CAT4002BTD-GT3

CAT4002B, CAT4003B, CAT4004B Constant Current Programmable LED Driver with 32 Dimming Levels http://onsemi.com Description The CAT4002B, CAT4003B and CAT4004B provide respectively two, three and four matched low dropout current sources to drive LEDs. The CAT400XB requires no external RSET resistor. The LED current is internally set to 25 mA when the device is first enabled. 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 input supports the 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 (75 mV at 20 mA) current sinks. Package options are available in the 4−channel tiny 8−pad UDFN 2 mm x 2 mm with a max height of 0.55 mm, and 2 or 3− channel in the 6−lead TSOT−23 and SC−70. Features • • • • • • • • • • UDFN−8 HU2 SUFFIX CASE 517AW TSOT23−6 TD SUFFIX CASE 419AF SC70−6 SD SUFFIX CASE 419AD TYPICAL APPLICATION CIRCUIT VIN 2, 3, 4 LED Current Sinks with Tight Matching 32 Dimming Levels Low Dropout Driver 75 mV at 20 mA No Switching Noise Shutdown Current less than 1 mA 25 mA Max LED Current per Channel Dimming via 1−wire EZDimt Interface Thermal Shutdown Protection RoHS Compliant 6−lead TSOT−23, SC−70, and 8−pad UDFN 2 mm x 2 mm Packages 2.4 V to 5.5 V CIN 1 mF LED1 LED2 VIN CAT4002B One Wire Programming 32 Steps EN/DIM GND Typical Applications • LCD Display Backlight • Cellular Phones • Digital Still Cameras © Semiconductor Components Industries, LLC, 2011 June, 2011 − Rev. 4 ORDERING INFORMATION See detailed ordering information on page 2 of this data sheet. 1 Publication Order Number: CAT4002B/D CAT4002B, CAT4003B, CAT4004B MARKING DIAGRAMS BH A Y M BHA YM VKYM VHA UDFN8 (2 x 2 mm) TSOT23−6L SC70−6L KLYM KLA TSOT23−6L SC70−6L = CAT4004B Device Code = Assembly Location Code = Production Year (last digit) = Production Month: 1 − 9, O, N, D VK KL Y M = CAT4002B Device Code = CAT4003B Device Code = Production Year (last digit) = Production Month: 1 − 9, O, N, D VH = CAT4002B Device Code KL = CAT4003B Device Code A = Assembly Location Code ORDERING INFORMATION (Note 1) Package Finish Shipping (Note 2) CAT4002BTD−GT3 TSOT−23, 6−Lead NiPdAu (RoHS Compliant) 3,000 / Tape & Reel CAT4002BSD−GT3 SC−70, 6−Lead NiPdAu (RoHS Compliant) 3,000 / Tape & Reel CAT4003BTD−GT3 TSOT−23, 6−Lead NiPdAu (RoHS Compliant) 3,000 / Tape & Reel CAT4003BSD−GT3 SC−70, 6−Lead NiPdAu (RoHS Compliant) 3,000 / Tape & Reel UDFN, 8−Pad, 2 x 2 mm NiPdAu (RoHS Compliant) 3,000 / Tape & Reel Orderable Part Number CAT4004BHU2−GT3 1. For additional package and temperature options, please contact your nearest ON Semiconductor Sales office. 2. 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. http://onsemi.com 2 CAT4002B, CAT4003B, CAT4004B PIN CONNECTIONS (Top View) 1 1 EN/DIM GND LED1 LED2 VIN NC LED4 LED3 EN/DIM LED1 LED1 GND LED2 GND VIN LED3 EN/DIM CAT4004B UDFN8 2 x 2 mm 1 LED3 VIN CAT4003B SC70−6L CAT4003B TSOT23−6L 1 EN/DIM GND 1 LED1 LED1 NC GND NC EN/DIM VIN LED2 VIN LED2 LED2 CAT4002B SC70−6L CAT4002B TSOT23−6L Table 1. PIN FUNCTIONS Pin Name Function EN/DIM Device Enable (active high) and Dimming Control GND Ground Reference LED1 LED1 Cathode Terminal LED2 LED2 Cathode Terminal LED3 LED3 Cathode Terminal LED4 LED4 Cathode Terminal VIN Device Supply Input, Connect to Battery or Supply TAB Connect to GND on the PCB, for CAT4004B only. Table 2. ABSOLUTE MAXIMUM RATINGS Parameter Value Unit 6 V VIN + 0.7 V Storage Temperature Range −65 to +160 °C Junction Temperature Range −40 to +125 °C 300 °C VIN, LEDx Voltage 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 3. RECOMMENDED OPERATING CONDITIONS Parameter Value Unit VIN 2.4 to 5.5 V Ambient Temperature Range −40 to +85 °C 0 to 25 mA LED Current Range 3. Typical application circuit with external components is shown on page 1. http://onsemi.com 3 CAT4002B, CAT4003B, CAT4004B Table 4. ELECTRICAL OPERATING CHARACTERISTICS (over recommended operating conditions unless specified otherwise) (VIN = 4.0 V, EN = High, TAMB = 25°C) Parameter Conditions Symbol Min Typ Max Units Quiescent Current ILED = 25 mA/channel IQ 0.5 0.7 1.5 mA Shutdown Current VEN = 0 V IQSHDN 1 mA Full Scale LED Current (Average) (Note 4) ILED−FULL 24 25 26 mA LED Channel Matching I LED * I LEDAVG I LEDAVG ILED−DEV −5 ±1 +5 % ILED = 20 mA ILED = 1 mA VDOUT Dropout Voltage EN/DIM Pin − Internal pull−down resistor − Logic High Level − Logic Low Level REN/DIM VHI VLO 75 45 mV 200 kW V V 1.3 0.4 Thermal Shutdown TSD 150 °C Thermal Hysteresis THYS 20 °C Undervoltage lockout (UVLO) threshold VUVLO 2.0 V 4. For the CAT4004B, ILEDAVG = (ILED,CH1 + ILED,CH2 + ILED,CH3 + ILED,CH4) / 4 For the CAT4003B, ILEDAVG = (ILED,CH1 + ILED,CH2 + ILED,CH3) / 3 For the CAT4002B, ILEDAVG = (ILED,CH1 + ILED,CH2) / 2 5. The standard lead finish is NiPdAu. Table 5. RECOMMENDED EN/DIM TIMING (For 2.4 V ≤ VIN ≤ 5.5 V, over full ambient temperature range −40°C to +85°C.) Parameter Conditions Symbol Min EN/DIM program low time TLO 0.2 EN/DIM program high time THI 0.2 LED current settling time TLED EN/DIM low time to shutdown Typ Max Units 100 ms ms 10 TPWRDWN 2 3 ms 5 ms THI EN/DIM TLO TPWRDWN TLED 100% LED Current 100% 97% 94% 32 Levels Shutdown 3% 0% Shutdown Figure 1. CAT400XB EN/DIM Dimming Timing Diagram LED Current Setting On the CAT400XB, the full scale LED current is internally set to 25 mA (no external resistor). When the EN/DIM is first enabled, the CAT400XB sets the LED channel current to the full scale current. Each consecutive rising edge on the EN/DIM decreases the LED current by one step until it goes to zero, as shown on Figure 1. http://onsemi.com 4 CAT4002B, CAT4003B, CAT4004B TYPICAL CHARACTERISTICS (CAT4003B, VIN = 4 V, VF = 3.3 V, IOUT = 75 mA (3 LEDs at 25 mA), CIN = 1 μF, TAMB = 25°C unless otherwise specified.) 1.4 −40°C 1.2 QUIESCENT CURRENT [mA] ENABLE HIGH THRESHOLD [V] 1.4 25°C 1.0 0.8 0.6 80°C 0.4 1.2 1.0 0.8 0.6 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 1.0 10 0.8 8 0.6 0.4 0.2 0.0 −0.2 −0.4 −0.6 3.5 4.0 4.5 4.5 5.0 5.5 Figure 3. Quiescent Current vs. Input Voltage (full load) LED CURRENT CHANGE [%] LED CURRENT CHANGE [%] Figure 2. EN High Threshold vs. Input Voltage 2.5 3.0 4.0 INPUT VOLTAGE [V] INPUT VOLTAGE [V] −0.8 −1.0 3.5 5.0 5.5 6 4 2 0 −2 −4 −6 −8 −10 −40 INPUT VOLTAGE [V] 0 40 80 120 TEMPERATURE [°C] Figure 4. LED Current Change vs. Input Voltage Figure 5. LED Current Change vs. Temperature http://onsemi.com 5 CAT4002B, CAT4003B, CAT4004B TYPICAL CHARACTERISTICS (CAT4003B, VIN = 4 V, VF = 3.3 V, IOUT = 75 mA (3 LEDs at 25 mA), CIN = 1 μF, TAMB = 25°C unless otherwise specified.) 30 100 25mA 90 20 EFFICIENCY [%] LED CURRENT [mA] 25 15 10 5 0 0.8mA 0 50 100 150 200 250 80 70 60 50 300 LED PIN VOLTAGE [mV] 3.0 3.5 4.0 4.5 5.0 INPUT VOLTAGE [V] Figure 6. Dropout Characteristics Figure 7. Efficiency vs. Input Voltage Figure 8. Power Up Waveform Figure 9. Power Down Waveform Figure 10. Line Transient Waveform Figure 11. Dimming Levels http://onsemi.com 6 CAT4002B, CAT4003B, CAT4004B Pin Functions into “zero current” shutdown mode, the EN/DIM pin must be held low for 3 ms typical LED1 to LED4 provide the internal regulated current for each of the LED cathodes. The pins enter a high impedance zero current state whenever the device is placed in shutdown mode. GND is the ground reference for the device. The pin must be connected to the ground plane on the PCB. TAB (CAT4004B 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 2.4 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 CAT400XB becomes enabled and all LED currents are set to the full scale 25 mA. To place the device LED4 LED3 Undervoltage Lockout VIN LED2 LED1 VIN Reference Voltage Current Setting DAC EN/DIM Serial Interface 4 Current Sink Regulators Register 200 kΩ GND Figure 12. CAT4004B Functional Block Diagram Basic Operation 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 13. 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 6. The CAT400XB uses tightly matched current sinks to accurately regulate LED current in each channel. 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 75 mV headroom to sink a constant regulated current of 20 mA. If the input supply falls below 2.0 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. CAT400XB LED Current Selection After power−up and once enabled, the LED current is set initially to the full scale currrent of 25 mA. The number of pulses (n) on the EN/DIM input does decrease the current value as follows: LED current [mA] + 25 ǒ3131* nǓ http://onsemi.com 7 CAT4002B, CAT4003B, CAT4004B Table 6. DIMMING LEVELS Full Scale Current in % Dimming Pulses [n] Full Scale Current in % Dimming Pulses [n] 48 16 100 0 45 17 97 1 42 18 94 2 39 19 90 3 35 20 87 4 32 21 84 5 29 22 81 6 26 23 77 7 23 24 74 8 19 25 71 9 16 26 68 10 13 27 65 11 10 28 61 12 6 29 58 13 3 30 55 14 0 31 52 15 100 32 THI EN/DIM TLO TPWRDWN TLED 100% LED Current Shutdown 100% 97% 94% 32 Levels 3% 0% Figure 13. EN/DIM Digital Dimming Timing Diagram http://onsemi.com 8 Shutdown CAT4002B, CAT4003B, CAT4004B 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 9 CAT4002B, CAT4003B, CAT4004B 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 10 L2 CAT4002B, CAT4003B, CAT4004B 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 L2 L1 SIDE VIEW END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-193. 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. 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