19-4092; Rev 0; 5/08
EVALUATION KIT AVAILABLE
1A, 97% Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown
www.datasheet4u.com
General Description
Features
♦ Up to 97% Efficiency with Internal Synchronous Rectifier ♦ Low 30µA Quiescent Current ♦ Guaranteed 500mA Output Current at VOUT = 5V from 1.8V Input ♦ Guaranteed 1A Output Current at 5V from 2.5V Input ♦ Low-Noise Constant Frequency Operation (FPWM Mode) ♦ 2MHz PWM Switching Frequency ♦ Preset (5V) or Adjustable Outpu.
Step-Up Converter
19-4092; Rev 0; 5/08
EVALUATION KIT AVAILABLE
1A, 97% Efficiency, 30µA Quiescent Current Step-Up Converter with True Shutdown
www.datasheet4u.com
General Description
Features
♦ Up to 97% Efficiency with Internal Synchronous Rectifier ♦ Low 30µA Quiescent Current ♦ Guaranteed 500mA Output Current at VOUT = 5V from 1.8V Input ♦ Guaranteed 1A Output Current at 5V from 2.5V Input ♦ Low-Noise Constant Frequency Operation (FPWM Mode) ♦ 2MHz PWM Switching Frequency ♦ Preset (5V) or Adjustable Output ♦ Controlled Current in Soft-Start Limits Inrush Current ♦ ♦ ♦ ♦ True Shutdown Internal Compensation Overload/Short-Circuit Protection 0.1µA Shutdown Current
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. The MAX8815A uses two modes of operation. The first mode of operation (normal) uses only 30µA (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. This mode allows maximum efficiency at light loads. The second mode of operation is a fixed-frequency forced-pulse-width modulation (FPWM) mode where the converter switches at a fixed frequency irrespective of the lo.