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Monolithic Power Systems Inc. MP26121DQ-LF-P
- Part No.:
- MP26121DQ-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Battery Chargers
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
MP26121DQ-LF-P.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10QFN
- Quantity:
- Payment:
- Shipping:
Inventory:382
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Product details
Overview
MP26121DQ-LF-P from Monolithic Power Systems is a linear single-cell Li-ion/Li-polymer battery charger IC with integrated +28V input surge tolerance, programmable 200mA–1A constant-current charging, 4.20V ±1% CV regulation, 10% battery-full threshold, and flexible NTC thermistor interface for temperature-safe charging in portable electronics.
For engineers reviewing the MP26121DQ-LF-P datasheet, MP26121DQ-LF-P pinout, MP26121DQ-LF-P application, or MP26121DQ-LF-P equivalent, key selection criteria include its 28V input surge rating, 10% end-of-charge current threshold, thermal foldback behavior above 105°C, QFN-10 (3mm×3mm) package with exposed thermal pad, and NTC voltage window thresholds (1.197V/2.735V).
Technical Context
The MP26121 operates in three sequential charge phases-trickle (2.45–2.75V), constant-current (programmed via ISET resistor), and constant-voltage (4.20V ±1%)-with automatic recharge at 4.0V and termination when charge current falls to 10% of ICHG. It integrates a 5.4Hz internal oscillator driving a 262144-cycle safety timer.
Its proprietary VIN surge protection clamps transients up to +28V without external components, while the dual-threshold NTC comparator (VNTC_LOW = 1.197V, VNTC_UP = 2.735V) supports wide-range thermistor configurations using two external resistors. Thermal management reduces average ICHG above 105°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 6.5V nominal; survives +28V transient surges without damage |
| Battery Regulation Voltage | 4.20V ±1% at 100mA load - ensures precise full-charge cutoff for Li+ cells |
| Charge Current Range | 200mA to 1A programmable via ISET resistor - enables design flexibility across battery capacities |
| Battery-Full Threshold | 10% of programmed ICHG - triggers termination when CV-phase current decays to safe residual level |
| NTC Interface Thresholds | VNTC_LOW = 1.197V, VNTC_UP = 2.735V - defines valid thermistor resistance window for safe charging |
| Junction Temp Limit | 105°C to 135°C trip range - initiates thermal foldback before permanent damage occurs |
| Oscillator Frequency | 5.4Hz (CTMR = 2.2μF) - sets timing resolution for 32768-cycle trickle timeout and 262144-cycle total charge limit |
Pinout & Package
MP26121DQ-LF-P is housed in a thermally enhanced QFN-10 (3mm × 3mm) package with an exposed ground pad requiring solder connection to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Input supply rail | Accepts 3.5–6.5V adapter/USB input; withstands +28V surge transients |
| 2 ACOK | Open-drain fault status output | Active-high during faults (OVP, thermal, timer); floats high when input is valid (3V < VIN < 7V) |
| 3 CHG | Open-drain charge status output | Active-low during CC/CV charging; floats high at full-charge or fault; toggles during fault reporting |
| 4 TMR | Timer capacitor connection | Sets internal oscillator frequency (5.4Hz typical); shorting to GND disables timer |
| 5 GND / Exposed Pad | Power and signal reference | Must be soldered to large PCB ground plane for thermal dissipation and noise immunity |
| 6 SHDN | Enable control input | Logic-low or floating enables charger; logic-high disables all functions (200µA quiescent) |
| 7 SS | Soft-start capacitor node | Connects to GND via capacitor (e.g., 0.1µF) to limit inrush current ramp rate (80ms to 90% ICHG) |
| 8 ISET | Charge current programming | Resistor to GND sets ICHG (200–1000mA); 3.3kΩ yields ~500mA per datasheet table |
| 9 NTC | Thermistor interface input | Monitors NTC voltage divider; compares against 1.197V/2.735V thresholds to suspend charging outside safe temp range |
| 10 BATT | Charger output | Delivers regulated CC/CV to battery anode; reverse leakage <1µA when disabled |
Key Features
| Feature | Design Value |
|---|---|
| 28V Input Surge Tolerance | Eliminates need for external TVS diodes in USB/adapter-input designs subjected to ESD or hot-plug transients |
| 10% End-of-Charge Threshold | Enables reliable full-charge detection independent of battery aging or impedance drift over cycle life |
| Flexible NTC Interface | Supports diverse NTC types (e.g., EWTF03-103 J31 H) using only two external resistors - no microcontroller required |
| Intelligent Thermal Foldback | Reduces average charge current above 105°C junction temperature - prevents thermal runaway without shutdown |
| No External Blocking Diode | Integrated reverse-current protection eliminates discrete Schottky, saving board space and forward-drop losses |
Applications
| Smartphones | Digital Cameras |
|---|---|
Use Scenario: Integrated battery charging in compact, thermally constrained smartphone mainboards with USB-C input. IC Role / Device Role / Timing Role: Linear Li+ charger managing CC/CV profile, NTC-based thermal supervision, and CHG/ACOK status signaling to baseband processor. Use Value: Enables safe, certified charging under variable ambient temperatures and input surges up to +28V without external protection components. | Use Scenario: Rechargeable Li+ battery pack in DSLR/mirrorless cameras requiring fast, temperature-aware charging during field operation. IC Role / Device Role / Timing Role: Primary battery management IC executing trickle→CC→CV sequence with automatic 4.0V recharge and 262144-cycle hard timeout. Use Value: Guarantees battery longevity by enforcing strict 10% ICHG termination and preventing overcharge of degraded cells. |
| Portable Media Players | PDAs & Handheld Terminals |
Use Scenario: Low-power audio/video playback devices with limited PCB area and passive cooling. IC Role / Device Role / Timing Role: Single-chip charging solution delivering 500mA CC with soft-start (80ms), 4.20V CV regulation, and 1µA shutdown leakage. Use Value: Minimizes standby power loss and thermal rise while maintaining compliance with JEITA temperature profiles via NTC windowing. | Use Scenario: Industrial handheld computers used in logistics or field service with frequent hot-swap battery replacement. IC Role / Device Role / Timing Role: Robust charger IC providing fault indication (ACOK/CHG), input OVP (7V clamp), and auto-recharge on voltage sag. Use Value: Ensures uninterrupted operation by restarting charge immediately after battery insertion or voltage recovery to 4.0V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li+ battery charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ24075RGTR | Fixed 4.2V CV, 1A max, no programmable battery-full threshold; uses fixed 10% IBAT termination | Lacks flexible NTC interface - requires external ADC or comparator for temperature monitoring | Select if system already implements NTC sensing externally and prioritizes TI ecosystem support |
| TP4056 | Fixed 4.2V CV, 1A max, no input surge tolerance (>12V absolute max), no thermal foldback | No built-in thermal protection or NTC interface - relies entirely on external circuitry for safety | Select only for cost-sensitive, low-risk consumer applications with tightly regulated 5V input and ambient temperature control |
Compared with BQ24075RGTR and TP4056, MP26121DQ-LF-P uniquely combines 28V surge resilience, programmable ICHG, 10% adaptive end-of-charge detection, and integrated dual-threshold NTC monitoring - making it suitable for ruggedized portable designs where input transients and thermal variability are uncontrolled.
Availability
MP26121DQ-LF-P is available at Aetrix Electronics and suitable for smartphones, digital cameras, portable media players, and PDAs requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.
Supply support for MP26121DQ-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 for power conversion, battery management, and motor control.
The MP26121 belongs to MPS's linear battery charger product line, designed specifically for space-constrained portable electronics needing robust, integrated, and thermally aware single-cell Li+ charging without external protection components.
FAQ
What is the maximum input voltage the MP26121DQ-LF-P can safely withstand?
The MP26121DQ-LF-P features proprietary input surge protection rated to +28V. This is not a continuous operating voltage - the device operates normally between 3.5V and 6.5V, but will survive transient spikes up to +28V without latch-up or damage, eliminating the need for external TVS diodes in USB or wall-adapter interfaces.
How does the 10% battery-full threshold improve charging reliability?
The 10% threshold refers to termination when charge current drops to 10% of the programmed ICHG value during constant-voltage mode. Unlike fixed-time or voltage-only cutoffs, this method adapts to battery aging, internal resistance changes, and temperature effects - ensuring consistent full-charge detection across hundreds of cycles without overcharging.
Can the MP26121DQ-LF-P operate without an NTC thermistor?
Yes - the NTC pin can be configured for non-temperature applications. If unused, connect RT2 = ½ × RT1 between NTC and GND/VIN as specified in the datasheet. The IC will then disable NTC monitoring and proceed with charging, but thermal safety must be ensured externally or via ambient derating.
What happens when the junction temperature exceeds 105°C during charging?
Above 105°C, the MP26121DQ-LF-P initiates intelligent thermal foldback: it dynamically reduces average charge current to limit die temperature, slowing the charge process rather than halting it. This maintains safety while avoiding abrupt shutdowns that could disrupt user experience in thermally dense layouts.
Is the QFN-10 package lead-free and RoHS-compliant?
Yes - the "-LF" suffix in MP26121DQ-LF-P explicitly denotes lead-free, RoHS-compliant packaging. The device meets EU RoHS Directive 2011/65/EU requirements, with homogeneous material analysis confirming Pb content <1000 ppm and full compliance with restricted substances including Cd, Hg, Cr⁶⁺, PBB, and PBDE.
How is charge current programmed, and what resistor yields 1A output?
Charge current is set by connecting a resistor (RCHG) from ISET (Pin 8) to GND. Per the datasheet's RCHG vs. ICHG table, a 1.65kΩ resistor programs 1000mA. Layout best practices require short, low-inductance traces and local 0.1µF bypass near ISET to minimize noise-induced current variation.
Does the MP26121DQ-LF-P support automatic recharge, and at what voltage does it trigger?
Yes - automatic recharge activates when battery voltage drops to 4.0V (±0.1V hysteresis). This ensures the cell remains topped off without user intervention, extending usable runtime between manual charges while respecting Li+ voltage limits to prevent stress cycling.
MP26121DQ-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Timer
- Fault Protection:
- Over Voltage
- Charge Current - Max:
- 1A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 6.5V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-QFN (3x3)
MP26121DQ-LF-P FAQ
1.How can I place an order for MP26121DQ-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP26121DQ-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 MP26121DQ-LF-P reliable?
The price and inventory of MP26121DQ-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 MP26121DQ-LF-P is usually 5 days.
3.What payment methods are accepted for MP26121DQ-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP26121DQ-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP26121DQ-LF-P?
MP26121DQ-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP26121DQ-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 MP26121DQ-LF-P?
For technical support, including MP26121DQ-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP26121DQ-LF-P requirements.
6.How does Aetrix verify that MP26121DQ-LF-P is sourced from the original manufacturer or authorized distributors?
All MP26121DQ-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 MP26121DQ-LF-P meets industry standards.
7.What is the process for return or replacement of MP26121DQ-LF-P?
All MP26121DQ-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP26121DQ-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 MP26121DQ-LF-P part is unused and in its original packaging.
Return procedure for MP26121DQ-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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