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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Chargers

Monolithic Power Systems Inc. MP26057DQ-LF-Z

Name: MP26057DQ-LF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP26057DQ-LF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP26057DQ-LF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Battery Chargers

Package:: 10-VFDFN Exposed Pad

Datasheet:: MP26057DQ-LF-Z.pdf

Description:: IC BATT CHG LI-ION 1CELL 10QFN

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Product details

Overview

MP26057DQ-LF-Z from Monolithic Power Systems is a linear single-cell Li-ion/Li-polymer travel charger IC with integrated 28V input surge tolerance, programmable 200mA–1A constant-current charging, 4.2V ±0.75% battery voltage regulation, and dual LED status indication (RED/GRN). It operates from 3.5V–7V inputs (USB or adapter), includes trickle charge for deeply discharged batteries (<2.6V), auto-recharge at 4.0V, and thermal shutdown at 105°C–135°C - deployed in compact portable electronics requiring safe, space-constrained battery management.

For engineers reviewing the MP26057DQ-LF-Z datasheet, MP26057DQ-LF-Z pinout, MP26057DQ-LF-Z application, or MP26057DQ-LF-Z equivalent, key selection criteria include its 3mm×3mm QFN10 package with exposed thermal pad, programmable ICHG via ISET resistor, IBF-based termination threshold, NTC thermistor interface for 0°C–50°C charging control, and integrated timer limiting total charge duration to prevent dead-battery overcharging.

Technical Context

The MP26057DQ-LF-Z implements a linear CC/CV charging architecture with analog current and voltage regulation loops. Its internal die temperature limiting uses dynamic current throttling (saw-tooth waveform) rather than hard shutdown, enabling graceful thermal derating without interrupting charge state transitions.

It integrates dual open-drain status outputs (RED/GRN) driven by a finite-state machine that interprets battery voltage, NTC resistance, timer cycles (32768 for trickle, 262144 for full cycle), and IBF threshold crossing to generate unambiguous visual fault codes - including flashing for timeout or thermal fault, and static ON/OFF for active charging or full-battery states.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.5V–7V operating; withstands up to 28V transient surges - enables direct connection to unregulated wall adapters without external OVP.
Charge Current Range	200mA–1A programmable via ISET resistor - supports flexible battery capacity scaling from 500mAh to 2000mAh cells.
Battery Voltage Accuracy	±0.75% over –5°C to +75°C - ensures precise 4.2V CV termination critical for Li-ion cell longevity and safety.
Trickle Threshold	2.45V–2.75V rising battery voltage - initiates preconditioning for cells below safe CC entry voltage.
NTC Temperature Window	Valid R_NTC = 32.3kΩ (50°C) to 376.6kΩ (0°C) - maps directly to TH11-4H104F thermistor for certified 0°C–50°C charging range.
Timer Resolution	5Hz oscillator (CTMR = 2.2µF) - provides deterministic 32768-cycle (≈1.1h) trickle timeout and 262144-cycle (≈8.7h) total charge limit.
Standby Current	125µA from VIN - minimizes system power loss when adapter is connected but battery is full or absent.
Battery Reverse Leakage	<1µA with VIN floating - prevents battery self-discharge through charger IC when input is disconnected.

Pinout & Package

MP26057DQ-LF-Z is housed in a thermally enhanced 10-pin 3mm × 3mm QFN package with exposed thermal pad (Pin 5), rated for –40°C to +85°C ambient operation. The exposed pad must be soldered to a solid ground plane for thermal and electrical integrity.

Pin/Terminal	Circuit Role	Design Meaning
1 IN	Input Supply	Accepts 3.5V–7V DC input; tolerates 28V transients - connects directly to AC/DC adapter or USB VBUS.
2 GRN	Open-Drain Status Output	Sinks current to drive green LED; logic-low during active charging, high-impedance at full-battery or fault.
3 RED	Open-Drain Status Output	Sinks current to drive red LED; logic-low during fault conditions (timeout, thermal, NTC out-of-range), high-impedance otherwise.
4 TMR	Timer Oscillator Control	Connects to timing capacitor (e.g., 2.2µF) for 5Hz internal clock; shorting to GND disables timer function.
5 GND / Exposed Pad	Ground Reference & Thermal Path	Primary ground return and mandatory thermal conduction path - must be soldered to PCB ground plane.
6 SS	Soft-Start Timing	Connects to ≥0.1µF capacitor to limit inrush current during power-up; prevents input voltage sag.
7 ISET	Constant Current Programming	Resistor-to-ground sets CC value (200mA–1A); 3.3kΩ yields ~500mA per datasheet table.
8 IBF	Battery Full Threshold Programming	Resistor-to-ground sets termination current (e.g., 20kΩ → ~100mA); triggers CV exit and charge stop.
9 NTC	Thermistor Interface	Forms voltage divider with internal bias; monitors battery pack temperature via 100kΩ NTC (0°C–50°C range).
10 BATT	Charger Output	Delivers regulated CC/CV to single-cell Li-ion anode; connects directly to battery positive terminal.

Key Features

Feature	Design Value
Integrated Input Surge Protection	Withstands 28V transients without external TVS - eliminates need for discrete OVP components in travel charger designs.
Programmable Trickle-to-CC Transition	Automatically enters 10% I_CHG preconditioning below 2.6V, then transitions to full CC at 2.6V - prevents lithium plating on deeply discharged cells.
Dual-LED Fault Signaling	RED/GRN pins encode 5 distinct states (charging, full, timeout, thermal fault, NTC fault) via static ON/OFF or synchronized flashing - enables user-visible diagnostics without MCU involvement.
Adaptive Thermal Regulation	Reduces average charge current via saw-tooth modulation above 105°C - maintains charging continuity while preventing thermal runaway or PCB delamination.
Auto-Recharge Logic	Reinitiates CC charge when VBATT drops to 4.0V ±100mV - compensates for battery self-discharge and maintains full state without manual intervention.
Low-Leakage Battery Isolation	<1µA reverse current from BATT to IN when VIN is absent - preserves battery charge for >1 year in storage without external load switches.

Applications

Smartphone Travel Charger

Digital Camera Power Module

Use Scenario: Compact wall-wart charger for smartphones with no onboard charging controller, powered from 5V USB or 5–6.5V adapter.

IC Role / Device Role / Timing Role: Primary linear Li-ion charger managing CC/CV profile, NTC monitoring, and LED status feedback - replaces discrete charge management circuitry.

Use Value: Enables sub-15mm-thick travel chargers with 28V surge immunity, eliminating need for external OVP and reducing BOM count by 4+ components.

Use Scenario: Integrated battery charging subsystem in DSLR or mirrorless camera bodies using removable Li-ion packs.

IC Role / Device Role / Timing Role: Single-chip solution handling trickle preconditioning, CC/CV regulation, thermal cutoff, and recharge hysteresis - manages battery health across varying ambient temperatures.

Use Value: Guarantees safe charging between 0°C–50°C using factory-calibrated NTC, with automatic 4.0V recharge to maintain camera readiness after standby discharge.

Portable Bluetooth Speaker

Handheld Medical Monitor

Use Scenario: Rechargeable speaker with built-in 2000mAh Li-ion battery, charged via micro-USB port with variable input voltage (4.75–5.25V).

IC Role / Device Role / Timing Role: Linear charger providing stable 4.2V CV output with <0.75% accuracy, low 125µA standby draw, and LED status indication.

Use Value: Extends battery cycle life via precise voltage regulation and prevents overcharge via programmable IBF termination - critical for consumer audio reliability.

Use Scenario: Battery-powered vital signs monitor used in field clinics, requiring fail-safe charging of medical-grade Li-ion cells under intermittent power.

IC Role / Device Role / Timing Role: Safety-critical charger enforcing strict 0°C–50°C NTC window, 8.7h total charge timeout, and thermal foldback to avoid battery thermal excursion.

Use Value: Meets IEC 62368-1 thermal safety requirements via on-die temperature limiting and deterministic timer-based dead-battery protection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Li-ion single-cell charging applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ24075RGTR	4.2V CV accuracy ±0.5%, higher 1.5A max charge current, no integrated 28V surge tolerance - requires external OVP diode or TVS.	Targets higher-power portable devices (e.g., tablets); lacks native NTC window comparator - needs external ADC or comparator for temperature monitoring.	Select when higher charge current and tighter CV accuracy are prioritized over surge resilience and integrated thermal sensing.
TP4056	Fixed 1A charge current, no programmable trickle threshold or timer, no NTC interface, 1µA quiescent current - minimal feature set, lower cost.	Suitable for basic consumer gadgets (power banks, toys); no safety certifications for medical/industrial use - lacks thermal foldback or timeout protection.	Select only for cost-sensitive, non-safety-critical applications where fixed parameters and absence of diagnostics are acceptable.

Compared with BQ24075RGTR and TP4056, MP26057DQ-LF-Z uniquely combines 28V surge tolerance, programmable CC/CV thresholds, integrated NTC window detection, and deterministic timer-based dead-battery protection - making it optimal for certified portable medical, ruggedized consumer, and travel-oriented charging systems.

Availability

MP26057DQ-LF-Z is available at Aetrix Electronics and suitable for smartphone travel chargers, digital camera power modules, portable Bluetooth speakers, and handheld medical monitors requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term lifecycle support.

Supply support for MP26057DQ-LF-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 analog and mixed-signal ICs for power management, motor drive, and automotive applications - headquartered in Kirkland, WA, with global design and support centers.

The MP26057 belongs to MPS's battery management IC product line, engineered specifically for compact, high-reliability linear Li-ion charging in space-constrained portable electronics - emphasizing integrated protection, visual diagnostics, and robustness against real-world adapter surges and thermal stress.

FAQ

What is the maximum allowable input voltage for continuous operation?

The MP26057DQ-LF-Z operates continuously within 3.5V–7V input range. Its absolute maximum rating is +28V on the IN pin, which it tolerates as transient surge only - sustained voltage above 7V will trigger internal UVLO shutdown and may damage the device if exceeded beyond absolute limits.

How is the charge termination current (IBF) programmed, and what resistor value yields 100mA?

IBF is set by connecting a resistor R_BF from the IBF pin to GND, using the formula I_BF = 1.7A·kΩ / R_BF. For 100mA termination, R_BF = 17kΩ. Datasheet recommends R_BF between 2×R_PGM and 10×R_PGM, where R_PGM sets the CC current.

Can the NTC function be disabled, and if so, how?

Yes - the NTC function is disabled by replacing the NTC thermistor with a fixed 100kΩ resistor from Pin 9 (NTC) to GND. This configures the comparator to always see a valid mid-range voltage, bypassing temperature-based charge inhibition while retaining all other protections.

What happens during thermal overload, and does the device shut down completely?

At die temperature ≥105°C, MP26057DQ-LF-Z enters soft thermal shutdown: charge current modulates into a saw-tooth waveform with reduced average value, maintaining partial charging while limiting power dissipation. It does not fully disable - current resumes normal DC operation once temperature falls below hysteresis (≥10°C below trip point).

Is the TMR pin required for basic charging functionality?

No - the TMR pin is optional. Shorting it to GND disables both trickle-timeout (32768 cycles) and total-charge-timeout (262144 cycles) functions. Basic CC/CV charging, auto-recharge, and NTC monitoring remain fully operational without timer engagement.

What is the purpose of the SS (Soft-Start) pin, and what capacitor value is recommended?

The SS pin controls inrush current during power-up by slowing the internal reference ramp. A 0.1µF ceramic capacitor from SS to GND yields ~100ms soft-start time, preventing input voltage droop and reducing stress on upstream regulators or USB ports.

Does MP26057DQ-LF-Z support charging from USB 2.0 ports, and what is the minimum input voltage?

Yes - it supports standard USB 2.0 (5V ±5%) and USB-C 5V sources. Minimum functional input is 3.5V; below this, the IC remains disabled to prevent battery discharge back into the source. Input UVLO rising threshold is 2.5V–3.5V with 100mV hysteresis.

MP26057DQ-LF-Z 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 Temperature

Charge Current - Max:: 1A

Battery Pack Voltage:: 4.2V

Voltage - Supply (Max):: 5.5V

Interface:: USB

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-QFN (3x3)

MP26057DQ-LF-Z FAQ

1.How can I place an order for MP26057DQ-LF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP26057DQ-LF-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 MP26057DQ-LF-Z reliable?

The price and inventory of MP26057DQ-LF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP26057DQ-LF-Z is usually 5 days.

3.What payment methods are accepted for MP26057DQ-LF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP26057DQ-LF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP26057DQ-LF-Z?

MP26057DQ-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP26057DQ-LF-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 MP26057DQ-LF-Z?

For technical support, including MP26057DQ-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP26057DQ-LF-Z requirements.

6.How does Aetrix verify that MP26057DQ-LF-Z is sourced from the original manufacturer or authorized distributors?

All MP26057DQ-LF-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 MP26057DQ-LF-Z meets industry standards.

7.What is the process for return or replacement of MP26057DQ-LF-Z?

All MP26057DQ-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP26057DQ-LF-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 MP26057DQ-LF-Z part is unused and in its original packaging.

Return procedure for MP26057DQ-LF-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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