Color LCD backlighting 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 3mm x 3mm. ORDERING INFORMATION Quantity Package Part Number Package per Reel Marking CAT4134HV2-T2 TDFN-12 (1) 2,000 HAAS (2) CAT4134HV2-GT2 TDFN-12 2,000 HAAU For Ordering Information details, see page 12. Notes: (1) Matte-Tin Plated Finish (RoHS-compliant). (2) NiPdAu Plated Finish (RoHS-compliant). TYPICAL APPLICATION CIRCUIT PIN CONFIGURATION 12-Pad TDFN 3mm x 3mm Top View FLASH EN 1 2 PGND 3 AGND 4 LED2 5 LED1 12 OVP 6 22µH C1 3V to 4.2V 10µF 11 SW TAB is GND VIN 8 RSET 7 EN OFF ON RFLASH R1 1MΩ FLASH LED1 RFLASH LED2 OVP RSET 18kΩ 20kΩ Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 10µF CAT4134 RSET RFLASH VOUT C2 SW VIN 10 SW 9 D L VIN 1 R2 AGND PGND L = Sumida CDRH3D16-220 D = Central CMDSH05-4 (500mA) C2 = 10µF (rated 16V) 100kΩ Doc. No. MD-5021 Rev. B CAT4134 ABSOLUTE MAXIMUM RATINGS Parameters SW voltage VIN voltage EN, FLASH, RSET, RFLASH voltage LED1, LED2 voltage Output Current per Channel Storage Temperature Range Junction Temperature Range Lead Temperature ESD Rating – Human Body Model (HBM) Ratings 20 8 VIN + 0.6V 8 300 -65 to +160 -40 to +125 300 2000 Units V V V V mA °C °C °C V Range 2.8 to 4.2 -40 to +85 25 to 250 5 to 50 Units V °C mA mA RECOMMENDED OPERATING CONDITIONS Parameter VIN Ambient Temperature Range Flash mode current per channel Movie mode current per channel ELECTRICAL OPERATING CHARACTERISTICS Over recommended operating conditions unless specified otherwise. VIN = 3.6V, EN = VIN and at ambient temperature of 25ºC. Symbol Parameter IQ Quiescent Current (not switching) Conditions VLED1 > 0.5V, VLED2 > 0.5V ISD Shutdown Current EN = 0V ISW Switch Current Limit Movie Mode (FLASH = Low) Flash Mode (FLASH = High) RSW Switch Resistance ISW = 1000mA Switch Leakage Current Switch Off, VSW = 5V FOSC Oscillator Frequency Movie Mode Flash Mode VOVP OVP pin threshold ILK η Efficiency Min 0.5 1.7 Typ 100 Max 250 1 µA 1 2 A 0.3 0.5 Ω 5 µA 1.2 0.9 1.10 VOUT = 10V, Load = 200mA Unit µA 1.20 MHz 1.30 V 85 % TSD Thermal Shutdown 150 ºC THYST Thermal Hysteresis 20 ºC VUVLO Undervoltage Lock Out (UVLO) Threshold Disabled when VIN < VUVLO 1.9 2.2 V 0.7 0.7 1.5 V 10 40 µA EN LOGIC CONTROL INPUT VSDHI VSDLO Logic High Threshold Logic Low Threshold EN > VSDHI Enables Device ISDBIAS Input Bias current EN = 3V Doc. No. MD-5021 Rev. B 2 0.4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. CAT4134 ELECTRICAL OPERATING CHARACTERISTICS (continued) Over recommended operating conditions unless specified otherwise. VIN = 3.6V, EN = VIN and at ambient temperature of 25ºC. Symbol Parameter VRSET RSET pin voltage Conditions 22kΩ < RSET < 200kΩ Min 1.10 Typ 1.20 Max 1.30 Unit V VRFLASH RFLASH pin voltage 22kΩ < RFLASH < 200kΩ 1.10 1.20 1.30 V LED1, LED2 Pin Voltage (whichever is the lower) Both Flash and Movie Mode (lower voltage pin is regulated) RSET = 21.6kΩ RFLASH = 43.2kΩ RFLASH = 21.6kΩ In Movie mode In Flash mode VLED 400 mV 20 50 100 mA ILED Programmed LED Current ILED-RAN LED Current Adjust Range per LED output ILED-ACC LED Current Accuracy ±5 % ILED-DEV LED Current Matching ±5 % 5 25 50 200 mA FLASH CONTROL LOGIC INPUT VFHI VFLO Logic High Threshold Logic Low Threshold IINPUT Input Bias current © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. FLASH > VFHI Flash Enabled FLASH = 3V 3 0.4 0.7 0.7 1.5 V 10 40 µA Doc. No. MD-5021 Rev. B CAT4134 TYPICAL CHARACTERISTICS VIN = 3.6V, FLASH = VIN, CIN = 4.7µF, COUT = 10µF, L = 22µH with 2 LEDs at 100mA, TAMB = 25ºC, unless otherwise specified. LED Current Regulation (200mA load, Flash) LED Current Regulation (100mA load) 2.0 LED CURRENT CHANGE [%] LED CURRENT CHANGE [%] 2.0 1.5 1.0 1 LED 0.5 0.0 2 LEDs -0.5 -1.0 -1.5 -2.0 2.5 3.0 3.5 4.0 1.5 1.0 0.5 0.0 2 LEDs -0.5 -1.0 -1.5 -2.0 2.5 4.5 Current Gain vs. RFLASH 4.0 4.5 LED Current Regulation (100mA load, Flash) 2.0 1900 LED CURRENT CHANGE [%] CURRENT GAIN (Iout / Iflash) . 3.5 INPUT VOLTAGE [V] INPUT VOLTAGE [V] 2 LEDs VIN= 3.6V 1850 1800 1750 1700 1650 1600 0 50 100 150 Rflash [kohm] 1.5 0.5 0.0 -0.5 -1.0 -1.5 -2.0 2.5 3.5 4.0 4.5 Efficiency vs. Input Voltage (Flash mode) 80 80 EFFICIENCY (%) . 90 70 VIN = 3.6V 2 LEDs 50 3.0 INPUT VOLTAGE [V] 90 60 2 LEDs at 100mA 1.0 200 Efficiency vs. Output Current (Flash mode) EFFICIENCY (%) . 3.0 70 60 2 LEDs at 100mA 50 40 40 0 50 100 150 200 2.5 250 Doc. No. MD-5021 Rev. B 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE [V] TOTAL LED CURRENT [mA] 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. CAT4134 TYPICAL CHARACTERISTICS VIN = 3.6V, FLASH = VIN, CIN = 4.7µF, COUT = 10µF, L = 22µH with 2 LEDs at 100mA, TAMB = 25ºC, unless otherwise specified. Power-up Transient (2 LEDs at 200mA) Power-up Transient (2 LEDs at 200mA) Power-up Transient (2 LEDs at 200mA) Power-up Transient (2 LEDs at 200mA) Switching Waveform in Flash mode (2 LEDs) © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 5 Doc. No. MD-5021 Rev. B CAT4134 TYPICAL CHARACTERISTICS VIN = 3.6V, CIN = 4.7µF, COUT = 10µF, L = 22µH with 2 LEDs at 100mA, TAMB = 25ºC, unless otherwise specified. Enable Flash waveform Switching Frequency vs. Supply Voltage CLOCK FREQUENCY [kHz] 1300 1200 Movie mode 20mA per LED 1100 1000 Flash mode 50mA per LED 900 800 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE [V] Doc. No. MD-5021 Rev. B 6 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. CAT4134 PIN DESCRIPTION Pin # Name Function 1 FLASH Logic input, set high to select the flash mode. 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 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 2.8V and up to 4.2V. Internal under-voltage lockout (UVLO) circuitry will automatically prevent the device from operating whenever the supply falls below 1.9V. For operation up to maximum rated loads a bypass ceramic capacitor of 10µF is recommended between the VIN and GND pins near the device. 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 18V. 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 21V. EN is the enable logic input (active high). When the pin voltage is taken below 0.4V, the device enters shutdown mode, drawing nearly zero current. At pin voltages greater than 1.4V, the device is fully enabled. 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. FLASH is the logic input (active high) used to control Flash mode operation. When the pin voltage is taken above 1.4V, the device transitions from Movie mode to Flash mode. When the pin voltage is taken back below 0.4V, the device returns back to Movie mode operation. OVP is the overvoltage protection input pin. When the pin voltage exceeds the 1.2V 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. RSET, RFLASH pins allow to set the LED current respectively in Movie and Flash mode. These pins, regulated at 1.2V, must be connected to a pull-down resistor tied to ground. The LED current is a function of the resistor value. 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. GND is the ground reference for the driver. The pin must be connected to the ground plane on the PCB. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 7 Doc. No. MD-5021 Rev. B CAT4134 DEVICE OPERATION The device is powered from the input pin VIN. A switching frequency of 1.2MHz is used in Movie mode, when the FLASH input is low. Continuous LED current up to 50mA 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 900kHz. In movie mode, the higher frequency of 1.2MHz provides a lower noise operation. resistor ratio sets the maximum output voltage as shown in the equation below: R1/R2 = (VOUTMAX /1.2) - 1.2 VOUTMAX should always be higher than the total LED forward voltage (ΣVf) plus 1.2V. Also VOUT must be less than ΣVf + 8V. ΣVf + 1.2V < VOUTMAX < ΣVf + 8V < 16V 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 17V. Overvoltage Protection (OVP) 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 maximum operating voltage on the output VOUT using external resistors R1 and R2. The BLOCK DIAGRAM VIN VOUT CIN COUT SW VIN Dual Frecuency PWM Controller EN PGND LED1 FLASH OVP RFLASH RSET R1 LED2 mux Current Setting 2 Current Sink Regulators R2 RFLASH RSET Doc. No. MD-5021 Rev. B AGND 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. CAT4134 APPLICATION INFORMATION 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. TIMING DIAGRAM EN FLASH LED1, LED2 Current movie mode flash mode movie mode LED CURRENT SETTING Flash Mode Table 1. Resistor Selection in Movie and Flash Mode 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: Movie Mode LED Current RSET (mA) (kΩ) 5 86.4 10 43.2 20 21.6 30 14.4 LED current = 1800 x 1.2V / RFLASH Flash Mode LED Current RFLASH (mA) (kΩ) 50 43.2 75 28.8 100 21.6 150 14.4 Movie Mode Shutdown 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: When the EN input is low, the driver is in shutdown mode and there is no current flowing in either LED1 or LED2 pins. LED current = 360 x 1.2V / RSET Table 1 lists the various LED currents and the associated resistor values in movie and flash modes. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 9 Doc. No. MD-5021 Rev. B 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. For applications with 2 LEDs in series and VOUTMAX at 10V, the ratio R1/R2 is 7. For applications with 3 LEDs in series and VOUTMAX at 13.5V, the ratio R1/R2 is 10. The resistor ratio R1/R2 sets the maximum VOUT during an open-LED fault condition and provides the overvoltage protection. 2 LED Application 3 LED Application 4 LED Application Doc. No. MD-5021 Rev. B 6 LED Application 10 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. CAT4134 PACKAGE OUTLINE DRAWINGS TDFN 12-Pad 3mm x 3mm, (HV2) (1) (2) D A e b L E E2 PIN#1 ID PIN#1 INDEX AREA A1 TOP VIEW D2 SIDE VIEW BOTTOM VIEW A A3 SYMBOL 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 e FRONT VIEW RECOMMENDED LAND PATTERN R e M N 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 A1 P E2 2.25 TYP D2 For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC standard MO-229 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 11 Doc. No. MD-5021 Rev. B CAT4134 EXAMPLE OF ORDERING INFORMATION (1) Prefix Device # Suffix CAT 4134 HV2 Product Number Optional Company ID – G T2 Lead Finish Blank: Matte-Tin G: NiPdAu Tape & Reel T: Tape & Reel 2: 2,000/Reel Package HV2: TDFN For Product Top Mark Codes, click here: http://www.catsemi.com/techsupport/producttopmark.asp Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is NiPdAu. (3) The device used in the above example is a CAT4134HV2-GT2 (TDFN, NiPdAu, Tape and Reel, 2,000/Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. Doc. No. MD-5021 Rev. B 12 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice. REVISION HISTORY Date 18-Oct-06 13-May-08 Rev. A B Reason Initial Issue Add TDFN in NiPdAu plated finish. Update Package Outline Drawing. Update Example of Ordering Information. Add MD- to the document number. 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Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com Document No: MD-5021 Revision: B Issue date: 05/13/08