Data Sheet 4-CH Linear Constant Current Sink With Matching General Description Features The AP2502 is a 4-channel independent linear current sink with low dropout voltage and perfect match between each channel. Each channel can provide 20mA continuous constant current. • • In application, there is only one 0.1µF ceramic capacitor required, and there is no any EMI and switching noise issue. It is perfect choice for hand-hold portable system especially based on Li-ion/Polymer battery powered display module. • • • • • • • AP2502 Current Matching Between Each Channel: ±1% Low Dropout Voltage: 65mV (Typ.) @ ILED= 20mA Maximum Output Current on Each Channel: 20mA Ultra-low Quiescent Current: 125µA (Typ.) Ultra-low Shutdown Current: 1µA (Max.) None EMI and Switching Noise Issue Permitted PWM Dimming Frequency up to 150kHz OTSD Protection The brightness can be controlled and/or adjustable via simple PWM signal applied to EN pin. Applications The AP2502 is available with SOT-23-6 and TSOT-23-6 packages. • • • SOT-23-6 Mobile Phone, Smart Phone, PDA MP3, MP4, PMP Small Size Backlight Module TSOT-23-6 Figure 1. Package Types of AP2502 Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited 1 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Pin Configuration K/KT Package (SOT-23-6/TSOT-23-6) Figure 2. Pin Configuration of AP2502 (Top View) Pin Descriptions P in Number Pin Name Description 1 EN Chip enable pin, active high to permit PWM signal input for brightness control by changing duty cycle 2 GND 3, 4, 5, 6 LED4 to LED1 Oct. 2010 GND LED cathode terminal for channel number Rev 1. 1 BCD Semiconductor Manufacturing Limited 2 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Functional Block Diagram Figure 3. Functional Block Diagram of AP2502 Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited 3 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Ordering Information AP2502 - Circuit Type G1: Green Package K: SOT-23-6 KT: TSOT-23-6 TR: Tape & Reel Package Temperature Range SOT-23-6 TSOT-23-6 -40 to 85°C -40 to 85°C Part Number AP2502KTR-G1 AP2502KTTR-G1 Marking ID GEE L7E Packing Type Tape & Reel Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and Green. Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Enable Input Voltage VEN -0.3 to 6.5 V Thermal Resistance (Junction to Ambient) θJA 250 ºC/W Operating Junction Temperature Range TJ 150 ºC Storage Temperature Range TSTG -65 to 150 ºC Lead Temperature (Soldering,10 seconds) TLEAD 260 ºC ESD (Machine Model) 600 V ESD (Human Body Model) 6000 V Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited 4 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Recommended Operating Conditions Parameter Symbol Value Min Max Unit Enable Input Voltage VEN 2.0 6.0 V Operating Temperature Range TA -40 85 °C Sink Current ILED 20 mA Electrical Characteristics VIN=3.6V, VF_LED=3.2V, TA = 25°C, unless otherwise specified. Parameter Symbol LED Dropout Voltage VDROPOUT Test Conditions Min Typ Max Unit 65 120 mV ISINK =20mA Enable PIN High Voltage VIH 2 6 V Enable PIN Low Voltage VIL 0 0.5 V 20 22 mA LED Maximum Current Sink Sink Current Matching Between each Channel ILED(MAX) VCC=3.3 to 6.0V, Enable=VCC ILED-MATCH VLED=0.4V 0.5 1 % ILED1=ILED2=ILED3=ILED4=20mA 125 180 µA Set EN Pin Low 0.1 1 µA Quiescent Current IQ Shutdown Current ISHUTDOWN Thermal Resistance (Junction to Case) PWM Frequency to Adjust Brightness 18 θJC °C/W 80 150 fPWM kHz EN Pin Pulse High Time THIGH 1 µs EN Pin Pulse Low Time TLOW 100 ns Thermal Temperature Thermal Hysteresis Oct. 2010 Shutdown Shutdown TOTSD 150 THYOTSD 25 Rev 1. 1 °C BCD Semiconductor Manufacturing Limited 5 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Typical Performance Characteristics 200 200 190 180 170 160 150 140 130 120 110 100 90 80 o 160 TC=25 C 150 o TC=85 C 140 130 120 110 100 90 80 70 70 60 50 -40 LED Open o TC=-40 C 180 Quiescent Current (µA) Quiescent Current (µA) 170 190 LED Open VEN=3V 60 -20 0 20 40 60 80 100 120 140 1 2 3 o Figure 4. Quiescent Current vs. Case Temperature 5 6 7 Figure 5. Quiescent Current vs. Enable Voltage 21.0 22 20.8 VEN=3V 20 20.6 VIN=4V 18 16 20.4 14 ILED (mA) 20.2 ILED (mA) 4 Enable Voltage (V) Case Temperature ( C) 20.0 19.8 12 10 VEN=3V 8 o 19.6 TC=-40 C 6 o 19.4 4 TC=25 C 19.2 2 TC=85 C o 19.0 -40 0 -20 0 20 40 60 80 100 0 120 O Figure 6. LED Current vs. Case Temperature Oct. 2010 100 200 300 400 500 600 700 800 900 1000 Output Voltage (mV) Case Temperature ( C) Figure 7. LED Current vs. Output Voltage Rev 1. 1 BCD Semiconductor Manufacturing Limited 6 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 120 1.0 110 0.8 100 0.6 90 Current Matching (%) Dropout Voltage (mV) Typical Performance Characteristics (Continued) 80 70 60 50 0.4 0.2 0.0 -0.2 -0.4 40 -0.6 30 -0.8 20 -40 -20 0 20 40 60 80 100 120 VEN=3V VLED=300mV -1.0 -40 140 -20 0 20 o 40 60 80 100 120 140 o Case Temperature ( C) Case Temperature ( C) Figure 8. Dropout Voltage vs. Case Temperature Figure 9. Current Matching vs. Case Temperature 110 24.0 23.5 100 23.0 90 22.5 LED Current Efficiency (%) 22.0 21.5 ILED (mA) 21.0 20.5 20.0 19.5 19.0 18.5 18.0 17.5 VLED=300mV 17.0 o TC=25 C 16.5 16.0 2.0 70 60 50 40 f=100Hz f=10kHz f=100kHz f=150kHz o TC=25 C 30 20 10 0 -10 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 0 Enable Voltage (V) 10 20 30 40 50 60 70 80 90 99 Duty Cycle (%) Figure 10. LED Current vs. Enable Voltage Oct. 2010 80 Figure 11. LED Current Efficiency vs. Duty Cycle Rev 1. 1 BCD Semiconductor Manufacturing Limited 7 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Typical Performance Characteristics (Continued) VEN 2V/div I1 VEN 2V/div I2 ILED 10mA/div ILED 10mA/div Time 2ms/div Time 400µs/div Figure 12. LED Current (Note 2) (VIN=4V, VEN=0 to 3.6V, Duty cycle=50%, fPWM=1kHz) Figure 13. Internal Oscillator Working at Low Frequency (VIN=4V, VEN=0 to 3.6V, Duty cycle=50%, fPWM=0.1kHz) Note 2: Chopper offset-canceling technology is adopted to get good current matching, ILED=[(I1+I2)/2]*duty. Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited 8 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Typical Application Figure 14. AP2502 Typical Application Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited 9 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Mechanical Dimensions SOT-23-6 Unit: mm(inch) 0° 2.820(0.111) 8° 3.020(0.119) 0.300(0.012) 0.400(0.016) 6 0.200(0.008) 5 0.300(0.012) 0.600(0.024) 4 Pin 1 Dot by Marking 1 2 3 0.700(0.028)REF 0.950(0.037)TYP 0.000(0.000) 0.150(0.006) 1.800(0.071) 2.000(0.079) 0.100(0.004) 0.200(0.008) 0.900(0.035) 1.450(0.057) MAX 1.300(0.051) Oct. 2010 Rev 1. 1 BCD Semiconductor Manufacturing Limited 10 Data Sheet 4-CH Linear Constant Current Sink With Matching AP2502 Mechanical Dimensions (Continued) TSOT-23-6 2.800(0.110) 3.000(0.118) 1.500(0.059) 1.700(0.067) Unit: mm(inch) R0.100(0.004) MIN 0° 8° 2.600(0.102) 3.000(0.118) Pin 1 Dot by Marking 0.370(0.015) MIN 0.950(0.037) BSC 0.100(0.004) 0.250(0.010) 1.900(0.075) BSC 0.250(0.010) BSC GAUGE PLANE 0.700(0.028) 0.900(0.035) 1.000(0.039) MAX 0.000(0.000) 0.100(0.004) Oct. 2010 0.350(0.014) 0.510(0.020) Rev 1. 1 BCD Semiconductor Manufacturing Limited 11 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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