CAT3604 4-Channel Regulated Charge Pump White LED Driver FEATURES DESCRIPTION Drives individually up to 4 LEDs Output current up to 30mA per LED Digital control On/Off of each LED Compatible with supply voltage of 3V to 5.5V Power efficiency up to 93% 2 modes of operation 1x and 1.5x Automatic short circuit detect/disable High-frequency Operation at 1MHz Low value ceramic capacitors "604" compatible pinout Soft start and current limiting TQFN 16-pad package, 4 x 4mm, 0.8mm max height The CAT3604 is a charge pump operating in either 1x (LDO) mode or 1.5x fractional mode regulating current through each of the 4 LED pins. Operation at a fixed high frequency of 1MHz typical allows the use of very small value ceramic capacitors. The CAT3604 drives white light-emitting diodes (LEDs) connected in parallel and provides tightly matched regulated current to achieve uniformity of brightness in LCD backlighting applications. An external resistor RSET controls the output current level. LED currents of up to 30mA are supported over a range of input supply voltages from 3V to 5.5V, making the device ideal for battery-powered applications. APPLICATION LED dimming can be accomplished by several methods including using a DC voltage to set the RSET pin current, applying a PWM signal on the Control signals, or adding a switched resistor in parallel with RSET. The Enable input pin allows the device to be placed in power-down mode with "zero” quiescent current. Color LCD and keypad Backlighting Cellular Phones Handheld Devices Digital Cameras PDAs Portable MP3 players The CAT3604 features short circuit and overcurrent limiting protection. The device is available in a 16-pad TQFN package with a max height of 0.8mm. ORDERING INFORMATION Part Number Quantity per Reel Marking Package CAT3604HV4-T2 TQFN-16 (1) 2000 G364 (2) 2000 CDBA CAT3604HV4-GT2 TQFN-16 For Ordering Information details, see page 11. Notes: (1) Matte-Tin Plated Finish (RoHS-compliant). (2) NiPdAu Plated Finish (RoHS-compliant). TYPICAL APPLICATION CIRCUIT 1µF C1+ C1- C2+ VIN Battery VIN 3V to 4.2V CIN 1µF EN EN C2VOUT CTR0 LED1 Control 1 CTR1 LED2 Control 2 CTR2 LED3 RSET VOUT COUT CAT3604 Control 0 RSET 24kΩ © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1µF GND 1 1µF 20mA LED4 Doc. No. MD-5008 Rev. J CAT3604 PIN CONFIGURATION (1) TQFN 16-pad (4 x 4mm) (Top View) CTR1 3 CTR2 4 LED4 2 LED3 CTR0 LED2 1 LED1 EN 16 15 14 13 12 GND 11 C2+ GND 10 C29 C15 6 7 8 RSET VOUT VIN C1+ PIN DESCRIPTIONS Pin Number Name Function 1 EN 2 CTR0 Digital control input 0 3 CTR1 Digital control input 1 4 CTR2 Digital control input 2 5 RSET The LED output current is set by the current sourced out of the RSET pin 6 VOUT Charge pump output connected to the LED anodes 7 VIN Supply voltage 8 C1+ Bucket capacitor 1 terminal 9 C1 Bucket capacitor 1 terminal 10 C2 Bucket capacitor 2 terminal 11 C2+ Bucket capacitor 2 terminal Enable input, active HIGH 12 GND Ground reference 13 LED4 LED 4 cathode terminal 14 LED3 LED 3 cathode terminal 15 LED2 LED 2 cathode terminal 16 LED1 LED 1 cathode terminal Pad GND Pad Ground reference Notes: (1) The package exposed pad is electrically connected inside the package to GND and to pin 12. Doc. No. MD-5008 Rev. J 2 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT3604 ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit VIN, VOUT, LEDx voltage -0.3 to 7.0 V EN, CTRx voltage -0.3 to VIN V RSET voltage -0.3 to VIN V RSET current ±1 mA Ambient Temperature Range -40 to +85 ºC Storage Temperature Range -65 to +160 ºC Lead Temperature ESD Ratings Human Body Model (HBM) Machine Model (MM) (1) 300 ºC 2000 200 V V RECOMMENDED OPERATING CONDITIONS Parameter Range Unit VIN 3.0 to 5.5 V Ambient Temperature Range -40 to +85 ºC 1 ± 20% typical µF 0 to 30 mA Input/Output/Bucket Capacitors ILED per LED pin Typical application circuit with external components is shown on page 1. ELECTRICAL OPERATING CHARACTERISTICS Limits over recommended operating conditions unless specified otherwise. Typical values at TA = 25˚C, VIN = 3.5V, IRSET = 5µA Symbol IQ Parameter Conditions Quiescent Current VEN = 0V Shutdown Mode 1x Mode, No Load 1.5x Mode, No Load VRSET RSET Regulated Voltage ILED Programmed LED Current Min Typ Max Unit 1.17 0.05 0.3 2.6 1.2 1 1 5 1.23 µA mA mA V IRSET = 5µA IRSET = 37µA IRSET = 78µA 0.5mA < ILED < 3mA 3mA < ILED < 30mA 2.4 15.0 30.0 +15 +5 mA mA mA % % % ILED-ACC LED Current Accuracy ILED-DEV LED Channel Matching (ILED - ILEDAVG) / ILEDAVG +3 ROUT Output Resistance (Open Loop) 1x Mode 1.5x Mode, IOUT = 100mA 1.4 6.5 2.5 10 Ω Ω fOSC Charge Pump Frequency 0.8 1.0 1.3 MHz 0.4 0.6 0.9 ms 0.001 0.8 0457 1 1.3 60 600 µA V V mA TDROPOUT IEN-CTR VEN-CTR ISC ILIM 1x to 1.5x Mode Transition Dropout Delay Input Leakage Current High Detect Threshold Low D t Current t Th hLimit ld Input Maximum Input Current On Inputs EN, CTR0, 1 & 2 On Inputs EN, CTR0, 1 & 2 VOUT = GND VOUT > 1V 0.4 30 200 400 mA Notes: (1) Machine model is with 200pF capacitor discharged directly into each pin. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 3 Doc. No. MD-5008 Rev. J CAT3604 BLOCK DIAGRAM 1µF C1- VIN 3V to 4.2V C1+ C2- C2+ 1x mode (LDO) VIN Battery 1µF VOUT 1.5x Charge Pump CIN COUT 1µF 1µF Mode Control 1MHz Oscillator EN LED1 LED2 20mA LED3 1.2V Ref LED4 RSET RSET 24kΩ CTR0 CTR1 CTR2 Current Setting 4 Current Sink Regulators LED Output Select GND Figure 1. CAT3604 Functional Block Diagram BASIC OPERATION At power-up, the CAT3604 starts operation in 1x mode. If it is able to drive the programmed LED current, it continues in 1x mode. If the battery voltage drops to a level where the LED current cannot be met, the driver automatically switches into 1.5x mode. The 1.5x charge pump will boost the output voltage accordingly to achieve the nominal LED current. Doc. No. MD-5008 Rev. J The operating mode is reinitialized each and every time the chip is powered up or is taken out of shutdown mode (via EN pin). The use of the control pins (CTR0, CTR1, CTR2) does not reconfigure the mode of operation. 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT3604 LED CURRENT SETTING The LED current is set by the external resistor RSET connected between the RSET pin and ground. Table 1 lists various LED currents and the associated RSET resistor value for standard 1% precision surface mount resistors. SHORT CIRCUIT DETECT/DISABLES The unused LED channels can also be turned off by connecting the respective LED pins to VOUT. In which case, the corresponding LED driver is disabled and the typical LED sink current is only about 20µA. When the following equation is true on any channel, the driver turns off the LED channel: Table 1. RSET Resistor Selection LED Current (mA) RSET (kΩ) 1 649 2 287 5 102 10 49.9 15 32.4 20 23.7 30 15.4 VOUT - VLED ≤ 1V (LED channel OFF) Note: The CAT3604 is designed to drive LEDs with forward voltage greater than 1V and is not compatible with resistive loads. The digital control lines CTR0, CTR1 adn CTR2 allow to turn On or Off a combition of LEDs as shown in Table 2. Table 2: LED Selection Control Lines LED Outputs CTR2 CTR1 CTR0 LED4 LED3 LED2 LED1 0 0 0 – – – ON 0 0 1 – – ON – 0 1 0 – – – 0 1 1 ON ON – – – 1 0 0 – – ON ON 1 0 1 – ON ON ON 1 1 0 ON ON ON ON 1 1 1 – – – – Notes: 1 = logic high (or VIN) 0 = logic low (or GND) – = LED output OFF © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5 Doc. No. MD-5008 Rev. J CAT3604 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, RSET = 24kΩ, TAMB = 25ºC, unless otherwise specified. Efficiency vs. Input Voltage (4 LEDs) Efficiency vs. Total LED Current (4 LEDs) 100 100 1x mode 80 1.5x mode 70 60 20m A per LED 50 VIN = 4V (1x mode) 90 EFFICIENCY (% ) EFFICIENCY (%) 90 15m A per LED 40 80 70 60 VIN = 3.2V (1.5x mode) 50 40 4.2 4.0 3.8 3.6 3.4 3.2 3.0 0 DISCHARGING BATTERY [V] LED Current vs. Input Voltage 150 200 16.0 LED CURRENT [mA] 1 LED at 20mA 22 LED CURRENT [mA] 100 LED Current vs. Temperature 24 20 4 LEDs at 20m A 18 16 14 4 LEDs at 15m A 12 10 4 LEDs at 15mA Vin = 4V 15.5 15.0 14.5 14.0 3.0 3.2 3.4 3.6 3.8 4.0 4.2 -50 -25 INPUT VOLT AGE [V] 0 25 50 75 100 125 TEMPERATURE [ºC] Ground Current vs. Input Voltage (1x mode) Ground Current vs. Temperature (1x mode) 0.5 0.5 GROUND CURRENT [mA] GROUND CURRENT [mA] 50 TOTA L LED CURRENT [mA] 0.4 0.3 0.2 4 LEDs OFF 0.1 0.0 3.0 Doc. No. MD-5008 Rev. J 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 0.4 0.3 0.2 0.1 4 LEDs OFF Rset = 500kΩ 0.0 4.2 -40 -20 0 20 40 60 80 100 TEMPERATURE [ºC] 6 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT3604 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, RSET = 24kΩ, TAMB = 25ºC, unless otherwise specified. Ground Current vs. Input Voltage (1.5x mode) Supply Current vs. Input Voltage 100 SUPPLY CURRENT [mA] GROUND CURRENT [mA] 5.0 4.0 3.0 2.0 VIN = 3.6V all LEDs open 1.0 80 1.5x mode 60 40 20 4 LEDs at 15mA 0 0.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLT AGE [V] 3.0 4.2 3.2 3.4 3.6 3.8 4.0 INPUT VOLT AGE [V] 4.2 Oscillator Frequency vs. Input Voltage Oscillator Frequency vs. Temperature 1.10 1.10 CLOCK FREQUENCY[MHz] CLOCK FREQUENCY [MHz] 3.0 1.05 1.00 4 LEDs at 20mA 0.95 0.90 3.0 3.2 3.4 3.6 3.8 4.0 1.05 1.00 0.95 VIN = 3.6V 4 LEDs at 15mA 0.90 4.2 -40 -20 0 20 40 60 80 100 TEMPERATURE [ºC ] INPUT VOLTAGE [V] Output Resistance vs. Input Voltag e (1x mode) Output Resistance vs. Input Voltag e (1.5x mode) 4 ] 10 OUTPUT RESISTANCE ] OUTPUT RESISTANCE 1x mode 3 100mA load 2 1 0 8 100mA load 6 25mA load 4 2 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 4.2 3.0 7 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2 Doc. No. MD-5008 Rev. J CAT3604 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, RSET = 24kΩ, TAMB = 25ºC, unless otherwise specified. Doc. No. MD-5008 Rev. J 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT3604 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, CIN = COUT = 1µF, unless otherwise specified. Foldback Current Limiting OUTPUT VOLTAGE [V] 5 1x mode 4 3 2 1 0 0 100 200 300 400 OUTPUT CURRENT [mA] 500 RECOMMENDED LAYOUT When the driver is in the 1.5x charge pump mode, the 1MHz switching frequency operation requires to minimize trace length and impedance to ground on all 4 capacitors. A ground plane should cover the area on the bottom side of the PCB opposite to the IC and the bypass capacitors. Capacitors Cin and Cout require short connection to ground which can be done with multiple vias as shown on Figure 2. A square copper area matches the QFN16 exposed pad (GND) which is connected by a trace to the pin 12 pad (GND). A large via (metalized hole) centered in the square pad provides a low impedance connection to the ground plane on the opposite side of the PCB and allows the heat dissipated by the driver IC to spread out resulting in excellent thermal performance. 4.41mm 1.95mm 2.25mm 0.65mm 0.76mm 2.25mm 0.35mm Figure 2. PCB Layout © Catalyst Semiconductor, Inc. Characteristics subject to change without notice Figure 3. Recommended QFN 16 Package Land Pattern 9 Doc. No. MD-5008 Rev. J CAT3604 PACKAGE OUTLINE DRAWING TQFN 16-Pad 4 x 4mm (HV4) (1)(2) A D DETAIL A E2 E PIN#1 ID PIN#1 INDEX AREA TOP VIEW SYMBOL MIN SIDE VIEW NOM A 0.70 0.75 0.80 0.00 0.02 0.05 e b 0.20 REF b 0.25 0.30 0.35 D 3.90 4.00 4.10 D2 2.00 – 2.25 E 3.90 4.00 4.10 E2 2.00 – 2.25 e L BOTTOM VIEW MAX A1 A3 D2 A1 L DETAIL A A 0.65 BSC 0.45 – 0.65 A3 A1 FRONT VIEW 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-220. Doc. No. MD-5008 Rev. J 10 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT3604 EXAMPLE OF ORDERING INFORMATION 1 Prefix CAT Device # Suffix 3604 HV4 –G Product Number 3604 Optional Company ID Lead Finish G: NiPdAu Blank: Matte-Tin T2 Tape & Reel T: Tape & Reel 2: 2,000/Reel Package HV4: TQFN 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 CAT3604HV4-GT2 (TQFN, NiPdAu Plated Finish, Tape & Reel, 2,000/Reel). (4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 11 Doc. No. MD-5008 Rev. J REVISION HISTORY Date Rev. 19-Aug-04 A Initial issue 21-Sept-04 B Minor Changes 22-Sept-04 C Added Green package in all areas 29-Sept-04 D Minor Changes 4-Jan-05 E Added QFN land pattern (figure 3) 21-Jan-05 F Minor Changes 15-Apr-05 G Update Features Update Short Circuit Detect/Disable 06-June-05 H Update Ordering Information 15-July-05 I Update Basic Operation J Add MD- to documenr number Update Package Outline Drawing Delete PbSn plated finish; add NiPdAu plated finish Add Example of Ordering Information 30-May-08 Reason Copyrights, Trademarks and Patents © Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Adaptive Analog™, Beyond Memory™, DPP™, EZDim™, LDD™, MiniPot™, Quad-Mode™ and Quantum Charge Programmable™ 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 0Hwww.catsemi.com Document No: MD-5008 Revision: J Issue date: 05/30/2008