DC-DC Controller
Single Buck Controller
uP1540P
5V/12V Synchronous-Rectified Buck Controller
Datasheets PDF
General Description
The uP1540 is a compact synchronous-rectified buck controller specifically designed to operate from 5V or 12V supply voltage and to deliver high quality output voltage as low as 0.8V. The uP1540 adopts proprietary RCOTTM technology, providing flexible selection of output LC filter and excellent transient response to load and line change. The uP1540 supports both tracking mode and stand-alone mode operation.
This controller integrates internal MOSFET drivers that support 12V+12V or 5V+19V bootstrapped voltage for high efficiency power conversion. The bootstrap diode is builtin to simplify the circuit design and minimize external part count.
Other features include internal soft start, over/under voltage protection, over current protection and shutdown function. With aforementioned functions, this part provides customers a compact, high efficiency, well-protected and cost-effective solutions. This part is available in WDFN3x3-10L package.
Pin Configuration & Typical Application Circuit
Feature
- Operates from 5V or 12V Supply Voltage
- 3.3V to 12V VIN Input Range
- 0.8V VREF with 1.0% Accuracy
- Support VCC = 5V, VIN = 19V
- Support Stand-Alone and Tracking Mode Operation
- Offset Voltage Tuning
- Compensated Constant On Time Operation
- Quasi Constant Frequency Operation
- Fast Transient Response
- Smooth Mode Transition
- Lossless, Adjustable Over Current Protection
- Uses Lower MOSFET RDS(ON)
- Internal Soft Start
- Over Voltage and Under Voltage Protection
- Integrated Bootstrap Diode
- WDFN3x3-10L Package
- RoHS Compliant and Halogen Free
Application
- Power Supplies for Microprocessors or Subsystem Power Supplies
- Cable Modems, Set Top Boxes, and DSL Modems
- Industrial Power Supplies; General Purpose Supplies
- 5V or 12V Input DC-DC Regulators
- Low-Voltage Distributed Power Supplies