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
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.
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