Analog Devices Inc. LTC1983ES6-3#TRPBF

Overview

LTC1983ES6-3#TRPBF from Analog Devices (formerly Linear Technology) is a 100mA regulated inverting charge-pump DC/DC converter delivering –3V ±4% output from 2.3V–5.5V input. It features 25µA typical quiescent current, internal 900kHz oscillator, and zero-current shutdown via SHDN pin. Used for generating negative bias in single-supply portable systems such as LCD and GaAs FET circuits.

For engineers reviewing the LTC1983ES6-3#TRPBF datasheet, LTC1983ES6-3#TRPBF pinout, LTC1983ES6-3#TRPBF application, or LTC1983ES6-3#TRPBF equivalent, key selection criteria include regulated –3V output accuracy, 100mA load capability at low IQ, ThinSOT-23 package compatibility, thermal/short-circuit protection, and open-loop –VIN inversion mode operation.

Technical Context

The LTC1983ES6-3#TRPBF uses a two-phase nonoverlapping 900kHz switched-capacitor topology to invert and regulate VIN to –3V. Regulation is achieved via internal resistor divider feedback and hysteretic comparator (COMP1) controlling charge pump enable/disable cycles.

In shutdown mode, all circuitry disables and VIN supply current drops below 1µA; VOUT is disconnected from VIN and C–. The SHDN pin has 0.3V low and 1.1V high thresholds, with 2.2µA input current at 5.5V - enabling direct logic-level control without external pull-ups.

Key Specifications

Pinout & Package

Package: 6-lead TSOT-23 (ThinSOT), 1mm height, JEDEC MO-193 compliant. Pin pitch 0.95mm, body size 2.90mm × 1.60mm × 1.00mm max.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1983ES6-3#TRPBF, the LTC1983ES6-5#TRPBF offers identical form-factor and efficiency but targets –5V systems, while the LTC1754ES6-3#TRPBF trades output current and protection for dual-rail capability - making LTC1983ES6-3#TRPBF optimal for high-fidelity –3V bias where load current and robustness are primary concerns.

Availability

LTC1983ES6-3#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, LCD display bias, GaAs FET RF bias, and industrial sensor signal conditioning requiring stable component supply and long-lifecycle support.

Supply support for LTC1983ES6-3#TRPBF 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 product lines. Linear was founded in 1981 and specialized in high-performance linear ICs for demanding applications.

The LTC1983 series belongs to Linear's regulated charge-pump DC/DC converter family, designed specifically for ultra-low-power portable electronics requiring compact, efficient negative voltage generation without inductors.

FAQ

What is the maximum continuous output current of the LTC1983ES6-3#TRPBF?

The LTC1983ES6-3#TRPBF delivers up to 100mA of continuous regulated –3V output current under typical conditions (VIN ≥ 3.3V, TA = 25°C). At higher temperatures or lower input voltages, derating applies - e.g., 85mA at 85°C with VIN = 3.3V. Absolute maximum pulsed current is 125mA, but sustained operation above 100mA risks thermal shutdown activation.

Can the LTC1983ES6-3#TRPBF operate without external capacitors?

No, the LTC1983ES6-3#TRPBF requires three external capacitors: CIN (≥4.7µF), COUT (≥4.7µF), and CFLY (0.1µF–4.7µF). These are integral to charge-pump operation - CIN stabilizes VIN, COUT filters VOUT, and CFLY transfers energy. Omitting any causes failure to start, regulation loss, or excessive ripple. Ceramic X5R/X7R types are strongly recommended for all three positions.

Does the LTC1983ES6-3#TRPBF support open-loop –VIN inversion?

Yes, the LTC1983ES6-3#TRPBF automatically enters open-loop mode when the condition VIN – 3.06V > IOUT • ROUT is violated, producing VOUT ≈ –[VIN – (IOUT • ROUT)]. This occurs under high load or low VIN, providing usable inverted output without external circuit changes - though accuracy degrades to ±10% and output impedance rises to ~11Ω.

What is the shutdown current specification for the LTC1983ES6-3#TRPBF?

The LTC1983ES6-3#TRPBF draws less than 1µA from VIN when SHDN is held at 0V (typical value is 0.1µA). During shutdown, VOUT is fully disconnected from internal circuitry and CFLY, preventing backfeed or leakage into the negative rail - critical for preserving battery charge in standby modes.

Is the LTC1983ES6-3#TRPBF RoHS-compliant and lead-free?

Yes, the LTC1983ES6-3#TRPBF carries the #TRPBF suffix indicating tape-and-reel packaging with 100% matte tin (Sn) lead finish, fully compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1. The device is also halogen-free and meets Analog Devices' environmental specifications for industrial-grade reliability.