LM3670MF-1.8EV

用于超低电压电路的微型降压 DC-DC 转换器

LM3670MF-1.8EV

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概述

The LM3670 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. The LM3670 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 350 mA load current, over an input voltage range from 2.5V to 5.5V. There are several different fixed voltage output option available as well as an adjustable output voltage version. This device offers superior features and performance for mobile phones and similar portable applications with complex power management systems.

特性

V_out = adj (0.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V
2.5V less than or equal to V_in less than or equal to 5.5V
1.5 microA typical quiescent current
350 mA maximum load capability
1 MHz PWM fixed switching frequency (typ.)
Automatic PFM/PWM mode switching
Available in fixed output voltages as well as an adjustable version
SOT23-5 package
Low drop out operation - 100% duty cycle mode
Internal synchronous rectification for high efficiency
Internal soft start
0.1 microA typical shutdown current
Operates from a single Li-Ion cell or 3 cell NIMH/NiCd batteries
Only three tiny surface-mount external components required (one inductor, two ceramic capaitors)
Current overload protection