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PAM2810 Dataheets PDF



Part Number PAM2810
Manufacturers Power Analog Micoelectronics
Logo Power Analog Micoelectronics
Description 4-Channel Programmable LED Current Sink
Datasheet PAM2810 DatasheetPAM2810 Datasheet (PDF)

4-Channel Programmable LED Current Sink PAM2810 Features n n n n n Description The PAM2810 provides 4 regulated current sinks, capable of sinking up to 40mA current to accommodate 4 white LEDs. It requires no charge pump, has no noise and EMI, and significantly improves the efficiency in Li bettery range. LED brightness can be controlled by PWM techniques. The constant current sink is set with an external sense resistor. Alternatively, a PWM signal applied to the EN pin can vary the anticipat.

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4-Channel Programmable LED Current Sink PAM2810 Features n n n n n Description The PAM2810 provides 4 regulated current sinks, capable of sinking up to 40mA current to accommodate 4 white LEDs. It requires no charge pump, has no noise and EMI, and significantly improves the efficiency in Li bettery range. LED brightness can be controlled by PWM techniques. The constant current sink is set with an external sense resistor. Alternatively, a PWM signal applied to the EN pin can vary the anticipated brightness of the LED. The device is in shut down mode when the EN input is logic low. The PAM2810 is available in SOT23-8 and DFN 2 mmX2mm Packages. n n n n n Cost Effective LED Driver Support up to 4 White LEDs Output Current up to 40mA per LED Low Dropout Voltage Ultra Low Quiescent Supply Current: 65 μ A (typ) No Noise and EMI Shutdown Current Less than 1 μ A Over Temperature Protection Small Packages : SOT23-8 and DFN 2mmx2mm Pb-free Package Applications n White LED for LCD Display Backlights n White LED Keypad Backlights n 1-Cell Li-Ion Battery-operated Equipment Including PDAs, Hand-held PCs, Cellular Phone Typical Application Circuit VIN C1 0.1μF 4 VIN 2 EN www.DataSheet4U.com LED1 8 1 LED2 7 PAM2810 LED3 6 LED4 5 GND 3 ISET R1 6.2 k Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 1 4-Channel Programmable LED Current Sink PAM2810 Typical Application Circuit V BAT VIN C1 0.1μF 4 VIN 2 LED1 EN PAM2810 1 ISET LED4 GND R1 6.2kΩ 3 R1 6.2k Ω VIN C1 0.1μF 4 VIN 2 LED1 EN PAM2810 1 ISET LED4 GND 3 LED2 LED3 8 7 6 5 8 7 6 5 NC LED2 LED3 Block Diagram VIN www.DataSheet4U.com VIN C IN 0.1 μ F 1.22V Ref LED1 LED2 LED3 LED4 EN ISET Current Setting Current Sinks RSET GND Power Analog Microelectronics , Inc www.poweranalog.com 08/2008 Rev 1.1 2 4-Channel Programmable LED Current Sink PAM2810 Pin Configuration Top View DFN 2mmX2mm Top View SOT23-8 VIN GND EN ISET 1 2 3 4 8 7 6 5 LED1 LED2 LED3 LED4 ISET EN GND VIN 1 EJXYW 8 7 6 5 LED1 LED2 LED3 LED4 2 3 4 EJ: Product Code X: Internal Code Y: Year W: Week Pin Number DFN2x2 1 2 3 4 5 6 7 8 SOT23-8 4 3 2 1 5 6 7 8 EJX YW Name VIN GND EN ISET LED4 LED3 LED2 LED1 Description Input Voltage Ground Enable, Allow PWM Brightness Control, Active High LED Current Adjustment Pin LED4 Cathode Terminal LED3 Cathode Terminal LED2 Cathode Terminal LED1 Cathode Terminal www.DataSheet4U.com Power Analog Microelectronics , Inc www.poweranalog.com 07/2008 Rev 1.1 3 4-Channel Programmable LED Current Sink PAM2810 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 Operation Junction Temperature.....-40°C to 125 °C PWM Pin voltage............... -0.3V to (VIN+0.3V)/6V Storage Temperature.....................-65 °C to 150 °C Maximum Junction Temperature..................150°C Soldering Temperature....................... 300°C,5sec Recommended Operating Conditions Input Voltage Range.......................... 2.7V to 5.5V Operation Temperature Range.........-40 °C to 85 °C Thermal Information Parameter Thermal Resistance (Junction to Ambient) Thermal Resistance (Junction to Case) Symbol Package SOT23-8 θJA DFN SOT23-8 θJC DFN 20 102 ºC/W 130 Maximum 250 Unit Electrical Characteristic T A=25°C, V IN=3.6V, R SET=5.1k Ω, V LEDX=0.5V, unless otherwise noted. PARAMETER Input Voltage www.DataSheet4U.com Symbol V IN ILEDX ILED-MATCH VDROPOUT V SET ILEDX/ISET IQ ISHDN VHI V LO IEN CONDITIONS MIN Vf+V LED (Note) TYP 3.6 MAX 5.5 40 ±5 UNITS V mA % V V Output Current VDD=5V Current Matching Between Any Two Outputs Current Sink Dropout ISET PIN Voltage Output Current to Current Set Ratio Quiescent Supply Current Shutdown Supply Current EN Input Logic High EN Input Logic Low EN Pin Current Rset=3kΩ,ILEDX=40mA 1.22 100 Rset=10MΩ,with no loads EN=logic low 1.4 65 0.1 0.25 80 1 0.4 μA μA V V μA μA V(EN) = 1.5V V(EN) = 0V 0.1 0.1 1 1 Note: Vf: LED forward voltage; V LED: voltage of LEDx pins. Power Analog Microelectronics , Inc www.poweranalog.com 07/2008 Rev 1.1 4 4-Channel Programmable LED Current Sink PAM2810 Typical Performance Characteristics T A=25°C, V IN=3.6V, R SET=5.1k Ω, V LEDX=0.5V, unless otherwise noted. LED Current VS LED Pin Voltage 45 40 LED Current (mA) 45 40 35 LED Curent VS Input Voltage 35 30 25 20 15 10 5 0 0 0.3 0.6 0.9 1.2 1.5 LED Pin Voltage(V) R=12.7KΩ R=4.3KΩ R=6.2KΩ R=3.2KΩ LED Curent(mA) 30 25 20 15 10 5 0 3 3.5 4 4.5 5 5.5 Input Voltage(V) R=12.7KΩ R=4.3KΩ R=6.2KΩ R=3.2KΩ VIset VS Input Voltage 1.2135 1.2125 LED Current VS Rset 50 45 40 LED Current(mA) 1.2115 Viset(V) 35 30 25 20 15 10 5 0 1.2105 1.2095 1.2085 www.DataSheet4U.com 1.2075 3 3.5 4 4.5 5 5.5 0 5 10 Rset(kΩ) 15 20 Input Voltage(V) Efficiency VS Input Voltage 100 9.


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