MAX8815A

The MAX8815A DC-DC step-up converter is a high-efficiency,low quiescent current, synchronous step-up converter with True Shutdown™ and inrush-current limiting.The MAX8815A generates any output voltage from 3.3V to 5V from a 2-cell NiMH/NiCd or a single-cell Li+/Li polymer battery.

Features of the MAX8815A are:(1)up to 97% efficiency with internal synchronous rectifier; (2)low 30A quiescent current; (3)guaranteed 500mA output current at VOUT = 5V from 1.8V input; (4)guaranteed 1A output current at 5V from 2.5V input; (5)low-noise constant frequency operation (FPWM mode); (6)2MHz PWM switching frequency; (7)preset (5V) or adjustable output; (8)controlled current in soft-start limits inrush current; (9)true shutdown; (10)internal compensation; (11)overload/short-circuit protection; (12)0.1A shutdown current; (13)thermal shutdown; (14)compact 10-pin, 3mm x 3mm TDFN package.The MAX8815A uses two modes of operation. The first mode of operation (normal) uses only 30A (typ) quiescent current and allows the converter to switch only when needed at no load and light loads. Under moderate and heavy loads (typically above 90mA), the MAX8815A uses a fixed-frequency pulse-width modulation (PWM) technique.

The absolute maximum ratings of the MAX8815A can be summarized as:(1)OUTS, BATT to GND:-0.3V to +6V;(2)storage temperature range:-65 to +150;(3)junction temperature:-40 to 150;(4)operating temperature range:-40 to 85;(5)PGND (EP) to AGND:-0.3V to +0.3V;(6)LX continuous current:2.75A.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 MAX8815A switches at a 2MHz frequency, allowing for tiny external components. Internal compensation further reduces the external component count in cost and space-sensitive applications. The MAX8815A is optimized for use in DSC and other applications requiring low quiescent current for maximum battery life.

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