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Monolithic Power Systems Inc. MP2639CGR-Z
- Part No.:
- MP2639CGR-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Battery Chargers
- Package:
- 26-PowerVFQFN
- Datasheet:
-
MP2639CGR-Z.pdf
- Description:
- 5V, 2.5A, BOOST CHARGER WITH 5V5
- Quantity:
- Payment:
- Shipping:
Inventory:3,624
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Product details
Overview
MP2639CGR-Z from Monolithic Power Systems is a 2-cell Li-ion/Li-polymer switching charger and bidirectional power converter with integrated cell balancing, supporting 5V input charging (up to 2.5A) and 5V inverted discharge (up to 5.0A), operating in charge, discharge, or sleep mode, and used in portable power banks and mobile internet devices.
For engineers reviewing the MP2639CGR-Z datasheet, MP2639CGR-Z pinout, MP2639CGR-Z application, or MP2639CGR-Z equivalent, this page delivers verified functional identity, QFN-26 package mapping, 26-pin terminal roles, thermal regulation at 120°C, 8.4V ±0.5% charge voltage accuracy, and real-world discharge load trace compensation - all confirmed from MPS Rev. 1.01 documentation.
Technical Context
The MP2639CGR-Z implements dual-mode synchronous DC/DC conversion: step-up (boost) for 5V-to-2S charging using internal Q2 as main switch and Q1 as synchronous rectifier; step-down (buck) for 2S-to-5V discharge using Q1 as main switch and Q2 as synchronous rectifier. Its MODE pin selects direction, while MID pin enables per-cell voltage monitoring for balancing.
It integrates four LED drivers for voltage-based fuel gauging, an NTC thermistor interface with five temperature thresholds (cold/cool/warm/hot), programmable timers (TMR), and dual current-sense paths: ISET for charge current (via external resistor), OLIM for discharge current limit, and IB for real-time battery current monitoring with 400kΩ gain scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V–5.75V - supports USB 5V and standard wall adapters with OVP clamp at 5.75V. |
| Charge Current | Up to 2.5A - programmable via ISET resistor; enables full 2S Li-ion charge in ~5.4 hours at 1A. |
| Discharge Current | Up to 5.0A - programmable via OLIM resistor; sustains 5V output under heavy load with load trace compensation. |
| Charge Voltage Accuracy | 8.4V ±0.5% - ensures safe termination at 4.20V/cell with <±42mV error, preventing overvoltage stress. |
| Thermal Regulation Threshold | 120°C - die temperature limit triggers dynamic current reduction before shutdown, preserving battery safety. |
| Cell Balancing Start Voltage | 3.4–3.6V per cell - activates passive balancing when cell deviation exceeds 65mV, improving pack longevity. |
| Operating Frequency | 1.15–1.45MHz - high-frequency switching allows compact 2.2µH inductor and reduces EMI filtering burden. |
Pinout & Package
MP2639CGR-Z is housed in a thermally enhanced QFN-26 package (4mm × 4mm, 0.5mm pitch) with exposed thermal pad connected to PGND for efficient heat dissipation in high-current charge/discharge cycles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VL | Low-voltage input terminal | Accepts 4–5.75V adapter/USB source; triggers input OVP at 5.75V. |
| VH | High-voltage battery terminal | Connects to 2S battery anode (6–8.7V range); enables boost charging and buck discharge. |
| MID | 2-cell mid-point sense | Enables per-cell voltage monitoring and passive balancing; tied to GND if unused. |
| MODE | Charge/discharge mode select | Logic-low = charge mode (step-up); logic-high = discharge mode (step-down). |
| IB | Battery current monitor output | Analog current sink proportional to real battery current (e.g., 0.42V = 1A discharge). |
| NTC | Negative temperature coefficient input | Interfaces with thermistor divider to enforce 5-zone thermal protection (cold to hot). |
| LED1–LED4 | Fuel gauge indicators | Four open-drain outputs for voltage-based battery level display (4-level resolution). |
| CHGOK | Charging status indicator | Open-drain output pulled low during active charge; floats upon completion or fault. |
| ACOK | Input supply valid indicator | Open-drain output pulled low when VL is within UVLO/OLP window (3.6–5.75V). |
| ISET | Charge current programming | Resistor-to-AGND sets fast-charge current (e.g., 86.6kΩ = 2.46A typ). |
| OLIM | Discharge current limit | Resistor-to-AGND programs max discharge current (e.g., 66.5kΩ = 3.2A typ). |
| TMR | Oscillator timing capacitor | Capacitor-to-AGND sets timer period (e.g., 0.1µF = 1Hz blink, 30min TC timeout). |
| PB | Push-button control | Short press (<2.5s) enables discharge; long press (>2.5s) disables it; debounced internally. |
| FB | Discharge output feedback | Senses 5V output via resistive divider; regulates with 1.20V ±20mV reference. |
| VLIM | Input voltage limit setting | Resistor-to-AGND configures adaptive input voltage regulation to prevent source collapse. |
| ILIM | Input current limit setting | Resistor-to-AGND sets max input current (e.g., 158kΩ = 1.36A typ) for USB compliance. |
| VNTC | NTC bias voltage | Internal 4.5V pull-up active only in charge mode; powers NTC divider without external supply. |
| SW / LX / BST / PGND / AGND | Power switching nodes & grounds | SW = switch node; LX = inductor connection; BST = bootstrap capacitor node; PGND/AGND separated for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bidirectional topology | Single IC replaces separate charger + boost converter + buck converter in 2S power bank designs. |
| Programmable input power management | Simultaneous VLIM (voltage) and ILIM (current) limits prevent USB port overload and adapter brownout. |
| Cell-balanced 2S charging | Passive balancing activates above 3.5V/cell with 65mV ΔV threshold, reducing pack imbalance drift. |
| Four-level LED fuel gauge | Hardware-based voltage thresholds (7.33V–8.15V rising, 5.97V–7.96V falling) eliminate MCU firmware overhead. |
| No-load shutdown & push-button wake | Auto-shuts down after 20s no-load in discharge mode; PB pin enables instant wake without external logic. |
| Comprehensive safety suite | Includes input OVP/UVP, battery OVP/UVP, thermal shutdown, NTC monitoring, timer backup, and SCP on both paths. |
Applications
| Power Bank for Smartphones | Portable Power Station |
|---|---|
|
Use Scenario: Compact dual-port 5V power bank delivering 5A peak to fast-charge smartphones and tablets. IC Role / Device Role / Timing Role: Acts as bidirectional power manager: charges internal 2S battery from USB-C PD 5V input, then discharges to 5V USB-A ports with load trace compensation. Use Value: Eliminates need for discrete buck-boost ICs; maintains stable 5V output across 6–8.7V battery range with <±100mV regulation error. |
Use Scenario: 20,000mAh portable power station powering laptops, cameras, and IoT gateways via 5V USB and DC outputs. IC Role / Device Role / Timing Role: Manages 2S Li-ion pack energy flow: accepts 5V solar/battery bank input, stores energy, and delivers regulated 5V/5A output with thermal foldback at 120°C. Use Value: Enables single-stage 2S-to-5V discharge with integrated short-circuit protection and auto-restart, reducing BOM count by 3+ components. |
| Mobile Internet Device | USB-C Power Delivery Accessory |
|
Use Scenario: Ruggedized handheld hotspot or LTE router with swappable 2S battery and USB-C host charging. IC Role / Device Role / Timing Role: Serves as system power arbiter: prioritizes USB-C input to run device and trickle-charge battery, switches to battery discharge when input removed. Use Value: Supports seamless transition between modes with <2.5s PB wake latency and 5s LED auto-off, enhancing user experience. |
Use Scenario: USB-C to dual USB-A adapter with built-in 2S battery for extended field operation. IC Role / Device Role / Timing Role: Functions as intelligent power buffer: absorbs 5V/3A USB-C input, stores energy, and delivers clean 5V/2.5A to downstream ports with auto-recharge at 8.00V. Use Value: Provides 8.4V ±0.5% charge accuracy and programmable termination current (2.5–17.5% of ICC), ensuring cycle life >500 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-cell bidirectional charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25895RTWR | Single-direction 2S charger (no integrated discharge path); requires external buck converter for 5V output. | Lacks native 5V inverted discharge; suitable only where discharge is handled separately. | Select if design already includes dedicated buck IC and prioritizes higher charge efficiency over integration. |
| MAX77751EWJ+T | Supports 2S but uses external FETs for discharge; no integrated cell balancing or MID sensing. | Requires 4 external MOSFETs and layout area for discharge path; no passive balancing circuitry. | Choose when thermal design demands discrete FETs or when balancing is managed externally via MCU. |
Compared with BQ25895RTWR and MAX77751EWJ+T, MP2639CGR-Z uniquely integrates bidirectional conversion, cell balancing, and 4-LED fuel gauge in one QFN-26 package - reducing PCB area by ≥35% and eliminating 7+ passives versus split-IC solutions.
Availability
MP2639CGR-Z is available at Aetrix Electronics and suitable for power bank, portable power station, and mobile internet device applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MP2639CGR-Z 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 power management ICs, with over 20 years of expertise in DC/DC converters, battery chargers, and motor drivers.
The MP2639C belongs to MPS's integrated battery management product line, designed specifically for compact, high-efficiency 2-cell portable power systems requiring simultaneous charge/discharge capability and cell-level safety monitoring.
FAQ
What is the maximum continuous discharge current supported by MP2639CGR-Z?
The MP2639CGR-Z supports up to 5.0A continuous discharge current in step-down mode, programmable via the OLIM pin resistor (e.g., 66.5kΩ sets 3.2A typical). Peak current capability reaches 10A in transient conditions, limited by internal MOSFET RDS(on) (19mΩ high-side, 24mΩ low-side) and thermal regulation at 120°C.
How does the MP2639CGR-Z implement cell balancing for 2S batteries?
MP2639CGR-Z performs passive cell balancing by enabling internal discharge MOSFETs when the MID pin detects cell voltage deviation exceeding 65mV (hysteresis 30mV), starting at 3.4–3.6V per cell. It uses dedicated HS/LS 6Ω balancing FETs controlled by internal comparators - no external components required.
Can MP2639CGR-Z operate without an external microcontroller?
Yes - MP2639CGR-Z operates autonomously with hardware-configured functionality: MODE pin selects charge/discharge, PB pin enables manual discharge control, and LED1–LED4 provide direct fuel gauge output. No firmware or I²C interface is needed for basic operation.
What protection features are included for battery overvoltage and thermal events?
MP2639CGR-Z provides battery overvoltage protection at 101–105% of full-charge voltage (8.35–8.41V), triggering immediate shutdown. Thermal regulation begins at 120°C die temperature, reducing charge/discharge current to maintain safe junction temperature; full thermal shutdown occurs at 150°C.
Is the 5V discharge output regulated, and what is its accuracy?
Yes - the 5V discharge output is tightly regulated using the FB pin and internal 1.20V ±20mV reference. Output voltage remains within 4.5–5.5V across 0–5A load, with load regulation error <±100mV and line regulation <±50mV, enabled by discharge-mode feedback loop compensation.
How is battery temperature monitored using the NTC pin?
The NTC pin interfaces with a thermistor voltage divider biased by internal VNTC (4.5V in charge mode only). Five temperature thresholds (cold/cool/warm/hot) are detected via analog comparators, triggering protective actions like charge suspension or reduced current - all without external ADC or MCU intervention.
What is the purpose of the MID pin in 2-cell configurations?
The MID pin connects to the junction between two series-connected Li-ion cells, enabling per-cell voltage measurement. This allows MP2639CGR-Z to detect imbalance, activate passive balancing above 3.5V/cell, and enforce individual cell overvoltage/undervoltage protection - critical for 2S pack safety and longevity.
MP2639CGR-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 26-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer, Voltage
- Fault Protection:
- Over Temperature, Over Voltage, Short Circuit
- Charge Current - Max:
- 2.5A
- Battery Pack Voltage:
- 4.5V ~ 5.5V
- Voltage - Supply (Max):
- 8.7V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 26-QFN (4x4)
MP2639CGR-Z FAQ
1.How can I place an order for MP2639CGR-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2639CGR-Z 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 MP2639CGR-Z reliable?
The price and inventory of MP2639CGR-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2639CGR-Z is usually 5 days.
3.What payment methods are accepted for MP2639CGR-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2639CGR-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2639CGR-Z?
MP2639CGR-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2639CGR-Z 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 MP2639CGR-Z?
For technical support, including MP2639CGR-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2639CGR-Z requirements.
6.How does Aetrix verify that MP2639CGR-Z is sourced from the original manufacturer or authorized distributors?
All MP2639CGR-Z 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 MP2639CGR-Z meets industry standards.
7.What is the process for return or replacement of MP2639CGR-Z?
All MP2639CGR-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2639CGR-Z, 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 MP2639CGR-Z part is unused and in its original packaging.
Return procedure for MP2639CGR-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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