Analog Devices Inc. LT1767EMS8E-1.8#TRPBF

Overview

LT1767EMS8E-1.8#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 1.25MHz step-down switching regulator with integrated 1.5A NPN power switch, fixed 1.8V output, and MS8E exposed-pad package. It operates from 3V to 25V input, delivers up to 1.5A load current, achieves 95% peak efficiency at 12V→3.3V, and features current-mode control for fast transient response in portable computing and battery-powered systems.

For engineers reviewing the LT1767EMS8E-1.8#TRPBF datasheet, LT1767EMS8E-1.8#TRPBF pinout, LT1767EMS8E-1.8#TRPBF application, or LT1767EMS8E-1.8#TRPBF equivalent, key selection criteria include its fixed 1.8V output voltage, 1.25MHz constant-frequency operation, 0.22Ω switch on-resistance, 2% output tolerance, and thermal performance enabled by the exposed GND pad in the MS8E package.

Technical Context

The LT1767EMS8E-1.8#TRPBF implements a constant-frequency, current-mode buck architecture with an internal 1.25MHz oscillator and cycle-by-cycle peak current limiting. Its bipolar NPN switch is driven via a BOOST pin that supplies >VIN voltage to ensure saturation and low conduction loss (330mV typical at –1.5A).

Feedback is internally configured for 1.8V output using a precision 1.2V reference and trimmed resistor divider; the FB pin is directly connected to VOUT. Shutdown is controlled by a 1.33V threshold comparator with 7µA hysteresis, reducing quiescent current to 6µA.

Key Specifications

Pinout & Package

The LT1767EMS8E-1.8#TRPBF is housed in an 8-lead plastic MSOP package with exposed GND pad (MS8E), optimized for low thermal resistance (θ_JA = 40°C/W) and high-power density. The exposed pad must be soldered to a large PCB copper area for thermal and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LTC3605EMS8E-1.8#TRPBF and TPS54318RTER, the LT1767EMS8E-1.8#TRPBF provides optimal balance of integration (internal feedback), thermal robustness (40°C/W), and proven 1.25MHz efficiency - making it preferred for industrial and portable applications where reliability and design simplicity outweigh marginal frequency or current gains.

Availability

LT1767EMS8E-1.8#TRPBF is available at Aetrix Electronics and suitable for DSL modems, portable computers, and battery-powered systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LT1767EMS8E-1.8#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 legacy of high-performance analog and power management ICs with rigorous qualification and long-term product support.

The LT1767 family was designed specifically for compact, high-efficiency DC/DC conversion in space- and thermal-constrained applications such as portable instrumentation and telecom infrastructure, emphasizing integrated power switches and robust current-mode control.

FAQ

What is the maximum continuous output current of the LT1767EMS8E-1.8#TRPBF?

The LT1767EMS8E-1.8#TRPBF guarantees a minimum 1.5A switch current limit over –40°C to 125°C. Continuous output current depends on thermal conditions: with proper PCB copper area (≥1in² connected to exposed pad), it delivers 1.2A continuously at 12V input and 1.8V output. At higher ambient temperatures or reduced copper, derating applies per the thermal curves in the datasheet.

Does the LT1767EMS8E-1.8#TRPBF require external feedback resistors?

No. The LT1767EMS8E-1.8#TRPBF integrates the precision resistor divider for 1.8V output; the FB pin is internally connected to VOUT. This eliminates external components, reduces layout sensitivity, and ensures 2% total output tolerance across line, load, and temperature - unlike adjustable versions that require external R1/R2 networks.

How does the BOOST pin function in the LT1767EMS8E-1.8#TRPBF?

The BOOST pin in the LT1767EMS8E-1.8#TRPBF supplies a voltage higher than VIN to the internal NPN switch driver, enabling full saturation and minimizing conduction loss (330mV typical). It requires an external 0.1µF ceramic capacitor and Schottky diode (e.g., CMDSH-3); connecting the diode anode to VOUT generates ~VOUT+VIN, while connection to VIN yields ~2×VIN - both must respect the BOOST pin's 35V absolute max rating.

Can the LT1767EMS8E-1.8#TRPBF be synchronized to an external clock?

Yes. The SYNC pin accepts logic-level signals from 1.5MHz to 2MHz with 20–80% duty cycle, allowing the LT1767EMS8E-1.8#TRPBF's internal oscillator to lock to an external source. This feature reduces EMI by eliminating switching frequency sidebands and enables timing coordination in multi-rail power systems - when unused, SYNC must be grounded.

What thermal considerations apply to the LT1767EMS8E-1.8#TRPBF MS8E package?

The LT1767EMS8E-1.8#TRPBF uses an exposed-pad MS8E package with θ_JA = 40°C/W. To achieve rated 1.5A performance, the exposed GND pad must be soldered to ≥1in² of inner-layer or bottom-side copper with ≥4 thermal vias (0.3mm diameter) to internal ground planes. Insufficient copper area increases junction temperature and triggers thermal shutdown at ~150°C.