LM3370 - 具有动态电压调节功能的双路同步降压 DC-DC 转换器

LM3370是TI德州仪器公司的一款转换器（集成开关）产品，LM3370是具有动态电压调节功能的双路同步降压 DC-DC 转换器，本站介绍了LM3370的封装应用图解、特点和优点、功能等，并给出了与LM3370相关的TI元器件型号供参考。

LM3370 - 具有动态电压调节功能的双路同步降压 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 LM3370 is a dual step-down DC-DC converter optimized for powering ultra-low voltage circuits from a single Li-Ion battery and input rail ranging from 2.7V to 5.5V. It provides two outputs with 600mA load per channel. The output voltage range varies from 1V to 3.3V and can be dynamically controlled using the I2C-compatible interface. This dynamic voltage scaling function allows processors to achieve maximum performance at the lowest power level. The I2C-compatible interface can also be used to control auto PFM-PWM/PWM mode selection and other performance enhancing features.

The LM3370 offers superior features and performance for portable systems with complex power management requirements. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system efficiency. Internal synchronous rectification enhances the converter efficiency without the use of further external devices.

There is a power-on-reset function that monitors the level of the output voltage to avoid unexpected power losses. The independent enable pin for each output allows for simple and effective power sequencing.

LM3370 is available in a 4mm by 5mm 16-lead non-pullback WSON and a 20-bump DSBGA, 3.0mm x 2.0mm x 0.6mm, package. A high switching frequency—2 MHz (typ)—allows use of tiny surface-mount components including a 2.2µH inductor.

Default fixed voltages for the 2 output voltages combination can be customized to fit system requirements by contacting Texas Instruments.

产品特性

I2C-compatible interface
- VOUT1 = 1V to 2V in 50 mV Steps
- VOUT2 = 1.8V to 3.3V in 100 mV Steps
- Automatic PFM/PWM Mode Switching and Forced PWM Mode for Low Noise Operation
- Spread Spectrum Capability Using I2C
600mA Load Per Channel
2MHz PWM Fixed Switching Frequency (Typ.)
The Bucks Operate 180° Out-of-Phase Timing Offset for Noise and Input Surge Current Abatement
Internal Synchronous Rectification for High Efficiency
Internal Soft Start
Power-on-Reset Function for Both Outputs
2.7V ≤ VIN ≤ 5.5V
Operates from a Single Li-Ion Cell or 3 Cell NiMH/NiCd Batteries and 3.3V/5.5V Fixed Rails
2.2µH Inductor, 4.7µF Input and 10µF Output Capacitor Per Channel
16-lead WSON Package (4 mm x 5 mm x 0.8 mm)
20-Bump DSBGA Package (3.0 mm x 2.0 mm x 0.6 mm)

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