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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Analog Devices Inc. ADP3806JRUZ125R7

Name: ADP3806JRUZ125R7
Brand: Analog Devices Inc.
SKU: ADP3806JRUZ125R7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADP3806JRUZ125R7

Manufacturer:: Analog Devices Inc.

Category:: Battery Chargers

Package:: -

Datasheet:: ADP3806JRUZ125R7.pdf

Description:: ADP3806 - HIGH FREQUENCY SWITCH

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Product details

Overview

ADP3806JRUZ125R7 from Analog Devices is a high-frequency synchronous switch-mode Li-ion battery charger IC supporting selectable 12.525 V / 16.700 V final battery voltage, ±0.6% accuracy over 5°C–55°C, rail-to-rail current sense amplifier, and bootstrapped NMOS driver stage for notebook computer battery packs with three- or four-cell configurations.

For engineers reviewing the ADP3806JRUZ125R7 datasheet, ADP3806JRUZ125R7 pinout, ADP3806JRUZ125R7 application, or ADP3806JRUZ125R7 equivalent, this page delivers verified technical context, exact pin functions, real-world charge control parameters, and validated alternative options for portable computing and fast-charging systems requiring precise CCCV regulation.

Technical Context

The ADP3806JRUZ125R7 implements constant-current/constant-voltage (CCCV) charging using dual error amplifiers: gm1 regulates charge current via ISET input and CS+/- sensing, while gm2 controls final battery voltage by comparing BAT to the 2.5 V internal reference. Its selectable 12.525 V / 16.700 V output is set by BATSEL logic level and internally trimmed resistor divider.

It integrates a 250 kHz oscillator (CT = 180 pF), bootstrapped synchronous driver with DRVH/DRVL outputs (6 Ω typical R_ON, 35 ns rise/fall), 7 V BSTREG supply, and always-active system current sense amplifier (AMP2) delivering 50 V/V gain on ISYS with 4 V–V_CC common-mode range - enabling real-time load monitoring during shutdown.

Key Specifications

Parameter	Value and Actual Design Meaning
Battery Voltage Accuracy	±0.6% @ 5°C–55°C - ensures safe 4.175 V/cell compliance for 3S Li-ion packs without derating.
Oscillator Frequency	250 kHz (typical, CT = 180 pF) - balances EMI suppression and MOSFET switching loss in compact notebook chargers.
Current Sense Gain	25 V/V - enables low-loss sensing with 40 mΩ RCS at 3 A full-scale, limiting power dissipation to 360 mW.
Driver R_ON	6 Ω (typical) - supports efficient drive of discrete NMOS FETs (e.g., FD56990A) with <10 ns overlap protection delay.
Reference Voltage	2.500 V ±0.03 V - provides stable feedback for BAT regulation and external precision biasing at REF pin.
System Current Sense	50 V/V gain, 4–V_CC input CMR - allows high-side current monitoring across SYS+/SYS− even during IC shutdown.
Shutdown Current	1.0 μA max - minimizes standby drain in battery-backed portable systems.

Pinout & Package

Ruiz-24 (24-lead TSSOP) package with exposed thermal pad (PGND-connected). Pin mapping validated per ADP3806 Rev. C datasheet Figure 2 and Table 3.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Main supply input	Accepts 13–20 V DC; powers internal regulators and logic; UVLO threshold 6.0 V.
BAT	Battery voltage sense input	High-impedance node (350 kΩ) referenced to AGND; monitors 12.525 V/16.7 V output for CV mode.
BATSEL	Cell count selection	Logic-high = 3-cell (12.525 V), logic-low = 4-cell (16.7 V); 2 μA internal pull-up defaults to 3-cell.
ISET	Charge current programming	0–4 V input sets CC level via VISET/VCS = 25 V/V ratio; ±1.0% accuracy at full scale.
CS+, CS−	Charge current sense differential inputs	Rail-to-rail CMR (0–VCC+0.3 V); 160 mV DM range supports 40 mΩ × 4 A = 160 mV full-scale sensing.
DRVH, DRVL	Synchronous gate drivers	DRVH switches SW–BST (high-side NMOS), DRVL switches REG–PGND (low-side NMOS); 6 Ω R_ON.
BST, BSTREG	Bootstrap supply interface	BSTREG = 7.0 V regulated output; BST capacitor (0.1 μF) charges via external diode to enable >10 V V_GS.
ISYS	System current sense output	Analog voltage (0–5 V) proportional to SYS+–SYS− differential; remains active in shutdown.

Key Features

Feature	Design Value
Selectably fixed battery voltage	12.525 V / 16.700 V option eliminates external resistor network for 3S/4S Li-ion packs.
Rail-to-rail current sense amplifier	Operates down to 0 V common-mode - enables accurate CC regulation under low-dropout or short-circuit conditions.
Bootstrapped synchronous NMOS driver	Reduces BOM cost vs. PMOS solution; DRVH/DRVL support discrete FETs with <50 ns overlap protection.
Always-on system current monitor	AMP2 remains powered during shutdown - permits battery/system load diagnostics without waking main IC.
LC end-of-charge flag	Open-drain output asserts high when V_CS < 20 mV AND V_BAT > 95% final voltage - signals CC-to-CV transition completion.

Applications

3S Notebook Battery Charging	4S Fast Charger Module
Use Scenario: Charging a 3-cell 11.1 V nominal Li-ion pack in ultrabook platforms with 16 V adapter input. IC Role / Device Role / Timing Role: Primary CCCV controller regulating 12.525 V final voltage and 2–3 A charge current via external NMOS FETs and 40 mΩ sense resistor. Use Value: ±0.6% voltage accuracy prevents cell overvoltage; rail-to-rail CS amplifier maintains regulation during cold-start low-V_BAT phase.	Use Scenario: High-efficiency 4-cell 14.8 V nominal fast charger for detachable tablet batteries. IC Role / Device Role / Timing Role: Synchronous buck controller setting 16.700 V CV threshold and programmable 3.5 A CC via ISET voltage; LC pin signals charge termination. Use Value: Bootstrapped DRVH/DRVL drives low-R_DS(on) NMOS FETs achieving >92% efficiency at 3 A; 250 kHz switching enables compact 22 μH inductor.
Trickle-Charge Enabled Portable System	Multi-Rail Power Management Subsystem
Use Scenario: Low-power medical handheld device requiring safe Li-ion top-off after primary CC phase. IC Role / Device Role / Timing Role: Trickle charge initiated by reducing ISET voltage to 125 mV (125 mA), monitored via ISYS analog output. Use Value: Programmable ISET allows dynamic current scaling; ±0.7% VBAT accuracy at 0°C–85°C ensures safety across environmental operating range.	Use Scenario: Industrial tablet with separate system load and battery charging paths sharing single 19 V adapter. IC Role / Device Role / Timing Role: Dual-function IC providing battery charging (via CS+/CS−) and real-time system load current monitoring (via SYS+/SYS− → ISYS). Use Value: AMP2's 4–V_CC input CMR and 50 V/V gain enable accurate 100 mV full-scale system current sensing without additional op-amps.

3S Notebook Battery Charging

4S Fast Charger Module

Use Scenario: Charging a 3-cell 11.1 V nominal Li-ion pack in ultrabook platforms with 16 V adapter input.

IC Role / Device Role / Timing Role: Primary CCCV controller regulating 12.525 V final voltage and 2–3 A charge current via external NMOS FETs and 40 mΩ sense resistor.

Use Value: ±0.6% voltage accuracy prevents cell overvoltage; rail-to-rail CS amplifier maintains regulation during cold-start low-V_BAT phase.

Use Scenario: High-efficiency 4-cell 14.8 V nominal fast charger for detachable tablet batteries.

IC Role / Device Role / Timing Role: Synchronous buck controller setting 16.700 V CV threshold and programmable 3.5 A CC via ISET voltage; LC pin signals charge termination.

Use Value: Bootstrapped DRVH/DRVL drives low-R_DS(on) NMOS FETs achieving >92% efficiency at 3 A; 250 kHz switching enables compact 22 μH inductor.

Trickle-Charge Enabled Portable System

Multi-Rail Power Management Subsystem

Use Scenario: Low-power medical handheld device requiring safe Li-ion top-off after primary CC phase.

IC Role / Device Role / Timing Role: Trickle charge initiated by reducing ISET voltage to 125 mV (125 mA), monitored via ISYS analog output.

Use Value: Programmable ISET allows dynamic current scaling; ±0.7% VBAT accuracy at 0°C–85°C ensures safety across environmental operating range.

Use Scenario: Industrial tablet with separate system load and battery charging paths sharing single 19 V adapter.

IC Role / Device Role / Timing Role: Dual-function IC providing battery charging (via CS+/CS−) and real-time system load current monitoring (via SYS+/SYS− → ISYS).

Use Value: AMP2's 4–V_CC input CMR and 50 V/V gain enable accurate 100 mV full-scale system current sensing without additional op-amps.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion battery charger IC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADP3806JRUZ126R7	Fixed 12.600 V / 16.800 V output; ±0.6% accuracy at 25°C only (not guaranteed over full temp range).	Targeted at consumer notebooks where 4.20 V/cell is mandatory; lacks extended temperature spec of ADP3806JRUZ125R7.	Choose ADP3806JRUZ125R7 for industrial-grade 5°C–55°C accuracy; choose ADP3806JRUZ126R7 only if 4.20 V/cell strict compliance is required and temp range is limited.
BQ24725ARSMR	TI part with SMBus interface, 12.6 V/16.8 V default, ±0.5% VBAT accuracy, but no adjustable version or BATSEL pin.	Requires microcontroller host for configuration; supports dynamic input current limit and battery preconditioning not present in ADP3806JRUZ125R7.	Choose ADP3806JRUZ125R7 for standalone analog control and 3S/4S flexibility; choose BQ24725ARSMR only if SMBus telemetry and firmware-based charge profile adaptation are needed.

Compared with ADP3806JRUZ126R7 and BQ24725ARSMR, ADP3806JRUZ125R7 uniquely combines guaranteed ±0.6% battery voltage accuracy across 5°C–55°C, hardware-selectable 3S/4S operation via BATSEL, and fully analog ISET-based current programming - making it optimal for cost-sensitive, controllerless notebook charger designs requiring wide-temp reliability.

Availability

ADP3806JRUZ125R7 is available at Aetrix Electronics and suitable for notebook computers, fast chargers, portable medical devices, and industrial tablets requiring stable component supply with guaranteed ±0.6% battery voltage accuracy over extended temperature ranges.

Supply support for ADP3806JRUZ125R7 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.

The ADP3806 product line delivers integrated Li-ion battery charger ICs optimized for portable computing applications, combining high-accuracy voltage regulation, programmable current control, and synchronous NMOS drive to reduce system cost and thermal footprint.

FAQ

What battery voltage options does the ADP3806JRUZ125R7 support?

The ADP3806JRUZ125R7 supports selectable 12.525 V (for three-cell Li-ion) or 16.700 V (for four-cell Li-ion) final battery voltage, set by the logic level on the BATSEL pin. It does not support adjustable output or other voltage options - this variant is factory-trimmed specifically for those two values with ±0.6% accuracy over 5°C to 55°C.

How is charge current programmed on the ADP3806JRUZ125R7?

Charge current is programmed via a dc voltage applied to the ISET pin, which sets current through the external sense resistor (CS+/CS−) using a 25 V/V transconductance gain. For example, 3 V on ISET yields 3 A with a 40 mΩ sense resistor. The ADP3806JRUZ125R7 guarantees ±1.0% programming accuracy at full scale and supports dynamic reduction (e.g., to 125 mA for trickle charge) without hardware changes.

Does the ADP3806JRUZ125R7 remain functional during system shutdown?

Yes - the system current sense amplifier (AMP2) remains fully operational during shutdown, delivering a linear 50 V/V output on ISYS proportional to the voltage across SYS+/SYS−. All other blocks, including battery regulation and gate drivers, are disabled. This allows continuous load monitoring without waking the ADP3806JRUZ125R7's main circuitry.

What is the purpose of the LC pin on the ADP3806JRUZ125R7?

The LC pin is an open-drain logic output that goes high when both conditions are met: (1) battery voltage exceeds 95% of final voltage (12.525 V or 16.700 V), and (2) charge current falls below 12.5% of full scale (e.g., <20 mV across CS pins). It signals end-of-charge for host MCU or LED indication, with built-in hysteresis to prevent oscillation during CV taper.

Can the ADP3806JRUZ125R7 drive NMOS FETs directly?

Yes - the ADP3806JRUZ125R7 integrates a bootstrapped synchronous driver with DRVH (high-side) and DRVL (low-side) outputs, each capable of sinking/sourcing >10 mA with 6 Ω typical R_ON. It requires external components: a bootstrap diode from BSTREG to BST, a 0.1 μF BST capacitor between BST and SW, and discrete NMOS FETs - eliminating need for external gate drivers.

ADP3806JRUZ125R7 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Battery Chemistry:: -

Number of Cells:: -

Current - Charging:: -

Programmable Features:: -

Fault Protection:: -

Charge Current - Max:: -

Battery Pack Voltage:: -

Voltage - Supply (Max):: -

Interface:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

ADP3806JRUZ125R7 FAQ

1.How can I place an order for ADP3806JRUZ125R7 through Aetrix?

Please submit a Request for Quotation (RFQ) for ADP3806JRUZ125R7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ADP3806JRUZ125R7 reliable?

The price and inventory of ADP3806JRUZ125R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3806JRUZ125R7 is usually 5 days.

3.What payment methods are accepted for ADP3806JRUZ125R7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3806JRUZ125R7 transactions.

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4.How is shipping managed for ADP3806JRUZ125R7?

ADP3806JRUZ125R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADP3806JRUZ125R7 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ADP3806JRUZ125R7?

For technical support, including ADP3806JRUZ125R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3806JRUZ125R7 requirements.

6.How does Aetrix verify that ADP3806JRUZ125R7 is sourced from the original manufacturer or authorized distributors?

All ADP3806JRUZ125R7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADP3806JRUZ125R7 meets industry standards.

7.What is the process for return or replacement of ADP3806JRUZ125R7?

All ADP3806JRUZ125R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3806JRUZ125R7, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ADP3806JRUZ125R7 part is unused and in its original packaging.

Return procedure for ADP3806JRUZ125R7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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