Analog Devices Inc. LTC3290HMSE#PBF

Overview

LTC3290HMSE#PBF from Analog Devices is a high-voltage boost charge pump IC supporting 4.5V to 55V input and auxiliary supply ranges, delivering up to 50mA output current with 15µA VIN quiescent current and 1µA VAUX quiescent current. It operates in two modes: standard boost (VOUT ≤ VIN + VAUX) or VIN-tracking mode (VOUT = VIN + fixed offset), enabling high-side N-FET driver supplies and industrial power switching rails.

For engineers reviewing the LTC3290HMSE#PBF datasheet, LTC3290HMSE#PBF pinout, LTC3290HMSE#PBF application, or LTC3290HMSE#PBF equivalent, key selection criteria include its AEC-Q100 qualification for automotive use, reverse input protection to –55V, thermally enhanced 10-pin MSOP package with exposed GND pad, and dual-mode regulation architecture requiring only two external resistors for precise output setting.

Technical Context

The LTC3290HMSE#PBF implements a 250kHz fixed-frequency switched-capacitor boost topology using four internal MOSFET switches (S1–S4) and an external flying capacitor to transfer charge from VAUX and VIN to VOUT. Its control loop uses a 1V reference at the FB pin and supports hysteretic Burst Mode® operation for ultra-low quiescent current at light loads.

In VIN-tracking mode, the device mirrors a reference current from FB through R1 to generate a proportional offset voltage across R2 between VOUT and VSET, enabling precise tracking independent of VIN variation. The PGOOD pin provides open-drain status signaling with programmable thresholds for both boost and tracking configurations.

Key Specifications

Pinout & Package

The LTC3290HMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP package with exposed GND pad (Pin 11), requiring soldering to PCB ground plane for thermal performance (θJA = 45°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage charge pump applications.

Compared with LTC3261IMSE#PBF and LTC3256EMSE#PBF, the LTC3290HMSE#PBF uniquely combines positive boost, VIN-tracking, reverse input protection, and AEC-Q100 qualification - making it the only option among the three for automotive high-side gate drivers or adaptive bias supplies requiring input-voltage-following behavior.

Availability

LTC3290HMSE#PBF is available at Aetrix Electronics and suitable for automotive camera modules, industrial solenoid drivers, high-side N-FET gate supplies, and VIN-tracking bias rails requiring stable component supply across extended temperature ranges.

Supply support for LTC3290HMSE#PBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC3290 product line delivers high-voltage, low-quiescent-current charge pumps optimized for automotive-grade power management where reliability, wide input range, and compact inductorless design are critical.

FAQ

What is the maximum allowable voltage difference between VIN and VAUX for the LTC3290HMSE#PBF?

The absolute maximum rating specifies VIN to VAUX voltage difference as 60V. This allows asymmetric operation - for example, VIN = 12V and VAUX = 55V - provided neither pin exceeds its individual –60V to +60V rating. Exceeding 60V differential risks permanent damage per Absolute Maximum Ratings table on page 2 of the datasheet.

Can the LTC3290HMSE#PBF operate with only one input supply, or does it require both VIN and VAUX?

The LTC3290HMSE#PBF requires both VIN and VAUX to function: VIN powers the main charge pump path and internal logic, while VAUX supplies the flying capacitor charging phase. If VAUX is unpowered, the device cannot transfer charge and will not regulate VOUT. Both supplies must be within 4.5V–55V and properly bypassed.

How does the PGOOD pin behave in VIN-tracking mode versus standard boost mode for the LTC3290HMSE#PBF?

In standard boost mode (VSET = GND), PGOOD asserts high-Z when VOUT reaches 95%–98% of the programmed value. In VIN-tracking mode, PGOOD uses absolute voltage thresholds: rising at VOUT – VIN = –1.5V and falling at VOUT – VIN = –1.6V. This ensures reliable sequencing even as VIN varies widely, unlike boost mode's percentage-based detection.

What is the purpose of the exposed pad (Pin 11) on the LTC3290HMSE#PBF, and how must it be connected?

The exposed pad (Pin 11) is electrically and thermally connected to GND. It must be soldered to a dedicated PCB ground plane area using multiple vias to achieve the rated θJA = 45°C/W. Leaving it unconnected or floating causes thermal overload, regulation failure, and potential device destruction under load - per Package Description section on page 13.

Does the LTC3290HMSE#PBF support true shutdown with zero current draw from VIN and VAUX?

No. In shutdown (EN = low), the LTC3290HMSE#PBF draws 3µA typical from VIN and 1µA typical from VAUX - not zero. This ultra-low quiescent current enables long-term battery operation but does not eliminate supply loading entirely. The internal BIAS regulator remains active to support fast wake-up, as confirmed in the Shutdown Mode section on page 8.