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| 19-4102; Rev 0; 5/08 ABRIDGED Highly Efficient, All-Internal MOSFET, 6-Channel PMIC for 2AA Digital Camera Systems General Description The MAX8858 PMIC provides a complete power-supply solution for digital still cameras (DSCs) and digital video cameras (DVCs). The MAX8858 improves performance, component count, and board space utilization compared to currently available solutions for two AA cell and dualbattery designs. On-chip power MOSFETs provide up to 95% efficiency for critical power supplies. The CCD inverter can operate directly from two AA/NiMH batteries without the use of any additional external components. * Step-up synchronous-rectified DC-DC converter (SU). The MAX8858 is bootstrapped from VVSU. * * MAIN synchronous-rectified step-up DC-DC converter (M) with active discharge for DSP I/O supply voltage. SDZ synchronous-rectified step-down DC-DC converter (SDZ) with active discharge for DSP DDR supply voltage. Low-voltage (down to 1V) synchronous-rectified step-down DC-DC converter (SD) with active discharge for DSP core supply voltage. High-voltage step-up DC-DC converter (CCDBST) for CCD imagers or positive LCD bias supplies. Transformerless inverting DC-DC converter (CCDINV) with active discharge for CCD imagers or negative LCD bias supplies. This converter can connect directly to two AA batteries. Features 95% Efficient Synchronous-Rectified DC-DC Converters Up to 90% Efficient Boost-Buck Operation Up to 85% Efficient, High-Voltage DC-DC Converters Transformerless Inverting Converter with Active Discharge for CCD Preset Power-Up Sequencing for MAIN, SDZ, and SD Converters Inverter Operates Directly from Two AA Batteries Internal Compensation on All Channels True ShutdownTM on All Step-Up Converters Overload Protection Startup into Short Protection Soft-Start for Controlled Inrush Current 100% Duty Cycle on Step-Down Converters 2MHz 5% Switching Frequency 0.1A Shutdown Supply Current All Internal Power MOSFETs MAX8858 * * * Ordering Information PART MAX8858ETJ+ TEMP RANGE -40C to +85C PIN-PACKAGE 32 Thin QFN-EP* Individual ON_ inputs provide independent on/off control for the SU, CCDBST, and CCDINV converters, while dualfunction inputs allow independent on/off control or powerup sequencing of the MAIN, SDZ, and SD converters. The MAX8858 is available in a 5mm x 5mm x 0.8mm, 32-pin thin QFN package and operates over the -40C to +85C extended temperature range. +Denotes a lead-free package. *EP = Exposed pad. Pin Configuration ONM/SEQ FBSU GND REF VSU TOP VIEW DSCs and DVCs PDAs and Portable Media Players LXSU 25 LXSU 26 PVSU 27 INPUT 0.9V TO 5.5V 24 23 22 ONSU 21 20 19 18 FBBST 17 16 15 14 13 LXBST SWBST PVBST PVINV OUTINV LXINV PVZ LXZ Typical Operating Circuit PVBST ONSU ONM/SEQ SU STEP-UP MAIN STEP-UP SD STEP-DOWN VSU 5V VMAIN 3.3V VSD 1.8V VSDZ 2.5V PVSD 28 LXSD 29 PVM 30 LXM 31 LXM 32 + EP = EXPOSED PAD MAX8858 ONBST 12 11 10 9 8 ONINV Applications ONSD/EN1 SDZ STEP-DOWN ONZ/EN2 1 FBM 2 ONSD/EN1 3 FBSD 4 GND 5 FBZ 6 ONZ/EN2 7 FBINV MAX8858 CCDBST CCDINV VCCDBST +15V VCCDINV -7.5V THIN QFN-EP 5mm x 5mm ONBST ONINV True Shutdown is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 1 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 Highly Efficient, All-Internal MOSFET, 6-Channel PMIC for 2AA Digital Camera Systems MAX8858 VBATT R13 100 C16 1F C18 VREF 0.22F 19 L1 2H C2 22F 13 PVINV REF 12 OUTINV 11 LXINV D2 VCCDINV (-7.5V, 100mA) VBATT (1.8V TO 5.5V) C1 22F VSU (5V, 500mA) C3 22F R1 402k C4 22F 25, 26 L6 4.7H LXSU FBINV 7 15 C17 4.7F R11 604k 27 PVSU 21 VSU SWBST R12 100k L5 2.2H MAX8858 LXBST 16 D1 C15 2.2F VREF VCCDBST (15V, 30mA) R9 1.4M 23 FBSU FBBST 18 R10 100k R2 100k C5 1F VBATT VBATT 31, 32 L2 1H C6 22F C7 22F 1 FBM LXM 30 PVM PVZ LXZ 10 9 L4 4.7H C12 10F 4, 20 PVBST 14 VSU C14 1F VMAIN (3.3V, 300mA) R3 23.2k C11 1F VSDZ (2.5V, 200mA) C13 10F R7 150k EP GND R4 10k C8 10F VBATT 28 PVSD FBZ 5 R8 100k VSD (1.8V, 250mA) R5 80k C9 10F C10 10F L3 4.7H 29 LXSD ONSU ONM/SEQ 22 24 2 6 17 8 3 R6 100k FBSD ONSD/EN1 ONZ/EN2 ONBST ONINV Figure 1. MAX8858 Typical Application Circuit 16 ______________________________________________________________________________________ |
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