LM3370
LM3370 is Dual Synchronous Step-Down DC-DC Converter manufactured by National Semiconductor.
Description
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 600 m A load per channel. The output voltage range varies from 1V to 3.3V and can be dynamically controlled using the I2C patible interface. This dynamic voltage scaling function allows processors to achieve maximum .. performance at the lowest power level. The I2C patible 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 plex power management requirements. Automatic intelligent switching between PWM lownoise 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 4 mm by 5 mm 16-lead non-pullback LLP and a 20-Bump micro SMD, 3.0 mm x 2.0 mm x 0.6 mm, package. A high switching frequency- 2 MHz (typ)- allows use of tiny surface-mount ponents including a 2.2 µH inductor. Default fixed voltages for the 2 output voltages bination can be customized to fit system requirements by contacting National Semiconductor Corporation.
Features
- I2C patible interface
- VOUT1 = 1V to 2V in 50 m V steps
- VOUT2 = 1.8V to 3.3V in 100 m V steps
- Automatic PFM/PWM mode switching & Forced PWM mode for low noise operation
- Spread Spectrum capability using I2C 600 m A load per channel 2 MHz PWM fixed switching frequency (typ.) 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 Ni...
