LTC1147CN8-3.3#PBF

Overview

The LTC1147CN8-3.3#PBF is a high-efficiency step-down switching regulator controller manufactured by Analog Devices Inc. It operates with an input voltage range of 3.5 V to 16 V and provides a fixed output voltage of 3.3 V. The device supports an output current of 700 mA and features automatic Burst Mode operation for maintaining efficiency at low load currents. It utilizes a buck topology with a switching frequency of 400 kHz. The component is housed in an 8-pin PDIP package, suitable for through-hole mounting, and functions within a temperature range of 0°C to +70°C.

Feature Summary

• Features automatic Burst Mode operation to maintain high efficiency during low output current conditions
• Integrates a 400 kHz fixed-frequency PWM control architecture for compact external component sizing
• Includes internal soft-start circuitry to limit inrush current during power-up sequences

Applications

• Battery-powered portable equipment requiring extended runtime
• Industrial control systems utilizing 12V or 24V bus architectures
• Embedded computing modules needing stable 3.3V logic supply rails

Procurement Notes

Verify the specific suffix designation against official Analog Devices documentation to confirm pinout compatibility and thermal characteristics. Ensure that the selected variant matches the required operating temperature range and package style for your PCB layout. Cross-reference the manufacturer's latest datasheet revision to validate any updates to electrical specifications or recommended external component values before finalizing procurement orders.

Selection Notes

Select this controller when a non-synchronous buck solution is preferred for cost-sensitive designs. The fixed 400 kHz frequency allows for smaller inductors compared to lower-frequency alternatives. Consider the 700 mA output capability relative to peak load demands. Verify that the external MOSFETs selected can handle the required current and voltage stresses associated with the 16 V maximum input specification.

Part Context

This component belongs to the LTC1147 series of high-efficiency step-down switching regulator controllers. The series includes variants with different output voltages and package options, such as SOIC-8 and PDIP-8. These controllers are designed to replace linear regulators in applications where efficiency and thermal management are critical constraints.

Replacement Considerations

Direct replacements include other parts from the LTC1147 family with compatible output voltages, such as the LTC1147CN8-5#PBF for 5V outputs. Verify pin-to-pin compatibility if substituting with different package styles like the CS8 variant.