LM3686 - 具有集成后置线性稳压器系统和低噪声线性稳压器的降压 DC-DC 转换器

LM3686是TI德州仪器公司的一款转换器（集成开关）产品，LM3686是具有集成后置线性稳压器系统和低噪声线性稳压器的降压 DC-DC 转换器，本站介绍了LM3686的封装应用图解、特点和优点、功能等，并给出了与LM3686相关的TI元器件型号供参考。

LM3686 - 具有集成后置线性稳压器系统和低噪声线性稳压器的降压 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 LM3686 is a step-down DC-DC converter with one integrated very low dropout linear regulator and a low noise linear regulator optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides three outputs with combined load current up to 900 mA over an input voltage range from 2.7V to 5.5V.

The device offers superior features and performance for many applications. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During full-power operation, a fixed-frequency 3 MHz (typ.), PWM mode drives loads from ~70 mA to 600 mA max. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 28 μA (typ.) at light load and system standby. Internal synchronous rectification provides high efficiency.

Three enable pins allow the separate operation of either the DC-DC, post-regulation linear regulator or the linear regulator alone. If the DC-DC is not enabled during startup of the post-regulation linear regulator, a parallel small pass transistor supplies the linear regulator from VBATT with maximal 50 mA. In the combined operation where both enables are raised together, the small pass transistor is deactivated and the big pass transistor provides 350 mA output current. In shutdown mode (Enable pins pulled low), the device turns off and reduces battery consumption to 2.5 μA (typ.).

The LM3686 is available in a 12-bump DSBGA package. A high-switching frequency of 3 MHz (typ.) allows the use of a few tiny surface-mount components. Only six external surface-mount components, an inductor and five ceramic capacitors, are required to establish a 15.66 mm2 total solution size.

产品特性

DC-DC REGULATOR

VOUT_DCDC = 1.2V to 2.5V (in 100 mV Steps - Factory Programmed)
600 mA Maximum Load Capability (LILO = OFF)
3 MHz PWM Fixed Switching Frequency (Typ.)
Automatic PFM/PWM Mode Switching
Internal Synchronous Rectification for High Efficiency
Internal Soft Start

DUAL RAIL LINEAR REGULATOR: LILO

Load Transients < 50 mV Peak Typ.
Line Transients < 1 mV Peak Typ.
VOUT_LILO = 0.7V to 2.0V (in 50 mV Steps - Factory Programmed)
70 µA Typical IQ From VIN_LILO
350 mA Maximum Load Capability (Large FET)

LINEAR REGULATOR: LDO

Load Transients < 80 mV Peak Typ.
Line Transients < 1 mV Peak Typ.
VOUT_LDO = 1.5V to 3.3V (in 100 mV Steps - Factory Programmed)
50 µA Typical IQ
300 mA Maximum Load Capability

COMBINED GLOBAL FEATURES

VBATT ≥ VOUT_LILO + 1.5V or 2.7V, Whichever is Higher
900 mA Maximum Combined Load Capability
Operates From a Single Li-Ion Cell or 3 Cell NiMH/NiCd Batteries
Only Six Tiny Surface-mount External Components Required (One Inductor, Five Ceramic Capacitors)
12–bump DSBGA
100 µA Iq From VBATT
15.66 mm2 Total Solution Size

下面可能是您感兴趣的TI德州仪器公司转换器（集成开关）元器件

TI公司产品现货专家，订购TI公司产品不限最低起订量，TI芯片大陆现货即时发货，香港库存3-5天发货，海外库存7-10天发货

寻找全球TI代理商现货货源 - TI公司（德州仪器）电子元件在线订购