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MAX1707 Fiches technique(PDF) 1 Page - Maxim Integrated Products |
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MAX1707 Fiches technique(HTML) 1 Page - Maxim Integrated Products |
1 / 15 page General Description The MAX1707 provides complete light management for main display backlight, subdisplay backlight (or RGB indicator), and white LED camera flash with regulated constant current up to 610mA total. By utilizing adap- tive 1x/1.5x/2x charge-pump modes and very-low- dropout current regulators, it achieves high efficiency over the full 1-cell Li+ battery input voltage range. The 1MHz fixed-frequency switching allows for tiny external components while the regulation scheme is optimized to ensure low EMI and low input ripple. An integrated derating function protects the LEDs from overheating during high ambient temperatures. The MAX1707 features an internally trimmed reference to set the maximum LED current. An I2C† serial port is used for on/off control and setting the LED currents in 32 linear steps. When using the RGB indicator, the I2C port provides 32k colors and programmable ramp- up/down rates. The camera flash may be turned on/off by the I2C port or a separate digital logic input. Applications Cell Phones and Smartphones PDAs, Digital Cameras, Camcorders Displays with Up to 11 LEDs Features ♦ Guaranteed 610mA Continuous Drive Capability 4 LEDs at 30mA Each for Main Display 3 LEDs at 30mA Each for Sub or RGB 400mA Total for Flash ♦ 2-Wire I2C Serial Port 5-Bit (32-Step) Linear Dimming 32k Colors Ramp-Up/Down Rates ♦ 92% Peak/83% Avg Efficiency (PLED/PBATT) ♦ Adaptive 1x/1.5x/2x Mode Switchover ♦ 0.3% (typ) LED Current Accuracy and Matching ♦ Low Input Ripple and EMI ♦ Low 0.1µA Shutdown Current ♦ Output Overvoltage Protection ♦ Thermal Derating Function Protects LEDs ♦ 24-Pin 4mm x 4mm Thin QFN Package Light-Management IC with Efficient 1x/1.5x/2x Charge Pump for Backlight/Flash/RGB LEDs ________________________________________________________________ Maxim Integrated Products 1 Ordering Information MAX1707 1 µF1µF 10 µF 0.1 µF IN PIN SDA SCK STB GND OUT C1P C1N PGND C2P FLASH MAIN C2N 4.7 µF I2C PORT ON/OFF AND BRIGHTNESS INPUT 2.7V TO 5.5V OUTPUT UP TO 610mA M1 M2 M3 M4 S1 S2 S3 F1 F2 F3 F4 STROBE ON/OFF VLOGIC VDD SUB OR RGB Typical Operating Circuit 19-3744; Rev 0; 7/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Pin Configuration appears at end of data sheet. EVALUATION KIT AVAILABLE PART TEMP RANGE PIN- PACKAGE PKG CODE MAX1707ETG -40°C to +85°C 24 Thin QFN 4mm x 4mm T2444-4 †Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these com- ponents in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. |
Numéro de pièce similaire - MAX1707 |
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Description similaire - MAX1707 |
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