MAX1800 Datasheet | Maxim Integrated

Features o +0.7V to +5.5V Input Voltage Range o Main DC-DC Converter 95% Efficiency +2.7V to +5.5V Adjustable Output Voltage 1.5A Load Current o Unmitted Gain Block for Linear Regulator o Three Independent Auxiliary Step-Up Controllers Adjustable Maximum Duty Cycle o Oscillator and Reference Outputs to Drive External Slave Controllers (MAX1801) o Power-Ready Output o Up to 1MHz Switching Frequency o 1µA Supply Current in Shutdown Mode o Internal Soft-Start Control o Overload Protection for all DC-DC Converters o pact 32-Pin TQFP Package (5mm x 5mm body) General Description The MAX1800 provides a plete power-supply solution for digital still cameras and video cameras. The device integrates a high-efficiency main step-up DC-DC converter, three auxiliary step-up controllers, and an unmitted gain block that drives an external P-channel MOSFET for a linear regulator. The MAX1800 is targeted for applications that use either two or three primary cells or a single lithium-ion (Li+) battery. The main DC-DC converter accepts inputs from +0.7V to +5.5V and regulates a resistor-adjustable output from 2.7V to 5.5V. It uses an internal synchronous rectifier to regulate the output with 95% efficiency. An adjustable operating frequency facilitates designs for optimum size, cost, and efficiency. The auxiliary step-up controllers can be used to power a digital camera’s CCD, LCD, and backlight. The MAX1800 also features expandability by supplying power, oscillator signal, and reference to the MAX1801, a low-cost slave DC-DC controller that supports step-up, SEPIC, and flyback configurations. The MAX1800 is available in a space-saving 32-pin TQFP package (5mm x 5mm body), and the MAX1801 is available in an 8-pin SOT package. An evaluation kit (MAX1800EVKIT) featuring both devices is available to expedite designs. Ordering Information PART MAX1800EHJ TEMP. RANGE -40°C to +85°C PIN-PACKAGE 32 TQFP ________________________Applications Digital Still Cameras Digital Video...