Analog Devices Inc. LTC1517ES5-3.3#TRMPBF

Overview

LTC1517ES5-3.3#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, regulated 3.3V switched-capacitor DC/DC charge pump converter in a 5-pin SOT-23 package. It delivers ±4% regulated output over 2V–4.4V input, draws only 6µA typical no-load current, supports up to 15mA output at VIN ≥ 2.5V, and operates at 700kHz without inductors - ideal for single-cell Li-ion battery-powered handheld instruments.

For engineers reviewing the LTC1517ES5-3.3#TRMPBF datasheet, LTC1517ES5-3.3#TRMPBF pinout, LTC1517ES5-3.3#TRMPBF application, or LTC1517ES5-3.3#TRMPBF equivalent, key selection criteria include ultralow quiescent current, thermal/short-circuit protection, SOT-23 footprint constraints, and load-dependent output current capability across extended temperature range (–40°C to +85°C).

Technical Context

The LTC1517ES5-3.3#TRMPBF implements Burst Mode™ operation using a 2-phase nonoverlapping 700kHz oscillator to control internal charge pump switches. Regulation is achieved via an internal 1.25V reference and resistor-divider feedback sensing, enabling hysteresis-based on/off control of the flying capacitor charging cycle.

It integrates thermal shutdown (trip ~160°C, recovery ~145°C) and survives indefinite VOUT-to-GND short circuits while drawing 20–150mA from VIN. The architecture requires only three external capacitors: 0.1µF flying capacitor (C1), plus ≥3.3µF low-ESR CIN and COUT - eliminating inductors and minimizing PCB area to 0.045in².

Key Specifications

Pinout & Package

Package: 5-lead plastic SOT-23 (S5), 2.80–3.00mm × 1.90mm × 1.10–1.30mm, JEDEC SC-74A compliant, with 256°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1517CS5-3.3, the LTC1517ES5-3.3#TRMPBF adds guaranteed –40°C to +85°C operation and tighter production testing at temperature extremes - essential for field-deployed equipment. Versus LTC1516ES5-5, it provides exact 3.3V output compliance without additional regulation stages, preserving efficiency and board space.

Availability

LTC1517ES5-3.3#TRMPBF is available at Aetrix Electronics and suitable for handheld medical sensors, PCMCIA power management, and industrial handheld testers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LTC1517ES5-3.3#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 precision analog and power management portfolio. Linear pioneered high-performance switched-capacitor regulators for ultra-low-power applications.

The LTC1517ES5-3.3#TRMPBF belongs to Linear's micropower charge pump family, designed specifically for battery-powered portable instrumentation where minimal quiescent current, small footprint, and robust fault handling are mandatory.

FAQ

What is the maximum continuous output current of the LTC1517ES5-3.3#TRMPBF?

The LTC1517ES5-3.3#TRMPBF delivers up to 15mA continuously when input voltage is ≥2.5V, and 8mA when input is ≥2V but <2.5V. This load capability is specified across the full –40°C to +85°C operating range and assumes proper capacitor selection (≥3.3µF CIN/COUT, 0.1µF C1). Exceeding these limits causes output voltage droop outside ±4% regulation.

Does the LTC1517ES5-3.3#TRMPBF require an external shutdown control signal?

No, the LTC1517ES5-3.3#TRMPBF does not include an enable/shutdown pin and operates continuously when VIN is within 2V–4.4V. Its Burst Mode™ architecture inherently minimizes current draw during light loads - consuming only 6µA typical with no output load. For true on/off control, an external MOSFET switch on VIN is required.

Can the LTC1517ES5-3.3#TRMPBF be used with input voltages above 4.4V?

No. The absolute maximum input voltage for the LTC1517ES5-3.3#TRMPBF is 6V, but the recommended operating range is strictly 2V to 4.4V. Operation above 4.4V violates the Electrical Characteristics specification and risks output regulation failure, increased ripple, or accelerated parametric drift. For higher input rails, consider a buck regulator or series LDO pre-regulator.

What is the purpose of the C1+ and C1– pins on the LTC1517ES5-3.3#TRMPBF?

The C1+ and C1– pins on the LTC1517ES5-3.3#TRMPBF connect to the terminals of the external 0.1µF flying capacitor (C1), which stores and transfers charge during the 2-phase pumping cycle. C1+ is the high-side switching node; C1– is the low-side return. These pins must be routed with minimal trace length and loop area to reduce EMI and switching losses - ceramic capacitors are mandatory for C1.

How does thermal protection work in the LTC1517ES5-3.3#TRMPBF during output short-circuit conditions?

During a VOUT-to-GND short, the LTC1517ES5-3.3#TRMPBF draws 20–150mA from VIN, raising junction temperature. When die temperature reaches ~160°C, internal thermal shutdown disables the charge pump. Once temperature falls to ~145°C, operation resumes. This cycling continues indefinitely without damage - verified across –40°C to +85°C ambient - making the LTC1517ES5-3.3#TRMPBF suitable for unattended or inaccessible installations.