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Product Detailed Parameters
- Description：IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck, SEPIC
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：4.3V
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：1.21V
- Voltage - Output (Max)：12.9V
- Current - Output：4.5A (Switch)
- Frequency - Switching：500kHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Supplier Device Package：DDPAK-7
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Overview
The LT1959IR#PBF is a monolithic buck mode switching regulator optimized for lower output voltage applications. It operates at a fixed 500kHz frequency and delivers up to 4.5A of switch current. The device supports an input voltage range from 4V to 15V with an adjustable positive output starting at 1.21V. It features a TO-263-8 (D2PAK) package with thermal performance suitable for high-current designs. The unit functions identically to the LT1506 but targets specific low-voltage requirements.
Feature Summary
- Monolithic buck mode switching regulator architecture
- Optimized for lower output voltage applications
- Fixed 500kHz switching frequency operation
- High current capability up to 4.5A
Applications
- Low voltage point-of-load regulation
- Battery-powered systems requiring efficient step-down conversion
- Industrial equipment power supplies
- Communication infrastructure power management
Procurement Notes
Verify the suffix #PBF indicates lead-free RoHS compliance when ordering. Confirm the IR suffix corresponds to the industrial temperature range specifications. Ensure the D2PAK package variant matches your PCB footprint requirements. Cross-reference the manufacturer's latest datasheet for any pinout or electrical specification updates prior to final procurement.
Selection Notes
Select this component when a robust 4.5A buck regulator is needed for inputs between 4V and 15V. It is functionally identical to the LT1506 but specifically tuned for lower output voltages. Consider the TO-263-8 package for its thermal dissipation capabilities in space-constrained high-power designs. Verify that the 500kHz frequency aligns with your EMI and inductor size constraints.
Part Context
This part belongs to the LT1959 family of switching regulators manufactured by Analog Devices Inc. It serves as a direct functional replacement for the LT1506, offering similar performance characteristics while being optimized for different output voltage ranges. The series is designed for applications requiring reliable, high-current DC-DC conversion in compact form factors.
Replacement Considerations
The LT1959 is functionally identical to the LT1506. When substituting, verify that the target application's output voltage requirements align with the LT1959's optimization for lower voltages. Ensure compatibility with the TO-263-8 package if physical interchangeability is required.
