Analog Devices Inc. LTC3586EUFE#PBF

Overview

LTC3586EUFE#PBF from Analog Devices (formerly Linear Technology) is a highly integrated USB power manager IC for Li-Ion/Polymer battery systems, featuring a switching PowerPath controller with automatic load prioritization, full-featured battery charger (4.2V float, 1.5A max), ideal diode, dual synchronous bucks (400mA each), buck-boost (1A), and boost (800mA). It delivers <30µA no-load quiescent current from battery and operates in –40°C to 85°C.

For engineers reviewing the LTC3586EUFE#PBF datasheet, LTC3586EUFE#PBF pinout, LTC3586EUFE#PBF application, or LTC3586EUFE#PBF equivalent, key selection criteria include USB-compliant current limiting (100/500/1000mA), Bat-Track adaptive output control, programmable charge voltage (4.2V), and compact 38-pin 4mm × 6mm QFN package with exposed thermal pad.

Technical Context

The LTC3586EUFE#PBF implements a multi-regulator architecture with four independent switching regulators: two pulse-skip/burst-mode bucks (VIN1/VIN2), one buck-boost (VIN3/VOUT3) with Type III compensation via VC3, and one boost (VIN4/VOUT4) with adjustable 5V output. All regulators servo FBx pins to 0.80V ±20mV and support 1.8–2.7MHz switching frequency.

Its PowerPath controller uses a 180mΩ internal PMOS and 300mΩ NMOS to manage VBUS-to-VOUT power flow with adaptive Bat-Track output control, while the battery charger integrates CC/CV regulation, thermal foldback, NTC-based temperature monitoring, and C/10 termination detection. The device supports five operating modes (1x/5x/10x/Suspend/Battery-only) controlled by ILIM0/ILIM1 and MODE pins.

Key Specifications

Pinout & Package

The LTC3586EUFE#PBF is housed in a low-profile 38-pin 4mm × 6mm plastic QFN (UFE package) with exposed thermal pad (Pin 39 = GND), optimized for high-density portable designs and requiring soldering of the pad for thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB power management applications.

Compared with BQ24195RGER and MAX77818EWJ+T, the LTC3586EUFE#PBF uniquely integrates all four regulator topologies plus PowerPath and ideal diode control in one QFN, eliminating six to eight external ICs in USB-A handhelds.

Availability

LTC3586EUFE#PBF is available at Aetrix Electronics and suitable for digital still cameras, HDD-based MP3 players, GPS navigation devices, USB-powered PDAs, and other USB-based handheld products requiring stable component supply and long-term lifecycle support.

Supply support for LTC3586EUFE#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 high-performance analog and power management portfolio with rigorous automotive and industrial qualification standards.

The LTC3586EUFE#PBF belongs to Linear's USB Power Management IC family, designed specifically for space-constrained, battery-backed portable electronics requiring simultaneous charging, load powering, and multiple regulated rails from a single USB source.

FAQ

What is the battery charge voltage setting for LTC3586EUFE#PBF?

The LTC3586EUFE#PBF is the standard LTC3586 variant with a fixed 4.200V ±21mV float voltage, optimized for standard single-cell Li-Ion batteries. This differs from the LTC3586-1 variant (4.100V), and the setting is internal-no external resistor or register programming is required. The LTC3586EUFE#PBF maintains this voltage across –40°C to 85°C with ±5mV drift.

Does LTC3586EUFE#PBF support USB suspend mode?

Yes, LTC3586EUFE#PBF supports USB suspend mode via ILIM0/ILIM1 pin configuration (0,0 → 1x; 1,0 → Suspend). In suspend mode, VBUS quiescent current drops to 0.38mA typical, VOUT is regulated to 4.6V, and battery charging halts. The device remains fully functional and resumes normal operation upon VBUS voltage rise above 4.35V.

How does the LTC3586EUFE#PBF handle power priority between load and battery?

The LTC3586EUFE#PBF implements automatic load prioritization: it first supplies the external load on VOUT, then allocates any remaining input power to battery charging. If VBUS is removed or insufficient, the internal ideal diode seamlessly transfers power from BAT to VOUT. This "instant-on" behavior ensures uninterrupted system operation without firmware intervention.

What is the purpose of the GATE pin on LTC3586EUFE#PBF?

Pin 31 (GATE) on the LTC3586EUFE#PBF is an analog output that drives the gate of an external P-channel MOSFET connected between VOUT and BAT. It supplements the internal 180mΩ ideal diode to reduce forward voltage drop-enabling <15mV drop at 1A versus ~200mV with internal diode alone. The GATE pin must be left floating if no external FET is used.

Can LTC3586EUFE#PBF operate without an NTC thermistor?

Yes, LTC3586EUFE#PBF can operate without an NTC thermistor: the NTC pin (Pin 5) must be grounded to disable temperature monitoring. When disabled, battery charging proceeds regardless of temperature, but thermal safety protection is forfeited. For production designs, Analog Devices recommends retaining the NTC circuit with a 10kΩ thermistor and bias resistor to meet IEC 62368-1 requirements.