Analog Devices Inc. LTC3586EUFE#TRPBF

Overview

LTC3586EUFE#TRPBF from Analog Devices (formerly Linear Technology) is a highly integrated USB power manager IC for Li-Ion/Polymer battery systems. It integrates a switching PowerPath manager with Bat-Track adaptive output control, full-featured battery charger (4.2V float, 1.5A max), ideal diode, and four synchronous regulators: dual bucks (400mA each), buck-boost (1A), and boost (800mA). It delivers "instant-on" operation and automatic load prioritization in compact handheld USB devices.

For engineers reviewing the LTC3586EUFE#TRPBF datasheet, LTC3586EUFE#TRPBF pinout, LTC3586EUFE#TRPBF application, or LTC3586EUFE#TRPBF equivalent, key selection considerations include USB current limit configuration (100/500/1000mA), battery charge voltage (4.2V vs 4.1V variant), VOUT regulation range (3.5–4.7V), quiescent current in suspend mode (0.38mA), and thermal regulation at 110°C junction temperature.

Technical Context

The LTC3586EUFE#TRPBF implements a multi-regulator architecture with independent control loops: two pulse-skip/burst-mode bucks (VIN1/VIN2), a buck-boost (VIN3) with Type III compensation via VC3, and a boost (VIN4) with adjustable overvoltage shutdown (5.1–5.5V). Its PowerPath controller uses adaptive Bat-Track to maintain VOUT = BAT + 0.3V until BAT reaches 4.2V, then holds VOUT at 4.7V.

It features programmable USB/wall current limiting via ILIM0/ILIM1 pins, CLPROG-based current monitoring, NTC-based thermal charging safety, and an always-on 3.3V LDO (LDO3V3) with 3.1–3.5V regulation and 20mA capability - all in a single 38-pin 4mm × 6mm QFN package with exposed thermal pad (Pin 39 = GND).

Key Specifications

Pinout & Package

Package: 38-pin (4mm × 6mm × 0.75mm) plastic QFN with exposed thermal pad (Pin 39 = GND, must be soldered to PCB).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC3586-1EUFE#TRPBF, the LTC3586EUFE#TRPBF provides 100mV higher battery float voltage for standard Li-Ion termination, while MAX77818EWL+ offers USB-C PD readiness at the cost of missing the dedicated 800mA boost rail needed for camera flash or USB OTG power.

Availability

LTC3586EUFE#TRPBF is available at Aetrix Electronics and suitable for digital still cameras, HDD-based MP3 players, and GPS navigation devices requiring stable component supply across production lifecycles.

Supply support for LTC3586EUFE#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 continues its legacy of high-performance analog and power management ICs.

The LTC3586EUFE#TRPBF belongs to Linear's USB Power Management family, designed specifically for space-constrained, battery-powered USB peripherals requiring intelligent power routing, multi-rail generation, and safe Li-Ion charging.

FAQ

What is the battery float voltage of the LTC3586EUFE#TRPBF?

The LTC3586EUFE#TRPBF has a fixed battery float voltage of 4.200V ±21mV, optimized for standard single-cell Li-Ion and Li-Polymer batteries. This value is confirmed in the Electrical Characteristics table (VFLOAT parameter) and is distinct from the LTC3586-1 variant, which specifies 4.100V. The LTC3586EUFE#TRPBF uses this voltage to terminate constant-current charging and enter constant-voltage mode, ensuring full capacity without overvoltage stress.

How does the PowerPath controller in the LTC3586EUFE#TRPBF prioritize power between load and battery?

The LTC3586EUFE#TRPBF implements automatic load prioritization: it first supplies the external load on VOUT, then allocates any remaining input power to battery charging. When VBUS is present, the PowerPath switching regulator delivers power to VOUT while simultaneously charging the battery at up to 1.5A - but only after satisfying the load demand. If load current exceeds available VBUS current, the ideal diode draws supplemental power from BAT to maintain VOUT regulation, preventing system brownout.

Can the LTC3586EUFE#TRPBF support USB suspend mode with ultra-low quiescent current?

Yes, the LTC3586EUFE#TRPBF supports USB suspend mode with a typical VBUS quiescent current of 0.38mA (max 0.50mA), as specified in the Electrical Characteristics table under IVBUSQ. This mode is activated by setting ILIM0 = 1 and ILIM1 = 0 (per Table 1), and it disables most internal regulators while retaining the always-on 3.3V LDO (LDO3V3) and basic PowerPath supervision - enabling compliant USB suspend behavior and extended battery standby in portable devices.

What is the function of the CLPROG pin on the LTC3586EUFE#TRPBF?

The CLPROG pin on the LTC3586EUFE#TRPBF serves as both the USB current limit programming and real-time monitoring node. A resistor from CLPROG to ground sets the maximum VBUS current limit (e.g., 3.01kΩ yields 500mA). Internally, the IC routes a fraction (hCLPROG = 1133mA/mA in 5x mode) of the measured VBUS current to CLPROG; the PowerPath controller regulates until CLPROG reaches 1.188V. This closed-loop method ensures accurate, temperature-stable current limiting without relying on external sense resistors.

Does the LTC3586EUFE#TRPBF include thermal protection for the battery charger?

Yes, the LTC3586EUFE#TRPBF includes multiple layers of thermal protection for the battery charger. It features a junction temperature limit of 110°C (TLIM), at which point the charger enters constant-temperature mode to prevent overheating. Additionally, the NTC pin monitors battery temperature via an external thermistor; if voltage at NTC falls outside the programmed cold (e.g., <75% VBUS) or hot (e.g., >36.4% VBUS) thresholds, charging pauses immediately. These protections are fully integrated and require no external circuitry beyond the thermistor and bias resistor.