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| CAT3606 6-Channel Low Noise Charge Pump White LED Driver FEATURES Drives up to 4 main LEDs and 2 sub LEDs Separate control for main and sub LEDs Compatible with supply voltage of 3V to 5.5V Power efficiency up to 90% Output current up to 30mA per LED High-frequency Operation at 1MHz 2 modes of operation 1x and 1.5x White LED detect circuitry on all channels Shutdown current less than 1A Small ceramic capacitors Soft start and current limiting Short circuit protection 16-pad TQFN package, 0.8mm max height DESCRIPTION The CAT3606 controls up to four LEDs for the main display and two LEDs for the sub-display in cellular phones. The device is capable of operating in either 1x (LDO) mode or 1.5x charge pump mode. All LED pin currents are regulated and tightly matched to achieve uniformity of brightness across the LCD backlight. An external resistor (RSET) sets the nominal output current. The device can deliver as much as 20mA per channel during low voltage operation (3V), and 30mA per channel during nominal operation (3.3V). A constant high-frequency switching scheme (1MHz) provides low noise and allows the use of very small value ceramic capacitors.. A "zero" quiescent current mode can be achieved via the chip enable pin EN. The Main and Sub LEDs each have their own dedicated ON/OFF control pins ENM, ENS Dimming can be achieved using either a DC voltage to control the RSET pin current, or by applying a PWM signal on the ENM and ENS pins. The device is available in a 16-pad TQFN package with a max height of 0.8mm. For Ordering Information details, see page 11. APPLICATION Cell phone main and sub-display backlight Navigation PDAs Digital Cameras ORDERING INFORMATION Part Number Package (1) (2) Quantity per Reel Marking 2000 2000 G366 CDBB CAT3606HV4-T2 TQFN-16 CAT3606HV4-GT2 TQFN-16 Notes: (1) Matte-Tin Plated Finish (RoHS-compliant). (2) NiPdAu Plated Finish (RoHS-compliant). TYPICAL APPLICATION CIRCUIT 1F 1F Li-Ion Battery C1+ VIN + CIN 1F ON/OFF ENABLE LED1-4 ENABLE LED5-6 RSET 24k EN ENM ENS RSET C1- C2+ C2VOUT Main Display Sub Display COUT 1F CAT3606 LED1 LED2 LED3 LED4 LED5 GND LED6 20mA (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 1 Doc. No. MD-5009 Rev. D CAT3606 PIN CONFIGURATION (1) TQFN 16-lead 4 x 4mm (Top view) LED5 LED4 LED3 LED2 16 LED6 EN ENM ENS 1 2 GND PAD 3 4 5 6 7 VIN 8 C1+ 10 C29 C115 14 13 12 LED1 11 C2+ RSET VOUT PIN DESCRIPTIONS Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PAD Name LED6 EN ENM ENS RSET VOUT VIN C1+ C1 C2 C2+ LED1 LED2 LED3 LED4 LED5 GND Function LED6 cathode terminal Enable/shutdown input, active high Enable "main" input for LED1 to LED4, active low Enable "sub" input for LED5 and LED6, active low 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 LED 1 cathode terminal LED 2 cathode terminal LED 3 cathode terminal LED 4 cathode terminal LED 5 cathode terminal Ground reference Notes: (1) The "exposed pad" under the package must be connected to the ground plane on the PCB. Doc. No. MD-5009 Rev. D 2 (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice CAT3606 ABSOLUTE MAXIMUM RATINGS Parameter VIN, VOUT, LEDx voltage EN, ENM, ENS voltage RSET voltage RSET current Ambient Temperature Range Storage Temperature Range Lead Temperature ESD Ratings Human Body Model (HBM) Machine Model (MM) (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 C C C V V RECOMMENDED OPERATING CONDITIONS Parameter VIN Ambient Temperature Range Input/Output/Bucket Capacitors ILED per LED pin IOUT Total Output Current Range 3.0 to 5.5 -40 to +85 1 20% Typical 0 to 30 0 to 150 Unit V C F mA mA ELECTRICAL OPERATING CHARACTERISTICS Limits over recommended operating conditions unless specified otherwise. Typical values at TA = 25C, VIN = 3.5V, IRSET = 5A. Symbol Parameter IQ VRSET ILED ILED ILED ILED-ACC ILED-DEV ROUT fOSC TDROPOUT IEN-CTR VEN-CTR ISC ILIM Quiescent Current RSET Regulated Voltage IRSET = 5A IRSET = 37A IRSET = 78A 3.3 VIN 4.5V LED Current Range with 6 LEDs 3.0 VIN 4.5V LED Current Range with 4 LEDs 3.3 VIN 4.5V 0.5mA ILED 3mA LED Current Accuracy 3mA ILED 30mA LED Channel Matching (ILED - ILEDAVG) / ILEDAVG Output Resistance (Open Loop) 1x Mode, 1.5x mode, IOUT = 100mA Programmed LED Current 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 0.8 0.4 Conditions VEN = 0V 1x Mode, No Load 1.5x Mode, No Load Min Typ 0.1 0.3 2.6 1.2 2.4 15.0 30.0 Max 1 1 5 1.23 Unit A mA mA V mA 30 20 30 15 5 3 1.4 6.5 1.0 0.6 2.5 10 1.3 0.9 1 0.4 30 200 0.8 0.7 45 400 1.3 60 600 mA mA % % MHz ms A V mA mA 1.17 On Inputs EN, ENM, ENS On Inputs EN, ENM, ENS VOUT = GND VOUT > 1V Notes: (1) Machine model is with 200pF capacitor discharged directly into each pin. (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 3 Doc. No. MD-5009 Rev. D CAT3606 BLOCK DIAGRAM 1F C1C1+ C21F C2+ VIN Battery VIN 3V to 4.2V CIN 1F 1x mode (LDO) 1.5x Charge Pump VOUT COUT 1MHz Oscillator Mode Control LED1 LED2 LED3 LED4 LED5 1.2V Ref Main Sub 6 Current Sink Regulators LED6 20mA 1F EN RSET RSET 24k ENM ENS Current Setting LED Output Select GND Figure 2. CAT3606 Functional Block Diagram BASIC OPERATION At power-up, the CAT3606 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, to boost the output voltage high enough to achieve the nominal LED current. The above sequence 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 Main and Sub display enable pins (ENM or ENS) does not affect the mode of operation. Doc. No. MD-5009 Rev. D 4 (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice CAT3606 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. Table 1. RSET Resistor Selection LED Current (mA) 1 2 5 10 15 20 30 RSET (k) 649 287 102 49.9 32.4 23.7 15.4 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 0.2mA. When the following equation is true on any channel, the driver turns off the LED channel: VOUT - VLED 1V (LED channel OFF) Note: The CAT3606 is designed to drive LEDs with forward voltage greater than 1V and is not compatible with resistive loads. The enable lines ENM and allow to turn On or ENS Off a group of LEDs as shown in Table 2. Table 2: LED Selection Control Lines EN 0 1 1 1 1 ENM X 1 0 1 0 ENS X 1 1 0 0 LED Outputs Main LED1 - LED4 - - ON - ON Sub LED5 -LED6 - - - ON ON Notes: 1 = logic high (or VIN) 0 = logic low (or GND) - = LED output OFF X = don't care (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 5 Doc. No. MD-5009 Rev. D CAT3606 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1F, RSET = 24k (20mA per LED), TAMB = 25C, unless otherwise specified. Efficiency vs. Input Voltage (6 LEDs) 100 90 EFFICIENCY [%] Efficiency vs. Total LED Current (6 LEDs) 100 1x mode EFFICIENCY [%] 90 VIN = 4V (1x mode ) 80 70 60 50 40 4.2 4.0 3.8 3.6 20mA per LED 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 INPUT VOLTAGE [V] TOTAL LED CURRENT [mA] LED Current Change vs. Input Voltage 1.5 LED CURRENT CHANGE [%] LED Current Change vs. Temperature 4 LED CURRENT CHANGE [%] 1.0 6 LEDs at 15mA 0.5 0.0 -0.5 -1.0 -1.5 3.0 3.2 3.4 3.6 3.8 4.0 4.2 3 2 1 0 -1 -2 -3 -4 -50 6 LEDs at 15mA VIN = 4V -25 0 25 50 75 100 125 INPUT VOLTAGE [V] TEMPERATURE [C] Ground Current vs. Input Voltage (1x mode) 0.5 0.4 0.3 0.2 6 LEDs OFF 0.1 0.0 3.0 GROUND CURRENT [mA] GROUND CURRENT [mA] Ground Current vs. Temperature (1x mode) 0.5 0.4 0.3 0.2 0.1 0.0 -40 -20 0 20 40 60 80 100 TEMPERATURE [C] 6 LEDs OFF RSET = 500k 3.2 3.4 3.6 3.8 4.0 4.2 INPUT VOLTAGE [V] Doc. No. MD-5009 Rev. D 6 (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice CAT3606 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1F, RSET = 24k (20mA per LED), TAMB = 25C, unless otherwise specified. Ground Current vs. Input Voltage (1.5x mode) 5.0 GROUND CURRENT [mA] GROUND CURRENT [mA] Supply Current vs. Input Voltage 140 1.5x mode 120 4.0 3.0 2.0 VIN = 3.6V all LEDs open 100 6 LEDs at 15mA 80 1.0 0.0 1x mode 3.0 3.2 3.4 3.6 3.8 4.0 4.2 3.0 3.2 3.4 3.6 3.8 4.0 4.2 INPUT VOLTAGE [V] INPUT VOLTAGE [V] Oscillator Frequency vs. Input Voltage 1.10 CLOCK FREQUENCY [MHz] CLOCK FREQUENCY [MHz] Oscillator Frequency vs. Temperature 1.10 1.05 1.05 1.00 6 LEDs at 20mA 0.95 1.00 0.95 VIN = 3.6V 6 LEDs at 15mA -40 -20 0 20 40 60 80 100 0.90 0.90 3.0 3.2 3.4 3.6 3.8 4.0 4.2 INPUT VOLTAGE [V] TEMPERATURE [C] Output Resistance vs. Input Voltage (1x mode) 4 OUTPUT RESISTANCE [] OUTPUT RESISTANCE [] Output Resistance vs. Input Voltage (1.5x mode) 10 3 100mA load 100mA load 2 8 6 100mA load 100mA load 4 1 0 2 3.0 3.2 3.4 3.6 3.8 4.0 4.2 3.0 3.2 INPUT VOLTAGE [V] 3.4 3.6 3.8 INPUT VOLTAGE [V] 4.0 4.2 (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 7 Doc. No. MD-5009 Rev. D CAT3606 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1F, RSET = 24k (20mA per LED), TAMB = 25C, unless otherwise specified. Switching Waveforms in 1.5x Mode Operating Waveforms in 1x Mode Power Up 6 LEDs at 15mA, VIN = 3V (1.5x Mode) Power Up 6 LEDs at 15mA, VIN = 3.6V (1x Mode) LED Current vs. R SET 100.0 Line Transient Response in 1x Mode LED CURRENT [mA] 10.0 1.0 0.1 10 100 RSET [k] 1000 10000 Doc. No. MD-5009 Rev. D 8 (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice CAT3606 TYPICAL CHARACTERISTICS VIN = 3.6V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1F, TAMB = 25C, unless otherwise specified. Foldback Current Limiting 5 4 3 2 1 0 0 100 200 300 400 500 OUTPUT CURRENT [mA] RSET Pin Voltage vs. Temperature 1.24 RSET PIN VOLTAGE [V] OUTPUT VOLTAGE [V] 1x mode 1.22 1.20 1.18 1.16 -50 -25 0 25 50 75 100 125 TEMPERATURE [C] PWM Dimming at 1kHz on ENM and ENS 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) and must be connected to the ground plane underneath. The use of multiple via will improve the heat dissipation. Figure 2. PCB Layout (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 9 Doc. No. MD-5009 Rev. D CAT3606 PACKAGE OUTLINE DRAWING TQFN 16-Pad 4 x 4mm (HV4) (1)(2) D A DETAIL A E E2 PIN#1 ID D2 PIN#1 INDEX AREA TOP VIEW A1 SIDE VIEW BOTTOM VIEW SYMBOL MIN NOM MAX b e A A1 A3 b D D2 E E2 e L 0.70 0.00 0.25 3.90 2.00 3.90 2.00 0.45 0.75 0.02 0.20 REF 0.30 4.00 - 4.00 - 0.65 BSC - 0.80 0.05 0.35 4.10 2.25 4.10 2.25 0.65 A1 FRONT VIEW A3 A L DETAIL A 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-5009 Rev. D 10 (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice CAT3606 EXAMPLE OF ORDERING INFORMATION1 Prefix CAT Device # 3606 Suffix HV4 - G T2 Product Number 3606 Optional Company ID Package HV4: TQFN 4 x 4mm Lead Finish G: NiPdAu Blank: Matte-Tin(4) Tape & Reel T: Tape & Reel 2: 2,000/Reel 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 CAT3606HV4-GT2 (TQFN, NiPdAu Plated Finish, Tape & Reel, 2,000/Reel). (4) For Matte-Tin package option, please contact your nearest ON Semiconductor Sales office. (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice 11 Doc. No. MD-5009 Rev. D CAT3606 REVISION HISTORY Date 21-Jan-05 8-Jan-05 Rev. A B Reason Initial Issue Updated LED Current Setting Update Package Outline Drawing Delete PbSn plated finish; add NiPdAu plated finish Add Example of Ordering Information Add Top Mark Code Link Add MD- to document number Change logo and fine print to ON Semiconductor 30-May-08 C 12-Nov-08 D ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC 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 SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center: Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative Doc. No. MD-5009 Rev. D 12 (c) 2008 SCILLC. All rights reserved. Characteristics subject to change without notice |
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