Diodes Incorporated APM8601FB-7

Overview

APM8601FB-7 from Diodes Incorporated is a dual-input (USB/DC), single-cell linear Li-ion battery charger IC with 28V input OVP, resistor-programmable charge current up to 1A, capacitor-programmable charge timer, and integrated thermal foldback protection. It implements full-charge sequencing-prequal, constant-current/constant-voltage fast-charge, and top-off-with three status outputs (POK, CHG, FLT) and thermistor-based temperature monitoring for portable consumer devices.

For engineers reviewing the APM8601FB-7 datasheet, APM8601FB-7 pinout, APM8601FB-7 application, or APM8601FB-7 equivalent, key selection criteria include dual-input priority logic (DC > USB), USEL-selectable USB current (90mA/475mA), RSETI-based current programming (1.5–5.0 kΩ), CT-capacitor timing accuracy (±20%), and U-DFN3030-14 thermal pad layout requirements.

Technical Context

The APM8601FB-7 integrates dual-input arbitration logic that prioritizes DC over USB when both are valid, with independent input voltage monitoring (UVLO at 4.0V, OVLO at 7.5V). Its linear charging architecture uses internal PMOS pass devices with 0.5–0.8Ω R_DS(on), enabling precise 4.2V ±21mV battery regulation and thermal foldback activation above +100°C junction temperature.

Charging state control is fully autonomous: prequal triggers below 3.0V BAT, transitions to fast-charge at 3.0V, and enters top-off when charge current falls to 7.5% of I_CHARGE. Fault detection relies on hard timers (34.8 min prequal, 334 min fast-charge) tied to CT capacitor value and is latched until EN or power cycle resets FLT.

Key Specifications

Pinout & Package

APM8601FB-7 is housed in a U-DFN3030-14 package with exposed thermal pad (EP), optimized for compact PCB layouts and thermal dissipation in space-constrained battery-powered devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and MCP73831T-2DCI/OT, the APM8601FB-7 uniquely combines dual-input priority, capacitor-programmable timers, and analog thermal foldback in a 3×3 mm DFN-enabling standalone, firmware-free operation in thermally constrained portable designs.

Availability

APM8601FB-7 is available at Aetrix Electronics and suitable for handheld consumer devices, cell phones & PDAs, digital still cameras, and handheld test equipment requiring stable component supply and long-term lifecycle support.

Supply support for APM8601FB-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for high-volume electronics markets.

The APM8601FB-7 belongs to Diodes' battery management IC product line, designed specifically for cost-sensitive, space-constrained portable devices requiring robust, autonomous single-cell Li-ion charging without microcontroller dependency.

FAQ

What does "NOT RECOMMENDED FOR NEW DESIGN" mean for APM8601FB-7?

This designation indicates Diodes Incorporated has discontinued active development and new design-in support for the APM8601FB-7, though it remains in production and available for existing programs. It reflects strategic portfolio rationalization-not obsolescence-and Aetrix maintains full supply continuity, including lifecycle coordination and last-time-buy planning for legacy designs.

How is USB vs. DC input priority enforced in APM8601FB-7?

The APM8601FB-7 uses internal analog comparators to monitor both inputs simultaneously. When DC voltage exceeds 4.15V and remains within 4.15–7.00V, it automatically overrides USB regardless of USB voltage level. USB charging only activates if DC is absent or invalid (e.g., <4.15V or >7.5V), ensuring predictable power-path behavior without external logic.

Can the APM8601FB-7 safely charge a Li-Po battery?

Yes-the APM8601FB-7's 4.200V ±21mV regulation voltage and charge algorithm (prequal → CC/CV → top-off) are fully compatible with standard single-cell Li-Po batteries. Its thermal foldback and timer-based fault detection further enhance safety for polymer chemistry, provided the external thermistor is correctly placed near the cell.

What happens to the FLT pin after a fault condition is triggered?

The FLT pin is an open-drain output that latches low upon prequal or fast-charge timeout and remains asserted until either the EN pin is cycled (toggled high then low) or main power is removed and reapplied. This ensures persistent fault indication for system-level diagnostics without requiring continuous polling or external memory.