CAT4002A, CAT4004A Constant Current LED Driver with 32 Dimming Levels and Rset Description The CAT4002A and CAT4004A provide respectively two and four matched low dropout current sources to drive LEDs. The CAT400XA uses an external resistor RSET to set 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 setting the LED channel current with 32 linear dimming levels. LEDs can be powered directly from a Lithium−ion battery due to the low dropout (50 mV at 20 mA) current sinks. The device is available in the tiny 8−pad UDFN 2 mm x 2 mm package with a max height of 0.55 mm, as well as the 6−lead TSOT−23 and SC−70. http://onsemi.com UDFN−8 HU2G SUFFIX CASE 517AW SC70−6 SD SUFFIX CASE 419AD Features • • • • • • • • • • 2 and 4 LED Current Sinks with Tight Matching 32 Dimming Levels Low Dropout Driver 50 mV at 20 mA No Switching Noise Shutdown Current less than 1 mA LED Current set by External Resistor Dimming via 1−wire EZDimt Interface Thermal Shutdown Protection 6−lead TSOT−23, SC−70, and 8−pad UDFN 2 mm x 2 mm Packages These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Applications • LCD Display Backlight • Cellular Phones • Digital Still Cameras • Handheld Devices PIN CONNECTIONS 1 20 mA CIN LED2 CAT4004A UDFN−8 1 EN/DIM LED1 GND RSET VIN LED2 CAT4002A TSOT23−6 EN/DIM 1 mF LED1 LED2 LED3 LED4 VIN One wire programming EN/DIM LED1 RSET GND VIN LED2 (Top Views) GND ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet. Figure 1. Typical Application Circuit © Semiconductor Components Industries, LLC, 2011 June, 2011 − Rev. 2 1 CAT4002A SC70−6 CAT4004A RSET RSET 3.74 kW VIN RSET LED4 LED3 EN/DIM GND LED1 VIN 2.4 V to 5.5 V TSOT23−6 TD SUFFIX CASE 419AF 1 Publication Order Number: CAT4002A/D CAT4002A, CAT4004A MARKING DIAGRAMS BG A Y M BGA YM VLYM VJA UDFN8 (2 x 2 mm) TSOT23−6 SC70−6 = CAT4004A Device Code = Assembly Location Code = Production Year (last digit) = Production Month: 1 − 9, A, B, C VL Y M = CAT4002A Device Code = Production Year (last digit) = Production Month: 1 − 9, A, B, C VJ A = CAT4002A Device Code = Assembly Location Code Table 1. ABSOLUTE MAXIMUM RATINGS Parameter VIN, LEDx, RSET EN/DIM Voltage Rating Unit 6 V 6 V Storage Temperature Range −65 to +160 °C Junction Temperature Range −40 to +125 °C 300 °C 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. ELECTRICAL OPERATING CHARACTERISTICS (Min and Max values are over recommended operating conditions unless specified otherwise. Typical values are at VIN = 4.0 V, EN/DIM = High, and TAMB = 25°C.) Symbol Name Conditions IQ Quiescent Current No load, RSET = Float No load, RSET = 4.8 kW IQSHDN Shutdown Current VEN/DIM = 0 V ILED LED Current Setting ILED−ACC LED Current Accuracy ILED−DEV LED Channel Matching (Note 1) Min Typ 25 RSET = 4.99 kW 15 1 mA ≤ ILED ≤ 40 mA Units mA 1 RSET = 3.0 kW I LED * I LEDAVG Max 0.2 0.5 mA mA % ±1 −5 ±1 +5 % 0.57 0.6 0.63 V I LEDAVG VRSET RSET pin regulated voltage VDOUT Dropout Voltage (90% of nominal LED current) REN/DIM VHI VLO ILED = 20 mA ILED = 1 mA EN/DIM Pin − Internal pull−down resistor − Logic High Level − Logic Low Level 50 25 mV 200 kW V V 1.3 0.4 TSD Thermal Shutdown 150 °C THYS Thermal Hysteresis 20 °C VUVLO Undervoltage lockout (UVLO) threshold 2.0 V 1. For CAT4004A, ILEDAVG = (ILED,CH1 + ILED,CH2 + ILED,CH3 + ILED,CH4) / 4 For CAT4002A, ILEDAVG = (ILED,CH1 + ILED,CH2) / 2 http://onsemi.com 2 CAT4002A, CAT4004A Table 3. 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 4. RECOMMENDED EN/DIM TIMING (For 2.4 V ≤ VIN ≤ 5.5 V, over full ambient temperature range −40°C to +85°C.) Symbol Name Conditions Min TLO EN/DIM program low time 0.2 THI EN/DIM program high time 0.2 TLED TPWRDWN Typ Max Units 100 ms ms LED current settling time 10 EN/DIM low time to shutdown 3 ms 5 THI EN/DIM TLO TPWRDWN TLED 100% LED Current 100% 97% 94% 32 Levels Shutdown 3% Shutdown 0% Figure 2. CAT400XA EN/DIM Dimming Timing Diagram LED Current Setting Table 5. RSET RESISTOR AND LED CURRENT On the CAT400XA, the full scale LED current is set by the external resistor connected between the RSET pin and ground. Table 5 lists standard resistor values for several LED current settings. When the EN/DIM is initially taken high, the CAT400XA becomes enabled and the LED channel current is set to the full scale current according to the resistor RSET. LED current ≅ 125 x VRSET / RSET Full Scale LED Current [mA] RSET [kW] 2 40.2 5 15.4 10 7.68 15 4.99 20 3.74 25 3.00 30 2.49 40 1.87 http://onsemi.com 3 ms CAT4002A, CAT4004A TYPICAL PERFORMANCE CHARACTERISTICS (CAT4002A, VIN = 4 V, VF = 3.3 V, IOUT = 50 mA (2 LEDs at 25 mA), CIN = 1 mF, TAMB = 25°C unless otherwise specified.) QUIESCENT CURRENT (mA) 1.6 1.2 0.8 0.4 0 LED CURRENT CHANGE (%) 1.4 0 20 40 1.0 0.8 3.5 4.0 4.5 5.0 5.5 Figure 3. Quiescent Current vs. RSET Input Voltage Figure 4. Quiescent Current vs. Input Voltage (Full Load) 1.0 10 8 0.6 0.4 0.2 0 −0.2 −0.4 −0.6 2.5 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 120 40 25°C 1.0 0.8 LED CURRENT (mA) 1.2 −40°C 80°C 0.6 0.4 3.0 INPUT VOLTAGE (V) 0.8 −0.8 −1.0 2.5 RSET (kW) 1.4 ENABLE HIGH THRESHOLD (V) 1.2 0.6 60 LED CURRENT CHANGE (%) QUIESCENT CURRENT (mA) 2.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 30 20 10 0 5.5 1 10 INPUT VOLTAGE (V) RSET (kW) Figure 7. EN/DIM High Threshold vs. Input Voltage Figure 8. LED Current vs. RSET Resistor http://onsemi.com 4 100 CAT4002A, CAT4004A TYPICAL PERFORMANCE CHARACTERISTICS (CAT4002A, VIN = 4 V, VF = 3.3 V, IOUT = 50 mA (2 LEDs at 25 mA), CIN = 1 mF, TAMB = 25°C unless otherwise specified.) 30 100 25 mA 90 EFFICIENCY (%) LED CURRENT (mA) 25 20 15 10 70 60 5 0 80 1 mA 0 50 100 150 200 250 50 300 5.5 5.0 4.5 4.0 3.5 3.0 2.5 LED PIN VOLTAGE (mV) INPUT VOLTAGE (V) Figure 9. Dropout Characteristics Figure 10. Efficiency vs. Input Voltage Figure 11. Power Up Waveform Figure 12. Power Down Waveform Figure 13. Line Transient Waveform Figure 14. Dimming Levels http://onsemi.com 5 2.0 CAT4002A, CAT4004A Table 6. PIN DESCRIPTIONS Name EN/DIM Function Device enable (active high) and dimming control GND Ground reference LED1 LED1 cathode terminal LED2 LED2 cathode terminal LED3 LED3 cathode terminal (CAT4004A only) LED4 LED4 cathode terminal (CAT4004A only) RSET Connect external RSET resistor to set the LED current VIN Device supply input, connect to battery or supply TAB Connect to GND on the PCB (CAT4004A only) Pin Function 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, the RSET input becomes high impedance. GND is the ground reference for the device. The pin must be connected to the ground plane on the PCB. TAB (CAT4004A only) 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. VIN is the supply pin for the charge pump. 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 (2.0 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 CAT400XA becomes enabled and the LED channel current is 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 3 ms typical. Block Diagram LED4 LED3 Undervoltage Lockout LED2 VIN LED1 VIN Reference Voltage RSET EN/DIM Current Setting DAC Serial Interface Register 4 Current Sink Regulators 100 kW GND Figure 15. CAT4004A Functional Block Diagram http://onsemi.com 6 CAT4002A, CAT4004A Basic Operation Table 7. DIMMING LEVELS The CAT400XA uses tightly matched current sinks to accurately regulate LED current in each channel proportional to the current sourced from the RSET pin. There are 32 different settings for LED brightness that can be programmed through the EN/DIM pin. 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 50 mV headroom to sink a constant regulated current of 20 mA. If the input supply falls below 2.0 V typical, the under−voltage lockout circuit disables all LED channels and resets the circuit to default values. Any unused LED channels should be left open. Full Scale (Current in %) Dimming Pulses [n] 100 0 97 1 94 2 90 3 87 4 84 5 81 6 77 7 74 8 LED Current Selection 0.6 V R SET 10 11 61 12 58 13 55 14 52 15 48 16 45 17 42 18 39 19 35 20 32 21 29 22 26 23 23 24 19 25 16 26 13 27 10 28 6 29 3 30 0 31 100 32 ǒ3131* nǓ The full scale current is calculated from the above formula with n equal to zero. The EN/DIM pin has two primary functions. One function enables and disables the device. The other function is LED current dimming with 32 different levels by pulsing the input signal, as shown on Figure 16. On each consecutive pulse rising edge, the LED current is decreased by about 3.2% (1/31th of the full scale value). After 30 pulses, the LED current is 3.2% of the full scale current. On the 31st pulse, the current drops to zero, and then goes back to full scale on the following pulse. Each pulse width should be between 200 ns and 100 ms. Pulses faster than the minimum TLO may be ignored and filtered by the device. Pulses longer than the maximum TLO may shutdown the device. By pulsing the EN/DIM signal at high frequency, the LED current can quickly be set to zero. The LED driver enters a “zero current” shutdown mode if EN/DIM is held low for 3 ms typical. The dimming level is set by the number of pulses on the EN/DIM after the power−up, as shown in Table 7. 9 68 65 After power−up, the LED current is set by the external resistor (RSET) value and the number of pulses (n) on the EN/DIM input as follows: LED current + 125 71 THI EN/DIM TLO TPWRDWN TLED 100% LED Current Shutdown 100% 97% 94% 32 Levels 3% 0% Figure 16. EN/DIM Digital Dimming Timing Diagram http://onsemi.com 7 Shutdown CAT4002A, CAT4004A PACKAGE DIMENSIONS UDFN8, 2x2 CASE 517AW−01 ISSUE O D A D2 DETAIL A E E2 PIN #1 IDENTIFICATION A1 PIN #1 INDEX AREA TOP VIEW SIDE VIEW SYMBOL MIN NOM MAX A 0.45 0.50 0.55 A1 0.00 0.02 0.05 b 0.18 0.25 0.30 D 1.90 2.00 2.10 D2 1.50 1.60 1.70 E 1.90 2.00 2.10 E2 0.80 0.90 1.00 e L BOTTOM VIEW b L e 0.50 BSC 0.20 0.30 DETAIL A 0.45 Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-229. http://onsemi.com 8 CAT4002A, CAT4004A PACKAGE DIMENSIONS SC−70, 6 Lead, 1.25x2 CASE 419AD−01 ISSUE O D e e E1 E SYMBOL MIN A 0.80 MAX 1.10 A1 0.00 0.10 A2 0.80 1.00 b 0.15 0.30 c 0.10 0.18 D 1.80 2.00 2.20 E 1.80 2.10 2.40 E1 1.15 1.25 1.35 e L 0.65 BSC 0.26 0.36 0.46 0.42 REF L1 L2 TOP VIEW NOM 0.15 BSC θ 0º 8º θ1 4º 10º q1 A2 A q q1 b L L1 A1 SIDE VIEW c END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-203. http://onsemi.com 9 L2 CAT4002A, CAT4004A PACKAGE DIMENSIONS TSOT−23, 6 LEAD CASE 419AF−01 ISSUE O SYMBOL D MIN NOM A e E1 MAX 1.00 A1 0.01 0.05 0.10 A2 0.80 0.87 0.90 b 0.30 c 0.12 0.45 0.15 D 2.90 BSC E 2.80 BSC E1 1.60 BSC E e 0.20 0.95 TYP L 0.30 0.40 L1 0.60 REF L2 0.25 BSC 0º θ 0.50 8º TOP VIEW A2 A b q L A1 c L1 SIDE VIEW END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-193. http://onsemi.com 10 L2 CAT4002A, CAT4004A Example of Ordering Information (Note 4) Prefix Device # Suffix CAT 4004A HU2 −G T3 Package Lead Finish G: NiPdAu Tape & Reel (Note 6) T: Tape & Reel 3: 3,000 Units / Reel Company ID (Optional) Product Number 4002A 4004A HU2: UDFN TD: TSOT SD: SC70 Table 8. ORDERING INFORMATION Part Number Package Quantity per Reel CAT4002ASD−GT3 SC70−6 3,000 CAT4002ATD−GT3 TSOT−23 3,000 UDFN−8 (2 x 2 mm) 3,000 CAT4004AHU2−GT3 2. 3. 4. 5. 6. All packages are RoHS−compliant (Lead−free, Halogen−free). The standard lead finish is NiPdAu. The device used in the above example is a CAT4004AHU2−GT3 (UDFN, NiPdAu, Tape & Reel, 3,000/Reel). For additional package and temperature options, 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 11 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative CAT4002A/D