Analog Devices Inc. ADP3810AR-12.6-RL7

Overview

ADP3810AR-12.6-RL7 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 12.6 V, and low 300 mV full-scale current sense voltage - enabling high-efficiency control of flyback or buck DC/DC converters in portable medical and industrial battery packs.

For engineers reviewing the ADP3810AR-12.6-RL7 datasheet, ADP3810AR-12.6-RL7 pinout, ADP3810AR-12.6-RL7 application, or ADP3810AR-12.6-RL7 equivalent, this page delivers verified technical context, SO-8 package mapping, real-world Li-ion charging use cases, and two validated alternative parts with documented functional and selection differences.

Technical Context

The ADP3810AR-12.6-RL7 integrates dual GM-type error amplifiers (GMI for current loop, GM2 for voltage loop) sharing a common COMP node for coordinated feedback control. Its internal 2.000 V reference (±1.0% accuracy) and laser-trimmed thin-film resistor divider set the precise 12.6 V final voltage for 3-cell Li-ion stacks without external components.

It operates across 2.7 V to 16 V supply range, features undervoltage lockout (2.7 V turn-on), drives optocoupler diodes directly via its 4–6 mA current-output OUT pin, and supports PWM-based charge current programming via high-impedance VCTRL input (0–1.2 V range, 10–40 nA bias).

Key Specifications

Pinout & Package

ADP3810AR-12.6-RL7 is housed in an SO-8 surface-mount package (body size 4.9 mm × 6.0 mm, lead pitch 1.27 mm), rated for −40°C to +85°C operation and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADP3810AR-12.6-RL7, the ADP3810AR-8.4-RL7 offers identical architecture but targets 2-cell Li-ion, while the MAX1737ESA+ adds multi-chemistry support at the cost of increased BOM count and loss of direct optocoupler compatibility.

Availability

ADP3810AR-12.6-RL7 is available at Aetrix Electronics and suitable for medical device charging, industrial handheld power management, and telecom backup systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADP3810AR-12.6-RL7 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADP3810AR-12.6-RL7 belongs to Analog Devices' dedicated battery management IC portfolio, engineered specifically for isolated, off-line Li-ion charger applications where precision voltage regulation, low-power current sensing, and robust fault tolerance are critical.

FAQ

What is the exact final battery voltage programmed in ADP3810AR-12.6-RL7?

The ADP3810AR-12.6-RL7 is factory-trimmed to deliver a precise 12.6 V final battery voltage, corresponding to three series-connected Li-ion cells at full charge (4.2 V per cell). This value is guaranteed within ±1.0% over −40°C to +85°C, including all contributions from reference, amplifier offset, and internal resistor divider errors - no external components are required to achieve this accuracy.

Can ADP3810AR-12.6-RL7 operate with a supply voltage lower than the battery voltage?

Yes, ADP3810AR-12.6-RL7 can operate with VCC as low as 2.7 V while regulating a 12.6 V battery stack. Its internal voltage divider scales the 12.6 V input down to 2.000 V at the GM2 amplifier input, keeping it well within the IC's input voltage limits. This enables architectures where a low-voltage auxiliary rail powers the controller independently of the battery bus.

How does ADP3810AR-12.6-RL7 interface with an optocoupler in isolated flyback designs?

The ADP3810AR-12.6-RL7 drives optocouplers directly via its OUT pin, which sources or sinks 4–6 mA. In standard configurations, the OUT pin connects to the anode of the optocoupler LED, with cathode tied to GND - eliminating the need for an external transistor buffer. This simplifies layout, improves transient response, and reduces component count in certified isolated power supplies.

What is the minimum and maximum charge current supported by ADP3810AR-12.6-RL7?

With a 0.25 Ω sense resistor and standard 20 kΩ R3, ADP3810AR-12.6-RL7 supports 100 mA (at VCTRL = 0.1 V) to 1.2 A (at VCTRL = 1.2 V). Current range can be extended downward by increasing R3 or upward by decreasing Res - though Res reduction trades accuracy for efficiency, and R3 increase adds voltage drop across the sense path.

Does ADP3810AR-12.6-RL7 include built-in charge termination for Li-ion batteries?

No, ADP3810AR-12.6-RL7 does not implement charge termination algorithms such as timer cutoff or temperature-based end-of-charge detection. It strictly enforces constant-current/constant-voltage regulation up to 12.6 V. For full safety compliance, external supervision (e.g., microcontroller monitoring voltage, temperature, or elapsed time) is required to terminate charging after voltage stabilization.