Skyworks Solutions Inc. AAT3672IWO-4.2-3-T1

Overview

AAT3672IWO-4.2-3-T1 from Skyworks Solutions is a single-cell 4.2V Li-ion/polymer battery charger and dynamic power manager IC that simultaneously delivers system load power and charges the battery from a shared ADP input (4.0–6.5V). It supports up to 1.6A ADP charge current, programmable termination current via RTERM, and digitally controlled thermal regulation at 100°C regulated junction temperature. Used in portable devices requiring seamless source-to-load power routing and battery protection.

For engineers reviewing the AAT3672IWO-4.2-3-T1 datasheet, AAT3672IWO-4.2-3-T1 pinout, AAT3672IWO-4.2-3-T1 application, or AAT3672IWO-4.2-3-T1 equivalent, this page provides verified functional identity, validated 14-pin TDFN package mapping, confirmed dual-enable control logic (EN1/EN2), exact 4.2V ±1% charge regulation, and two field-validated alternative parts with documented interface and timing differences.

Technical Context

The AAT3672IWO-4.2-3-T1 implements a three-path dynamic power architecture: ADP-to-OUT, ADP-to-BAT, and BAT-to-OUT, each controlled by independent NMOS switches with R_DS(ON) of 600 mΩ (ADP/BAT switches) and 80 mΩ (BAT-to-OUT switch). Its charge control loop uses a fixed 4.2V regulation point with ±1% accuracy over –25°C to +85°C and supports preconditioning below 2.9V, constant-current fast charge up to 1.6A, and constant-voltage termination.

It features dual enable inputs (EN1/EN2) for USB-level charge mode selection (70–100 mA low, 400–500 mA high), a digitally controlled thermal loop entering at 115°C and exiting at 95°C, and battery temperature sensing via TS pin with 28–32% V_ADP high-threshold and 58–62% V_ADP low-threshold detection.

Key Specifications

Pinout & Package

Package: 14-pin 3 × 3 mm TDFN with exposed paddle (EP), Pb-free, thermally enhanced.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery charger and power management applications.

Compared with BQ24075RGTR and MAX1555ESA+, the AAT3672IWO-4.2-3-T1 uniquely integrates dual-USB-mode selection, 1.6A programmable charge, and a self-regulating thermal loop-enabling higher power density, safer thermal operation, and flexible USB compliance without external components.

Availability

AAT3672IWO-4.2-3-T1 is available at Aetrix Electronics and suitable for cellular phones, digital still cameras, GPS receivers, and handheld PCs requiring stable component supply, long-term lifecycle support, and guaranteed Pb-free compliance.

Supply support for AAT3672IWO-4.2-3-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 for wireless, automotive, and industrial markets.

The AAT3672IWO-4.2-3-T1 belongs to Skyworks' BatteryManager™ family, designed specifically for portable electronics requiring simultaneous battery charging and dynamic system power sourcing from single-input adapters or USB ports.

FAQ

What is the exact charge voltage regulation accuracy of the AAT3672IWO-4.2-3-T1?

The AAT3672IWO-4.2-3-T1 provides factory-trimmed charge voltage regulation at 4.20 V with ±1% accuracy over the –25°C to +85°C operating temperature range. This specification is guaranteed per Electrical Characteristics Table on page 4 of the official Skyworks datasheet (201880B), ensuring reliable full-charge termination for standard 4.2V Li-ion cells without external calibration. The AAT3672IWO-4.2-3-T1 achieves this using an internal bandgap reference and precision feedback network.

Does the AAT3672IWO-4.2-3-T1 support USB charging with selectable current levels?

Yes, the AAT3672IWO-4.2-3-T1 supports two USB charge current levels: 70–100 mA (low) and 400–500 mA (high), selected via logic states on EN1 and EN2 pins as defined in Table 2 of the datasheet. Unlike variants -1/-2, the -3 version uses dual enables for USB mode control-no external resistors or configuration registers are needed. This makes the AAT3672IWO-4.2-3-T1 compliant with both standard USB 2.0 and high-power USB charging specifications.

How does the thermal regulation loop in the AAT3672IWO-4.2-3-T1 differ from simple thermal shutdown?

The AAT3672IWO-4.2-3-T1 implements a digitally controlled thermal regulation loop-not just shutdown-that enters at 115°C and exits at 95°C, actively adjusting charge current to maintain a regulated 100°C junction temperature. This preserves charging functionality under thermal stress, unlike binary shutdown ICs. The loop dynamically responds to ambient and power-dissipation changes, allowing the AAT3672IWO-4.2-3-T1 to sustain usable charge rates where competitors would halt entirely.

What is the function of the CHRADP pin on the AAT3672IWO-4.2-3-T1?

The CHRADP pin on the AAT3672IWO-4.2-3-T1 sets the adapter input voltage threshold (default 4.5V) at which the charge reduction (CHR) loop activates to prevent input source collapse. When V_ADP falls below this threshold-due to weak USB host or overloaded adapter-the AAT3672IWO-4.2-3-T1 automatically reduces battery charge current while maintaining system load power. A voltage divider on CHRADP allows adjustment of this threshold for custom source compatibility.

Can the AAT3672IWO-4.2-3-T1 operate without a battery connected?

Yes, the AAT3672IWO-4.2-3-T1 can power the system load from ADP alone with no battery present. In this configuration, ENO must be high to enable ADP-to-OUT path, and ENBAT must remain low to disable BAT-to-OUT. The IC will not attempt charging, and STAT1 reflects "no battery" status. All protection circuits (UVLO, thermal, overvoltage) remain active, and the AAT3672IWO-4.2-3-T1 draws only 5 μA in shutdown mode when both EN1 and EN2 are low.