MAX8857A

The MAX8857A PMIC provides a complete power-supply solution for digital still cameras (DSCs) and digital video cameras (DVCs). The MAX8857A improves performance, component count, and board space utilization compared to currently available solutions for 2 AA cell and dual-battery designs. On-chip power MOSFETs provide up to 95% efficiency for critical power supplies. The CCD inverter can operate directly from 2 AA/NiMH batteries without the use of any additional external components.

Features of the MAX8857A are:(1)95% efficient synchronous-rectified DC-DC converters; (2)90% efficient boost-buck operation; (3)up to 85% efficient, high-voltage DC-DC converters; (4)inverter operates directly from 2 AA batteries; (5)internal compensation on all channels; (6)overload protection; (7)startup into short protection; (8)soft-start for controlled startup current; (9)100% duty cycle on step-down converters; (10)regulated current output for up to 6 white LEDs; (11)PWM dimming of WLED current; (12)adjustable led overvoltage protection up to 27V; (13)transformerless inverting converter for CCD; (14)1¦ÌA shutdown supply current; (15)CCD voltage sequencing; (16)all internal Power MOSFETs; (17)SDOK power-OK indicator.

The absolute maximum ratings of the MAX8857A can be summarized as:(1)pin-package:40 Thin QFN-EP* 5mm x 5mm x 0.8mm;(2)storage temperature range:-65 to +150.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods may affect device reliability.The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).