Analog Devices Inc. LT1534IS-1#TRPBF

Overview

LT1534IS-1#TRPBF from Analog Devices (formerly Linear Technology) is a 2A ultralow-noise current-mode switching regulator optimized for low-EMI boost topologies. It features independently programmable voltage and current slew rates (11 V/µs rising, 14.5 V/µs falling), 2.7V–23V input range, ±2.5V dual-polarity feedback capability, and internal 2A power switch - enabling precision 5V/±5V supplies in medical instrumentation and isolated industrial sensors.

For engineers reviewing the LT1534IS-1#TRPBF datasheet, LT1534IS-1#TRPBF pinout, LT1534IS-1#TRPBF application, or LT1534IS-1#TRPBF equivalent, this page delivers verified specifications, SO-16 pin mapping with PGND/VC/SHDN roles, real-world EMI reduction trade-offs, thermal derating guidance for fused-lead packages, and two validated alternative regulators for noise-sensitive DC-DC design.

Technical Context

The LT1534IS-1#TRPBF implements current-mode control with internal slope compensation to ensure stability at high duty cycles up to 91%. Its dual feedback architecture supports simultaneous regulation of positive (FB pin, 1.25V reference) and negative (NFB pin, –2.5V reference) outputs via separate error amplifiers with 1.25V/V gain and 1500 µmho transconductance.

Slew control uses two independent loops: RVSL sets collector voltage dV/dt (220/RVSL kΩ V/µs), while RCSL sets emitter current dI/dt (33/RCSL kΩ A/µs). Both pins interface with external resistors (3.9k–68kΩ) to tune harmonic content without altering oscillator frequency (20–250 kHz), enabling precise EMI band placement when synchronized to an external clock via SYNC pin.

Key Specifications

Pinout & Package

LT1534IS-1#TRPBF is housed in a 16-lead narrow SOIC package (S package) with four corner pins (1, 8, 9, 16) fused to the die attach paddle for enhanced thermal dissipation. Pins must be connected to expanded PCB lands per manufacturer thermal guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultralow-noise boost regulator applications.

Compared with LTC3867EFE#TRPBF and TPS61088RHLR, the LT1534IS-1#TRPBF uniquely delivers programmable slew control, dual-polarity feedback, and fused-lead thermal performance in a single SO-16 package - making it irreplaceable for EMI-constrained, bipolar-rail medical and test equipment designs.

Availability

LT1534IS-1#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, isolated industrial sensors, and precision data acquisition systems requiring stable component supply with guaranteed long-term availability.

Supply support for LT1534IS-1#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 full technical support and manufacturing continuity for legacy Linear products including the LT1534 family.

The LT1534IS-1#TRPBF belongs to Linear's ultralow-noise switching regulator product line, designed specifically for EMI-sensitive applications such as medical diagnostics, precision test equipment, and isolated industrial interfaces where conducted/radiated noise must be minimized without sacrificing efficiency.

FAQ

What is the maximum allowable input voltage for LT1534IS-1#TRPBF?

The absolute maximum input voltage (VIN) for LT1534IS-1#TRPBF is 30V, but the recommended operating range is strictly 2.7V to 23V. Exceeding 23V risks violating the internal LDO's safe operating area and may trigger premature thermal shutdown. The device enters undervoltage lockout below 2.55V, halting switching and pulling the VC pin low - a behavior confirmed in Electrical Characteristics tables across temperature ranges.

How does LT1534IS-1#TRPBF achieve ultralow EMI compared to standard boost converters?

LT1534IS-1#TRPBF achieves ultralow EMI through independent voltage and current slew rate control via RVSL and RCSL pins, reducing high-frequency harmonic power by up to 40dB. Unlike standard boost converters with fixed-edge transitions, this IC lets designers tune dV/dt and dI/dt separately using external resistors - directly suppressing EMI sources at the switch node rather than filtering after generation.

Can LT1534IS-1#TRPBF regulate both positive and negative output voltages simultaneously?

Yes, LT1534IS-1#TRPBF can regulate both polarities simultaneously: the FB pin (1.25V reference) controls positive outputs like +5V, while the NFB pin (–2.5V reference) controls negative outputs like –5V. When both pins are used, the IC prevents either rail from overvoltage - though load regulation is compromised as the highest-output rail dominates control, per Applications Information Section 10.

What thermal considerations apply to LT1534IS-1#TRPBF in SO-16 fused-lead packaging?

LT1534IS-1#TRPBF in the SO-16 fused-lead package has θJA = 50°C/W - significantly lower than standard SO-16 (100°C/W) due to thermal vias through pins 1/8/9/16. To maintain reliability, these four pins must connect to expanded copper pours; junction temperature is calculated as TJ = TAMB + PD × 50°C/W, where PD includes slew-related losses that rise with slower dV/dt and dI/dt settings.

Is LT1534IS-1#TRPBF pin-compatible with LT1534CS-1#TRPBF?

No, LT1534IS-1#TRPBF is not pin-compatible with LT1534CS-1#TRPBF. While both share the same 16-pin SOIC footprint, their pinouts differ fundamentally: LT1534IS-1#TRPBF assigns GND to pins 1/8/9/16 and NFB to pin 10, whereas LT1534CS-1#TRPBF uses pins 1/8/9/16 as NC/GND/GND/GND and places NFB at pin 8 - confirmed in Package/Order Information diagrams on pages 2–3 of the datasheet.