Analog Devices Inc. ADP3810AR-8.4-REEL

Overview

ADP3810AR-8.4-REEL from Analog Devices is a precision Li-ion battery charger controller IC designed for secondary-side, isolated off-line charging systems. It provides constant-current/constant-voltage regulation with programmable charge current (100 mA to 1.2 A), ±1.0% final battery voltage accuracy at 8.4 V, and low 300 mV full-scale current sense voltage. It drives the diode side of an optocoupler directly for isolated feedback control in flyback-based chargers.

For engineers reviewing the ADP3810AR-8.4-REEL datasheet, ADP3810AR-8.4-REEL pinout, ADP3810AR-8.4-REEL application, or ADP3810AR-8.4-REEL equivalent, this device serves as a dedicated 2-cell Li-ion (8.4 V) charging controller with integrated 2.000 V reference, UVLO, overvoltage comparator, and dual-GM error amplifiers - critical for high-accuracy, low-component-count battery management in medical, portable, and industrial power supplies.

Technical Context

The ADP3810AR-8.4-REEL implements an analog "OR" control architecture using two independent GM-type error amplifiers: GMI regulates charge current via external sense resistor voltage (–300 mV full scale), while GM2 regulates battery voltage using an internal precision voltage divider set to 8.4 V (2 × 4.2 V). Both share a common COMP node compensated by a single RC network.

It features a buffered, high-impedance VCTRL input (0–1.2 V) that sets charge current without external DACs; a 2.000 V reference with ±1.0% accuracy and 35 µV_P-P noise (0.1 Hz–10 Hz); and an open-collector output stage capable of sourcing up to 6 mA to drive optocouplers directly - enabling galvanic isolation in offline flyback topologies.

Key Specifications

Pinout & Package

ADP3810AR-8.4-REEL is housed in an SO-8 surface-mount package with standard JEDEC MS-012AC footprint (4.9 mm × 3.9 mm, 1.27 mm pitch).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery charger controller applications.

Compared with ADP3810AR-4.2-REEL, ADP3810AR-8.4-REEL enables direct 2-cell charging without external scaling resistors, while MAX1736ESA+ adds complexity for multi-chemistry support but sacrifices the ultra-low component count and optocoupler-native drive of the ADP3810 series.

Availability

ADP3810AR-8.4-REEL is available at Aetrix Electronics and suitable for medical portable devices, industrial handheld analyzers, automotive diagnostic tools, and telecom remote site backup power systems requiring stable component supply and long-lifecycle support.

Supply support for ADP3810AR-8.4-REEL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and power management markets since 1965.

The ADP3810 product line delivers isolated secondary-side battery charger controllers optimized for Li-ion chemistries, emphasizing accuracy, integration, and ease of use in offline flyback and buck-derived architectures.

FAQ

What is the exact final battery voltage setting for ADP3810AR-8.4-REEL?

The ADP3810AR-8.4-REEL is factory trimmed to regulate precisely at 8.4 V - corresponding to two series-connected Li-ion cells at 4.2 V each. This value is achieved via internal laser-trimmed thin-film resistors and is guaranteed to ±1.0% over –40°C to +85°C, including all errors from reference, offset, and divider mismatch. No external resistors are needed or supported for this fixed option.

Can ADP3810AR-8.4-REEL operate with a supply voltage lower than the battery voltage?

Yes. ADP3810AR-8.4-REEL operates from 2.7 V to 16 V and is specifically designed to function with V_CC below battery voltage. Its VSENSE input is internally divided and referenced to the 2.000 V bandgap, allowing it to accurately monitor up to 16.8 V battery stacks even when powered from a 2.7 V auxiliary rail - a key enabler for isolated offline charger designs.

How does ADP3810AR-8.4-REEL handle charge current programming?

ADP3810AR-8.4-REEL uses its VCTRL pin (0–1.2 V, high-impedance) to linearly set charge current. With a typical 0.25 Ω sense resistor and 20 kΩ R3, 1.0 V on VCTRL yields ~1.0 A charge current. The internal 80 kΩ resistor is trimmed for accuracy, and the buffer's 25 nA bias current minimizes error. PWM filtering or DAC outputs can drive VCTRL directly due to its high-Z nature.

Does ADP3810AR-8.4-REEL include overvoltage protection for the battery?

Yes. ADP3810AR-8.4-REEL includes an overvoltage comparator that triggers when battery voltage exceeds 6% above full scale (i.e., >8.904 V for the 8.4 V option). Upon detection, it rapidly increases OUT current to clamp the dc-dc converter, limiting transient overshoot and protecting both battery and downstream circuitry - independent of the main GM2 voltage loop.

What is the purpose of the COMP pin on ADP3810AR-8.4-REEL?

The COMP pin is the shared compensation node for both the current (GMI) and voltage (GM2) error amplifiers. A single RC network from COMP to GND provides dominant-pole compensation for the voltage loop (<100 Hz), while also influencing the current loop. For optimal stability across both loops, Analog Devices recommends adding a second high-frequency RC network if crossover frequencies differ significantly in the target application.