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PAM2701 Datasheet(PDF) 1 Page - Power Analog Micoelectronics |
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PAM2701 Datasheet(HTML) 1 Page - Power Analog Micoelectronics |
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1 / 14 page  Features Applications n n n n n n n n n n n Peak Efficiency: 90% Individual Current Regulation 3-bit Digital Output Control Two modes of operation:1x and 1.5x Current Matching with a Max Tolerance of 3% Output Current up to 30mA per LED Total LED Current up to 4*30mA=120mA Fixed Frequency of 1MHz Open LED Protection Space Saving Package QFN 3mmx3mm and QFN 4mmx4mm Pb-Free Package Cellular Phones LED Backlighting LCD Modules Handheld Devices Digital Cameras PDAs PMPs MP3 Players The PAM2701 is a 4-channel charge pump white LED driver, capable of driving up to 4 LEDs in parallel. The device operates in either 1x mode or 1.5x fractional mode, and it can switch from 1x mode to 1.5x mode automatically when the input voltage decreased. Its internal 4 current sink regulators ensure both the LED current matching and the brightness uniformity. The LED current can be programmed by an external resistor, R , connected between the RSET pin and ground. LED current of up to 30mA are supported by the input supply voltage over a range of 2.7V to 5.5V, making the device optimized for Li-Ion battery applications. The PAM2701 has a fixed switching frequency of 1MHz, allowing the use of very small value ceramic capacitors. The enable input pin allows the device to be set in shutdown mode, and the current consumption is reduced to less than 1μA. LED dimming can be done by several methods including using a DC voltage to set the RSET pin current, adding a switched resistor in parallel with R or applying a PWM signal to CTRx pin or EN pin. n n n n n n n n Description SET SET, Typical Application PAM2701 4-Channel Regulated Charge Pump White LED Driver , Power Analog Microelectronics Inc 1 www.poweranalog.com PAM2701 EN Control 0 Control 1 Control 2 C 1μF IN V IN 1μF 1μF Co 1μF 20mA R 24kΩ SET C1 C1 C2 C2 VIN VOUT EN CTR0 LED1 CTR1 LED2 CTR2 LED3 RSET LED4 GND +- +- 1 2 3 4 5 6 7 8 910 11 12 13 14 15 16 09/2008 Rev 1.3 |
Número de pieza similar - PAM2701 |
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Descripción similar - PAM2701 |
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