CAT4004 4-Channel Constant Current LED Driver with EZDimt Description The CAT4004 provides four matched low dropout current sources to drive LEDs. An external resistor on RSET sets the current in the LED channels. Each LED channel includes an individual control loop allowing the device to handle a wide range of LED forward voltages while still maintaining tight current matching. The EN/DIM logic inputs supports device enable and a digital dimming interface for current setting of all LEDs. Six different current dimming ratios are available. The device is aimed at “direct drive” battery applications. It is required that the battery or voltage source have enough headroom to drive the LED forward voltage and current sink (>150 mV). The device is available in a tiny 8−lead TDFN 2 mm x 3 mm package with a max height of 0.8 mm. Features • • • • • • • • • Four LED Current Sinks with Tight Matching Low Dropout Driver 130 mV at 30 mA No Switching Noise Shutdown Current < 1 mA LED Current set by External Resistor Dimming via 1−wire EZDimt Interface Thermal Shutdown Protection 8−lead 2 mm x 3 mm TDFN Package These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Applications • • • • LCD Display Backlight Cellular Phones Digital Still Cameras Handheld Devices TDFN−8 VP2 SUFFIX CASE 511AK PIN CONNECTIONS EN/DIM GND 20 mA CIN LED1 LED2 LED3 LED4 VIN One wire programming EN/DIM VIN RSET LED4 LED1 LED2 LED3 (Top View) MARKING DIAGRAMS FXA XXX YM HAA XXX YM FX = CAT4004VP2−T3 HA = CAT4004VP2−GT3 A = Assembly Location XXX = Last Three Digits of Assembly Lot Number Y = Production Year (Last Digit) M = Production Month (1−9, A, B, C) Device 1 mF 1 ORDERING INFORMATION VIN 2.4 V to 5.5 V http://onsemi.com Package Shipping CAT4004VP2−T3 (Note 1) TDFN−8 (Pb−Free) 3,000/ Tape & Reel CAT4004VP2−GT3 (Note 2) TDFN−8 (Pb−Free) 3,000/ Tape & Reel 1. Matte−Tin Plated Finish (RoHS−compliant). 2. NiPdAu Plated Finish (RoHS−compliant). CAT4004 RSET RSET 3.8 kW GND Figure 1. Typical Application Circuit © Semiconductor Components Industries, LLC, 2010 March, 2010 − Rev. 2 1 Publication Order Number: CAT4004/D CAT4004 Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit 6 V VIN + 0.7 V Storage Temperature Range −65 to +160 °C Junction Temperature Range −40 to +150 °C 300 °C VIN, LEDx, RSET EN/DIM Voltage Lead Temperature 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. Table 2. RECOMMENDED OPERATING CONDITIONS Parameter Rating Unit VIN 2.4 to 5.5 V Ambient Temperature Range −40 to +85 °C 0 to 40 mA ILED per LED pin NOTE: Typical application circuit with external components is shown on page 1. Table 3. ELECTRICAL OPERATING CHARACTERISTICS (over recommended operating conditions unless specified otherwise) VIN = 4.0 V, EN = High, TAMB = 25°C Name Symbol IQ Quiescent Current IQSHDN Shutdown Current Conditions Min No load, RSET = Float No load, RSET = 4.8 kW Typ 0.6 1.0 VEN = 0 V ILED−ACC LED Current Accuracy 1 mA ≤ ILED ≤ 40 mA ILED−DEV LED Channel Matching I LED * I LEDAVG Max mA 1 ±1 mA % ±1 −5 Units +5 % I LED VDOUT REN/DIM VHI VLO Dropout Voltage ILED = 30 mA EN/DIM Pin − Internal pull−down resistor − Logic High Level − Logic Low Level 130 mV 100 kW V V 1.3 0.4 TSD Thermal Shutdown 150 °C THYS Thermal Hysteresis 20 °C VUVLO Undervoltage lockout (UVLO) threshold 1.8 V http://onsemi.com 2 CAT4004 Table 4. RECOMMENDED EN/DIM TIMING (For 2.4 ≤ VIN ≤ 5.5 V, over full ambient temperature range −40°C to +85°C.) Name Symbol TSETUP Conditions Min Typ Max Units EN/DIM setup from shutdown 10 TLO EN/DIM program low time 0.2 THI EN/DIM program high time 0.2 ms EN/DIM low time to shutdown 1.5 ms TPWRDWN TLED LED current settling time ms 100 ms 40 TSETUP ms TPWRDWN THI EN/DIM TLED TLO 100% 100% 50% LED Current 25% Shutdown 12.5% 6.25% 3.12% Shutdown Figure 2. EN/DIM Dimming Timing Diagram EN/DIM Number of Pulses (Note 3) RSET Gain LED Current LOW Shutdown mode Zero Transitions HIGH 132 132 x 0.6 V/RSET 1st 66 66 x 0.6 V/RSET 2nd 33 33 x 0.6 V/RSET 3rd 16.5 16.5 x 0.6 V/RSET 4th 8.25 8.25 x 0.6 V/RSET 5th 4.125 4.125 x 0.6 V/RSET 6th 132 132 x 0.6 V/RSET xth Device will keep cycling through gain selection GAIN x 0.6 V/RSET 3. The gain is changed on the rising edges of the EN/DIM input. LED Current Selection At power−up, the initial LED current is set to full scale (100% brightness) by the external resistor RSET as follows: LED current + 132 input signal, as shown on Figure 2. On each consecutive pulse rising edge, the LED current is divided by half to 50%, then 25%, 12.5%, 6.25% and 3.125% dimming levels. Pulses faster than the minimum TLO may be ignored and filtered by the device. Pulses longer than the maximum TLO may shutdown the device. The LED driver enters a “zero current” shutdown mode if EN/DIM is held low for 1.5 ms or more. 0.6 V R SET The EN/DIM pin has two primary functions. One function enables and disables the device. The other function is LED current dimming with six different levels by pulsing the http://onsemi.com 3 CAT4004 TYPICAL PERFORMANCE CHARACTERISTICS (VIN = 4 V, VF = 3.3 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = 1 mF, TAMB = 25°C unless otherwise specified.) 1.4 1.0 0.8 0.6 2.5 3.0 3.5 4.0 4.5 5.0 1.2 1.0 0.8 0.6 5.5 0 40 80 120 TEMPERATURE (°C) Figure 3. Quiescent Current vs. Input Voltage Figure 4. Quiescent Current vs. Temperature 1.0 10 0.8 8 0.6 0.4 0.2 0 −0.2 −0.4 −0.6 −0.8 −1.0 −40 INPUT VOLTAGE (V) LED CURRENT CHANGE (%) LED CURRENT CHANGE (%) QUIESCENT CURRENT (mA) 1.2 3.0 3.5 4.0 4.5 5.0 5.5 6 4 2 0 −2 −4 −6 −8 −10 −40 0 40 80 INPUT VOLTAGE (V) TEMPERATURE (°C) Figure 5. LED Current Change vs. Input Voltage Figure 6. LED Current Change vs. Temperature 40 LED CURRENT (mA) QUIESCENT CURRENT (mA) 1.4 30 20 10 0 0 5 10 15 RSET (kW) Figure 7. LED Current vs. RSET Resistor http://onsemi.com 4 20 120 CAT4004 TYPICAL PERFORMANCE CHARACTERISTICS 0.7 0.7 0.6 0.6 RSET VOLTAGE (V) RSET VOLTAGE (V) (VIN = 4 V, VF = 3.3 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = 1 mF, TAMB = 25°C unless otherwise specified.) 0.5 0.4 0.3 0.4 0.3 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0.2 −40 5.5 80 120 Figure 8. RSET Pin Voltage vs. Input Voltage Figure 9. RSET Pin Voltage vs. Temperature 30 30 LED CURRENT (mA) 40 20 10 0 40 TEMPERATURE (°C) 40 0 0 INPUT VOLTAGE (V) 0.5 1.0 1.5 2.0 2.5 3.0 20 10 0 3.5 0 50 100 150 200 250 LED PIN VOLTAGE (V) LED PIN VOLTAGE (mV) Figure 10. LED Current vs. LED Pin Voltage Figure 11. Dropout Characteristics 100 90 EFFICIENCY (%) LED CURRENT (mA) 0.2 0.5 80 70 60 50 5.0 4.5 4.0 3.5 3.0 2.5 INPUT VOLTAGE (V) Figure 12. Efficiency vs. Input Voltage http://onsemi.com 5 2.0 300 CAT4004 TYPICAL PERFORMANCE CHARACTERISTICS (VIN = 4 V, VF = 3.3 V, IOUT = 80 mA (4 LEDs at 20 mA), CIN = 1 mF, TAMB = 25°C unless otherwise specified.) Figure 13. Power Up Waveform Figure 14. Power Down Waveform Figure 15. Line Transient Waveform 4 V to 5.5 V Figure 16. Dimming Waveform 80 mA to 40 mA http://onsemi.com 6 CAT4004 Table 5. PIN DESCRIPTIONS Pin # Name Function 1 EN/DIM 2 GND Ground reference 3 LED1 LED1 cathode terminal 4 LED2 LED2 cathode terminal 5 LED3 LED3 cathode terminal 6 LED4 LED4 cathode terminal 7 RSET RSET external LED mirror gain 128 8 VIN Device supply input, connect to battery or supply TAB TAB Connect to GND on the PCB Device enable (active high) and dimming control Pin Function VIN is the supply pin for the device logic. A small 1 mF ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is from 2.5 V to 5.5 V. Whenever the input supply falls below the under−voltage threshold (1.8 V), all the LED channels are disabled and the device enters shutdown mode. EN/DIM is the enable and one wire dimming input for all LED channels. Levels of logic high and logic low are set at 1.3 V and 0.4 V respectively. When EN/DIM is initially taken high, the device becomes enabled and all LED currents are set to the full scale according to the resistor RSET. To place the device into “zero current” shutdown mode, the EN/DIM pin must be held low for at least 1.5 ms. LED1 to LED4 provide the internal regulated current for each of the LED cathodes. There pins enter a high impedance zero current state whenver the device is placed in shutdown mode. RSET is connected to the resistor (RSET) to set the full scale current for the LEDs. The voltage at this pin is regulated to 0.6 V. The ground side of the external resistor should be star connected back to the GND of the PCB. In shutdown mode, RSET beomes high impedance. GND is the ground reference for the device. The pin must be connected to the ground plane on the PCB. TAB is the exposed pad underneath the package. For best thermal performance, the tab should be soldered to the PCB and connected to the ground plane. http://onsemi.com 7 CAT4004 Block Diagram LED4 LED3 Undervoltage Lockout LED2 VIN LED1 VIN Reference Voltage RSET Current Setting DAC Serial Interface EN/DIM 4 Current Sink Regulators Register 100 kW GND Figure 17. CAT4004 Functional Block Diagram Basic Operation The CAT4004 uses four tightly matched current sinks to accurately regulate LED current in each channel proportional to the current sourced from the RSET pin. I LED + GAIN power−up is 132. Tight current regulation for all channels is possible over a wide range of input and LED voltages due to independent current sensing circuitry on each channel. Each LED channel needs a minimum of 150 mV headroom to sink constant regulated current. If the input supply falls below 1.8 V, the under−voltage lockout circuit disables all LED channels and resets the circuit to default values. Any unused LED channels should be left open. 0.6 V R SET There are six different gain settings for LED brightness that can be set through the EN/DIM pin. The default gain on http://onsemi.com 8 CAT4004 PACKAGE DIMENSIONS TDFN8, 2x3 CASE 511AK−01 ISSUE A D A e b E2 E PIN#1 IDENTIFICATION A1 PIN#1 INDEX AREA D2 TOP VIEW SYMBOL MIN SIDE VIEW NOM A 0.70 0.75 0.80 0.00 0.02 0.05 A2 0.45 0.55 0.65 A2 0.20 REF A3 b 0.20 0.25 0.30 D 1.90 2.00 2.10 D2 1.30 1.40 1.50 E 2.90 3.00 3.10 E2 1.20 1.30 1.40 e L BOTTOM VIEW MAX A1 A3 FRONT VIEW 0.50 TYP 0.20 0.30 L 0.40 Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-229. http://onsemi.com 9 CAT4004 Example of Ordering Information (Note 6) 4. 5. 6. 7. 8. Prefix Device # Suffix CAT 4004 VP2 −G T3 Company ID (Optional) Product Number 4004 Package VP2: TDFN 2 x 3 mm Lead Finish G: NiPdAu Blank: Matte−Tin (Note 7) Tape & Reel (Note 8) T: Tape & Reel 3: 3,000 / Reel All packages are RoHS−compliant (Lead−free, Halogen−free). The standard lead finish is NiPdAu. The device used in the above example is a CAT4004VP2−GT3 (TDFN, NiPdAu Plated Finish, Tape & Reel, 3,000/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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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: [email protected] 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 http://onsemi.com 10 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative CAT4004/D