Analog Devices Inc. ADP3810AR-16.8

Overview

ADP3810AR-16.8 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 16.8 V, and low-voltage-drop current sensing (−300 mV full-scale). It directly drives the diode side of an optocoupler for isolated feedback control in flyback or buck converters.

For engineers reviewing the ADP3810AR-16.8 datasheet, ADP3810AR-16.8 pinout, ADP3810AR-16.8 application, or ADP3810AR-16.8 equivalent, key selection considerations include its fixed 16.8 V final voltage option for 4-cell Li-ion stacks, SO-8 package compatibility, UVLO threshold (2.7 V turn-on), and integrated 2.000 V reference with ±1.0% accuracy over −40°C to +85°C.

Technical Context

The ADP3810AR-16.8 integrates two high-gain transconductance amplifiers (GMI for current loop, GM2 for voltage loop) sharing a common COMP node, enabling analog "OR" mode operation-only one amplifier actively controls the output at any time. Its internal thin-film resistor divider sets the precise 16.8 V final battery voltage, referenced to the 2.000 V bandgap reference.

It features a buffered, high-impedance VCTRL input (0–1.2 V range) that programs charge current via external sense resistor (e.g., 0.25 Ω), and an output stage delivering ≥4 mA sink current at <0.4 V saturation to drive optocouplers directly. Undervoltage lockout disables operation below 2.6 V, ensuring stable startup and fault protection.

Key Specifications

Pinout & Package

ADP3810AR-16.8 is housed in an SO-8 surface-mount package (JEDEC MS-012AC, 150 mil width), with pins arranged in standard dual-inline configuration. Thermal pad is not present; power dissipation limited to 500 mW.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADP3810AR-12.6 and ADP3811AR, the ADP3810AR-16.8 delivers guaranteed 16.8 V termination accuracy without external components-reducing bill-of-materials cost and improving long-term reliability in fixed 4-cell Li-ion applications where voltage tolerance is critical.

Availability

ADP3810AR-16.8 is available at Aetrix Electronics and suitable for industrial battery chargers, medical portable devices, telecom backup systems, and ruggedized power tools requiring stable component supply and long-lifecycle support.

Supply support for ADP3810AR-16.8 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.

The ADP3810 belongs to Analog Devices' dedicated battery management IC product line, engineered specifically for isolated, off-line Li-ion charging applications where accuracy, reliability, and minimal external component count are essential.

FAQ

What is the exact final battery voltage setpoint for ADP3810AR-16.8?

The ADP3810AR-16.8 is factory trimmed to deliver a precise 16.8 V final battery voltage for 4-cell Li-ion stacks. This value is achieved using internal laser-trimmed thin-film resistors forming a 840 kΩ/1.5 MΩ divider referenced to the 2.000 V bandgap. The specification guarantees ±1.0% total error-including reference, divider, and amplifier contributions-over −40°C to +85°C.

Can ADP3810AR-16.8 operate with a supply voltage lower than 16.8 V?

Yes, ADP3810AR-16.8 operates with supply voltages as low as 2.7 V while regulating a 16.8 V battery. Its internal resistive divider scales the 16.8 V battery voltage down to 2.000 V at the VSENSE input, decoupling VCC requirements from battery voltage. This allows use with low-voltage auxiliary supplies-even in flyback topologies where VCC is derived from bias winding.

Does ADP3810AR-16.8 support charge termination detection for Li-ion batteries?

No, ADP3810AR-16.8 does not implement charge termination algorithms such as −dV/dt or timer cutoff. It provides only precision voltage and current regulation. For full Li-ion charge management, external circuitry-such as a microcontroller monitoring battery voltage and temperature-is required to disable charging upon reaching 16.8 V and entering saturation.

What optocoupler types are compatible with the ADP3810AR-16.8 OUT pin?

The ADP3810AR-16.8 OUT pin is designed to directly drive standard single-channel optocouplers with CTR ≥100%, such as the MOC8103, PC817, or TLP785. With ≥4 mA sink capability and <0.4 V saturation voltage at VCC = 2.7 V, it meets forward current requirements for these devices without external buffering-simplifying isolated feedback design.

How is charge current programmed on ADP3810AR-16.8?

Charge current is programmed via the VCTRL pin using a 0–1.2 V DC voltage. With a 0.25 Ω sense resistor and 20 kΩ R3, this yields 100 mA at 0.1 V and 1.2 A at 1.2 V. The high-impedance input (≤40 nA bias) accepts filtered PWM outputs or DAC signals. Internal 80 kΩ resistor and buffer ensure accurate scaling independent of external resistor tolerances.