PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Features Description n n n n n n n n n Support up to 4 LEDs LED sink current 20mA Low Dropout Voltage Low Quiescent Supply Current:270uA(typ) No Noise and EMI Shutdown Current Less than 1uA Over Temperature Protection 16-Step Brightness Control Small Package: QFN3x3-16L,MSOP-8L SOT23-8L, DFN2X2-8L n Pb-free Package The PAM2811 provides 4 regulated current sinks, capable of sinking up to 20mA current to accommodate 4 white LEDs. It requires no charge pump, has no noise and EMI, and significantly improves the efficiency in Li battery range. LED brightness can be controlled by Single-wire dimming techniques. The constant current sink is set by16-step. The PAM2811 is available in QFN3x3-16L,MSOP8L, SOT23-8L and DFN2X2-8L Packages. Applications n Mobile phone n Digital camera n PDA Mp3 Typical Application VIN VI N 1uF GND PAM2811 LED1 PGND LED2 Pulse Input ss EN LED3 LED4 1 2 n≤16 Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 1 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Block Diagram VIN LED1 LED2 Reference LED3 LED4 EN Current Setting Current Sinks AGND 0.5us<t HI 0.5us<t LO<500us 30us<t READY EN 1 4 3 2 16 PGND 15 ILED LEVEL 14 16 12 11 SHDN 4 3 2 1 6 5 13 30us<t READY 2ms<t SHDN 15 14 5 13 14 16 15 1 16 12 3 2 1 Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 2 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Pin Configuration & Marking Information 16 15 14 13 16 15 14 13 3 EN NC NC NC LED3 10 LED4 9 NC 11 5 6 7 PGND VIN EN 4 12 1 P2811B XXXYW 2 NC 10 NC 9 NC 3 4 8 QFN3x3-16L 7 5 6 8 VIN 1 PGND 1 VIN 3 AGND 4 LED4 7 LED3 NC 2 6 LED2 GND 3 5 LED1 8 LED4 EAXYW P2811C XXXYW EN 2 8 EN 4 MSOP-8L GND 11 VIN VIN NC P2811A XXXYW 2 LED2 NC 12 1 AGND NC NC NC NC LED3 LED4 LED1 LED2 NC LED1 NC NC Top View 7 LED3 6 LED2 5 LED1 SOT23-8 DFN 2X2-8 1 8 LED1 EN 2 7 LED2 VIN 3 6 LED3 AGND 4 5 LED4 P2811E XXXYW PGND Y: Year W: Week X: Internal Code Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 3 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Pin Description P2811A P2811B P2811C 1 2 2 3 3 4 4 5 5 6 7 8 12 6 7 1 P2811D P2811E Symbol - - - NC - 2 - NC - - - NC Function - - - NC 4 3 4 AGND Analog Ground 1 PGND Power Ground 1 3 1 3 VIN Supply Input VIN Supply Input 2 4 2 EN 9 8 - - - NC 10 13 8 8 5 LED4 11 14 7 7 6 LED3 12 15 6 6 7 LED2 13 16 5 5 8 LED1 14 9 - - - NC 15 10 - - - NC 16 11 - - - NC Enable Pin. Active high, with an internal 150k Ω pull-down resistor. LED4 Pin, Connect to the LED cathode, leave it to connect GND or open if unused LED3 Pin, Connect to the LED cathode, leave it to connect GND or open if unused LED2 Pin, Connect to the LED cathode, leave it to connect GND or open if unused LED1 Pin, Connect to the LED cathode, leave it to connect GND or open if unused Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 4 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Absolute Maximum Ratings These are stress ratings only and functional operation is not implied . Exposure to absolute maximum ratings for prolonged time periods may affect device reliability . All voltages are with respect to ground . Input Voltage Range............................-0.3V to 6V PWM Pin voltage................. -0.3V to (V IN+0.3V)/6V Maximum Junction Temperature..................150°C Storage Temperature.....................-65 °C to 150 °C Soldering Temperature....................... 300°C,5sec Recommended Operating Conditions Input Voltage Range.......................... 2.7V to 5.5V Junction Temperature Range..........-40°C to 125°C Ambient Temperature Range............-40 °C to 85 °C Thermal Information Parameter Package Symbol Maximum QFN 3x3-16L Thermal Resistance (Junction to Ambient) MSOP-8L SOT23-8 35 180 θJA 80 QFN 3x3-16L 14 SOT23-8 °C/W 250 DFN2X2-8L MSOP-8L Thermal Resistance (Junction to Case) Unit 75 θJC °C/W 130 20 DFN2X2-8L Electrical Characteristic T A=25 °C , V IN=3.6V, unless otherwise noted. PARAMETER Symbol Input Voltage V IN Output Current ILED Current Matching LED Dropout Voltage V DO CONDITIONS MIN TYP 2.7 All LEDs 100% setting 18 All LEDs 100% setting -3 20 V 22 mA +3 % mV μA ILED=0 270 Shutdown Current ISD VEN=0V, VIN=5.5V 0.1 Startup Time T ON EN Input Logic High VHI EN Input Logic Low V LO EN Low Time for Dimming TLO 0.5 EN High Time for Dimming T HI 0.5 Thermal Shutdown Temperature 5.5 60 IQ T OFF UNITS ILED=20mA Quiescent Current Shutdown Delay Time MAX 1 30 μs 1.5 VEN=0V TP Hysteresis Temperature μA V 0.4 V 500 μs μs 1000 2000 μs 150 ℃ 30 ℃ Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 5 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Typical Performance Characteristics V IN =5.0V,T A=25°C, unless otherwise noted. LED Current VS Input Voltage 25 25 20 20 LED Current(mA) LED Current(mA) LED Current VS LED Pin Voltage 15 10 15 10 5 5 0 0 0 0.2 0.4 0.6 LED Pin Voltage(V) 0.8 2 1 3 3.5 4 4.5 5 5.5 Input Voltage(V) LED Current VS EN Steps Efficiency VS Input Voltage 100 90 80 25 20 LED Current(mA) Efficiency(%) 2.5 70 60 50 40 30 15 10 5 20 10 0 0 2.5 3 3.5 4 4.5 5 1 5.5 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 EN Steps Input Voltage(V) Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 6 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Application Information The PAM2811 is a 4-channel programmable white-LED driver. It is capable of supplying 20mA per channel with a total of 80mA output current available. LED brightness control of PAM2811 can be achieved with a Pulses signal. Over Temperature Protection T h e PA M 2 8 11 e q u i p s o v e r t e m p e r a t u r e protection. When the junction temperature (T J) exceeds +150°C, the current source turns off automatically. The device will turn on again after the IC’s T J cools down under +120°C. Operating at absolute maximum temperature is not recommended. Enable Input The EN input is used to enable or disable the PAM2811. Pulling the EN pin higher than 1.5V will enable the device. For producing constant, nonpulsating output current compare to conventional pulse width modulation(PWM) dimming scheme. The PAM2811 incorporates a 4-bit DAC for brightness control to program the output current at 16 continuous steps:20~1.25mA. Table1 shows details for current setting. Table 1 Current Setting Data 16 15 14 13 12 11 10 9 Current(mA) 20 18.75 17.5 16.25 15 13.75 12.5 11.25 Data 8 7 6 5 4 3 2 1 Current(mA) 10 8.75 7.5 6.25 5 3.75 2.5 1.25 Page2 shows the detail operation of 16-steps brightness control. When Single-wire pulse counting dimming is used, the ready time is recommended to be greater than 30us for enabling the device, the pulse high time THI recommended to be greater than 0.5us, and the pulse low time T LO is recommended to be greater than0.5us and less than 500us. A constant current is sourced as long as the EN signal remains high. The shutdown feature reduces quiescent current to less than 0.1uA. LED connection The PAM2811 supports up to 4 white LEDs. The four LEDs are connected from VIN to LEDx respectively. If the LED is not used, it should be connected to GND or open. Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 7 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Ordering Information PAM 2811 X X X X Shipping Package Number of Pins Package Type Pin Configuration Part Number PAM2811AJER PAM2811BJER PAM2811CSCR PAM2811DACR PAM2811EYCR Marking Package Type Shipping Package QFN3x3-16L 3,000Units/Tape&Real QFN3x3-16L 3,000Units/Tape&Real MSOP-8L 2,500Units/Tape&Real SOT23-8 3,000Units/Tape&Real DFN2X2-8L 3,000Units/Tape&Real P2811A XXXYW P2811B XXXYW P2811C XXXYW EAXYW P2811E XXXYW Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 8 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Outline Dimensions 3x3 mm QFN 16 DIMENSIONS (Millieters) MIN TYP MAX A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A2 0.20 b 0.18 0.25 0.30 D 2.90 3.00 3.10 D1 1.55 1.70 1.80 E 2.90 3.00 3.10 E1 1.55 1.70 1.80 e L 0.50BSC 0.30 0.40 N 16 aaa 0.08 bbb 0.10 0.50 Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 9 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Outline Dimensions MSOP-8 REF Millimeter Min Max A -- 1.10 A1 0.05 0.15 A2 0.78 0.94 b 0.22 0.38 c 0.08 0.23 D 2.90 3.10 E 2.90 3.10 E1 4.75 5.05 e L 0.65BSC 0.40 0.70 Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 10 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Outline Dimensions SOT23-8 (REF.) 0.20 (MAX) (TYP) (REF.) Symbol A A1 A2 c D E E1 Dimensions In Millimet ers Min Max 1.45 MAX 0 0.10 1.10 1.30 0.12 (REF) 3.10 2.70 3.00 2.60 1.80 1.40 Symbol L L1 θ b e e1 L1 ( REF.) Dimensions In Millimet ers Min Max 0.60 0.30 0.60 (REF) 10° 0° 0.38 0.22 0.65 (REF) 0.33 (REF) Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 11 PAM2811 4-Channel Single-Wire Dimming LED Drive with Ultra Low Dropout Current Sink Outline Dimensions DFN 2x2 D A B INDEX AREA (D/2 xE/2) E 4 TOP VIEW C A A1 9 8 SEATING PLANE SIDE VIEW 0.08 C e Nxb Pin#1 ID INDEX AREA (D/2 xE/2) NxL NxK E2 4 D2 BOTTOM VIEW SYMBOL A A1 Lead Pitch (e) 0.50 MIN 0.70 0.00 COMMON DIMENSION NOM MAX 0.75 0.80 0.02 0.05 Summary Table Lead Body Count Size 8 2X2 Pin #1 ID R0.20 D BSC E BSC MIN b NOM MAX MIN D2 NOM MAX MIN E2 NOM MAX MIN L NOM MAX N 2.00 2.00 0.18 0.25 0.30 1.05 1.20 1.30 0.45 0.60 0.70 0.20 0.30 0.40 8 Unit: Millimeters Power Analog Microelectronics , Inc www.poweranalog.com 03/2010 Rev1.0 12