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Microchip Technology MIC79110-4.2BML-TR
- Part No.:
- MIC79110-4.2BML-TR
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-VFDFN Exposed Pad, 10-MLF®
- Datasheet:
-
MIC79110-4.2BML-TR.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 10MLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
MIC79110-4.2BML-TR from Micrel is a fixed-output 4.2V linear lithium-ion battery charger IC with 1.2A max charge current, ±0.75% output voltage accuracy over –5°C to +60°C, and integrated reverse-polarity protection. It operates from 2.5V–16V input, delivers low dropout (550mV at 700mA), and supports end-of-charge detection via programmable digital flag and analog current monitor - used in portable consumer devices requiring single-cell Li-ion charging.
For engineers reviewing the MIC79110-4.2BML-TR datasheet, MIC79110-4.2BML-TR pinout, MIC79110-4.2BML-TR application, or MIC79110-4.2BML-TR equivalent, key selection criteria include fixed 4.2V output compliance, RSET/REOC resistor-programmable current limits, thermal shutdown behavior, DFN-10 package footprint, and analog/digital charge status signaling capability.
Technical Context
The MIC79110-4.2BML-TR implements constant-current/constant-voltage (CC/CV) charging for single-cell Li-ion batteries using an internal pass transistor. Its precision voltage regulation (±0.75% over –5°C to +60°C) and current-limit accuracy (±5% over –40°C to +85°C) ensure safe cell termination without external compensation.
It integrates dual status outputs: ACHG provides 1/1000×BAT current as a proportional analog current source; DEOC is an N-channel open-drain digital flag toggling between active-low (charging) and high-impedance (end-of-charge), both set via external resistors (RSET and REOC) tied to ground.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.2V ±0.75% over –5°C to +60°C - matches standard Li-ion cell termination voltage with minimal drift across temperature. |
| Max Charge Current | 1.2A - supports rapid CC-stage charging for cells rated ≥1200mAh without external current amplification. |
| Input Voltage Range | 2.5V to 16V - accommodates USB, wall adapters, and automotive-derived supplies while maintaining regulation. |
| Dropout Voltage | 550mV at 700mA over temperature - enables operation with low VIN–VOUT margin, reducing power loss and thermal stress. |
| Current Limit Accuracy | ±5% over –40°C to +85°C - ensures predictable CC-phase duration and avoids overcurrent stress on battery or PCB traces. |
| Junction Temp Range | –40°C to +125°C - supports industrial and automotive-adjacent environments where ambient heat buildup occurs. |
Pinout & Package
Package: 10-pin 3mm × 3mm leadless DFN (ML), exposed thermal pad, RoHS-compliant, θJA = 60°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SD | Shutdown control input | Active-low logic enable; <0.93V = ON, >1.05V = OFF; 60mV hysteresis prevents chatter during threshold transitions. |
| 2 RSET | Current limit programming node | Resistor-to-ground sets CC current per IRSET = (0.2V/RSET) × 1000; 167Ω yields 1.2A nominal. |
| 3 SNS | Battery sense connection | Direct connection to battery anode; enables accurate voltage regulation independent of PCB trace resistance. |
| 4 BAT | Battery terminal | Main current path to Li-ion cell; designed for low-impedance routing to minimize voltage drop during high-current charge. |
| 5,6 VIN | Power input supply | Dual pins reduce IR drop and thermal rise under 1.2A load; accept 2.5V–16V unregulated DC input. |
| 7 ACHG | Analog charge monitor | Current-source output equal to 1/1000 × IBAT - allows real-time current measurement with simple RC filter and ADC. |
| 8 DEOC | Digital end-of-charge flag | N-channel open-drain; pulled low during charge, high-Z at EOC - interfaces directly with µC GPIO or LED driver. |
| 9 REOC | End-of-charge threshold | Resistor-to-ground sets IEOC = (0.2V/REOC) × 1000; 4kΩ configures 50mA EOC threshold for 500mAh cells. |
| 10 GND | Ground reference | Common return for all internal circuits and external resistors; must be low-impedance connection to thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated reverse-polarity protection | Limits reverse-battery current to <20µA when VBAT > VIN, eliminating need for external blocking diode or MOSFET. |
| Programmable end-of-charge flag | DEOC pin provides reliable, resistor-set current threshold detection without µC polling or complex timing logic. |
| Analog current monitor (ACHG) | Delivers scalable 1/1000×IBAT current - enables precise charge profiling and SOC estimation using low-cost ADCs. |
| Thermal shutdown + current limiting | Internally limits power dissipation and disables output above +125°C junction temp, preventing damage during sustained high-load operation. |
| Low dropout voltage | 550mV at 700mA ensures usable headroom even with marginal input sources like aging USB ports or low-VIN wall adapters. |
Applications
| Cellular Phones and PDAs | Digital Cameras and Camcorders |
|---|---|
Use Scenario: Compact handheld device with single-cell Li-ion battery requiring autonomous charging without host processor intervention. IC Role / Device Role / Timing Role: Standalone linear charger managing full CC/CV profile, end-of-charge detection, and battery protection functions. Use Value: Eliminates need for dedicated battery management MCU; fixed 4.2V output ensures compatibility with standard Li-ion chemistries. | Use Scenario: High-current burst capture device needing fast recharge between video sessions while maintaining thermal safety. IC Role / Device Role / Timing Role: Primary charge controller delivering up to 1.2A CC current and precise 4.2V CV termination. Use Value: Low dropout (550mV) minimizes self-heating during high-current charge, extending PCB lifetime and enabling smaller heatsinking. |
| Notebook PCs (Sub-12") | Portable Meters |
Use Scenario: Small-form-factor notebook or tablet with integrated removable Li-ion pack and space-constrained charging circuitry. IC Role / Device Role / Timing Role: Fixed-output charger providing regulated 4.2V with ±0.75% accuracy to maximize cycle life and capacity retention. Use Value: Tight voltage tolerance prevents overvoltage stress on aging cells, supporting >500-cycle longevity in field-deployed units. | Use Scenario: Battery-powered handheld test instrument requiring long runtime, low quiescent current, and reliable end-of-charge signaling. IC Role / Device Role / Timing Role: Charging supervisor generating analog (ACHG) and digital (DEOC) status outputs for embedded firmware monitoring. Use Value: Dual-status outputs allow simultaneous real-time current readout and automated charge termination without additional sensors or logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Li-ion battery charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TP4056 | Fixed 4.2V output, 1A max current, no analog current monitor, no programmable EOC threshold. | Lacks ACHG output and resistor-set end-of-charge flexibility; suitable only for basic charge-only use cases. | Select TP4056 only if design requires lowest BOM cost and does not require current monitoring or adjustable EOC. |
| BQ24075 | 4.2V fixed output, 1.2A max, integrated USB/AC input select, thermal regulation, but uses MSOP-16 package. | Includes input source arbitration and more advanced thermal foldback; larger footprint and higher pin count than DFN-10. | Choose BQ24075 when dual-input (USB + adapter) support and enhanced thermal management are required despite larger layout area. |
Compared with TP4056 and BQ24075, the MIC79110-4.2BML-TR uniquely balances compact DFN-10 packaging, dual-status signaling (ACHG + DEOC), and resistor-programmable thresholds - making it optimal for space-constrained, firmware-light designs needing precise charge control without input multiplexing.
Availability
MIC79110-4.2BML-TR is available at Aetrix Electronics and suitable for cellular phones, portable meters, digital cameras, and cradle/car chargers requiring stable component supply, consistent parametric performance, and long-term lifecycle availability.
Supply support for MIC79110-4.2BML-TR 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
Micrel Inc. was a U.S.-based analog and mixed-signal semiconductor company headquartered in San Jose, CA, specializing in power management, interface, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC79110 product line was designed specifically for cost-sensitive, space-constrained portable electronics requiring fully integrated, resistor-configurable linear Li-ion charging - emphasizing simplicity, accuracy, and robust protection without external FETs or controllers.
FAQ
What is the maximum continuous charge current supported by the MIC79110-4.2BML-TR?
The MIC79110-4.2BML-TR supports a maximum continuous charge current of 1.2A, achieved by connecting a 167Ω resistor from RSET pin to ground. This value is guaranteed over –40°C to +85°C with ±5% accuracy. Exceeding this current risks thermal shutdown or reduced long-term reliability due to internal power dissipation limits in the DFN-10 package.
Does the MIC79110-4.2BML-TR require external MOSFETs or diodes for reverse-polarity protection?
No, the MIC79110-4.2BML-TR includes built-in reverse-polarity protection that limits reverse-battery current to less than 20µA when VBAT exceeds VIN, eliminating the need for external blocking diodes or MOSFETs. This feature reduces BOM count and PCB area while maintaining safety during incorrect battery insertion or accidental reversal.
How is end-of-charge detected using the MIC79110-4.2BML-TR?
The MIC79110-4.2BML-TR detects end-of-charge via two independent methods: the DEOC pin provides a digital open-drain signal that transitions to high-impedance when battery current falls below the threshold set by the REOC resistor; simultaneously, the ACHG pin delivers an analog current proportional to actual charge current (1/1000×IBAT), enabling firmware-based validation of EOC condition.
Can the MIC79110-4.2BML-TR operate from a 5V USB supply?
Yes, the MIC79110-4.2BML-TR operates from 2.5V to 16V input, making it fully compatible with standard 5V USB power sources. At 5V input and 4.2V output, the 800mV headroom supports up to ~700mA continuous charge current before dropout effects dominate; higher currents require >5.5V input to maintain regulation and avoid thermal derating.
What is the function of the SNS pin on the MIC79110-4.2BML-TR?
The SNS pin on the MIC79110-4.2BML-TR is the battery voltage sense node for the fixed-output version. It must be connected directly to the battery anode to enable accurate 4.2V regulation independent of voltage drop across the BAT pin's bond wire and PCB trace. This Kelvin sensing improves output accuracy and prevents premature CV-phase termination in high-current layouts.
MIC79110-4.2BML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad, 10-MLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- Over Current, Over Temperature, Reverse Current
- Charge Current - Max:
- 1.2A
- Battery Pack Voltage:
- 4.2V
- Voltage - Supply (Max):
- 16V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MLF® (3x3)
MIC79110-4.2BML-TR FAQ
1.How can I place an order for MIC79110-4.2BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC79110-4.2BML-TR 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 MIC79110-4.2BML-TR reliable?
The price and inventory of MIC79110-4.2BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC79110-4.2BML-TR is usually 5 days.
3.What payment methods are accepted for MIC79110-4.2BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC79110-4.2BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC79110-4.2BML-TR?
MIC79110-4.2BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC79110-4.2BML-TR 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 MIC79110-4.2BML-TR?
For technical support, including MIC79110-4.2BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC79110-4.2BML-TR requirements.
6.How does Aetrix verify that MIC79110-4.2BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC79110-4.2BML-TR 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 MIC79110-4.2BML-TR meets industry standards.
7.What is the process for return or replacement of MIC79110-4.2BML-TR?
All MIC79110-4.2BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC79110-4.2BML-TR, 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 MIC79110-4.2BML-TR part is unused and in its original packaging.
Return procedure for MIC79110-4.2BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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