CAT3606HV4-GT2

CAT3606 6-Channel Low Noise Charge Pump White LED Driver 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 20 mA per channel during low voltage operation (3 V), and 30 mA per channel during nominal operation (3.3 V). A constant high-frequency switching scheme (1 MHz) 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 0.8 mm. Features http://onsemi.com TQFN−16 HV4 SUFFIX CASE 510AE PIN CONNECTIONS (Note 1) LED5 LED4 LED3 LED2 LED6 EN ENM ENS 1 LED1 GND C2+ C2− C1− • • • • • • • • • • • • • • Drives up to 4 Main LEDs and 2 Sub LEDs Separate Control for Main and Sub LEDs Compatible with Supply Voltage of 3 V to 5.5 V Power Efficiency up to 90% Output Current up to 30 mA per LED High−frequency Operation at 1 MHz 2 Modes of Operation 1x and 1.5x White LED Detect Circuitry on All Channels Shutdown Current less than 1 mA Small Ceramic Capacitors Soft Start and Current Limiting Short Circuit Protection 16−pad TQFN Package, 0.8 mm Max Height These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Cell Phone Main and Sub−display Backlight Navigation PDAs Digital Cameras RSET (4 x 4 mm) (Top View) MARKING DIAGRAMS G366 CDBB G366 = CAT3606HV4−T2 CDBB = CAT3606HV4−GT2 ORDERING INFORMATION Device CAT3606HV4−T2 CAT3606HV4−GT2 Package TQFN−16 (Note 2) TQFN−16 (Note 3) Shipping 2,000/ Tape & Reel Applications • • • • 1. The “exposed pad” under the package must be connected to the ground plane on the PCB. 2. Matte−Tin Plated Finish (RoHS−compliant). 3. NiPdAu Plated Finish (RoHS−compliant). VOUT © Semiconductor Components Industries, LLC, 2010 January, 2010 − Rev. 3 1 Publication Order Number: CAT3606/D C1+ VIN CAT3606 1 mF C1+ VIN CIN 1 mF ON/OFF ENABLE LED1−4 ENABLE LED5−6 RSET 24 kW EN ENM ENS RSET GND CAT3606 LED1 LED2 LED3 LED4 LED5 LED6 20 mA 1 mF Li−Ion Battery + − C1− C2+ C2− VOUT Main Display Sub Display COUT 1 mF Figure 1. Typical Application Circuit Table 1. PIN DESCRIPTION Pin # 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 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 Function http://onsemi.com 2 CAT3606 Table 2. 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 Rating HBM (Human Body Model) ESD Rating MM (Machine Model) (Note 4) Rating −0.3 to 7.0 −0.3 to VIN −0.3 to VIN ±1 −40 to +85 −65 to +160 300 2,000 200 Unit V V V mA _C _C _C V V Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 4. Machine model is with 200 pF capacitor discharged directly into each pin. Table 3. 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 mF mA mA Table 4. ELECTRICAL OPERATING CHARACTERISTICS Symbol IQ Parameter Quiescent Current (Limits over recommended operating conditions unless specified otherwise. Typical values at TA = 25°C, VIN = 3.5 V, IRSET = 5 mA.) Conditions VEN = 0 V 1x Mode, No Load 1.5x Mode, No Load 1.17 IRSET = 5 mA IRSET = 37 mA IRSET = 78 mA 3.3 ≤ VIN ≤ 4.5 V 3.0 ≤ VIN ≤ 4.5 V 3.3 ≤ VIN ≤ 4.5 V 0.5 mA ≤ ILED ≤ 3 mA 3 mA ≤ ILED ≤ 30 mA (ILED – ILEDAVG) / ILEDAVG 1x Mode, 1.5x Mode, IOUT = 100 mA 0.8 0.4 On Inputs EN, ENM, ENS On Inputs EN, ENM, ENS 0.4 VOUT = GND VOUT > 1 V 30 200 0.8 0.7 45 400 ±15 ±5 ±3 1.4 6.5 1.0 0.6 2.5 10 1.3 0.9 1 1.3 60 600 Min Typ 0.1 0.3 2.6 1.2 2.4 15.0 30.0 30 20 30 Max 1 1 5 1.23 Unit mA mA mA V mA VRSET ILED RSET Regulated Voltage Programmed LED Current ILED ILED ILED−ACC ILED−DEV ROUT fOSC TDROPOUT IEN−CTR VEN−CTR ISC ILIM LED Current Range with 6 LEDs LED Current Range with 4 LEDs 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 mA mA % % W MHz ms mA V mA mA http://onsemi.com 3 CAT3606 Block Diagram 1 mF C1− C1+ C2− 1 mF C2+ VIN Battery VIN 3 V to 4.2 V CIN 1 mF 1x mode (LDO) 1.5x Charge Pump VOUT COUT 1 mF 1 MHz Oscillator EN Mode Control LED1 LED2 LED3 LED4 LED5 20 mA 1.2 V Ref RSET RSET 24 kW ENM ENS Current Setting LED Output Select GND Main Sub LED6 6 Current Sink Regulators Figure 2. CAT3606 Functional Block Diagram http://onsemi.com 4 CAT3606 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. LED Current Setting The enable lines ENM and ENS allow to turn On or Off a group of LEDs as shown in Table 6. Table 6. 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 The LED current is set by the external resistor RSET connected between the RSET pin and ground. Table 5 lists various LED currents and the associated RSET resistor value for standard 1% precision surface mount resistors. Table 5. RSET Resistor Selection LED Current (mA) 1 2 5 10 15 20 30 RSET (kW) 649 287 102 49.9 32.4 23.7 15.4 NOTES: 1 = logic high (or VIN) 0 = logic low (or GND) – = LED output OFF X = don’t care 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 0.2 mA. When the following equation is true on any channel, the driver turns off the LED channel: VOUT * V LED v 1 V (LED channel OFF) Note: The CAT3606 is designed to drive LEDs with forward voltage greater than 1 V and is not compatible with resistive loads. http://onsemi.com 5 CAT3606 TYPICAL CHARACTERISTICS (VIN = 3.6 V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1 mF, RSET = 24 kW (20 mA per LED), TAMB = 25°C, unless otherwise specified.) 100 90 EFFICIENCY (%) 80 15 mA per LED 70 20 mA per LED 60 50 40 1x Mode EFFICIENCY (%) 1.5x Mode 100 90 VIN = 4 V (1x Mode) 80 70 VIN = 3.2 V (1.5x Mode) 60 50 40 4.2 4.0 3.8 3.6 3.4 3.2 3.0 0 50 100 150 200 INPUT VOLTAGE (V) TOTAL LED CURRENT (mA) Figure 3. Efficiency vs. Input Voltage (6 LEDs) 1.5 LED CURRENT CHANGE (%) 1.0 0.5 6 LEDs at 15 mA 0 −0.5 −1.0 −1.5 LED CURRENT CHANGE (%) 4 3 2 1 0 −1 −2 −3 −4 −50 Figure 4. Efficiency vs. Total LED Current (6 LEDs) 6 LEDs at 15 mA VIN = 4 V 3.0 3.2 3.4 3.6 3.8 4.0 4.2 −25 0 25 50 75 100 125 INPUT VOLTAGE (V) TEMPERATURE (°C) Figure 5. LED Current vs. Input Voltage 0.5 GROUND CURRENT (mA) 0.4 0.3 0.2 6 LEDs Off 0.1 0 GROUND CURRENT (mA) 0.5 0.4 0.3 0.2 0.1 0 −40 Figure 6. LED Current Change vs. Temperature 6 LEDs OFF RSET = 500 kW −20 0 20 40 60 80 100 3.0 3.2 3.4 3.6 3.8 4.0 4.2 INPUT VOLTAGE (V) TEMPERATURE (°C) Figure 7. Ground Current vs. Input Voltage (1x Mode) Figure 8. Ground Current vs. Temperature (1x Mode) http://onsemi.com 6 CAT3606 TYPICAL CHARACTERISTICS (VIN = 3.6 V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1 mF, RSET = 24 kW (20 mA per LED), TAMB = 25°C, unless otherwise specified.) 5 GROUND CURRENT (mA) 4 3 2 1 0 VIN = 3.6 V all LEDs open GROUND CURRENT (mA) 140 1.5x Mode 120 100 6 LEDs at 15 mA 1x Mode 3.0 3.2 3.4 3.6 3.8 4.0 4.2 80 3.0 3.2 3.4 3.6 3.8 4.0 4.2 INPUT VOLTAGE (V) INPUT VOLTAGE (V) Figure 9. Ground Current vs. Input Voltage (1.5x Mode) 1.10 CLOCK FREQUENCY (MHz) CLOCK FREQUENCY (MHz) 1.10 Figure 10. Supply Current vs. Input Voltage 1.05 1.05 1.00 1.00 0.95 6 LEDs at 20 mA 0.90 3.0 3.2 3.4 3.6 3.8 4.0 4.2 0.95 VIN = 3.6 V 6 LEDs at 15 mA 0.90 −40 −20 0 20 40 60 80 100 INPUT VOLTAGE (V) TEMPERATURE (°C) Figure 11. Oscillator Frequency vs. Input Voltage 4 OUTPUT RESISTANCE (W) OUTPUT RESISTANCE (W) 10 Figure 12. Oscillator Frequency vs. Temperature 3 8 100 mA load 6 2 100 mA load 1 4 0 3.0 3.2 3.4 3.6 3.8 4.0 4.2 2 3.0 3.2 3.4 3.6 3.8 4.0 4.2 INPUT VOLTAGE (V) INPUT VOLTAGE (V) Figure 13. Output Resistance vs. Input Voltage (1x Mode) Figure 14. Output Resistance vs. Input Voltage (1.5x Mode) http://onsemi.com 7 CAT3606 TYPICAL CHARACTERISTICS (VIN = 3.6 V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1 mF, RSET = 24 kW (20 mA per LED), TAMB = 25°C, unless otherwise specified.) VIN 50mV/ div VIN 50mV/div Input Current 10mA/div VOUT 50mV/div AC coupled 400 nsec/div 400 nsec/div AC coupled Input Current 10mA/ div VOUT 50mV/ div Figure 15. Switching Waveforms in 1.5x Mode Figure 16. Operating Waveforms in 1x Mode EN 2V/div EN 2V/div Input Current 100mA/ div Input Current 100mA/div VOUT 2V/div 400 msec/div VOUT 2V/div 400 msec/div Figure 17. Power Up 6 LEDs at 15 mA, VIN = 3 V (1.5x Mode) 100 Vin 3.6V to 4.9V 1V/div Input Current 5mA/div VOUT 2V/div AC coupled Figure 18. Power Up 6 LEDs at 15 mA, VIN = 3.6 V (1x Mode) LED CURRENT (mA) 10 1 0.1 10 100 RSET (kW) 1000 10,000 200 msec/div Figure 19. LED Current vs. RSET Figure 20. Line Transient Response in 1x Mode http://onsemi.com 8 CAT3606 TYPICAL CHARACTERISTICS (VIN = 3.6 V, EN = VIN, ENM = ENS = GND, CIN = COUT = 1 mF, TAMB = 25°C, unless otherwise specified.) 5 4 1x Mode 3 2 1 0 1.24 RSET PIN VOLTAGE (V) OUTPUT VOLTAGE (V) 1.22 1.20 1.18 0 100 200 300 400 500 1.16 −50 −25 0 25 50 75 100 125 OUTPUT CURRENT (mA) TEMPERATURE (°C) Figure 21. Foldback Current Limiting Figure 22. RSET Pin Voltage vs. Temperature ENM & ENS 5V/div VOUT 1V/div Tot. LED Current 50mA/div 200 msec/div Figure 23. PWM Dimming at 1 kHz on ENM and ENS Recommended Layout When the driver is in the 1.5x charge pump mode, the 1 MHz 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 24. 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 24. PCB Layout http://onsemi.com 9 CAT3606 PACKAGE DIMENSIONS TQFN16, 4x4 CASE 510AE−01 ISSUE A D A DETAIL A E E2 PIN#1 ID D2 BOTTOM VIEW PIN#1 INDEX AREA TOP VIEW A1 SIDE VIEW SYMBOL A A1 A3 b D D2 E E2 e L MIN 0.70 0.00 0.25 3.90 2.00 3.90 2.00 0.45 NOM 0.75 0.02 0.20 REF 0.30 4.00 −−− 4.00 −−− 0.65 BSC −−− MAX 0.80 0.05 0.35 4.10 2.25 4.10 2.25 0.65 A L DETAIL A b e Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-220. A1 FRONT VIEW A3 http://onsemi.com 10 CAT3606 Example of Ordering Information (Note 7) Prefix CAT Device # 3606 Suffix HV4 −G T2 Company ID (Optional) Product Number 3606 Package HV4: TQFN 4 x 4 mm Lead Finish G: NiPdAu Blank: Matte−Tin (Note 8) Tape & Reel (Note 9) T: Tape & Reel 2: 2,000 / Reel 5. 6. 7. 8. 9. All packages are RoHS−compliant (Lead−free, Halogen−free). The standard lead finish is NiPdAu. The device used in the above example is a CAT3606HV4−GT2 (TQFN, NiPdAu Plated Finish, Tape & Reel, 2,000/Reel). For Matte−Tin package option, please contact your nearest ON Semiconductor Sales office. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/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. 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