The MAX857ESA+ is an adjustable output step up DC to DC converter in 8 pin NSOIC package. It is a high-efficiency, CMOS, step up DC to DC switching regulator for small, low input voltage or battery-powered systems. The MAX857 adjustable versions accept 0.8V to 6.0V input voltages and generate higher adjustable output voltages in the 2.7V to 6.0V range. Typical efficiency is greater than 85%. It combines ultra-low quiescent supply current and high efficiency to give maximum battery life. An internal MOSFET power transistor permits high switching frequencies. This benefit, combined with internally set peak inductor current limits, permits the use of small, low-cost inductors. This device is used in 3.3V to 5V step-up conversion, palmtop computers, personal data communicators/computers, medical instrumentation, 2cell & 3cell battery-operated equipment and glucose meters.
- Input supply voltage range from 0.8V to 6V
- Start-up supply voltage range from 0.8V
- Quiescent current is 25μA
- Shutdown mode current is 1μA
- 500mA peak inductor current limit
- Switching frequency is 500KHz
- 1.5% reference tolerance over temperature
- Low battery detector (LBI/LBO)
电源管理, 便携式器材
(EN)
