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Analog Devices Inc. ADP3806JRU-REEL7
- Part No.:
- ADP3806JRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- -
- Datasheet:
-
ADP3806JRU-REEL7.pdf
- Description:
- IC CHARGER LI-ION ADJ 24TSSOP
- Quantity:
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Inventory:196
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Product details
Overview
ADP3806JRU-REEL7 from Analog Devices is a high-frequency switch-mode Li-ion battery charger IC supporting adjustable final battery voltage (via external resistor divider), programmable charge current (0–3 A typical), ±0.5% VBAT accuracy at 25°C, and bootstrapped synchronous NMOS drive for buck topology. It targets notebook computer battery packs requiring precise CCCV charging with system current monitoring.
For engineers reviewing the ADP3806JRU-REEL7 datasheet, ADP3806JRU-REEL7 pinout, ADP3806JRU-REEL7 application, or ADP3806JRU-REEL7 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated TSSOP-24 pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all grounded in Analog Devices' Rev. B datasheet and functional block diagram.
Technical Context
The ADP3806JRU-REEL7 implements constant-current/constant-voltage (CCCV) charging using dual amplifiers: gm1 regulates charge current via ISET-programmed feedback, while gm2 controls final battery voltage by comparing BAT to the 2.5 V internal reference. Its oscillator sets switching frequency (210–290 kHz with 180 pF CT) and supports SYNC input for frequency alignment.
It integrates a bootstrapped synchronous driver (DRVH/DRVL) enabling two external NMOS FETs, a 7.0 V BSTREG supply for high-side gate drive, a 6.0 V analog regulator (REG), and a dedicated system current sense amplifier (SYS+/SYS– → ISYS) that remains active during shutdown - all within a single TSSOP-24 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Voltage Accuracy | ±0.5% @ 25°C; ensures safe 4.2 V/cell compliance for 3S/4S Li-ion packs without overvoltage risk. |
| Charge Current Programming | 0–4 V on ISET pin → 0–3 A range (e.g., 3 V → 3 A with 40 mΩ sense resistor); enables dynamic current scaling including trickle mode. |
| Oscillator Frequency | 210–290 kHz (typ. 250 kHz with 180 pF CT); balances efficiency, EMI, and inductor size for portable computing power stages. |
| System Current Sense | 50 V/V gain, 4–16.3 V common-mode range, active in shutdown; allows real-time load current monitoring independent of charging state. |
| Driver On Resistance | 6 Ω (typ.) for DRVH/DRVL; minimizes conduction loss in external NMOS switches at high charge currents. |
| UVLO Threshold | 6.0 V turn-on with 0.3 V hysteresis; prevents erratic startup during unstable adapter input conditions. |
| Reference Voltage | 2.500 V ±0.03 V (REF pin); provides precision voltage source for external circuitry or calibration. |
Pinout & Package
TSSOP-24 (RU-24) package: 4.4 mm × 7.8 mm, 0.65 mm pitch, exposed thermal pad (PGND-connected). Pin 19 (PGND) and pin 13 (AGND) require separate low-impedance ground paths for optimal noise immunity and sensing accuracy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Main power supply input | Accepts 13–20 V DC; powers internal regulators and logic; UVLO activates at 6.0 V. |
| BAT (Pin 14) | Battery voltage sense input | High-impedance node referenced to AGND; connects to battery positive via precision resistor divider for adjustable voltage setting. |
| ISET (Pin 16) | Charge current programming input | 0–4 V analog control; sets full-scale charge current linearly (e.g., 1 V = 1 A with 40 mΩ RCS). |
| CS+ / CS– (Pins 18/17) | Current sense differential inputs | Rail-to-rail inputs (0–VCC + 0.3 V); measure voltage drop across external sense resistor for CC regulation. |
| DRVH / DRVL (Pins 23/20) | Synchronous NMOS gate drivers | DRVH drives high-side NMOS (SW–BST path); DRVL drives low-side NMOS (SW–PGND path); overlap protection prevents shoot-through. |
| BSTREG (Pin 21) | 7.0 V bootstrap regulator output | Supplies gate drive for DRVH; requires 0.1 µF ceramic decoupling to PGND near IC; not intended for external loads. |
| ISYS (Pin 4) | System current sense output | Analog voltage (0–5 V) proportional to SYS+–SYS– differential; remains active in shutdown for continuous load monitoring. |
| LC (Pin 12) | Low-current charge termination flag | Open-drain output pulled high externally; asserts when charge current falls below 12.5% of full scale AND VBAT > 95% of target. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable battery voltage setting | Configured via external resistor divider on BAT/BATSEL pins; supports custom pack voltages beyond 12.6 V/16.8 V fixed options. |
| Rail-to-rail current sense amplifier | Enables accurate CC regulation even under low dropout (e.g., VBAT ≈ VIN) or short-circuit fault conditions. |
| Bootstrapped synchronous NMOS drive | Eliminates need for PMOS or isolated gate drivers; reduces BOM cost and improves efficiency vs. discrete solutions. |
| Active system current monitoring in shutdown | Allows host MCU to monitor system load current continuously without waking charger IC - critical for battery-powered standby modes. |
| Integrated overvoltage/overcurrent comparators | Fast-acting (2 ms response) protection circuits feed-forward to COMP pin to clamp output during faults - no software dependency. |
Applications
| Notebook Computer Battery Charging | Fast-Charging Docking Station |
|---|---|
|
Use Scenario: Charging 3S/4S Li-ion battery packs in ultrabooks with AC adapter input up to 20 V. IC Role / Device Role / Timing Role: Primary CCCV charger controller managing buck converter, current/voltage loops, and termination signaling. Use Value: ±0.5% VBAT accuracy ensures cell-level safety compliance; LC output provides hardware-based end-of-charge signal to system PMIC. |
Use Scenario: Multi-port USB-C PD docking station delivering up to 3 A charge current to attached laptops. IC Role / Device Role / Timing Role: High-efficiency secondary-side charger IC handling variable input (9–20 V) and dynamically adjusting charge profile per device negotiation. Use Value: Programmable ISET enables firmware-controlled current ramping; system current sense (ISYS) feeds back total dock load to upstream PD controller. |
| Industrial Portable Test Equipment | Medical Handheld Diagnostic Device |
|
Use Scenario: Rechargeable Li-ion powered multimeter or oscilloscope with embedded charger and runtime monitoring. IC Role / Device Role / Timing Role: Integrated charger + system monitor providing both battery management and real-time load telemetry. Use Value: Dual-sense capability (CS for charge, SYS for system) enables accurate battery fuel gauging and remaining runtime estimation. |
Use Scenario: FDA-classified handheld ultrasound or glucose meter requiring fail-safe charging and low-power standby operation. IC Role / Device Role / Timing Role: Safety-certifiable charger IC with shutdown-isolated sensing and precision voltage reference for ADC calibration. Use Value: REF pin's 2.500 V ±0.03 V output serves as stable ADC reference; shutdown retention of ISYS supports always-on patient monitoring during charge. |
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 |
|---|---|---|---|
| BQ24725ARHBT | Fixed 12.6 V/16.8 V only; no adjustable option; integrated MOSFETs (no external FET drive); 500 kHz max switching frequency. | Targets space-constrained designs where external FETs are undesirable; lacks system current sense channel. | Select BQ24725ARHBT when board area is critical and adjustable voltage or system current monitoring is unnecessary. |
| MP2672GQ-Z | Supports adjustable voltage (via resistor divider) and ISET programming; 1.2 MHz switching; no BSTREG or dedicated system current sense amplifier. | Optimized for higher-frequency, smaller-inductor designs; missing ISYS functionality limits system-level load visibility. | Select MP2672GQ-Z when higher switching frequency is required and system current telemetry is handled elsewhere. |
Compared with BQ24725ARHBT and MP2672GQ-Z, the ADP3806JRU-REEL7 uniquely combines adjustable battery voltage, external synchronous NMOS drive, and always-active system current sensing - making it optimal for designs requiring flexibility, efficiency, and comprehensive power telemetry.
Availability
ADP3806JRU-REEL7 is available at Aetrix Electronics and suitable for notebook computer battery charging, fast-charging docking stations, and industrial portable test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADP3806JRU-REEL7 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 communications markets since 1965.
The ADP3806 belongs to Analog Devices' high-accuracy battery management IC product line, designed specifically for demanding Li-ion CCCV charging applications in portable computing and industrial equipment where voltage precision, current programmability, and system-level power visibility are critical.
FAQ
What battery voltage options does the ADP3806JRU-REEL7 support?
The ADP3806JRU-REEL7 supports fully adjustable battery voltage via external resistor divider on BAT/BATSEL pins - unlike fixed-voltage variants (e.g., ADP3806JRU-12.6-R7). It achieves ±0.5% accuracy at 25°C and ±0.7% over 0°C–85°C, enabling custom 3S/4S Li-ion pack configurations beyond standard 12.6 V/16.8 V.
How is charge current programmed on the ADP3806JRU-REEL7?
Charge current on the ADP3806JRU-REEL7 is set by applying 0–4 V to the ISET pin, which scales linearly with sensed current through the external RCS resistor. For example, 3 V on ISET yields ~3 A with a 40 mΩ sense resistor. Accuracy is ±1.0% at VISET = 4.0 V and degrades to ±30% at lower voltages - confirming its use for coarse current setting and trickle mode.
Does the ADP3806JRU-REEL7 support system current monitoring during shutdown?
Yes - the ADP3806JRU-REEL7's system current sense amplifier (SYS+/SYS– → ISYS) remains fully operational during shutdown, delivering a 0–5 V analog output proportional to load current. This enables continuous runtime monitoring without waking the main charger, a feature absent in most competing charger ICs like BQ24725ARHBT.
What is the purpose of the LC pin on the ADP3806JRU-REEL7?
The LC pin on the ADP3806JRU-REEL7 is an open-drain logic output that signals end-of-charge: it pulls high when both battery voltage exceeds 95% of target AND charge current falls below 12.5% of full scale (e.g., <20 mV across CS pins). This hardware-based flag eliminates reliance on microcontroller polling for charge termination.
Can the ADP3806JRU-REEL7 drive external NMOS transistors without additional level-shifting circuitry?
Yes - the ADP3806JRU-REEL7 integrates a bootstrapped synchronous driver (DRVH/DRVL) with internal BSTREG (7.0 V) and overlap protection, enabling direct gate drive of two external NMOS FETs in buck topology. No external level shifters or isolated supplies are needed, reducing BOM count and layout complexity versus discrete driver solutions.
ADP3806JRU-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- -
ADP3806JRU-REEL7 FAQ
1.How can I place an order for ADP3806JRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3806JRU-REEL7 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 ADP3806JRU-REEL7 reliable?
The price and inventory of ADP3806JRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3806JRU-REEL7 is usually 5 days.
3.What payment methods are accepted for ADP3806JRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3806JRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3806JRU-REEL7?
ADP3806JRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3806JRU-REEL7 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 ADP3806JRU-REEL7?
For technical support, including ADP3806JRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3806JRU-REEL7 requirements.
6.How does Aetrix verify that ADP3806JRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADP3806JRU-REEL7 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 ADP3806JRU-REEL7 meets industry standards.
7.What is the process for return or replacement of ADP3806JRU-REEL7?
All ADP3806JRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3806JRU-REEL7, 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 ADP3806JRU-REEL7 part is unused and in its original packaging.
Return procedure for ADP3806JRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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