DESCRIPTION
The LM2574HVN-15 series of regulators are monolithic integrated circuits that provide all the active functions for a stepdown (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.
The LM2574HVN-15 series offers a high-efficiency replacement for popular three-terminal linear regulators. Because of its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking needed.
A standard series of inductors optimized for use with the LM2574HVN-15 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 μA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.
FEATURES
· 3.3V,5V,12V,15V, and adjustable output versions
· Adjustable version output voltage range,1.23V to 37V(57V for HV version)±4% max over line and load conditions
· Guaranteed 0.5A output current
· Wide input voltage range,40V, up to 60V for HV version
· Requires only 4 external components
· 52 kHz fixed frequency internal oscillator
· TTL shutdown capability, low power standby mode
·High efficiency
·Uses readily available standard inductors
·Thermal shutdown and current limit protection
APPLICATIONS
·Simple high-efficiency step-down(buck) regulator
·Efficient pre-regulator for linear regulators
·On-card switching regulators
·Positive to negative converter(Buck-Boost)
Feature
- 3.3-V, 5-V, 12-V, 15-V, and Adjustable Output Versions
- Adjustable Version Output Voltage Range: 1.23 V to 37 V (57 V for HV version) ±4% Maximum Over Line and Load Conditions
- Specified 0.5-A Output Current
- Wide Input Voltage Range: 40 V, up to 60 V for HV Version
- Requires Only 4 External Components
- 52-kHz Fixed-Frequency Internal Oscillator
- TTL Shutdown Capability, Low-Power Standby Mode
- High Efficiency
- Uses Readily Available Standard Inductors
- Thermal Shutdown and Current-Limit Protection
- Create a Custom Design Using the LM2574 With the WEBENCH Power Designer
(Picture: Pinout)
