Analog Devices Inc. LTC3588IMSE-2#PBF

Overview

LTC3588IMSE-2#PBF from Analog Devices (formerly Linear Technology) is an ultralow-quiescent-current energy harvesting power supply IC integrating a full-wave bridge rectifier and synchronous buck regulator. It operates from 14V to 20V input, delivers up to 100mA output current at pin-selectable voltages (3.45V/4.1V/4.5V/5.0V), and features 16V UVLO with 2V hysteresis for efficient piezoelectric source utilization - deployed in wireless HVAC sensors and industrial tire pressure monitoring systems.

For engineers reviewing the LTC3588IMSE-2#PBF datasheet, LTC3588IMSE-2#PBF pinout, LTC3588IMSE-2#PBF application, or LTC3588IMSE-2#PBF equivalent, key selection criteria include its 830nA UVLO quiescent current, integrated 20V input shunt protection, hysteretic buck architecture, 10-lead MSOP package with exposed ground pad, and compatibility with high-impedance AC sources like PZT transducers.

Technical Context

The LTC3588IMSE-2#PBF implements a nanopower hysteretic buck regulator controlled by internal sleep/wake comparators referenced to user-selected VOUT thresholds (±16mV hysteresis). Its integrated full-wave bridge rectifier supports differential AC inputs up to ±50mA with ~400mV total forward drop at 10µA, enabling direct connection to piezoelectric elements without external diodes.

Internal rail generation produces CAP (VIN–4.8V) for PMOS gate drive and VIN2 (4.8V above GND) for NMOS gate drive and D0/D1 logic reference. The PGOOD signal asserts logic-high when VOUT exceeds 92% of target and remains asserted until VOUT falls below that threshold or VIN drops below UVLO falling (14V).

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (MSE), 3mm × 4.9mm body, exposed GND pad (Pin 11) requiring solder connection to PCB ground plane per Linear Technology layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar energy harvesting power supply applications.

Compared with ADP5090ACPZ-1-R7 and BQ25504RGTT, the LTC3588IMSE-2#PBF uniquely combines high-input-voltage tolerance (14–20V), integrated bridge rectification, and 20V shunt protection - making it the only option qualified for unconditioned piezoelectric transducers in harsh mechanical environments.

Availability

LTC3588IMSE-2#PBF is available at Aetrix Electronics and suitable for wireless sensor networks, industrial IoT edge nodes, and battery-free condition monitoring systems requiring stable component supply across extended production lifecycles.

Supply support for LTC3588IMSE-2#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 acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with full datasheet, simulation model, and application support.

The LTC3588-2 product line was designed specifically for nanopower energy harvesting from high-impedance AC sources such as piezoelectric, electro-mechanical, and magnetic transducers - targeting maintenance-free wireless sensing in industrial and automotive environments.

FAQ

What is the minimum input voltage required for the LTC3588IMSE-2#PBF to begin regulation?

The LTC3588IMSE-2#PBF enters regulation when VIN rises above the undervoltage lockout (UVLO) rising threshold of 16.0V (typical). Below this voltage, the buck converter remains disabled and the device draws only 830nA quiescent current. This high UVLO threshold is intentional to maximize energy extraction from piezoelectric sources with open-circuit voltages exceeding 16V.

Can the LTC3588IMSE-2#PBF operate with a single-ended DC input instead of an AC piezoelectric source?

Yes - the LTC3588IMSE-2#PBF can accept a single-ended DC input applied to the PZ1 pin while leaving PZ2 grounded, effectively using half the internal bridge rectifier. However, the full-wave configuration (differential PZ1/PZ2) is required to achieve the specified 400mV bridge drop and ±50mA current capability. For DC inputs, ensure VIN stays within 14–20V and does not exceed the 20V internal clamp.

How does the PGOOD pin behave when the input voltage drops below UVLO falling threshold?

When VIN falls below the UVLO falling threshold (14.0V typical), the LTC3588IMSE-2#PBF disables the buck converter but holds PGOOD high until VOUT drops to 92% of its programmed value. This allows downstream circuitry to continue operating from stored output capacitance even after input energy is lost - a critical feature for burst-mode wireless transmission in energy harvesting systems.

What is the recommended output capacitor value for stable 100mA load operation with the LTC3588IMSE-2#PBF?

For continuous 100mA loads, Analog Devices recommends ≥47µF low-ESR ceramic or tantalum output capacitance rated for the selected VOUT (e.g., 6.3V for 5.0V output). Smaller values (e.g., 10µF) increase VOUT ripple and extend sleep time unpredictably due to comparator delays; values below 10µF are not recommended as they cause excessive ripple beyond ±16mV hysteresis.

Does the LTC3588IMSE-2#PBF require external compensation components for the buck regulator?

No - the LTC3588IMSE-2#PBF uses a hysteretic control architecture that requires no external compensation. Regulation is achieved through internal comparators monitoring VOUT against programmable sleep/wake thresholds (±16mV around target), eliminating loop-stability concerns and reducing bill-of-materials. The only external components required are input/output capacitors, inductor, and D0/D1 pull-up/pull-down resistors.