peculiarity
2 C compatible interface
V OUT1 = 1V to 2V in 50 mV steps
V OUT2 = 1.8V to 3.3V in the 100 mV range
Automatic PFM/PWM mode switching and forced PWM low-noise operation mode
Spread spectrum capability, using Comet I2
600 mA load per channel
2 MHz PWM fixed switching frequency (typical)
High efficiency internal synchronous rectification
Internal soft start
Power-on reset function, two outputs
2.7V ≤ V IN ≤ 5.5V
Works from a single Li-ion battery or 3 NiMH/NiCd batteries and 3.3V/5.5V fixed rails
2.2μH inductor, 4.7μF input per channel and 10μF output capacitor
16-pin LLP package (4mm x 5mm× 0.8mm)
20 solder ball micro SMD package (3.0mm× 2.0mm×0.6mm)
illustrate
The LM3370 is a dual, step-down DC-DC converter optimized for ultra-low voltage circuitry powered from a single Li-Ion battery ranging from 2.7V to 5.5V input rails. It provides a load of 600 mA with two outputs per channel. The output voltage varies from 1V to 3.3V and can be dynamically controlled using the I2C-compatible interface. This dynamic voltage scaling feature allows the processor to achieve the highest performance and lowest power consumption. The 2 C compatible interface can also be used to control automatic PFM-PWM/PWM mode selection and other performance enhancements.
The LM3370 provides superior performance and performance for portable systems with complex power management requirements. Intelligent PWM low noise and PFM low current modes automatically switch between improved system efficiency. Internal synchronous rectification improves the efficiency of the converter without the use of further external devices.
There is a power-on reset function that monitors the output voltage level to avoid accidental power loss losses. The enable pins for each output independently allow for simple and efficient sequencing of the power supply.
LM3370 is a 4mm, 5mm 16-pin non-stretch LLP and 20 solder ball micro SMD, 3.0mm× 2.0mm× 0.6mm, packaged. The high switching frequency of 2 MHz (typical) allows the use of tiny surface mount components, including 2.2μH inductors.
The fixed voltage defaulting to 2 output voltage combinations can be customized to suit the requirements of the system, contacted by the national semiconductor company.
apply
Baseband processor
Application Processor (Video, Audio)
I/O power supply
FPGA power supply and CPLD