Analog Devices Inc. ADP3820ARTZ-4.2RL7

Overview

ADP3820ARTZ-4.2RL7 from Analog Devices is a precision single-cell Li-ion battery charge controller IC designed to drive an external P-channel MOSFET in linear charging topologies. It delivers ±1% output voltage accuracy, 630 mA typical quiescent current in normal mode, and 1 µA shutdown current. Its 4.5 V to 15 V input range, integrated gate-to-source clamp (6 V), and reverse leakage protection enable compact, low-cost chargers for portable electronics.

For engineers reviewing the ADP3820ARTZ-4.2RL7 datasheet, ADP3820ARTZ-4.2RL7 pinout, ADP3820ARTZ-4.2RL7 application, or ADP3820ARTZ-4.2RL7 equivalent, this device supports programmable charge current via external sense resistor, foldback current limiting, and stable operation with ≥10 µF output capacitance - critical for handheld instrument and cellular phone charger designs requiring tight voltage regulation and thermal safety.

Technical Context

The ADP3820ARTZ-4.2RL7 implements a high-gain (80 dB) error amplifier to regulate output voltage at 4.2 V with ±1% accuracy across –20°C to +85°C. It senses output voltage at the VOUT pin and current via the IS pin, enabling precise control of external PMOS gate drive through the GATE pin.

Its proprietary shutdown logic accepts TTL-compatible SD input (VIH = 2.0 V, VIL = 0.4 V), reducing ground current to 1 µA when disabled. The internal 6 V gate-to-source clamp protects the external MOSFET during overvoltage transients, while foldback current limiting activates below ~2.5 V output to limit power dissipation during short-circuit or deeply discharged battery conditions.

Key Specifications

Pinout & Package

ADP3820ARTZ-4.2RL7 is packaged in a 6-lead SOT-23-6 surface-mount package (RT-6), with pin 1 marked by a dot. Thermal resistance θJA is 230°C/W, requiring careful PCB layout with thermal vias for >500 mA applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion charge controller applications.

Compared with TPS65023BRSBT and MAX1555, ADP3820ARTZ-4.2RL7 provides minimal-component, thermally optimized linear charging with external MOSFET selection freedom - ideal when cost, layout simplicity, and thermal headroom outweigh integration needs.

Availability

ADP3820ARTZ-4.2RL7 is available at Aetrix Electronics and suitable for cellular telephones, hand-held instruments, and desktop computer backup battery systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADP3820ARTZ-4.2RL7 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, headquartered in Norwood, MA.

The ADP3820 product line delivers precision linear battery charge controllers for single-cell Li-ion systems, emphasizing accuracy, low quiescent current, and robust protection features in minimal-footprint packages.

FAQ

What is the output voltage setting of the ADP3820ARTZ-4.2RL7?

The ADP3820ARTZ-4.2RL7 is factory-trimmed to deliver a precise 4.2 V output voltage with ±1% accuracy across temperature and load. This fixed setting targets graphite-anode Li-ion cells and cannot be adjusted externally - it is distinct from the ADP3820ART-4.1 variant, which outputs 4.1 V for coke-anode cells.

How does the ADP3820ARTZ-4.2RL7 implement reverse leakage protection?

The ADP3820ARTZ-4.2RL7 integrates proprietary circuitry that reduces output-to-input reverse current to ≤5 µA when VIN is disconnected or floating. This eliminates the need for an external series blocking diode, saving board space and forward-voltage drop - a key advantage over discrete controller + diode solutions.

Can the ADP3820ARTZ-4.2RL7 drive any P-channel MOSFET?

The ADP3820ARTZ-4.2RL7 drives P-channel MOSFETs via its GATE pin with up to 1 mA sink/source capability and a hard 6 V gate-to-source clamp. To ensure full enhancement, select a PMOS with VGS(th) ≤ 4.25 V at worst-case temperature and VIN = 5 V - verified using the formula VGS = VIN – 0.7 V – ICHG × RS.

What is the minimum output capacitance required for stability with the ADP3820ARTZ-4.2RL7?

The ADP3820ARTZ-4.2RL7 is stable with any capacitor type (tantalum, aluminum, ceramic) ≥10 µF at the VOUT pin - no minimum ESR requirement. This "anyCAP" capability simplifies design and avoids costly low-ESR capacitors, unlike many older linear controllers that demand specific ESR ranges.

Does the ADP3820ARTZ-4.2RL7 support programmable charge current?

Yes - charge current is set by an external sense resistor (RS) between VIN and IS pins. With a typical current-limit threshold of 50 mV, RS = 50 mV / ICHG (e.g., 100 mΩ for 500 mA). The ADP3820ARTZ-4.2RL7 monitors this voltage drop to regulate and foldback current during fault conditions.