Analog Devices Inc. LTC1174HVCS8-5#TRPBF

Overview

LTC1174HVCS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-efficiency, current-mode step-down DC/DC converter with integrated 0.9 Ω P-channel MOSFET switch, optimized for 5 V output from 4 V to 18.5 V input. It delivers up to 400 mA load current, achieves 94% peak efficiency, features pin-selectable 340 mA/600 mA current limit, and supports low-battery detection for portable instrumentation and battery-powered equipment.

For engineers reviewing the LTC1174HVCS8-5#TRPBF datasheet, LTC1174HVCS8-5#TRPBF pinout, LTC1174HVCS8-5#TRPBF application, or LTC1174HVCS8-5#TRPBF equivalent, key selection criteria include its wide 4–18.5 V input range, 5 V ±2.5% regulated output, 130 µA standby current, active-low micropower shutdown, and compatibility with standard surface-mount inductors and Schottky catch diodes.

Technical Context

The LTC1174HVCS8-5#TRPBF employs a constant off-time (COT) architecture with internal timing capacitor control, enabling frequency variation from ~42 kHz to ~111 kHz depending on VIN–VOUT differential. Its current-mode loop operates in continuous conduction mode at medium-to-heavy loads and automatically transitions to Burst Mode® under light loads to maintain high efficiency down to 10 mA.

Regulation is achieved via an internal 1.25 V reference and fixed resistive divider (for -5 versions), while low-battery detection uses a dedicated comparator with 1.25 V threshold and 7.5–30 mV hysteresis. The IPGM pin selects between two peak current limits (340 mA or 600 mA), and the SW pin drives external inductor/diode networks in buck topology.

Key Specifications

Pinout & Package

Package: 8-lead plastic SOIC (S8), RoHS-compliant, surface-mount, 150°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down DC/DC converter applications.

Compared with LTC1174CS8-5#TRPBF, the LTC1174HVCS8-5#TRPBF provides 5 V regulation with 5 V higher input headroom and identical feature set; versus TPS62231DRYR, it trades higher frequency for integrated diagnostics and topology flexibility, reducing total system component count.

Availability

LTC1174HVCS8-5#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable instruments, memory backup supplies, distributed power systems, and positive-to-negative converters requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LTC1174HVCS8-5#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC1174HV series belongs to ADI's legacy high-efficiency DC/DC converter product line, designed specifically for cost-sensitive, low-noise, and battery-conscious applications where simplicity, reliability, and wide input range are critical.

FAQ

What is the maximum input voltage rating for the LTC1174HVCS8-5#TRPBF?

The LTC1174HVCS8-5#TRPBF has an absolute maximum input voltage rating of 18.5 V on the VIN pin. This distinguishes it from the standard LTC1174CS8-5#TRPBF (13.5 V max), making the HV version suitable for 15 V industrial rails or 16 V automotive battery systems with transient margin. Operation above 18.5 V risks permanent damage per Absolute Maximum Ratings.

Does the LTC1174HVCS8-5#TRPBF require external feedback resistors to regulate 5 V output?

No, the LTC1174HVCS8-5#TRPBF does not require external feedback resistors. It integrates a precision resistive divider that sets the output to 5.00 V ±2.5%, referenced to an internal 1.25 V bandgap. Pin 1 (VOUT) is the regulated output node - unlike the adjustable LTC1174HV, no external R1/R2 network is needed for this fixed-output variant.

How does the low-battery detection function work on the LTC1174HVCS8-5#TRPBF?

The LTC1174HVCS8-5#TRPBF implements low-battery detection using Pin 3 (LBIN) as the inverting input of a comparator referenced to an internal 1.25 V threshold. An external resistive divider from VIN to GND sets the trip point (e.g., 5.5 V). When LBIN falls below 1.25 V, Pin 2 (LBOUT) sinks up to 1.5 mA, enabling direct LED drive or microcontroller interrupt signaling - all without additional ICs.

Can the LTC1174HVCS8-5#TRPBF be used in inverting (positive-to-negative) configurations?

Yes, the LTC1174HVCS8-5#TRPBF can be configured as a positive-to-negative converter by grounding the VOUT pin and taking the output from GND, per Figure 5 in the datasheet. This leverages its fixed 5 V regulation to generate –5 V. Input voltage headroom must respect the 18.5 V absolute max rating relative to the new output rail - e.g., 12 V input yields –5 V output with 1.5 V margin.

What is the purpose of the IPGM pin on the LTC1174HVCS8-5#TRPBF?

The IPGM pin (Pin 7) on the LTC1174HVCS8-5#TRPBF selects between two peak inductor current limits: 340 mA when pulled to GND, or 600 mA when tied to VIN. This allows designers to optimize inductor size, ripple current, and transient response for specific load profiles - all without changing the PCB layout or external components.