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MAX8645XETI Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8645XETI Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 14 page EVALUATION KIT AVAILABLE General Description The MAX8645X/MAX8645Y charge pumps drive up to eight white LEDs with regulated constant current for uni- form intensity. The main group of LEDs (M1–M6) can be driven up to 30mA per LED for backlighting. The flash group of LEDs (F1 and F2) is independently controlled and can be driven up to 200mA per LED (or 400mA total). Two 200mA LDOs are on-board to provide power for camera functions. The LDOs’ output voltages are pin pro- grammable to meet different camera-module require- ments. The MAX8645X and MAX8645Y differ only in LDO output voltages. By utilizing adaptive 1x/1.5x/2x charge- pump modes and very-low-dropout current regulators, the MAX8645X/MAX8645Y achieve high efficiency over the full 1-cell lithium-battery voltage range. The 1MHz fixed-frequency switching allows for tiny external compo- nents, and the regulation scheme is optimized to ensure low EMI and low input ripple. The MAX8645X/MAX8645Y are available in a 28-pin TQFN, 4mm x 4mm (0.8mm max height) lead-free package. Applications Camera Phones and Smartphones Backlighting and Flash PDAs, Digital Cameras, and Camcorders Features ♦ Power Up to Eight LEDs Up to 30mA/LED Drive for Backlight Up to 400mA Total Drive for Flash ♦ Two Internal Low-Noise 200mA LDOs ♦ 94% Max/85% Avg Efficiency (PLED/PBATT) over Li+ Battery Discharge ♦ 0.2% Typical LED Current Matching ♦ Adaptive 1x/1.5x/2x Mode Switchover ♦ Single-Wire, Serial-Pulse Interface for Brightness Control (32 Steps) ♦ Thermal TA Derating Function ♦ Low Input Ripple and EMI ♦ 2.7V to 5.5V Supply Voltage Range ♦ Soft-Start, Overvoltage, and Thermal-Shutdown Protection ♦ 28-Pin TQFN, 4mm x 4mm Package 1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-3978; Rev 4; 6/08 PART TEMP RANGE PIN-PACKAGE MAX8645XETI+ -40°C to +85°C 28 TQFN-EP 4mm x 4mm MAX8645YETI+ -40°C to +85°C 28 TQFN-EP 4mm x 4mm Pin Configuration appears at end of data sheet. MAIN ON/OFF AND DIMMING MAX8645X MAX8645Y 1 μF 10 μF 0.01 μF 10 μF PIN IN PGND GND P1 P2 OUT MAIN FLASH OUTPUT UP TO 580mA 1 μF 1 μF LDO1 LDO2 C2P C2N 1 μF C1P C1N REF SETM SETF CAMERA MODULE DUAL-LDO VOLTAGE SELECTION INPUT 2.7V TO 5.5V ENM2 ENM1 ENF ENLDO M1 M2 M3 M4 M5 M6 F1 F2 FLASH ON/OFF DUAL-LDO ON/OFF Typical Operating Circuit EP = Exposed pad. + Denotes a lead-free package. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. |
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