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Monolithic Power Systems Inc. MP2681BGS-P
- Part No.:
- MP2681BGS-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Battery Chargers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2681BGS-P.pdf
- Description:
- CC/CV CONTROLLER WITH FULL PROTE
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
MP2681BGS-P from Monolithic Power Systems is a highly integrated Li-ion/Li-polymer switch-mode battery charge controller for power tools, featuring automatic 3S/4S/5S battery-cell detection via ID resistor, precision CC/CV regulation (4.158 V/cell typ), full protection (NTC monitoring, timer fault, ID validation), and dual LED status indication. It operates from 5.0 V to 30 V input and delivers up to 4 A charge current in fast-charge mode.
For engineers reviewing the MP2681BGS-P datasheet, MP2681BGS-P pinout, MP2681BGS-P application, or MP2681BGS-P equivalent, this device supports AC adapter and cradle charger designs requiring cell-configuration auto-detection, pre-charge for deeply discharged batteries (≤3.0 V/cell), programmable charge termination (10% ICC), thermal safety with NTC window control, and fault-driven CCON gate cutoff.
Technical Context
The MP2681BGS-P implements a dual-loop CC/CV control architecture using internal op-amps (1 MHz bandwidth) with COMP output driving an optocoupler for flyback primary-side regulation. Battery voltage is sensed at BATT and regulated against a 2.075 V internal reference via VFB feedback.
It integrates autonomous battery identification through VID voltage thresholds (0.3–2.65 V) mapped to 3S/4S/5S configurations, enabling dynamic adjustment of charge voltage (12.44 V / 16.59 V / 20.74 V), pre-charge current (150 mA fixed), and total charge time (2 hr fast / 8 hr slow).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.0 V to 30 V - supports universal AC adapters and industrial cradle chargers without external LDO. |
| Battery Regulation Voltage | 4.158 V/cell (typ) - precise CV threshold for Li-ion cells, ±0.025 V tolerance ensures safe full-charge termination. |
| Pre-Charge Threshold | 3.0 V/cell (typ) - triggers fixed 150 mA constant-current pre-charge for batteries below safe CC entry voltage. |
| Charge Termination Current | 10% of programmed ICC (fast mode) - enables reliable end-of-charge detection without external comparator circuitry. |
| NTC Voltage Window | 23–98% of VLDO (5 V) - maps to -20°C to +50°C temperature range, enabling cell-safe charging with automatic current derating. |
| Timer Frequency | 15 Hz (with 0.1 µF TMR capacitor) - sets pre-charge timeout (60 min) and total charge limit (2 hr fast / 8 hr slow). |
| LDO Output | 5.0 V ±0.2 V @ 20 mA - powers NTC/ID/FLT pull-ups, eliminating need for external bias supply. |
Pinout & Package
MP2681BGS-P is housed in a 16-pin SOIC package with exposed pad for thermal dissipation (θJA = 80°C/W, θJC = 35°C/W). Pin 2 is NC; all other pins have defined electrical roles per functional block diagram and absolute maximum ratings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Power Supply Input | Bypassed with ≥4.7 µF capacitor; powers internal circuits and LDO; UVLO triggers at 4.5 V. |
| 3 GND | Ground Reference | Common return for analog and power sections; requires low-impedance PCB plane connection. |
| 4 VFB | Voltage Feedback Input | Connects to optocoupler cathode; compares sensed battery voltage to 2.075 V reference for CV regulation. |
| 5 COMP | Compensation Output | Drives optocoupler LED; combines voltage and current loop outputs for stable flyback control. |
| 6 IFB | Current Feedback Input | Monitors voltage across external sense resistor to regulate charge current in CC mode. |
| 7 LEDR / 8 LEDG | Status Indicator Outputs | Drive bi-color LED to signal charge state, faults (NTC/timer/ID), and battery presence via logic-level sink/source. |
| 9 CR | Charge Rate Control | Logic high = fast charge (VIREF = 0.16 V); logic low = slow charge (VIREF = 0.016 V); floating = default fast. |
| 10 ID | Battery ID Detection | Reads VID voltage from battery-pack resistor divider to auto-select 3S/4S/5S configuration and charge voltage. |
| 11 NTC | Temperature Sense Input | Measures NTC thermistor voltage divider output to enforce charging only within safe thermal window (-20°C to +50°C). |
| 12 TMR | Timer Capacitor Connection | Connects to GND via capacitor (e.g., 0.1 µF) to set oscillator frequency and charge timing limits. |
| 13 LDO | Internal 5 V Regulator Output | Supplies bias to NTC, ID, and FLT circuits; delivers up to 20 mA with <0.5 µA leakage. |
| 14 FLT | Fault Open-Drain Output | Pulled low during any fault (NTC out-of-range, timer timeout, ID short/open); signals host system or drives LED. |
| 15 BATT | Battery Voltage Sense | Direct connection to battery pack positive terminal; enables dead-battery detection (<1.0 V/cell) and pre-charge enable. |
| 16 CCON | Charge Path MOSFET Gate Driver | Pulled low during normal charge; pulled high to cut off external high-side MOSFET during fault or termination. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-Detect Battery Configuration | Identifies 3S/4S/5S packs via ID resistor voltage (0.3–2.65 V), eliminating manual configuration jumpers. |
| Integrated Dual Op-Amps | Two 1 MHz bandwidth amplifiers with OR-combined output drive optocoupler directly for stable CC/CV loop response. |
| Programmable Charge Rate | CR pin selects fast (0.16 V reference) or slow (0.016 V reference) current mode without changing sense resistor. |
| Smart NTC Protection | Four-voltage-window detection (23–98% VLDO) enables automatic current scaling (ICHG → ICHG/4 → 0) across -20°C to +50°C. |
| Full Fault Signaling | Dedicated open-drain FLT output and dual LED drivers (LEDR/LEDG) provide visual and electrical fault reporting for 7 distinct conditions. |
Applications
| Power Tool Battery Charger | Stand-Alone Fast Charger |
|---|---|
|
Use Scenario: Cordless drill/driver battery packs with 3S–5S Li-ion configurations requiring rapid, safe recharging between shifts. IC Role / Device Role / Timing Role: Primary CC/CV controller managing flyback converter output, battery voltage/current regulation, and cell-configuration auto-detection. Use Value: Eliminates manual battery-type selection; reduces BOM count by integrating op-amps, LDO, and LED drivers; enables field-replaceable battery packs with ID resistor encoding. |
Use Scenario: Wall-mounted or benchtop fast chargers for professional-grade power tool batteries with thermal and timer-based safety enforcement. IC Role / Device Role / Timing Role: System-level charge manager coordinating pre-charge, CC ramp, CV hold, auto-recharge (3.95 V/cell), and fault shutdown. Use Value: Guarantees ≤2 hr full charge for 4 A systems; prevents overcharge via dual-tier timer (60 min pre-charge + 2 hr total); provides unambiguous LED status for user-facing diagnostics. |
| AC Adapter-Based Charging | Cradle Charger Interface |
|
Use Scenario: Universal AC-to-DC adapters powering multiple battery chemistries and configurations in shared infrastructure environments. IC Role / Device Role / Timing Role: Adaptive voltage regulator that adjusts output (12.44 V / 16.59 V / 20.74 V) based on detected battery ID, not fixed adapter rating. Use Value: Enables single adapter SKU to serve 3S/4S/5S tools; avoids overvoltage damage from mismatched adapters; supports legacy and next-gen packs without hardware change. |
Use Scenario: Docking station cradles for cordless vacuums, lawn mowers, or robotic platforms requiring hot-swap battery insertion detection and thermal management. IC Role / Device Role / Timing Role: Battery interface IC performing ID validation, NTC monitoring, and CCON-controlled MOSFET gate switching upon pack insertion/removal. Use Value: Detects missing or invalid battery (ID open/short/floating) before enabling charge; halts charging if NTC reads outside -20°C to +50°C; provides immediate visual feedback via LEDR/LEDG. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24618RTWR | Requires external op-amps and discrete NTC interface; no integrated LDO or auto-ID detection; 16-pin QFN only. | Best suited for cost-sensitive, fixed-configuration (4S only) chargers where board space allows added components. | Select when design already uses TI ecosystem and requires adjustable termination current threshold (not fixed %ICC). |
| ISL9238HRTZ | Supports USB PD input but lacks ID-resistor auto-detection; uses I²C interface instead of analog VID; 24-pin QFN package. | Ideal for portable electronics with firmware-controlled charging profiles, not plug-and-play power tool cradles. | Choose when system-level microcontroller is present and programmable charge sequencing (e.g., stepwise CV ramps) is required. |
Compared with BQ24618RTWR and ISL9238HRTZ, MP2681BGS-P uniquely integrates battery ID decoding, dual op-amps, 5 V LDO, and LED drivers in a single SOIC-16 package-reducing component count by ≥7 parts and eliminating firmware dependency for 3S/4S/5S tool battery compatibility.
Availability
MP2681BGS-P is available at Aetrix Electronics and suitable for power tool battery chargers, stand-alone fast chargers, AC adapter-based charging systems, and cradle charger interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2681BGS-P 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
Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with core expertise in DC/DC conversion, battery management, and motor control solutions.
The MP2681B product line targets high-reliability, high-power portable tool charging systems, delivering integrated CC/CV control, multi-cell auto-detection, and comprehensive fault protection in minimal footprint.
FAQ
What battery configurations does MP2681BGS-P support?
MP2681BGS-P supports automatic detection and regulation for 3S (12.44 V), 4S (16.59 V), and 5S (20.74 V) Li-ion or Li-polymer battery packs via dedicated ID resistor voltage thresholds (0.3–2.65 V). It does not support 1S, 2S, or 6S+ configurations, nor non-Li chemistries like NiMH or lead-acid.
How does the MP2681BGS-P handle deeply discharged batteries?
When VBATT falls below 3.0 V/cell, MP2681BGS-P enters fixed 150 mA pre-charge mode with output voltage clamped to 3.2 V/cell. This continues until VBATT exceeds 3.0 V/cell or the 60-minute pre-charge timer expires, preventing lithium plating and ensuring safe recovery of depleted cells.
Can the charge termination current be adjusted independently of charge rate?
No-the termination current is fixed at 10% of the programmed fast-charge current (ICC) or 30% of slow-charge current, determined solely by CR pin state and sense resistor value. There is no separate register or pin to adjust IBF percentage; it is hardwired per operational mode.
What happens if the battery ID resistor is missing or out-of-range?
If ID is floating or VID is outside 0.3–2.65 V, MP2681BGS-P defaults to 3S mode (12.44 V) and asserts FLT low while flashing LEDR and holding LEDG low. If ID is shorted (<0.3 V), it enters sleep mode with 10.8 V output and disables charging entirely until power cycle.
Does MP2681BGS-P require external compensation components for stability?
Yes-external compensation network (resistor + capacitor) must be connected between COMP and GND to stabilize the voltage regulation loop. The datasheet specifies typical values (e.g., 10 kΩ + 1 nF) based on flyback transformer characteristics and optocoupler CTR; no internal compensation is provided.
Is the LDO output capable of powering external circuitry beyond NTC/ID/FLT?
The 5 V LDO delivers up to 20 mA with ±0.2 V regulation and is intended exclusively for biasing NTC, ID, and FLT circuits. Driving external loads (e.g., MCU I/O, sensors) is not recommended due to limited current capacity and lack of overcurrent protection on the LDO output.
How does the CCON pin behave during normal operation versus fault conditions?
During normal charging, CCON is actively pulled low to enable the external high-side MOSFET. Upon any fault (NTC out-of-range, timer timeout, ID error, power-line fault), CCON is immediately driven high to disconnect the charge path, isolating the battery from the power source within microseconds.
MP2681BGS-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 3 ~ 5
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer, Voltage
- Fault Protection:
- Over Current, Over Temperature, Over Voltage, Short Circuit
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 4.158V
- Voltage - Supply (Max):
- 30V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MP2681BGS-P FAQ
1.How can I place an order for MP2681BGS-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2681BGS-P 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 MP2681BGS-P reliable?
The price and inventory of MP2681BGS-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2681BGS-P is usually 5 days.
3.What payment methods are accepted for MP2681BGS-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2681BGS-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2681BGS-P?
MP2681BGS-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2681BGS-P 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 MP2681BGS-P?
For technical support, including MP2681BGS-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2681BGS-P requirements.
6.How does Aetrix verify that MP2681BGS-P is sourced from the original manufacturer or authorized distributors?
All MP2681BGS-P 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 MP2681BGS-P meets industry standards.
7.What is the process for return or replacement of MP2681BGS-P?
All MP2681BGS-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2681BGS-P, 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 MP2681BGS-P part is unused and in its original packaging.
Return procedure for MP2681BGS-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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