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| CAT3604 4-Channel Regulated Charge Pump White LED Driver FEATURES I I I I I 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 I I Automatic short circuit detect/disable I High-frequency Operation at 1MHz Low value ceramic capacitors I "604" compatible pinout I Soft start and current limiting I Thin QFN 16-lead package, 4x4mm, 0.8mm max height Power efficiency up to 93% I 2 modes of operation 1x and 1.5x APPLICATIONS I Color LCD and keypad Backlighting I Cellular Phones I Handheld Devices I I Digital Cameras I PDAs Portable MP3 players DESCRIPTION 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. 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. The CAT3604 features short circuit and overcurrent limiting protection. The device is available in a 16lead thin QFN package with a max height of 0.8mm. TYPICAL APPLICATION C1+ VIN Battery + VIN 3V to 4.2V EN CIN Control 0 Control 1 Control 2 EN CTR0 CTR1 CTR2 RSET GND RSET C1- C2+ C2VOUT COUT CAT3604 LED1 LED2 LED3 LED4 20mA (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 5008, Rev. I CAT3604 ORDERING INFORMATION Part Number CAT3604HS4-TE13 CAT3604HV4-TE13 Package Thin QFN-16 4x4mm Thin QFN-16 4x4mm Lead Free Top View LED1 LED2 LED3 LED4 16 EN 1 15 14 13 12 GND 11 C2+ GND CTR1 3 10 C29 C15 6 7 VIN 8 C1+ Quantity per Reel 2000 2000 Package Marking C364 G364 PIN CONFIGURATION CTR0 2 CTR2 4 RSET VOUT 16-lead Thin QFN (4mm x 4mm) Note: The package exposed pad is electrically connected inside the package to GND and to pin 12. PIN DESCRIPTIONS Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pad Name EN CTR0 CTR1 CTR2 RSET VOUT VIN C1+ C1C2C2+ GND LED4 LED3 LED2 LED1 GND Pad Function Enable input, active HIGH Digital control input 0 Digital control input 1 Digital control input 2 The LED output current is set by the current sourced out of the RSET pin Charge pump output connected to the LED anodes Supply voltage Bucket capacitor 1 terminal Bucket capacitor 1 terminal Bucket capacitor 2 terminal Bucket capacitor 2 terminal Ground reference LED 4 cathode terminal LED 3 cathode terminal LED 2 cathode terminal LED 1 cathode terminal Ground reference Doc. No. 5008, Rev. I 2 (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT3604 ABSOLUTE MAXIMUM RATINGS Parameter VIN, VOUT, LEDx voltage EN, CTRx voltage RSET voltage RSET current Ambient Temperature Range Storage Temperature Range Lead Temperature ESD Ratings Human Body Model (HBM) Machine Model (MM) (note 1) Note 1: Rating -0.3 to 7.0 -0.3 to VIN -0.3 to VIN +1 -40 to +85 -65 to +160 300 2000 200 Unit V V V mA o C C C o o V V Machine model is with 200pF capacitor discharged directly into each pin. RECOMMENDED OPERATING CONDITIONS Parameter VIN Ambient Temperature Range Input/Output/Bucket Capacitors ILED per LED pin Rating 3.0 to 5.5 -40 to +85 1 +20% typical 0 to 30 Unit V o C F mA ELECTRICAL OPERATING CHARACTERISTICS Limits over recommended operating conditions unless specified otherwise. Typical values at TA = 25C, VIN = 3.5V, IRSET = 5A Symbol IQ VRSET ILED ILED-ACC ILED-DEV ROUT fOSC TDROPOUT IEN-CTR VEN-CTR ISC ILIM Parameter Quiescent Current RSET Regulated Voltage Programmed LED Current LED Current Accuracy LED Channel Matching Output Resistance (Open Loop) Charge Pump Frequency 1x to 1.5x Mode Transition Dropout Delay Input Leakage Current High Detect Threshold Low Detect Threshold Input Current Limit Maximum Input Current On Inputs EN, CTR0, 1 & 2 On Inputs EN, CTR0, 1 & 2 VOUT = GND VOUT > 1V 3 Conditions VEN = 0V Shutdown Mode 1x Mode, No Load 1.5x Mode, No Load Min Typ 0.05 0.3 2.6 Max 1 1 5 1.23 Unit A mA mA V mA mA mA % % 1.17 IRSET = 5A IRSET = 37A IRSET = 78A 0.5mA < ILED < 3mA 3mA < ILED < 30mA (ILED - ILEDAVG) / ILEDAVG 1x Mode 1.5x Mode, IOUT = 100mA 0.8 0.4 1.2 2.4 15.0 30.0 +15 +5 +3 1.4 6.5 1.0 0.6 0.001 2.5 10 1.3 0.9 1 1.3 60 600 % MHz ms A V V mA mA 0.4 30 200 0.8 0.7 45 400 (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc. No. 5008, Rev. I CAT3604 BLOCK DIAGRAM C1C1+ C2C2+ 3 VIN CIN 1x mode (LDO) 1.5x Charge Pump VOUT COUT 1MHz Oscillator EN Mode Control LED1 LED2 1.2V Ref RSET Current Setting LED Output Select LED3 LED4 20mA CTR0 CTR1 CTR2 4 Current Sink Regulators 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. 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. Doc. No. 5008, Rev. I 4 (c) 2005 by 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. LED Current (mA) 1 2 5 10 15 20 30 RSET (k) 649 287 102 49.9 32.4 23.7 15.4 SHORT CIRCUIT DETECT/DISABLE 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 20A. When the following equation is true on any channel, the driver turns off the LED channel: 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. Table 1. RSET Resistor Selection The digital control lines CTR0, CTR1 adn CTR2 allow to turn On or Off a combition of LEDs as shown in Table 2. Control Lines CTR2 0 0 0 0 1 1 1 1 CTR1 0 0 1 1 0 0 1 1 CTR0 0 1 0 1 0 1 0 1 LED4 ON ON ON ON ON - LED Outputs LED3 LED2 ON ON ON ON LED1 ON ON ON ON - Table 2: LED Selection Notes: 1 = logic high (or VIN) 0 = logic low (or GND) - = LED output OFF (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5 Doc. No. 5008, Rev. I CAT3604 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, CIN = COUT = 1F, RSET = 24k, TAMB = 25C, unless otherwise specified. Efficiency vs. Input Voltage (4 LEDs) 100 90 1x mode Efficiency vs. Total LED Current (4 LEDs) 100 90 VIN = 4V (1x mode) EFFICIENCY (%) 80 70 60 20mA per LED 50 40 4.2 4.0 3.8 3.6 EFFICIENCY (%) 1.5x mode 80 70 60 50 40 VIN = 3.2V (1.5x mode) 15mA per LED 3.4 3.2 3.0 0 50 100 150 200 DISCHARGING BATTERY [V] TOTAL LED CURRENT [mA] LED Current vs. Input Voltage 24 22 1 LED at 20mA LED Current vs. Temperature 16.0 LED CURRENT [mA] LED CURRENT [mA] 20 18 16 14 12 10 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2 4 LEDs at 15mA 4 LEDs at 20mA 15.5 4 LEDs at 15mA Vin = 4V 15.0 14.5 14.0 -50 -25 0 25 50 75 100 125 TEMPERATURE [C] Ground Current vs. Input Voltage (1x mode) 0.5 Ground Current vs. Temperature (1x mode) 0.5 GROUND CURRENT [mA] 0.4 0.3 0.2 4 LEDs OFF 0.1 0.0 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2 GROUND CURRENT [mA] 0.4 0.3 0.2 0.1 0.0 -40 -20 0 20 40 60 80 100 TEMPERATURE [C] (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 4 LEDs OFF Rset = 500k Doc. No. 5008, Rev. I 6 CAT3604 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, CIN = COUT = 1F, RSET = 24k, TAMB = 25C, unless otherwise specified. Ground Current vs. Input Voltage (1.5x mode) 5.0 GROUND CURRENT [mA] SUPPLY CURRENT [mA] Supply Current vs. Input Voltage 100 80 1.5x mode 60 40 20 4 LEDs at 15mA 0 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2 1x mode 4.0 3.0 2.0 1.0 0.0 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2 VIN = 3.6V all LEDs open Oscillator Frequency vs. Input Voltage 1.10 CLOCK FREQUENCY [MHz] Oscillator Frequency vs. Temperature 1.10 CLOCK FREQUENCY[MHz] 1.05 1.05 1.00 4 LEDs at 20mA 0.95 1.00 0.95 VIN = 3.6V 4 LEDs at 15mA 0.90 3.0 3.2 3.4 3.6 3.8 4.0 4.2 INPUT VOLTAGE [V] 0.90 -40 -20 0 20 40 60 80 100 TEMPERATURE [C] Output Resistance vs. Input Voltage (1x mode) 4 ] Output Resistance vs. Input Voltage (1.5x mode) 10 ] OUTPUT RESISTANCE 3 100mA load 2 OUTPUT RESISTANCE 8 100mA load 6 25mA load 4 1 0 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2 2 3.0 3.2 3.4 3.6 3.8 4.0 INPUT VOLTAGE [V] 4.2 (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 7 Doc. No. 5008, Rev. I CAT3604 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, CIN = COUT = 1F, RSET = 24k, TAMB = 25C, unless otherwise specified. Switching Waveforms in 1.5x Mode Operating Waveforms in 1x Mode Power Up 4 LEDs at 15mA, Vin = 3V (1.5x Mode) Power Up 4 LEDs at 15mA, Vin = 3.6V (1x Mode) LED Current vs. RSET 100 Line Transient Response in 1x Mode LED CURRENT [mA] 10 1 10 100 RSET [kohm] 1000 Doc. No. 5008, Rev. I 8 (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT3604 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, CIN = COUT = 1F, unless otherwise specified. Foldback Current Limiting 5 OUTPUT VOLTAGE [V] 4 3 2 1 0 0 100 200 300 400 OUTPUT CURRENT [mA] 500 1x mode 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. 0.65 mm 2.25 mm 2.25 mm 0.76 mm 0.35 mm Figure 2: PCB Layout Figure 3: Recommended QFN 16 Package Land Pattern (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 9 1.95 mm Doc. No. 5008, Rev. I 4.41 mm CAT3604 PACKAGE DRAWING AND DIMENSIONS THIN QFN 16-LEAD 4MM X 4MM Recommended Land Pattern 0.65 mm 4.00+0.10 (S) 1.95 mm 2.25 mm 2.25 mm PIN 1 INDEX AREA 4.00+0.10 (S) 0.76 mm 0.35 mm 0.20 REF. 0.75+0.05 DAP SIZE 2.5 X 2.5 2.10+0.10 2.10+0.10 C0.35 NOTE: 1. ALL DIMENSIONS ARE IN mm. ANGLES IN DEGREES. 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. COPLANARITY SHALL NOT EXCEED 0.08mm. 3. WARPAGE SHALL NOT EXCEED 0.10mm. 4. PACKAGE LENGTH/PACKAGE WIDTH ARE CONSIDERED AS SPECIAL CHARACTERISTIC. (S) 0.55+0.10 0.0-0.05 0.30+0.05 0.65 TYP 1.95 REF. (2x) Doc. No. 5008, Rev. I 10 (c) 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 4.41 mm REVISION HISTORY Date 8/19/2004 9/21/2004 9/22/2004 9/29/2004 1/4/2005 1/21/2005 04/15/2005 06/06/2005 07/15/2005 Rev. A B C D E F G H I Reason Initial issue Minor Changes Added Green package in all areas Minor Changes Added QFN land pattern (figure 3) Minor Changes Update Features Update Short Circuit Detect/Disable Update Ordering Information Update Basic Operation Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: DPP TM AE2 TM MiniPotTM Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents issued to Catalyst Semiconductor contact the Company's corporate office at 408.542.1000. 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 1250 Borregas Avenue Sunnyvale, CA 94089 Phone: 408.542.1000 Fax: 408.542.1200 www.caalyst-semiconductor.com Publication #: Revison: Issue date: 5008 I 07/15/05 |
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