Diodes Incorporated AUR9807DIGD

Overview

AUR9807DIGD from Diodes Incorporated is a single-cell Li-ion battery charger IC with integrated Active Power Management (APM), designed for simultaneous system power delivery and battery charging in portable electronics. It supports 5V nominal system output, up to 1.5A programmable charge current via ISET1, 40mΩ BAT-to-OUT power path, and automatic AC/USB source selection. Used in mobile phones and digital cameras where input-limited adapters require dynamic current allocation between load and battery.

For engineers reviewing the AUR9807DIGD datasheet, AUR9807DIGD pinout, AUR9807DIGD application, or AUR9807DIGD equivalent, key selection criteria include its APM regulation threshold (2.6–3.8V), thermal foldback at 110°C, 5V output version (DI suffix), QFN-4.5×3.5-20 package, and dual-mode current limiting (AC vs. USB).

Technical Context

The AUR9807DIGD implements adaptive power source arbitration using internal MOSFETs Q1 and Q2, with automatic fallback to battery supply when input voltage drops below VBAT – 60mV. Its APM function dynamically reduces charging current to maintain VOUT ≥ VAPM-REG (programmable via APM pin), prioritizing system load over battery charge.

Charging control uses dual-stage regulation: constant-current (CC) phase set by ISET1 resistor and VSET = 2.5V (typ), followed by constant-voltage (CV) termination at 4.2V ±0.5% with 10–150mA termination detection. Thermal regulation activates at TJ = 110°C (Q2) and shutdown occurs at 150°C (Q1/Q3).

Key Specifications

Pinout & Package

Package: QFN-4.5×3.5-20 with exposed thermal pad (D package). Pin count: 20. Mounting compatible with standard reflow profiles per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-cell Li-ion charger with system power management applications.

Compared with BQ24075RGTR and TP4056, the AUR9807DIGD uniquely integrates APM, 5V system regulation, and 40mΩ battery path-enabling robust operation under variable input and high-load conditions without external components.

Availability

AUR9807DIGD is available at Aetrix Electronics and suitable for mobile phones, digital cameras, and MP3 players requiring stable component supply with RoHS-compliant packaging and traceable sourcing.

Supply support for AUR9807DIGD 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 consumer, industrial, and automotive markets.

The AUR9807 belongs to Diodes' battery management IC product line, engineered for portable devices needing intelligent power arbitration between adapter input and Li-ion battery-balancing charge efficiency, thermal safety, and system uptime.

FAQ

What is the function of the APM pin on the AUR9807DIGD?

The APM pin sets the Active Power Management regulation threshold (VAPM-SET), which is multiplied by a fixed scale factor (1.139–1.162) to determine VAPM-REG-the minimum system output voltage maintained under load. When VOUT falls to this level, the IC reduces charging current to prioritize system power delivery. No external capacitor is required, and the pin accepts 2.6–3.8V analog input.

How does the AUR9807DIGD handle power source switching between USB and AC adapter?

The MODE pin selects between USB (Low) and AC (High) modes. In AC mode, total current is unregulated but managed by APM; in USB mode, total current is limited to 90mA or 450mA based on ISET2 state. The IC automatically detects input presence via VIN(DT) > VBAT + 55–130mV and switches seamlessly-no external control logic is needed.

What thermal protection mechanisms does the AUR9807DIGD implement?

The AUR9807DIGD features two-tier thermal protection: junction temperature regulation at 110°C (Q2) initiates current foldback to reduce power dissipation, while thermal shutdown triggers at 150°C (Q1/Q3) with 25°C hysteresis. Temperature sensing uses the TS pin with a 95–105μA current source and comparator thresholds at 0.5V (high-temp) and 2.5V (low-temp).

Can the AUR9807DIGD operate without an external ISET1 resistor?

No. The ISET1 pin requires an external resistor to ground to set the maximum charging current. With VSET = 2.5V (typ) and KSET = 375–450 (10mA units), a 1.67kΩ resistor yields ~1.5A charge current. Omitting the resistor disables charge current programming, preventing functional charging-this pin is not internally terminated and must be externally configured.