LM3670 - 用于超低电压电路的微型降压 DC-DC 转换器

LM3670是TI德州仪器公司的一款转换器（集成开关）产品，LM3670是用于超低电压电路的微型降压 DC-DC 转换器，本站介绍了LM3670的封装应用图解、特点和优点、功能等，并给出了与LM3670相关的TI元器件型号供参考。

LM3670 - 用于超低电压电路的微型降压 DC-DC 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品描述

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 options available as well as an adjustable output voltage version.

The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During full-power operation, a fixed-frequency 1 MHz (typ). PWM mode drives loads from ∼70 mA to 350 mA max, with up to 95% efficiency. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 15 µA (typ) during light current loads and system standby. Internal synchronous rectification provides high efficiency (90 to 95% typ. at loads between 1 mA and 100 mA). In shutdown mode (Enable pin pulled low) the device turns off and reduces battery consumption to 0.1µA (typ.).

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Description

The LM3670 is available in a SOT-23-5 package. A high switching frequency - 1 MHz (typ) - allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required.

产品特性

VOUT = Adj (0.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V
2.5V ≤ VIN ≤ 5.5V
15 µA 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
SOT-23-5 Package
Low Drop Out Operation - 100% Duty Cycle Mode
Internal Synchronous Rectification for High Efficiency
Internal Soft Start
0.1 µA Typical Shutdown Current
Operates from a Single Li-Ion Cell or 3 Dell NiMH/NiCd Batteries
Only Three Tiny Surface-Mount External Components Required (One Inductor, Two Ceramic Capacitors)
Current Overload Protection

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