MAX1707 – Light-Management IC

Part Number : MAX1707

Function : Light-Management IC

Manufactures : Maxim Integrated Products

Images :

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MAX1707 image

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Description :

19-3744; Rev 0; 7/05 T EVALUATION KI AVAILABLE Light-Management IC with Efficient 1x/1.5x/2x Charge Pump for Backlight/Flash/RGB LEDs 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 adaptive 1x/1.5x/2x charge-pump modes and very-lowdropout 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 rampup/down rates. The camera flash may be turned on/off by the I2C port or a separate digital logic input. 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 MAX1707 Applications Cell Phones and Smartphones PDAs, Digital Cameras, Camcorders Displays with Up to 11 LEDs †Purchase of I2C components from Maxim Integrated Products, Ordering Information PART MAX1707ETG TEMP RANGE -40°C to +85°C PINPACKAGE 24 Thin QFN 4mm x 4mm PKG CODE T2444-4 Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. Pin Configuration appears at end of data sheet. Typical Operating Circuit 1µF INPUT 2.7V TO 5.5V 4.7µF 1µF OUTPUT UP TO 610mA 10µF MAIN SUB OR RGB FLASH C1P IN PIN GND C1N C2P C2N OUT MAX1707 VLOGIC 0.1µF VDD I2C PORT ON/OFF AND BRIGHTNESS STROBE ON/OFF SCK SDA STB PGND M1 M2 M3 M4 S1 S2 S3 F1 F2 F3 F4 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at Light-Management IC with Efficient 1x/1.5x/2x Charge Pump for Backlight/Flash/RGB LEDs MAX1707 ABSOLUTE MAXIMUM RATINGS VDD, IN, PIN, SCK, SDA, STB, OUT to GN […]

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MAX1707 Datasheet

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