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Product Detailed Parameters
- Description：IC REG CUK ADJ 1A TSOT23-5
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR)
- 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 (TA)
- Mounting Type：Surface Mount
- Package / Case：SOT-23-5 Thin, TSOT-23-5
- Supplier Device Package：TSOT-23-5
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Overview
The LT1931IS5#TRM is a negative Cuk switching regulator IC manufactured by Analog Devices Inc. It operates with an input voltage range of 2.45V to 16V and provides an adjustable negative output from -1.255V to -34V. The device supports a maximum switch current of 1A and features a fixed switching frequency of 1.2MHz. It is housed in a TSOT-23-5 surface-mount package and is rated for an operating temperature range of -40°C to 85°C.
Feature Summary
- Implements Cuk topology to provide non-isolated negative voltage conversion with continuous input and output currents.
- Integrates a high-voltage internal power switch capable of handling up to 1A of switch current.
- Utilizes a fixed 1.2MHz switching frequency to minimize the size of external passive components.
Applications
- Generating negative supply rails for operational amplifiers and analog circuits
- Powering RS-232 interface transceivers requiring dual polarity supplies
- Biasing photodiodes and other sensors requiring reverse voltage
Procurement Notes
Verify the suffix #TRM indicates tape-and-reel packaging distinct from bulk or cut tape options. Confirm the IS5 grade matches the required industrial temperature range of -40°C to 85°C. Ensure the order quantity aligns with reel specifications if full reels are mandatory for production. Cross-reference the manufacturer part number against distributor databases to confirm current availability status.
Selection Notes
Select this component when a compact solution for generating negative voltages is required without using inductive flyback topologies. The Cuk architecture offers lower input and output ripple compared to standard buck-boost converters. Consider the 1.2MHz frequency trade-off between component size and electromagnetic interference. Verify that the load current does not exceed the 1A internal switch limit under all operating conditions.
Part Context
This part belongs to the LT1931 family of negative Cuk regulators, designed for space-constrained applications. It serves as the industrial temperature variant (IS5) within the series, complementing commercial grades like the ES5. The family allows designers to replace bulky transformer-based solutions with small SOT-23 footprints while maintaining efficient DC-DC conversion capabilities.
Replacement Considerations
LT1931ES5#TRPBF shares identical electrical characteristics but differs in operating temperature range and packaging format.
FAQ
What is the primary advantage of the Cuk topology used in this IC?
The Cuk topology provides continuous current at both the input and output terminals, resulting in significantly lower ripple compared to traditional buck-boost converters.
How does the switching frequency affect external component selection?
The fixed 1.2MHz frequency allows for the use of smaller inductors and capacitors, reducing the overall PCB footprint compared to lower-frequency regulators.
