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| ABRIDGED 19-0681; Rev 2; 11/07 KIT ATION EVALU LE B AVAILA Smallest, All-Internal MOSFET, 7-Channel DSC PMIC in Tiny 5mm x 5mm Thin QFN General Description The MAX8680 highly efficient complete power-supply solution is designed for digital still cameras (DSCs) and digital video cameras (DVCs). The device integrates seven on-chip power MOSFET DC-DC converters with up to 95% efficiency to power all critical power supplies in DSC systems. Each converter also features True ShutdownTM, as well as internal compensation to minimize external component count. The seven DC-DC converter outputs are: * Step-up synchronous-rectified DC-DC converter (SU). The MAX8680 is bootstrapped from VSU. * * * MAIN synchronous-rectified step-down DC-DC converter (M) for DSP I/O supply voltage. DDRZ synchronous-rectified step-down DC-DC converter (Z) for DSP DDR supply voltage. Low-voltage (down to 1V) synchronous-rectified step-down DC-DC converter (SD) for DSP core supply voltage. High-voltage, step-up DC-DC converter with current regulation and PWM dimming control (LEDBST) for white LEDs (WLED). High-voltage step-up DC-DC converter (CCDBST) for CCD imagers or positive LCD bias supplies. Transformerless inverting DC-DC converter (CCDINV) for CCD imagers or negative LCD bias supplies. Features 95% Efficient Synchronous-Rectified DC-DC Converters 90% Efficient Boost-Buck Operation 85% Efficient DC-DC Converters for CCD, LCD, WLED, and/or OLED Internal Compensation on All Channels True Shutdown on All Step-Up Converters Overload Protection Soft-Start for Controlled Startup Current Dropout Operation (100% Duty Cycle) on StepDown Converters Regulated Current Output for Up to 6 White LEDs PWM Dimming of WLED Current Adjustable LED Overvoltage Protection Up to 27V Transformerless Inverting Converter for CCD 2MHz Switching Frequency for Low-Voltage Channels 2.5% Switching Frequency Accuracy 1A Shutdown Supply Current Power-On Voltage Tracking for Core and Main Outputs All Internal Power MOSFETs SDOK Power-OK Indicator MAX8680 * * * The MAX8680 has an independent/simultaneous power-on sequence of the CCDBST and CCDINV converters. For a preset power-on sequence of CCDBST before CCDINV, contact the factory. The MAX8680 operates with 1-cell lithium-ion (Li+) battery, two-AA cell, or dual-battery designs and is available in a 5mm x 5mm, 40-pin thin QFN package. The MAX8680 operates over the -40C to +85C extended temperature range. Typical Operating Circuit INPUT 2.7V TO 5.5V SU STEP-UP MAIN STEP-DOWN SD STEP-DOWN DDRZ STEP-DOWN VSU 5V VMAIN 3.3V VSD 1.8V VDDRZ 2.5V BATT ONSU ONM ONSD ONZ Applications DSCs and DVCs PDAs and Portable Media Players GPS Navigation Systems MAX8680 SDOK ONLED ONBST ONINV LEDBST CCDBST CCDINV VLEDBST UP TO 6 WLEDs VCCDBST +15V VCCDINV -7.5V Ordering Information PART MAX8680ETL+ TEMP RANGE -40C to +85C PIN-PACKAGE 40 Thin QFN-EP* 5mm x 5mm x 0.8mm PKG CODE T4055-2 +Denotes a lead-free package. *EP= Exposed paddle. Pin Configuration appears at the end of data sheet. True Shutdown is a trademark of Maxim Integrated Products, Inc. 1 ________________________________________________________________ Maxim Integrated Products 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. ABRIDGED Smallest, All-Internal MOSFET, 7-Channel DSC PMIC in Tiny 5mm x 5mm Thin QFN MAX8680 VBATT OR VSU C20 0.1F VBATT (2V TO 5.5V) C1 22F C2 22F C18 1F D3 C19 4.7F L7 4.7H 32 31 VSU (5V, 500mA) C3 22F R1 402k C4 22F R17 100 26 C16 0.1F 27 SU 29 LXSU LXSU FBINV SWBST 23 17 R14 100k L6 4.7H R13 604k VCCDINV (-7.5V, 100mA) 24 REF 33 BATT 16 PVINV 15 LXINV L1 2H PVSU 30 PVSU MAX8680 LXBST PGBST (EP) FBSU PGSU (EP) FBBST 22 19, 20 D2 C17 1F VREF VCCDBST (15V, 30mA) R11 1.4M R2 100k C5 1F VSU 38 PGSU (EP) PVM VBATT PVBST 18 VBATT PVLED SWLED 13 14 11, 12 9 L5 4.7H D1 C16 1F R12 100k VMAIN (3.3V, 300mA) R3 232k C6 10F C7 10F L2 4.7H C14 1F VLEDBST (16V, 30mA) C15 1F R9 1.6M D4 D5 R10 100k D6 D7 39 LXM 1 R4 100k C8 10F VBATT 34 FBM PGM (EP) LXLED OVLED PVSD FBLED 8 VSD (1.8V, 250mA) R5 80k C10 10F C9 10F L3 4.7H 35 LXSD PGLED (EP) EP GND PVZ 25 36 L4 4.7H C12 10F FBZ PGZ (EP) SDOK 3 R16 100k VBATT R8 100k C13 10F VDDRZ (2.5V, 200mA) R7 150k VBATT OR VSU C11 1F R15 10 5 R6 100k 28 40 6 10 21 7 FBSD PGSD (EP) ONSU ONM ONSD ONLED ONBST ONINV ONZ LXZ 37 NOTE: ALL CONVERTERS' POWER GROUND CONNECTIONS ARE THROUGH THE EXPOSED PADDLE (EP). 2 4 Figure 1. MAX8680 Typical Application Circuit (for Li+ Cell Design, Connect PVZ and PVINV to BATT; for Two-AA or Dual-Battery Design, Connect PVZ and PVINV to PVSU) 14 ______________________________________________________________________________________ |
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