- Switching frequency from 50 kHz to 1 MHz
- Switching frequency synchronization range 250 kHz to 1 MHz (LM2745 only)
- Start the output load with pre-bias
- The power stage input voltage is from 1V to 14V
- The input voltage in the control phase is from 3V to 6V
- The output voltage can be adjusted down to 0.6V
- The power is well marked and turned off
- Output overvoltage and undervoltage detection
- ± 1.5% feedback voltage with temperature accuracy
- Low-side adjustable current sensing
- Adjustable soft-start
- Tracking and sequencing of shutdown and soft-start pins
- TSSOP-14 package
illustrate
The LM2745/8 is a high speed synchronous buck regulator controller with an accurate feedback voltage accuracy of ± 1.5%. It provides a simple down-conversion output voltage as low as 0.6V. Although rated for the 3 to 6V IC control section, the driver section is designed to accept high input rails up to 14V. The use of adaptive, non-overlapping MOSFET gate drivers helps avoid potential pass-through issues while maintaining high efficiency. ICs are designed as a more cost-effective option with only N-channel MOSFETs driving high-side and low-side positions. Sensing provides a simple, adjustable current to limit the voltage drop of the low-side switch.
The LM2745/8 features a fixed frequency voltage mode PWM control architecture, which is regulated from 50 kHz to 1 MHz with an external resistor. In addition, the LM2745 allows synchronization of external clock signals with switching frequency ranges from 250 kHz to 1 MHz. This wide range of switching frequencies gives flexibility in power supply design with better trade-offs between component size, cost, and efficiency.
Features include load capability start-up for prebiased outputs, soft-start, input undervoltage lockout (UVLO), and power good (based on undervoltage and overvoltage detection). In addition, the IC's shutdown pin can be used to provide a start-up delay, and a soft-start pin can be used to implement accurate tracking with external rail sequencing purposes.
apply
- Convert down from 3.3V
- Cable modem, DSL and ADSL
- Laser printers and inkjet printers
- Low voltage power module
- DSP, ASIC core and I/O
|