Analog Devices Inc. LTC3833IUDC#TRPBF

Overview

LTC3833IUDC#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller for high-power applications, driving all-N-channel MOSFETs with controlled on-time valley current mode architecture. It delivers ±0.67% output regulation over temperature, supports 4.5V–38V input and 0.6V–5.5V output, and enables fast transient response in computing and distributed power systems.

For engineers reviewing the LTC3833IUDC#TRPBF datasheet, LTC3833IUDC#TRPBF pinout, LTC3833IUDC#TRPBF application, or LTC3833IUDC#TRPBF equivalent, key selection considerations include differential remote sensing capability (±500mV line loss compensation), 20ns minimum on-time, programmable 200kHz–2MHz switching frequency, and integrated overvoltage protection with power-good monitoring.

Technical Context

The LTC3833IUDC#TRPBF implements valley current mode control using a precision error amplifier (1.7 mS transconductance) and differential feedback path (VOSNS+ − VOSNS−) referenced to a 0.6V internal bandgap. Its controlled on-time architecture maintains constant-frequency operation independent of VIN, VOUT, and load, while enabling near 0% and near 100% duty cycles via tON(MIN) = 20 ns and tOFF(MIN) = 90 ns.

It supports dual current-sensing methods-RSENSE or DCR-with VRNG-selectable sense voltage range (30 mV to 61 mV), and integrates safety features including programmable current limit with foldback, output overvoltage protection, and a dedicated PGOOD open-drain output with ±7.5% hysteresis relative to regulated feedback voltage.

Key Specifications

Pinout & Package

20-lead (3 mm × 4 mm) plastic QFN package with exposed SGND pad (Pin 21), rated for –40°C to 125°C junction temperature and θJA = 43°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck controller applications.

Compared with MP2918GQ-Z and ISL8113IRZ-T7A, the LTC3833IUDC#TRPBF uniquely combines differential remote sensing, sub-100 ns dead-time control, and resistor-programmable frequency in a compact QFN - making it optimal for analog-intensive, high-accuracy analog power delivery where digital overhead is undesirable.

Availability

LTC3833IUDC#TRPBF is available at Aetrix Electronics and suitable for distributed power systems, point-of-load converters, and computing systems requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.

Supply support for LTC3833IUDC#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 high-performance analog power portfolio with rigorous process control and automotive-grade reliability testing.

The LTC3833IUDC#TRPBF belongs to Linear's high-efficiency synchronous buck controller product line, designed specifically for high-current, high-accuracy DC/DC conversion in computing, telecom, and industrial infrastructure where thermal robustness and regulation fidelity are critical.

FAQ

What is the operating temperature range for the LTC3833IUDC#TRPBF?

The LTC3833IUDC#TRPBF is specified for operation from –40°C to +125°C junction temperature. Its QFN package features an exposed SGND pad that must be soldered to the PCB for thermal conduction and electrical integrity. The device is fully tested and guaranteed across this range, unlike the E-grade variant which is only characterized to 85°C.

Does the LTC3833IUDC#TRPBF support both RSENSE and DCR current sensing?

Yes, the LTC3833IUDC#TRPBF supports both RSENSE and DCR current sensing. SENSE+ and SENSE− pins accept either a Kelvin-connected sense resistor or an RC filter across the inductor for DCR sensing. The VRNG pin selects the maximum sense voltage range (30 mV to 61 mV), allowing optimization for accuracy or power loss trade-offs.

How does differential output sensing work on the LTC3833IUDC#TRPBF?

The LTC3833IUDC#TRPBF uses VOSNS+ and VOSNS− pins to measure the true output voltage at the load, rejecting ground potential differences up to ±500 mV. VOSNS− sinks a 35 µA bias current, enabling accurate remote sensing even when local and remote grounds differ significantly - essential for high-current PCBs with separate power and signal ground planes.

Can the LTC3833IUDC#TRPBF be synchronized to an external clock?

Yes, the LTC3833IUDC#TRPBF can be synchronized to an external clock applied to the MODE/PLLIN pin. The internal PLL locks to external clocks within ±30% of the free-running frequency set by the RT resistor. This feature suppresses beat frequencies in multi-rail systems and reduces EMI in noise-sensitive datacomm applications.

What protection features does the LTC3833IUDC#TRPBF include?

The LTC3833IUDC#TRPBF includes output overvoltage protection (OVP) with automatic recovery, programmable current limit with foldback, undervoltage lockout (UVLO) on INTVCC, and a dedicated PGOOD output with ±7.5% hysteresis. During OVP events, the bottom gate (BG) is forced high to discharge the output and restore regulation - preventing damage to downstream loads.