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Monolithic Power Systems Inc. MP2618EV-LF-P
- Part No.:
- MP2618EV-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Battery Chargers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
MP2618EV-LF-P.pdf
- Description:
- IC BATT CHG LI-ION 2-3CELL 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,244
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Product details
Overview
MP2618EV-LF-P from Monolithic Power Systems is a monolithic 2–3 cell Li-ion battery switching charger IC with integrated 0.28Ω power MOSFET, 2A programmable charge current, ±0.75% battery voltage regulation accuracy, and system power path management for netbook PCs and distributed power systems. It operates from 5.5V to 24V input, uses peak current mode control at fixed 600kHz, and supports automatic recharge at 4.0V/cell.
For engineers reviewing the MP2618EV-LF-P datasheet, MP2618EV-LF-P pinout, MP2618EV-LF-P application, or MP2618EV-LF-P equivalent, key selection criteria include power path current sharing behavior, NTC thermistor interface configuration, TMR timer capacitor programming, and dual-loop CC/CV charge regulation architecture.
Technical Context
The MP2618 employs peak current mode control with slope compensation and dual independent control loops: COMPI regulates constant-current (CC) via battery current sense amplifier A2, while COMPV regulates constant-voltage (CV) via battery voltage error amplifier GMV. The internal 600kHz oscillator drives a synchronous rectified buck topology with bootstrap gate drive (BST–SW).
Power path management is implemented through OUT1 current-sense feedback: RG1/RG2 set gain for system current sensing, and RS2 scales the sensed ISYS to modulate charge current in real time-ensuring system load priority over charging when input current is shared. Battery temperature monitoring uses an external NTC thermistor connected to NTC pin with VREF33 reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 24V - supports wide-input adapters including 12V/19V laptop supplies and industrial 24V rails. |
| Charge Current | Up to 2A programmable via RS1 - enables fast charging of 2S/3S Li-ion packs (e.g., 7.4V/11.1V) with ±5% accuracy. |
| Battery Voltage Accuracy | ±0.75% - ensures precise CV termination (e.g., 8.40V ±63mV for 2-cell, 12.60V ±94.5mV for 3-cell) to maximize cycle life. |
| Switching Frequency | Fixed 600kHz - balances EMI performance and inductor size; allows use of compact 4.7µH–10µH shielded inductors. |
| Internal MOSFET RDS(on) | 0.28Ω - reduces conduction loss and thermal stress; enables >90% efficiency at 2A with proper layout and output capacitance. |
| Power Path Management | Real-time current sharing - dynamically reduces charge current as system load increases, prioritizing VSYS supply without interrupting operation. |
| NTC Interface | Dedicated NTC pin with internal 3.3V reference and window comparator - supports standard NCP18XH103 thermistors for 0°C–50°C safe-charge envelope. |
Pinout & Package
MP2618EV-LF-P is housed in a thermally enhanced 4mm × 5mm QFN-28 package with exposed thermal pad (Pin 11/21). The package supports high-power dissipation (θJA = 40°C/W) and requires PCB copper pour under the exposed pad for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 25,26) | Switch Node Output | Drives external inductor; connects to BST capacitor for high-side gate drive; must be routed short and away from sensitive analog nodes. |
| CSP / BATT (Pins 20,19) | Battery Current Sense Input | Differential pair across RS1 (e.g., 110mΩ) for accurate ICC measurement; low-offset amplifier A2 enables ±2% current sense accuracy. |
| RG1 / RG2 (Pins 9,14) | System Current Sense Gain Resistors | Set gain for OUT1 current mirror; used with RS2 (20mΩ) to scale ISYS for power path current sharing feedback. |
| TMR (Pin 23) | Charge Timer Capacitor Terminal | 0.1µA constant current charges external capacitor; 0.1µF sets 30min trickle timeout and 3hr total charge limit. |
| NTC (Pin 2) | Thermistor Voltage Divider Input | Monitors NTC resistance between VREF33 and GND; triggers shutdown if voltage falls outside 30–73% of 3.3V (0°C–50°C window). |
| CHGOK / ACOK (Pins 4,3) | Open-Drain Status Outputs | CHGOK = LOW during active charge; ACOK = LOW when VIN > VBAT + 0.3V and above UVLO - enables simple LED or MCU status monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.28Ω Power MOSFET | Eliminates need for external high-side switch; reduces BOM count and PCB area while maintaining >90% efficiency at full load. |
| Programmable 2–3 Cell Configuration | CELLS pin float = 3-cell (12.6V), grounded = 2-cell (8.4V); enables single design to support multiple battery pack configurations. |
| Preconditioning for Dead Batteries | Trickle charge mode activates below 3V/cell (6V/9V) with 10% ICC current - safely recovers deeply discharged Li-ion cells before CC ramp-up. |
| Thermal Shutdown & Cycle-by-Cycle OCP | 150°C junction shutdown with 130°C hysteresis; per-cycle current limiting protects against short-circuit and overload faults. |
| VREF33 Output (3.3V/50mA) | Stable internal LDO powers external circuitry (e.g., MCU, fuel gauge, NTC bias network); bypassed by 1µF ceramic capacitor for stability. |
Applications
| Netbook PC Power Management | Distributed Power System Charger |
|---|---|
|
Use Scenario: Dual-role laptop platform requiring simultaneous system operation and battery charging from 19V adapter. IC Role / Device Role / Timing Role: Primary battery charger IC managing CC/CV profile, power path arbitration, and thermal safety for 2S/3S Li-ion packs. Use Value: Enables uninterrupted runtime during charge via seamless input-to-system power handoff and dynamic current sharing (e.g., 1.2A system + 0.8A charge @ 2A total input). |
Use Scenario: Industrial edge gateway with backup battery and variable system load (radio, sensor hub, MCU). IC Role / Device Role / Timing Role: Standalone switching charger with autonomous power path control and NTC-based temperature guardbanding. Use Value: Maintains stable VSYS under fluctuating loads without brownouts; prevents overtemperature charging via programmable NTC window (0°C–50°C). |
| 2-Cell Li-ion Portable Instrument | 3-Cell Medical Handheld Device |
|
Use Scenario: Battery-powered handheld test equipment requiring long runtime and field-replaceable 7.4V Li-ion packs. IC Role / Device Role / Timing Role: High-accuracy charger IC delivering ±0.75% VBATT regulation and automatic recharge at 4.0V/cell (8.0V). Use Value: Extends battery cycle life by preventing overvoltage stress; trickle preconditioning recovers cells dropped to 6.0V after storage. |
Use Scenario: FDA-class medical device with sealed 11.1V Li-ion battery requiring fail-safe charging and thermal compliance. IC Role / Device Role / Timing Role: Safety-certifiable charger implementing dual fault protection (NTC, thermal shutdown, timer) and open-drain status signaling. Use Value: Meets IEC 62368-1 requirements via hardware-enforced charge termination, redundant temperature monitoring, and CHGOK/ACOK fault reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Li-ion switching charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24725ARHBT | 4.5V–24V input, 3A max, SMBus-controlled, no integrated MOSFET - requires external high-side FET and more external components. | Lacks native power path management; relies on host MCU for current arbitration; supports multi-chemistry (Li-ion/LiFePO₄). | Choose for designs needing firmware-configurable charge profiles or multi-battery chemistry support, not for cost-optimized standalone power path. |
| ISL9238HRZ-T | 4.5V–24V input, 3.2A max, integrated 0.25Ω MOSFET, but only supports 2-cell (8.4V) fixed configuration - no CELLS pin for 3-cell selection. | No NTC interface; uses external thermistor ADC via SMBus; lacks dedicated TMR timeout function - relies on host supervision. | Choose for 2-cell-only applications where higher current (3.2A) and lower RDS(on) are critical, and NTC/timer autonomy is handled externally. |
Compared with BQ24725ARHBT and ISL9238HRZ-T, MP2618EV-LF-P delivers unique integration of power path current sharing, hardware-programmable 2/3-cell support, and autonomous NTC+timer safety - reducing system-level firmware dependency and component count in space-constrained portable designs.
Availability
MP2618EV-LF-P is available at Aetrix Electronics and suitable for netbook PC power subsystems, distributed industrial power systems, and portable medical instrumentation requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.
Supply support for MP2618EV-LF-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 MP2618 belongs to MPS's battery charger IC product line, designed specifically for high-efficiency, feature-rich Li-ion charging in space-constrained portable electronics - emphasizing integration, safety autonomy, and minimal external component count.
FAQ
What is the maximum supported battery configuration for MP2618EV-LF-P?
The MP2618EV-LF-P supports both 2-cell (7.4V nominal, 8.4V float) and 3-cell (11.1V nominal, 12.6V float) Li-ion battery packs. Configuration is selected via the CELLS pin: grounding selects 2-cell mode; leaving it floating selects 3-cell mode. The ±0.75% voltage accuracy applies to both configurations.
How does power path management allocate current between system load and battery charging?
MP2618EV-LF-P implements hardware-based current sharing: system current (ISYS) is sensed via RS2 and RG1/RG2, generating a feedback voltage at OUT1 that directly reduces charge current (IBAT) in real time. When ISYS increases, IBAT decreases proportionally until it reaches zero - ensuring VSYS remains powered first, with no software intervention required.
Can MP2618EV-LF-P charge a fully depleted battery (e.g., <3V/cell)?
Yes. The MP2618EV-LF-P includes a dedicated trickle charge mode that activates when battery voltage falls below 3V/cell (6V for 2-cell, 9V for 3-cell). It delivers 10% of the programmed CC current (e.g., 200mA for 2A setting) until VBATT rises above threshold, then transitions to constant-current mode - enabling safe recovery of deeply discharged cells.
What external components are mandatory for basic operation?
Mandatory components include: input capacitor (≥4.7µF X5R/X7R ceramic at VIN), output capacitor (≥22µF at BATT), inductor (4.7µH recommended), current sense resistor RS1 (e.g., 110mΩ for 2A), bootstrap capacitor (0.1µF between SW–BST), and TMR timing capacitor (0.1µF for 3hr total charge). VREF33 requires a 1µF bypass capacitor to GND.
Does MP2618EV-LF-P support battery temperature monitoring?
Yes. The NTC pin interfaces with a thermistor (e.g., NCP18XH103) connected between VREF33 and GND. Internal comparators monitor the NTC voltage against preset thresholds (30% and 73% of 3.3V), corresponding to ~50°C and ~0°C. Charging halts if voltage falls outside this window and resumes automatically when temperature returns to range.
What protections are built into MP2618EV-LF-P?
MP2618EV-LF-P integrates cycle-by-cycle overcurrent protection, thermal shutdown (150°C with 20°C hysteresis), NTC-based temperature fault detection, programmable charge timer (3-hour total, 30-minute trickle), under-voltage lockout (3.2V typical), and automatic recharge inhibition below 4.0V/cell. All protections trigger CHGOK open-drain assertion for system-level fault reporting.
Is MP2618EV-LF-P RoHS-compliant and lead-free?
Yes. The "-LF" suffix in MP2618EV-LF-P denotes lead-free, RoHS-compliant packaging. The device meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) and is qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
MP2618EV-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 2 ~ 3
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Current, Over Temperature
- Charge Current - Max:
- 2A
- Battery Pack Voltage:
- 12.6V
- Voltage - Supply (Max):
- 24V
- Interface:
- -
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
MP2618EV-LF-P FAQ
1.How can I place an order for MP2618EV-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2618EV-LF-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 MP2618EV-LF-P reliable?
The price and inventory of MP2618EV-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2618EV-LF-P is usually 5 days.
3.What payment methods are accepted for MP2618EV-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2618EV-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2618EV-LF-P?
MP2618EV-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2618EV-LF-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 MP2618EV-LF-P?
For technical support, including MP2618EV-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2618EV-LF-P requirements.
6.How does Aetrix verify that MP2618EV-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2618EV-LF-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 MP2618EV-LF-P meets industry standards.
7.What is the process for return or replacement of MP2618EV-LF-P?
All MP2618EV-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2618EV-LF-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 MP2618EV-LF-P part is unused and in its original packaging.
Return procedure for MP2618EV-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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