Skyworks Solutions Inc. AAT3683IVN-4.2-4-T1

Overview

AAT3683IVN-4.2-4-T1 from Skyworks Solutions is a 1A linear single-cell Li-ion/polymer battery charger IC designed for USB or AC adapter input (4.0–7.5V), delivering precise 4.2V constant-voltage regulation and programmable 100–1000mA constant-current charging. It integrates reverse-blocking diode, current sensing, thermal loop control, and dual-status LED outputs for charge state indication in compact portable electronics.

For engineers reviewing the AAT3683IVN-4.2-4-T1 datasheet, AAT3683IVN-4.2-4-T1 pinout, AAT3683IVN-4.2-4-T1 application, or AAT3683IVN-4.2-4-T1 equivalent, this device supports rapid Li-ion charging with digital thermal regulation, programmable termination, automatic recharge sequencing, and fault protection including over-voltage, over-temperature, and short-circuit shutdown - critical for space-constrained, thermally sensitive battery-powered designs.

Technical Context

The AAT3683IVN-4.2-4-T1 implements a linear charging architecture with an internal N-channel pass transistor (R_DS(ON) = 0.5–0.7Ω at V_IN = 5V) and digitally controlled thermal loop that dynamically reduces charge current when junction temperature exceeds 115°C, resuming full current as conditions normalize. It uses external R_SET and R_TERM resistors to set charge current (100–1000mA) and termination threshold (default 10% I_{CH_CC}).

It features dual open-drain status outputs (STAT1/STAT2) for discrete LED indication of charge enable, active charging, completion, and fault states; includes TS pin for battery temperature monitoring using any thermistor; and employs a 75μA current source on TS for AAT3683-4 variants. The CT pin supports programmable watchdog timeout (25 min trickle / 3 hr CC+TC / 3 hr CV) via external capacitor.

Key Specifications

Pinout & Package

Package: QFN33-16 (3.0 × 3.0 mm, 0.5 mm pitch), thermally enhanced with exposed paddle (EP) connected to GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Li-ion battery charger applications.

Compared with BQ24075RGTR and TP4056, the AAT3683IVN-4.2-4-T1 delivers superior thermal intelligence via its digital loop, comprehensive fault reporting through dual STAT pins, and flexible TS interface - making it optimal for premium portable electronics demanding reliability and user safety.

Availability

AAT3683IVN-4.2-4-T1 is available at Aetrix Electronics and suitable for Bluetooth headsets, portable media players, smart wearables, and digital still cameras requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for AAT3683IVN-4.2-4-T1 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

Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, power management, and precision analog ICs for mobile, automotive, and IoT markets.

The AAT3683IVN-4.2-4-T1 belongs to Skyworks' BatteryManager™ family - engineered specifically for space- and thermal-constrained Li-ion charging in portable consumer electronics, emphasizing integration, safety, and autonomous operation.

FAQ

What is the exact package type and footprint of the AAT3683IVN-4.2-4-T1?

The AAT3683IVN-4.2-4-T1 uses the QFN33-16 package: 3.0 mm × 3.0 mm body, 0.5 mm lead pitch, 16-pin configuration with exposed thermal pad (EP). Pin 1 is located at the top-left corner per standard top-view marking; the EP must be soldered to a dedicated GND copper area for thermal and electrical integrity. This matches the AAT3683-4 variant described in the official Skyworks datasheet.

How does the digital thermal loop in the AAT3683IVN-4.2-4-T1 differ from conventional thermal foldback?

The AAT3683IVN-4.2-4-T1 implements a digitally controlled thermal loop that actively samples junction temperature and adjusts charge current in discrete steps - entering at 115°C and exiting at 85°C - rather than analog-only foldback. It begins at 44% of programmed current and incrementally increases every 3 seconds until equilibrium or full current is restored, maximizing usable charge rate under thermal constraint.

Can the AAT3683IVN-4.2-4-T1 charge batteries other than 4.2V Li-ion cells?

No - the AAT3683IVN-4.2-4-T1 is factory trimmed for 4.20V ±0.5% constant-voltage regulation and is specified exclusively for single-cell Li-ion and Li-polymer batteries. It does not support adjustable CV output or alternative chemistries (e.g., LiFePO₄ or 4.35V cells); attempting to use it outside this specification risks overcharging and safety hazards.

What are the minimum and maximum values for R_SET to achieve full 100–1000mA charge current range with the AAT3683IVN-4.2-4-T1?

Per the Skyworks datasheet, R_SET values range from 1.58 kΩ (1000 mA) to 16.2 kΩ (100 mA). A 1% metal film resistor is recommended for accuracy. Values outside this range - such as <1.5 kΩ or >17 kΩ - result in out-of-spec current levels or unstable regulation; the IC does not clamp or limit beyond these boundaries.

Does the AAT3683IVN-4.2-4-T1 support automatic recharge, and how is the recharge threshold determined?

Yes - the AAT3683IVN-4.2-4-T1 supports automatic recharge when battery voltage falls below VRCH, which is internally set to VBAT_EOC − 0.1V (i.e., ~4.10–4.14V depending on temperature). This threshold is fixed and not user-programmable; recharge initiates immediately upon crossing VRCH, provided EN is high and no fault condition persists.