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Product Detailed Parameters
- Description：IC REG CTRLR BUCK 8SOIC
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Output Type：Transistor Driver
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：3.5V ~ 14V
- Frequency - Switching：-
- Duty Cycle (Max)：100%
- Synchronous Rectifier：No
- Clock Sync：No
- Serial Interfaces：-
- Control Features：Current Limit, Enable
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SO
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Overview
The LTC1147IS8-5#PBF is a high-efficiency step-down switching regulator controller manufactured by Analog Devices Inc. It operates within an input voltage range of 3.5V to 16V and provides a fixed 5V output. The device utilizes current-mode control with a 400kHz switching frequency and features automatic Burst Mode operation for maintaining efficiency at low load currents. It is housed in an 8-lead SOIC package and supports transistor driver outputs for external power switches.
Feature Summary
- Automatic Burst Mode operation maintains high efficiency at low output currents
- Current-mode control architecture for stable regulation
- Fixed 5V output configuration for standard logic supply applications
Applications
- Portable computer power supplies
- Hand-held equipment battery management
- Precision constant current sources
Procurement Notes
Verify the specific suffix IS8 indicates the SOIC-8 narrow package variant distinct from PDIP versions. Confirm RoHS3 compliance status through official manufacturer documentation prior to integration. Ensure design compatibility with the 400kHz switching frequency requirements of the target application circuit.
Selection Notes
Select this component when a fixed 5V buck controller is required with integrated low-load efficiency optimization. The SOIC-8 package suits surface-mount designs where space is constrained compared to through-hole alternatives. Verify that the external MOSFET selection aligns with the controller's drive capabilities and the 400kHz operating frequency.
Part Context
This part 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 the CN8 (PDIP) and IS8 (SOIC) packages. The -5 suffix specifically denotes the 5V fixed output version designed for general-purpose DC-DC conversion tasks.
Replacement Considerations
LTC1147CN8-5#PBF offers identical electrical performance in a PDIP-8 package. LTC1147IS8-5#TR provides the same SOIC-8 form factor but in tape-and-reel packaging for automated assembly.
