Analog Devices Inc. LTC1983ES6-5#TRMPBF

Overview

LTC1983ES6-5#TRMPBF from Analog Devices (formerly Linear Technology) is a regulated inverting charge-pump DC/DC converter delivering –5V at up to 100mA output current from a 2.3V–5.5V input supply. It features ±4% output voltage accuracy, 900kHz internal oscillator, and operates in regulated or open-loop mode. It serves as a compact negative bias supply in portable systems with strict quiescent current constraints.

For engineers reviewing the LTC1983ES6-5#TRMPBF datasheet, LTC1983ES6-5#TRMPBF pinout, LTC1983ES6-5#TRMPBF application, or LTC1983ES6-5#TRMPBF equivalent, key selection criteria include regulated –5V output capability, 25µA typical operating current, shutdown control via SHDN pin, and compatibility with low-profile TSOT-23 packaging for space-constrained designs.

Technical Context

The LTC1983ES6-5#TRMPBF uses a two-phase nonoverlapping clock to drive internal charge pump switches (S1A/S1B/S2A/S2B), enabling voltage inversion through a flying capacitor (CFLY). Regulation is achieved via internal resistor-divider feedback and a hysteretic comparator (COMP1) that enables/disables pumping based on VOUT droop relative to –5V ±4% thresholds.

It supports dual operating modes: regulated output mode (when VIN ≥ 5V and load conditions satisfy VIN – 5.06V > IOUT • ROUT) and open-loop inverter mode (VOUT ≈ –[VIN – (IOUT • ROUT)]), with automatic thermal shutdown (>155°C) and short-circuit protection ensuring robust operation under fault conditions.

Key Specifications

Pinout & Package

The LTC1983ES6-5#TRMPBF is housed in a 6-pin low-profile (1mm height) TSOT-23 package (S6), optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1928-5 and LTC1754ES6-5#TRMPBF, the LTC1983ES6-5#TRMPBF delivers the highest output current (100mA) in the smallest footprint without added LDO complexity, making it optimal for cost-sensitive, space-constrained portable systems requiring robust –5V bias.

Availability

LTC1983ES6-5#TRMPBF is available at Aetrix Electronics and suitable for portable medical sensors, LCD display bias, GaAs FET RF bias, and single-supply signal conditioning requiring stable component supply across production lifecycles.

Supply support for LTC1983ES6-5#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 continues its legacy of high-performance analog ICs. The company specializes in precision signal conditioning, power management, and interface solutions for demanding industrial and automotive applications.

The LTC1983 series belongs to Linear's regulated charge-pump DC/DC converter product line, designed specifically for generating accurate negative rails in battery-powered portable equipment where size, efficiency, and reliability are critical.

FAQ

What is the regulated output voltage of the LTC1983ES6-5#TRMPBF?

The LTC1983ES6-5#TRMPBF provides a regulated –5V output with ±4% accuracy over temperature and load. This specification applies when operating in regulated mode-i.e., when VIN ≥ 5V and the load satisfies VIN – 5.06V > IOUT • ROUT. Under these conditions, the LTC1983ES6-5#TRMPBF maintains tight regulation without external feedback components.

Can the LTC1983ES6-5#TRMPBF operate from a 3.3V input supply?

Yes, the LTC1983ES6-5#TRMPBF can operate from a 3.3V input, but it will function in open-loop inverter mode rather than regulated –5V mode. In this case, VOUT ≈ –[VIN – (IOUT • ROUT)], yielding approximately –3.3V under light loads. For true –5V regulation, VIN must be ≥5V per the datasheet condition VIN – 5.06V > IOUT • ROUT. The LTC1983ES6-5#TRMPBF remains functional and protected at 3.3V input.

How does the SHDN pin function on the LTC1983ES6-5#TRMPBF?

The SHDN pin on the LTC1983ES6-5#TRMPBF is a logic-level control input: driving it low (<0.3V) places the device in zero-current shutdown, drawing <1µA from VIN and disconnecting VOUT from internal circuitry. Driving it high (≥1.1V, typically tied to VIN) enables normal operation. The pin has ~0.7V threshold and draws <4µA; it must not float and should be actively driven to avoid erratic behavior. This feature enables precise power sequencing in the LTC1983ES6-5#TRMPBF.

What external capacitors are required for stable operation of the LTC1983ES6-5#TRMPBF?

The LTC1983ES6-5#TRMPBF requires three external capacitors: a 1µF ceramic flying capacitor (CFLY) between C+ and C– pins; and ≥4.7µF low-ESR ceramic or tantalum capacitors for CIN (between VIN and GND) and COUT (between VOUT and GND). Recommended values are 10µF for CIN and COUT to achieve 60mVP-P ripple at 100mA. Aluminum electrolytics are discouraged due to high ESR. All capacitors must be placed close to their respective pins per the LTC1983ES6-5#TRMPBF layout guidelines.

Is the LTC1983ES6-5#TRMPBF protected against overtemperature and short-circuit faults?

Yes, the LTC1983ES6-5#TRMPBF integrates both overtemperature and short-circuit protection. When junction temperature exceeds ~155°C, internal thermal shutdown disables the charge pump; recovery occurs once temperature falls to ~145°C. During output short-circuit events, the device cycles in and out of thermal shutdown indefinitely without latch-up or damage. These protections are inherent to the LTC1983ES6-5#TRMPBF design and require no external components.