Analog Devices Inc. LT8415EDDB#TRPBF

Overview

LT8415EDDB#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-power boost converter IC with dual integrated complementary MOSFET half-bridges (N- and P-channel), on-chip Schottky diode, output disconnect PMOS, and 12.4MΩ/0.4MΩ internal feedback divider. It delivers up to 40V output from 2.5V–16V input, achieves 10.5μA quiescent current in active mode, and supports 34V/0V bidirectional drive of external capacitors for liquid lens or RF MEMS relay biasing.

For engineers reviewing the LT8415EDDB#TRPBF datasheet, LT8415EDDB#TRPBF pinout, LT8415EDDB#TRPBF application, or LT8415EDDB#TRPBF equivalent, key selection criteria include its dual half-bridge timing control, 0μA shutdown current, integrated VREF (1.235V ±15mV), 12-pin 3mm × 2mm DFN package with exposed thermal pad, and built-in overvoltage protection on CAP/VOUT/OUT1/OUT2 pins.

Technical Context

The LT8415EDDB#TRPBF employs a variable peak inductor current and variable off-time control scheme to maintain regulation across wide load ranges while minimizing output voltage ripple and maximizing efficiency. Its internal error amplifier compares FBP voltage (set by external resistor divider from VREF or direct bias) against a precise 1.235V reference to servo VOUT to 31.85 × VFBP.

Each half-bridge (IN1/OUT1 and IN2/OUT2) is synchronously controlled by a single logic input; shoot-through is prevented by inherent dead-time insertion. The integrated PMOS output disconnect switch enables full isolation of VOUT from CAP during shutdown, with 19mA current limiting and 50mV VCAP–VOUT drop at 1mA load.

Key Specifications

Pinout & Package

LT8415EDDB#TRPBF is housed in a 12-pin 3mm × 2mm plastic DFN package (DDB) with exposed thermal pad (Pin 13, GND). The package is RoHS-compliant, lead-free, and optimized for low EMI and thermal performance in space-constrained portable systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter with integrated half-bridge applications.

Compared with LT3463AEDD#TRPBF and LT3467EDE#TRPBF, LT8415EDDB#TRPBF uniquely integrates dual half-bridges with shoot-through protection, 0μA shutdown, and output disconnect-making it the only option for energy-constrained, fast-switching capacitive load driving without external MOSFETs or level shifters.

Availability

LT8415EDDB#TRPBF is available at Aetrix Electronics and suitable for liquid lens driver, RF MEMS relay power, and low-power actuator bias applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/REACH compliance.

Supply support for LT8415EDDB#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision instrumentation, industrial automation, and communications infrastructure.

The LT8415EDDB#TRPBF belongs to Linear's ultralow-power DC/DC converter family, designed specifically for energy-harvesting and battery-critical systems that demand high-voltage generation with nanowatt-level idle consumption and integrated drive capability for capacitive MEMS actuators.

FAQ

What is the maximum output voltage supported by the LT8415EDDB#TRPBF?

The LT8415EDDB#TRPBF supports a maximum regulated output voltage of 40V, enforced by internal overvoltage protection circuitry on the VOUT, CAP, OUT1, and OUT2 pins. Even if the FBP pin voltage is driven above the nominal 1.235V reference, the output will clamp at 40V to protect connected loads. This hard limit is independent of external resistor divider selection.

How does the LT8415EDDB#TRPBF achieve 0μA quiescent current in shutdown mode?

The LT8415EDDB#TRPBF achieves true 0μA quiescent current in shutdown by fully disabling all internal bias currents-including the reference, error amplifier, and gate drivers-when SHDN is pulled below 0.3V. The internal disconnect PMOS also turns off, blocking any path from VOUT to CAP or GND. Measured shutdown current is ≤1μA across temperature, with typical value at 0μA.

Can the LT8415EDDB#TRPBF drive asymmetric capacitive loads on OUT1 and OUT2 simultaneously?

Yes, the LT8415EDDB#TRPBF supports independent control of OUT1 and OUT2 via separate IN1 and IN2 logic inputs, enabling asymmetric drive waveforms. Each half-bridge has identical electrical characteristics (70mV PMOS drop, 85mV NMOS drop, 2.5μs rise time), allowing precise timing skew or duty-cycle mismatch between channels without cross-talk or shoot-through risk.

What is the purpose of the internal 12.4MΩ/0.4MΩ resistor divider in the LT8415EDDB#TRPBF?

The internal 12.4MΩ/0.4MΩ resistor divider connects directly between VOUT and GND, feeding the FBP pin. It reduces input-referred quiescent current by eliminating the need for external high-value resistors, which would otherwise draw leakage current through PCB contamination or humidity. This design cuts total system IQ by up to 4μA compared to discrete divider implementations.

Does the LT8415EDDB#TRPBF require an external capacitor on the VREF pin for stable operation?

No, the LT8415EDDB#TRPBF operates stably without an external capacitor on VREF; the pin provides a robust 1.235V reference with <0.01%/V line regulation. However, adding a 47nF–220nF capacitor enables soft-start by controlling the VREF ramp rate-reducing inrush current and peak inductor stress during power-up. This capacitor is optional but recommended for high-reliability applications.