CAT4134

CAT4134 500mA Dual Channel Movie/Flash LED Driver FEATURES 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 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 3V 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 3mm X 3mm. APPLICATIONS Camera flash Flash light High-power white LEDs Digital still cameras Color LCD backlighting ORDERING INFORMATION Part Number CAT4134HV2 * Matte-Tin Finish Package Thin DFN-12 Lead Free* Quantity Package per Reel Marking 2000 HAAS TYPICAL APPLICATION CIRCUIT VIN 3V to 4.2V C1 10µF VIN EN OFF ON L 22µH D C2 SW 10µF R1 VOUT For Ordering Information details, see page 12. CAT4134 LED1 LED2 OVP 1MΩ PIN CONFIGURATION Top View RFLASH FLASH RFLASH RSET RSET 20kΩ AGND FLASH EN PGND AGND LED2 LED1 1 2 3 4 5 6 TAB is GND 12 OVP 11 SW 10 SW 9 8 7 VIN RSET RFLASH 18kΩ R2 PGND 100kΩ L = Sumida CDRH3D16-220 D = Central CMDSH05-4 (500mA) C2 = 10µF (rated 16V) 12-Pad TDFN 3mm x 3mm © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 1 Doc. No. 5021 Rev. A 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) 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) ISD ISW RSW ILK FOSC VOVP η TSD THYST VUVLO Shutdown Current Switch Current Limit Switch Resistance Switch Leakage Current Oscillator Frequency OVP pin threshold Efficiency Thermal Shutdown Thermal Hysteresis Undervoltage Lock Out (UVLO) Threshold Disabled when VIN < VUVLO VOUT = 10V, Load = 200mA Conditions VLED1 > 0.5V, VLED2 > 0.5V EN = 0V Movie Mode (FLASH = Low) Flash Mode (FLASH = High) ISW = 1000mA Switch Off, VSW = 5V Movie Mode Flash Mode 1.10 Min Typ 100 1 1 2 0.3 1.2 0.9 1.20 85 150 20 1.9 2.2 1.30 0.5 5 Max 250 Unit µA µA A Ω µA MHz V % ºC ºC V Range 2.8 to 4.2 -40 to +85 25 to 250 5 to 50 Units V °C mA mA 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 0.5 1.7 EN LOGIC CONTROL INPUT VSDHI VSDLO ISDBIAS Logic High Threshold Logic Low Threshold Input Bias current EN > VSDHI Enables Device EN = 3V 0.4 0.7 0.7 10 1.5 40 V µA © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 2 Doc. No. 5021 Rev. A 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 VRFLASH VLED RFLASH pin voltage LED1, LED2 Pin Voltage (whichever is the lower) Programmed LED Current LED Current Adjust Range per LED output LED Current Accuracy LED Current Matching Conditions 22kΩ < RSET < 200kΩ 22kΩ < RFLASH < 200kΩ 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 Min 1.10 1.10 Typ 1.20 1.20 400 20 50 100 5 25 ±5 ±5 50 200 Max 1.30 1.30 Unit V V mV ILED ILED-RAN ILED-ACC ILED-DEV mA mA % % FLASH CONTROL LOGIC INPUT Logic High Threshold VFHI Logic Low Threshold VFLO IINPUT Input Bias current FLASH > VFHI Flash Enabled FLASH = 3V 0.4 0.7 0.7 10 1.5 40 V µA © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 3 Doc. No. 5021 Rev. A 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 (100mA load) 2.0 LED CURRENT CHANGE [%] LED CURRENT CHANGE [%] LED Current Regulation (200mA load, Flash) 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE [V] 2 LEDs 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE [V] 2 LEDs 1 LED Current Gain vs. RFLASH CURRENT GAIN (Iout / Iflash) . 1900 LED Current Regulation (100mA load, Flash) 2.0 LED CURRENT CHANGE [%] 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE [V] 1850 1800 1750 1700 1650 1600 0 2 LEDs VIN= 3.6V 2 LEDs at 100mA 50 100 150 Rflash [kohm] 200 Efficiency vs. Output Current (Flash mode) 90 EFFICIENCY (%) . Efficiency vs. Input Voltage (Flash mode) 90 EFFICIENCY (%) . 80 70 60 2 LEDs at 100mA 50 40 80 70 60 50 40 0 50 100 150 200 250 TOTAL LED CURRENT [mA] VIN = 3.6V 2 LEDs 2.5 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE [V] Doc. No. 5021 Rev. A 4 © 2006 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) © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 5 Doc. No. 5021 Rev. A CAT4134 TYPICAL CHARACTERISTICS VIN = 3.6V, CIN = 4.7µF, COUT = 10µF, L = 22µH with 2 LEDs at 100mA, TAMB = 25ºC, unless otherwise specified. Switching Frequency vs. Supply Voltage 1300 CLOCK FREQUENCY [kHz] 1200 1100 1000 900 800 2.5 3.0 3.5 4.0 4.5 INPUT VOLTAGE [V] Enable Flash waveform Movie mode 20mA per LED Flash mode 50mA per LED Doc. No. 5021 Rev. A 6 © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. CAT4134 PIN DESCRIPTION Pin # 1 2 3 4 5 6 7 8 9 10,11 12 Name FLASH EN PGND AGND LED2 LED1 RFLASH RSET VIN SW OVP Function Logic input, set high to select the flash mode. Enable control logic input (Active High). Power ground reference. Analog ground reference. LED channel 2, connected to the LED cathode.* LED channel 1, connected to the LED cathode.* Resistor connection to set Flash mode LED current. Resistor connection to set Movie mode LED current. Power supply input. Drain connection of low resistance power MOSFET. Over Voltage Protection comparator input * 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. 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. 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. 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. 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 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. 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 1.2V 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. 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. © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 7 Doc. No. 5021 Rev. A 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. 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 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. BLOCK DIAGRAM VIN CIN COUT VOUT SW VIN EN Dual Frecuency PWM Controller PGND LED1 FLASH RFLASH Current Setting LED2 OVP R1 RSET RFLASH RSET mux 2 Current Sink Regulators R2 AGND Doc. No. 5021 Rev. A 8 © 2006 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 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 x 1.2V / RFLASH 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: LED current = 360 x 1.2V / RSET Table 1 lists the various LED currents and the associated resistor values in movie and flash modes. Table 1. Resistor Selection in Movie and Flash Mode Movie Mode LED Current RSET (mA) (kΩ) 5 86.4 10 43.2 20 21.6 30 14.4 Shutdown 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. Flash Mode LED Current RFLASH (mA) (kΩ) 50 43.2 75 28.8 100 21.6 150 14.4 © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 9 Doc. No. 5021 Rev. A 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 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. 2 LED Application 3 LED Application 4 LED Application 6 LED Application Doc. No. 5021 Rev. A 10 © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. CAT4134 PACKAGE INFORMATION Thin DFN 12-Pad 3mm x 3mm, 0.45mm Pitch TDFN 12-Lead 3 x 3mm, 0.45mm Pitch PIN 1 INDENT C PIN 1 ID L e D E2 b 5xe E A1 A D2 LAND PATTERN 0.95 SYMBOL A A1 b C D D2 E E2 e L MIN 0.70 0.00 0.18 2.90 1.60 2.90 2.30 0.35 NOM 0.75 0.02 0.23 0.20 REF 3.00 1.70 3.00 2.40 0.45 0.45 MAX 0.80 0.05 0.30 3.10 1.80 3.10 2.50 0.55 0.45 2.40 0.23 1.70 3.00 4.00 Legend: Package Land Pattern Notes: 1. All dimensions in millimeters. Angles in degrees. 2. Coplanarity shall not exceed 0.08mm. 3. Warpage shall not exceed 0.10mm. 4. Package length / package width are considered as special characteristic. 5. Refer JEDEC MO-229. For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. 11 Doc. No. 5021 Rev. A CAT4134 ORDERING INFORMATION Prefix CAT Device # Suffix 4134 Product Number 4134 HV2 – T2 Optional Company ID Package HV2: TDFN Tape & Reel T: Tape & Reel 2: 2000 units / Reel Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard finish is Matte-Tin. (3) The device used in the above example is a CAT4134HV2-T2 (TDFN, Tape and Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. Doc. No. 5021 Rev. A 12 © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice. REVISION HISTORY Date 10/18/06 Rev. A Reason Initial Issue Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Beyond Memory™, DPP™, EZDim™, MiniPot™, and Quad-Mode™ Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. 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: 5021 Revision: A Issue date: 10/18/06