CAT3604HV4

H CAT3604 EE GEN FR ALO 4-Channel Regulated Charge Pump White LED Driver LE FEATURES A D F R E ETM ■ ■ Drives individually up to 4 LEDs ■ Output current up to 30mA per LED Automatic short circuit detect/disable ■ High-frequency Operation at 1MHz ■ Digital control On/Off of each LED ■ ■ Compatible with supply voltage of 3V to 5.5V Low value ceramic capacitors ■ "604" compatible pinout ■ Soft start and current limiting ■ Thin QFN 16-lead package, 4x4mm, 0.8mm max height ■ Power efficiency up to 93% ■ 2 modes of operation 1x and 1.5x APPLICATIONS ■ ■ Color LCD and keypad Backlighting ■ Cellular Phones ■ Handheld Devices Digital Cameras ■ PDAs ■ Portable MP3 players DESCRIPTION 5.5V, making the device ideal for battery-powered applications. 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. 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 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 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+ C1- C2+ C2VOUT VIN COUT Battery + VIN 3V to 4.2V EN CIN EN CAT3604 Control 0 CTR0 LED1 Control 1 CTR1 LED2 Control 2 CTR2 LED3 20mA LED4 RSET GND RSET © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc. No. 5008, Rev. G 1 CAT3604 ORDERING INFORMATION Part Number Package Quantity per Reel Package Marking CAT3604HS4 Thin QFN-16 4x4mm 2000 C364 CAT3604HV4 Thin QFN-16 4x4mm Lead Free 2000 G364 PIN CONFIGURATION Top View LED1 LED2 LED3 LED4 16 15 14 13 EN 1 12 GND CTR0 2 11 C2+ CTR1 3 10 C2- CTR2 4 9 C1- GND 5 6 RSET VOUT 7 8 VIN C1+ 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 Name Function 1 EN Enable input, active HIGH 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 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 Doc. No. 5008, Rev. G 2 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 o C Storage Temperature Range -65 to +160 o C Lead Temperature 300 o C ESD Ratings Human Body Model (HBM) Machine Model (MM) (note 1) 2000 200 Note 1: V V Machine model is with 200pF capacitor discharged directly into each pin. RECOMMENDED OPERATING CONDITIONS Parameter Rating Unit VIN 3.0 to 5.5 V Ambient Temperature Range -40 to +85 Input/Output/Bucket Capacitors o C 1 +20% typical µF 0 to 30 mA ILED per LED pin ELECTRICAL OPERATING CHARACTERISTICS Limits over recommended operating conditions unless specified otherwise. Typical values at TA = 25˚C, VIN = 3.5V, IRSET = 5µA Symbol Parameter Conditions Min IQ Quiescent Current VEN = 0V Shutdown Mode 1x Mode, No Load 1.5x Mode, No Load VRSET RSET Regulated Voltage ILED Programmed LED Current IRSET = 5µA IRSET = 37µA IRSET = 78µA 2.4 15.0 30.0 mA mA mA ILED-ACC LED Current Accuracy 0.5mA < ILED < 3mA 3mA < ILED < 30mA +15 +5 % % 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 TDROPOUT 1x to 1.5x Mode Transition Dropout Delay 0.4 0.6 0.9 ms IEN-CTR Input Leakage Current On Inputs EN, CTR0, 1 & 2 0.001 1 µA VEN-CTR High Detect Threshold Low Detect Threshold On Inputs EN, CTR0, 1 & 2 0.8 0.7 1.3 0.4 V V ISC Input Current Limit VOUT = GND 30 45 60 mA ILIM Maximum Input Current VOUT > 1V 200 400 600 mA 1.17 3 Typ Max Unit 0.05 0.3 2.6 1 1 5 µA mA mA 1.2 1.23 V Doc. No. 5008, Rev. G CAT3604 BLOCK DIAGRAM C1- 3