ABRIDGED KIT ATION EVALU E L B AVAILA 19-0681; Rev 2; 11/07 Smallest, All-Internal MOSFET, 7-Channel DSC PMIC in Tiny 5mm x 5mm Thin QFN Features 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 Shutdown™, 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. ♦ 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 ♦ 1µA Shutdown Supply Current ♦ Power-On Voltage Tracking for Core and Main Outputs ♦ All Internal Power MOSFETs ♦ SDOK Power-OK Indicator • 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. 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 -40°C to +85°C extended temperature range. Typical Operating Circuit INPUT 2.7V TO 5.5V BATT ONSU ONM Applications DSCs and DVCs ONSD PDAs and Portable Media Players ONZ GPS Navigation Systems SDOK MAX8680ETL+ TEMP RANGE PIN-PACKAGE -40°C to +85°C 40 Thin QFN-EP* 5mm x 5mm x 0.8mm +Denotes a lead-free package. *EP= Exposed paddle. MAIN STEP-DOWN SD STEP-DOWN DDRZ STEP-DOWN VSU 5V VMAIN 3.3V VSD 1.8V VDDRZ 2.5V MAX8680 Ordering Information PART SU STEP-UP PKG CODE ONLED LEDBST VLEDBST UP TO 6 WLEDs ONBST CCDBST VCCDBST +15V ONINV CCDINV VCCDINV -7.5V T4055-2 Pin Configuration appears at the end of data sheet. True Shutdown is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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. 1 MAX8680 General Description ABRIDGED MAX8680 Smallest, All-Internal MOSFET, 7-Channel DSC PMIC in Tiny 5mm x 5mm Thin QFN VBATT OR VSU C20 0.1μF VBATT (2V TO 5.5V) C1 22μF C2 22μF 24 REF 33 BATT C4 22μF LXSU FBINV PVSU 30 PVSU SWBST 17 R14 100kΩ MAX8680 C16 0.1μF SU LXBST FBSU PGSU (EP) VSU 38 L2 4.7μH VMAIN (3.3V, 300mA) C6 10μF C17 1μF FBBST 39 LXM 34 L3 4.7μH VSD (1.8V, 250mA) C10 10μF PVLED SWLED VBATT C8 10μF PVBST FBM PGM (EP) OVLED 5 R6 100kΩ 28 40 6 10 21 7 2 C16 1μF VBATT C14 1μF R12 100kΩ 18 13 L5 4.7μH 14 VLEDBST (16V, 30mA) D1 C15 1μF 11, 12 R9 1.6MΩ D4 9 D5 D6 D7 PVSD FBLED 35 VBATT R10 100kΩ LXSD C9 10μF NOTE: ALL CONVERTERS’ POWER GROUND CONNECTIONS ARE THROUGH THE EXPOSED PADDLE (EP). LXLED R11 1.4MΩ 22 PVM C7 10μF 1 R4 100kΩ VCCDBST (15V, 30mA) 19, 20 PGSU (EP) C5 1μF VREF D2 PGBST (EP) 27 R5 80kΩ 23 L6 4.7μH R17 100Ω 26 R2 100kΩ R13 604kΩ LXSU 29 R1 402kΩ R3 232kΩ C19 4.7μF L7 4.7μH 32 VSU (5V, 500mA) VCCDINV (-7.5V, 100mA) D3 L1 2μH 31 C3 22μF C18 1μF 16 PVINV 15 LXINV FBSD PGSD (EP) PGLED (EP) EP GND PVZ ONSU ONM 8 LXZ VBATT OR VSU 25 ONBST 37 L4 4.7μH VDDRZ (2.5V, 200mA) C12 10μF ONINV ONZ FBZ PGZ (EP) SDOK C11 1μF 36 ONSD ONLED R15 10Ω C13 10μF R7 150kΩ 3 4 R8 100kΩ R16 100kΩ VBATT 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 ______________________________________________________________________________________