LTC1844ES5-SD#TRPBF Analog Devices Adjustable VLDO Regulator, TSOT-23-5 - Individual Item
Manufacturer: Analog Devices Inc.
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LTC1844ES5-SD#TRPBF Analog Devices Adjustable VLDO Regulator, TSOT-23-5 - Individual Item
Overview
LTC1844ES5-SD#TRPBF from Analog Devices is a micropower, low-noise very-low-dropout linear regulator for compact power-management designs. This adjustable positive regulator provides one output with up to 150 mA current capability in a TSOT-23-5 package, making it useful where board area, quiescent current, noise, and dropout voltage all matter.
The LTC1844 family is commonly selected for battery-powered, portable, instrumentation, and embedded systems that need a clean low-current rail from a limited input supply. The adjustable SD version supports an output range from 1.25 V to 6 V, allowing designers to set the output with external feedback components while retaining the low-noise and enable-control behavior described in the family datasheet.
Sale Basis
Order quantity 1 equals one individual LTC1844ES5-SD#TRPBF component. This listing is prepared for individual component purchasing rather than as a sealed full reel package.
Key Benefits
- Adjustable positive VLDO regulator for low-power regulated rails.
- 150 mA output current capability supports many logic, analog, sensor, and portable-device loads.
- Wide 1.6 V to 6.5 V input range supports common battery and board-level supplies.
- Adjustable 1.25 V to 6 V output range gives designers flexibility across multiple rail targets.
- Low-noise regulator architecture is useful for analog, RF-adjacent, and measurement-sensitive circuits.
- TSOT-23-5 surface-mount package reduces board space while keeping a standard production footprint.
Product Features
- Micropower VLDO linear regulator with positive adjustable output.
- One regulator output rated for 150 mA.
- Maximum input voltage listed at 6.5 V.
- Adjustable output range listed from 1.25 V to 6 V.
- Maximum dropout voltage listed at 0.2 V at 150 mA for this adjustable configuration.
- Quiescent current listed at 80 uA in distributor product data.
- PSRR listed at 50 dB at 120 Hz.
- Enable control is available through the shutdown pin.
- Protection features include over-current, over-temperature, reverse-polarity, and short-circuit protection in the listed product attributes.
Technical Specifications
| Manufacturer Part Number | LTC1844ES5-SD#TRPBF |
|---|---|
| Manufacturer | Analog Devices Inc. |
| Product Category | Power Management IC, Linear / Low Dropout Regulator |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Output Current | 150 mA |
| Input Voltage Range | 1.6 V to 6.5 V family range |
| Voltage Input Max | 6.5 V |
| Output Voltage Min | 1.25 V |
| Output Voltage Max | 6 V |
| Voltage Dropout Max | 0.2 V at 150 mA listed |
| Quiescent Current | 80 uA listed |
| PSRR | 50 dB at 120 Hz listed |
| Control Features | Enable / shutdown |
| Operating Temperature | -40 C to 125 C |
| Mounting Type | Surface mount |
| Package / Case | SOT-23-5 Thin, TSOT-23-5 |
| Supplier Device Package | TSOT-23-5 |
| Sale Basis | Individual component |
Design and Selection Notes
When using LTC1844ES5-SD#TRPBF, confirm the input supply range, output setpoint, dropout margin, load current, capacitor selection, and thermal conditions against the datasheet. Because this is an adjustable regulator, the feedback resistor values and layout around the feedback node should be reviewed carefully to preserve regulation accuracy and noise performance.
For substitution, compare the exact output type, output range, dropout voltage, shutdown behavior, pinout, package, operating temperature, and stability requirements. A fixed-output LTC1844 variant may not replace the adjustable SD version without schematic changes, and a different TSOT-23-5 LDO may require different capacitor ESR, enable polarity, or feedback configuration.
Applications
- Battery-powered embedded systems that need a low-current regulated rail.
- Portable instruments, handheld devices, and sensor modules.
- Low-noise analog support rails for measurement and signal-conditioning circuits.
- Microcontroller, logic, and interface supply rails within the 150 mA load range.
- Compact boards where TSOT-23-5 package size is preferred.
- Repair or production support for designs already qualified around the LTC1844 family.
Sourcing and Documentation Notes
The product image is an original DigiKey representative package image for the TSOT-23-5 package and was uploaded without editing. The attached Product Specification PDF is a validated LTC1844 family datasheet copy that contains the LTC1844 match term. Buyers should review the datasheet for absolute maximum ratings, electrical characteristics, pin functions, recommended capacitor values, thermal limits, and layout guidance before use.
FAQ
What is LTC1844ES5-SD#TRPBF best suited for?
It is best suited for compact low-power systems that need a low-noise, very-low-dropout adjustable linear regulator with up to 150 mA output current.
What makes the LTC1844 useful in battery-powered designs?
Analog Devices lists operation from input voltages as low as 1.6 V, low supply current, and shutdown current in the nanoamp range, making the family useful for portable and battery-powered circuits.
What output voltage range can the adjustable version support?
The adjustable LTC1844 version supports an output range from 1.25 V to 6 V when the feedback network and operating conditions follow the datasheet.
How should dropout voltage be evaluated?
Check dropout at the actual load current, output voltage, and temperature. ADI highlights very low dropout behavior, but the final margin depends on the selected operating point.
What capacitor choices matter?
The LTC1844 family is listed as stable with 1 uF output capacitance and ceramic capacitors. Confirm input/output capacitor value, ESR, placement, and startup behavior in the datasheet.
What does order quantity 1 include?
Order quantity 1 includes one individual LTC1844ES5-SD#TRPBF component.
Can a fixed-output LTC1844 replace the SD adjustable version?
Only after reviewing schematic changes, feedback network removal, output voltage target, pinout, suffix, and package. Fixed-output and adjustable variants are not automatically interchangeable.
What protection features should designers consider?
ADI lists output current limit, reverse-battery and reverse-current protection, short-circuit protection, and thermal overload protection. Verify how those protections behave in the final circuit.
Where is this regulator commonly used?
Typical applications include portable instruments, battery-powered systems, wireless cards, cellular devices, PDAs, notebook computers, and low-noise analog support rails.
Where can I find the datasheet?
Use the attached Product Specification PDF for LTC1844 electrical characteristics, capacitor guidance, pin functions, package information, and application circuits.
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