Analog Devices Inc. LT8410IDC#TRPBF

Overview

LT8410IDC#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-power boost converter IC with integrated NPN power switch, Schottky diode, and PMOS output disconnect circuitry. It operates from 2.5V to 16V input, delivers up to 40V output, features 8.5μA quiescent current in active mode, 0μA in shutdown, and uses variable peak-current/variable off-time control for high efficiency across wide load ranges. It is used in sensor power supplies requiring stable bias under ultra-low-power constraints.

For engineers reviewing the LT8410IDC#TRPBF datasheet, LT8410IDC#TRPBF pinout, LT8410IDC#TRPBF application, or LT8410IDC#TRPBF equivalent, key selection criteria include its 25mA switch current limit, integrated 12.4MΩ/0.4MΩ feedback divider, 1.235V reference voltage tolerance, 8-pin 2mm × 2mm DFN package, and output disconnect functionality enabling true input-output isolation during shutdown.

Technical Context

The LT8410IDC#TRPBF implements a variable peak inductor current and variable switch off-time control scheme-distinct from fixed-frequency PWM or constant-on-time architectures-to maintain low output ripple and high efficiency from microamp to milliamp loads. Its internal 1.235V reference feeds a precision error amplifier whose positive input (FBP) sets output voltage via external resistor ratio or direct bias.

It integrates a comparator on the SHDN pin with 1.30V threshold and 60mV hysteresis, overvoltage protection on CAP and VOUT pins, built-in soft-start (via optional VREF capacitor), and a dedicated PMOS disconnect switch that blocks VOUT from VIN during shutdown while limiting disconnect current to 19mA (typ).

Key Specifications

Pinout & Package

LT8410IDC#TRPBF is housed in an 8-lead plastic DFN package (2mm × 2mm) with exposed thermal pad (Pin 9, GND). The package is RoHS-compliant, lead-free, and requires soldering of the exposed pad to PCB ground for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Compared with LT8410EDC#TRPBF, LT8410IDC#TRPBF guarantees full –40°C to 125°C operation and offers tighter parametric consistency across temperature extremes; versus LT3464EDD#TRPBF, it provides integrated disconnect, lower IQ, higher VIN, and superior ripple performance-making it the preferred choice for ultra-low-power isolated bias generation.

Availability

LT8410IDC#TRPBF is available at Aetrix Electronics and suitable for sensor power, RF MEMS relay bias, and general-purpose precision bias applications requiring stable component supply, long-term manufacturability, and guaranteed industrial-temperature performance.

Supply support for LT8410IDC#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 product support, documentation, and manufacturing continuity for the LT8410 family.

The LT8410 series was designed specifically for ultralow-power, high-voltage bias generation in space-constrained, battery-operated systems-emphasizing quiescent current optimization, integrated protection, and minimal external component count.

FAQ

What is the maximum output voltage supported by the LT8410IDC#TRPBF?

The LT8410IDC#TRPBF supports a maximum output voltage of 40V, enforced by internal overvoltage protection on the CAP and VOUT pins. Even if the FBP pin voltage is driven above the reference level, the output will clamp at 40V. This hard limit ensures safe operation with high-voltage loads such as RF MEMS relays and photomultiplier tubes, and is specified across the full –40°C to 125°C operating junction temperature range for LT8410IDC#TRPBF.

Does the LT8410IDC#TRPBF include output disconnect functionality, and how does it operate?

Yes, the LT8410IDC#TRPBF integrates a PMOS output disconnect switch between VOUT and the load. When enabled via SHDN, the PMOS conducts; during shutdown (SHDN < 0.3V), it turns off completely, isolating the load from the input supply and allowing VOUT to discharge to ground. The PMOS current is internally limited to 19mA (typ), protecting against short-circuit faults. This feature is critical for applications like sensor bias where zero standby leakage is required - a capability not present in many competing boost converters.

What is the quiescent current of the LT8410IDC#TRPBF in active and shutdown modes?

The LT8410IDC#TRPBF draws 8.5μA (typical) quiescent current in active mode and 0μA (typical) in shutdown mode - verified over the full –40°C to 125°C temperature range. This ultralow IQ enables multi-year operation on small batteries in wireless sensor networks. The 0μA shutdown current is achieved by fully disabling internal bias circuits and disconnecting the feedback divider from VOUT, eliminating input-referred leakage paths. These values are explicitly guaranteed for the I-grade (LT8410IDC#TRPBF), unlike the E-grade variant.

How is the output voltage set on the LT8410IDC#TRPBF, and what role does the FBP pin play?

The output voltage of the LT8410IDC#TRPBF is set by the voltage applied to the FBP (Feedback Positive) pin, following the relationship VOUT = 31.85 × VFBP. The FBP pin serves as the positive input to the internal error amplifier. Typically, a resistor divider from the 1.235V VREF pin sets VFBP - for example, a 604kΩ/412kΩ divider yields ~0.5V at FBP and 16V at VOUT. The FBP pin can also accept an external reference for dynamic voltage control. The internal 12.4MΩ/0.4MΩ divider from VOUT ensures accurate sensing without loading the external network.

What package type and thermal considerations apply to the LT8410IDC#TRPBF?

The LT8410IDC#TRPBF is supplied in an 8-lead 2mm × 2mm plastic DFN package (DC8) with an exposed thermal pad (Pin 9). This pad must be soldered to a PCB ground plane to ensure proper thermal dissipation (θJA = 88°C/W) and EMI shielding. The package supports reflow soldering per JEDEC J-STD-020, and the exposed pad significantly improves power handling and reliability under continuous 25mA switching loads. Layout guidelines require short, low-inductance traces to SW, CAP, and VOUT pins, and local bypassing of VCC and VOUT to GND.