Analog Devices Inc. LTC1517CS5-5#TRMPBF

Overview

LTC1517CS5-5#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower regulated 5V charge pump DC/DC converter in a 5-pin SOT-23 package. It delivers ±4% regulated 5V output from 2.7V–5V input, draws only 6µA typical no-load supply current, supports up to 20mA output at VIN ≥ 3V, and operates at 800kHz without inductors - ideal for space-constrained battery-powered handheld instruments and PCMCIA supplies.

For engineers reviewing the LTC1517CS5-5#TRMPBF datasheet, LTC1517CS5-5#TRMPBF pinout, LTC1517CS5-5#TRMPBF application, or LTC1517CS5-5#TRMPBF equivalent, key selection criteria include ultralow quiescent current, SOT-23 footprint compatibility, regulated 5V output tolerance, thermal shutdown behavior, and flying capacitor requirements for minimal external components.

Technical Context

The LTC1517CS5-5#TRMPBF implements a Burst Mode™ switched-capacitor voltage doubler architecture with internal 1.25V reference and resistor divider feedback. Regulation is achieved via hysteresis-based comparator control of the 800kHz oscillator, enabling charge pump bursts only when VOUT droops below the lower trip point.

It integrates short-circuit protection with indefinite VOUT-to-GND survival and thermal shutdown that cycles between ~160°C disable and ~145°C re-enable thresholds. The device requires only one 0.1µF flying capacitor and two ≥3.3µF low-ESR bypass capacitors at VIN and VOUT for full operation.

Key Specifications

Pinout & Package

Package: 5-lead plastic SOT-23 (SC-74A), 2.80–3.00mm × 1.90mm × 1.10mm, 256°C/W θ_JA, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar regulated charge pump applications.

Compared with LTC1517CS5-5#TRMPBF, LTC1522CMS8-5#TRPBF adds controllable shutdown but increases footprint and BOM complexity, while MAX680ESA+ eliminates regulation entirely - making LTC1517CS5-5#TRMPBF the optimal choice for space-limited, battery-sensitive 5V-regulated applications requiring zero external control signals.

Availability

LTC1517CS5-5#TRMPBF is available at Aetrix Electronics and suitable for cellular telephones, handheld instruments, and PCMCIA supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC1517CS5-5#TRMPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous reliability testing and automotive-grade qualification paths.

The LTC1517CS5-5#TRMPBF belongs to Linear's micropower charge pump family, designed specifically for ultra-low-power, inductorless 5V generation in space-constrained portable electronics where battery longevity and PCB area are critical.

FAQ

What is the maximum continuous output current supported by the LTC1517CS5-5#TRMPBF?

The LTC1517CS5-5#TRMPBF delivers up to 20mA continuous output current when input voltage is ≥3V, and 10mA when input voltage is ≥2.7V. This is specified under full temperature range with proper capacitor selection (CIN ≥3.3µF, COUT ≥6.8µF). Exceeding these limits causes output voltage droop beyond ±4% and may trigger thermal cycling.

Does the LTC1517CS5-5#TRMPBF require an external shutdown signal?

No, the LTC1517CS5-5#TRMPBF does not include a shutdown pin and operates continuously when VIN is within 2.7V–5V. For applications requiring controlled enable/disable, the LTC1522CMS8-5#TRPBF - a pin-compatible variant with active-low SHDN - is the recommended alternative. The LTC1517CS5-5#TRMPBF itself has no enable logic or standby mode.

What flying capacitor value is recommended for the LTC1517CS5-5#TRMPBF?

The LTC1517CS5-5#TRMPBF is optimized for a 0.1µF ceramic flying capacitor (C1), as confirmed in all typical application circuits and electrical characteristics tables. Using 0.22µF is acceptable but offers no performance benefit; smaller values (<0.1µF) reduce available output current and increase ripple. X7R or C0G dielectrics are preferred for stable capacitance across voltage and temperature.

Can the LTC1517CS5-5#TRMPBF operate with a 2.5V input supply?

No, the LTC1517CS5-5#TRMPBF has a minimum specified input voltage of 2.7V. Operation below 2.7V is outside absolute maximum ratings and results in failure to regulate - output voltage collapses and device enters undefined behavior. Systems with 2.5V sources must use a different regulator such as the LTC1516 (supports VIN down to 2.0V) or add a pre-boost stage.

Is the LTC1517CS5-5#TRMPBF RoHS-compliant and lead-free?

Yes, the LTC1517CS5-5#TRMPBF is RoHS-compliant and features lead-free (Pb-free) terminations per JEDEC J-STD-020. The "#TRMPBF" suffix explicitly denotes tape-and-reel packaging with lead-free finish. Its SOT-23 package meets IPC/JEDEC standard reflow profiles and is qualified for industrial temperature range (–40°C to 85°C).