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Product Detailed Parameters
- Description：IC REG CUK ADJ 1A TSOT23-5
- Series：-
- Mfr：Linear Technology
- Package：Bulk
- Function：Step-Up/Step-Down
- Output Configuration：Negative
- Topology：Cuk
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：2.45V
- Voltage - Input (Max)：16V
- Voltage - Output (Min/Fixed)：-1.255V
- Voltage - Output (Max)：-34V
- Current - Output：1A (Switch)
- Frequency - Switching：1.2MHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：SOT-23-5 Thin, TSOT-23-5
- Supplier Device Package：TSOT-23-5
- Grade：-
- Qualification：-
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Overview
The LT1931IS5#TRM is a high-power inverting DC/DC converter IC manufactured by Analog Devices (formerly Linear Technology). It operates with an input voltage range of 2.45V to 16V and generates an adjustable negative output voltage from -1.255V to -34V. The device features a fixed 1.2MHz switching frequency and integrates a 1A internal switch, enabling compact designs using small passive components. Packaged in a TSOT-23-5 surface-mount case, it supports Cuk topology for continuous input and output currents.
Feature Summary
- Integrates a 1A, 36V internal power switch for high current capability within a minimal footprint
- Fixed 1.2MHz switching frequency allows the use of low-profile inductors and capacitors
- Provides low and predictable output noise suitable for sensitive analog circuits
- Includes integrated shutdown functionality to minimize quiescent current during standby
Applications
- Generating local negative supply rails for operational amplifiers
- Powering RS-232 interface transceivers requiring dual polarity voltages
- Biasing sensors and data converters that require negative reference voltages
- Inverting power supplies for portable battery-operated instrumentation
Procurement Notes
Verify the suffix #TRM indicates tape-and-reel packaging when ordering. Confirm the IS5 variant meets industrial temperature specifications if operating outside standard ranges. Ensure the component matches the specific pinout and electrical characteristics defined in the official datasheet before finalizing procurement contracts.
Selection Notes
Select this component when a compact solution is required for generating negative voltages from positive sources. The 1.2MHz frequency balances efficiency with passive component size. Consider the LT1931AIS5 for extended industrial temperature ranges or the LT1930 series if a non-inverting step-up topology is needed instead.
Part Context
This part belongs to the LT1931 family of ThinSOT switching regulators designed for space-constrained applications. It serves as a direct upgrade path for legacy designs previously utilizing larger packages or lower-performance inverting regulators. The device shares functional similarities with the LT1930 but is optimized specifically for inverting topologies.
Replacement Considerations
The LT1931AIS5 is a verified alternative offering identical functionality with an extended industrial temperature range. Designers upgrading from older inverting regulators should verify pin compatibility and ensure the new switch current rating meets load requirements.
