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Microchip Technology MIC79050-4.2BMM-TR
- Part No.:
- MIC79050-4.2BMM-TR
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC79050-4.2BMM-TR.pdf
- Description:
- IC BATT CHG LI-ION 1CELL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,075
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Product details
Overview
MIC79050-4.2BMM-TR from Microchip Technology is a fixed-output 4.2 V linear lithium-ion battery charger IC with ±0.75% voltage accuracy over –5°C to +60°C, 380 mV dropout at 500 mA, and zero off-mode current. It integrates an on-chip PNP pass transistor, supports pulse charging via FB pin modulation, and targets compact portable Li-ion systems requiring high-precision termination.
For engineers reviewing the MIC79050-4.2BMM-TR datasheet, MIC79050-4.2BMM-TR pinout, MIC79050-4.2BMM-TR application, or MIC79050-4.2BMM-TR equivalent, this page delivers verified package mapping (Power MSOP-8), validated thermal shutdown/current-limit protection, confirmed EN/FB functionality, and real-world load-line and pulse-charging implementation guidance.
Technical Context
The MIC79050-4.2BMM-TR implements a precision bandgap-referenced linear regulator architecture with internal PNP pass element and error amplifier. Its feedback loop monitors BAT voltage against a trimmed 4.2 V reference, enabling constant-voltage charge termination with <0.75% drift across the Li-ion charging temperature range.
It features dual-stage protection: foldback current limiting (750–1000 mA) and thermal shutdown triggered by die temperature exceeding +125°C. The EN pin provides TTL/CMOS-compatible logic control (0.4 V low, ≥2.0 V high), while the FB pin allows external loop manipulation for pulse charging or forced output disable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Output Voltage | Fixed 4.2 V ±0.75% over –5°C to +60°C - ensures precise Li-ion cell termination without external resistor network. |
| Dropout Voltage | 380 mV typical at 500 mA - enables operation from low-headroom sources like unregulated wall adapters. |
| Input Voltage Range | +2.5 V to +16 V - accommodates wide-input unregulated supplies and avoids need for pre-regulation. |
| Ground Pin Current | 85 µA typical at 100 µA load; ≤3 µA in shutdown - minimizes system quiescent power during battery standby. |
| Reverse Leakage | 10 µA max at 4.2 V BAT - prevents significant self-discharge when input is disconnected or grounded. |
| Thermal Shutdown | Activates at +125°C junction temperature - protects device and battery under sustained overload or poor PCB heatsinking. |
| Enable Threshold | Logic-low ≤0.4 V disables output; logic-high ≥2.0 V enables - compatible with standard microcontroller GPIO without level shifting. |
Pinout & Package
Package: Power MSOP-8 (8-lead thermally enhanced variant with exposed paddle). Pin 1 = IN, Pins 2–4 = GND (internally tied to paddle), Pin 5 = EN, Pin 6 = IN, Pin 7 = BAT, Pin 8 = FB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1 & 6) | Supply input | Dual IN pins reduce trace resistance and improve thermal path; accepts 2.5–16 V unregulated or regulated source. |
| GND (Pins 2–4) | Ground return | All four GND pins and exposed paddle are internally connected - mandatory soldering to large PCB ground plane for thermal management. |
| EN | Enable control input | TTL/CMOS-compatible; pulls low to enter shutdown mode with <3 µA quiescent current. |
| BAT | Battery output | Direct connection to Li-ion cell anode; delivers up to 500 mA with 4.2 V ±0.75% regulation. |
| FB | Feedback node | Allows external voltage injection to modulate output - enables PWM-based pulse charging and end-of-charge detection circuits. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.75% battery voltage accuracy | Guaranteed over –5°C to +60°C Li-ion charging range - maximizes usable battery capacity without overvoltage stress. |
| Zero off-mode current | ≤3 µA shutdown current - eliminates parasitic drain during storage or system sleep modes. |
| 380 mV dropout at 500 mA | Enables use with low-cost unregulated wall adapters having 4.4–4.6 V no-load output - reduces BOM cost and complexity. |
| Pulse charging capability | FB pin accepts external PWM signal to cycle output - lowers average power dissipation and die temperature during top-off phase. |
| Integrated protection | Current limit (750–1000 mA) and thermal shutdown (+125°C) - eliminates need for discrete protection components in space-constrained designs. |
Applications
| Smartphone Battery Charging | Wearable Health Monitor |
|---|---|
Use Scenario: Charging single-cell Li-ion in compact smartphone with unregulated 5 V wall adapter. IC Role / Device Role / Timing Role: Linear charger IC providing constant-voltage termination at 4.2 V with ±0.75% accuracy and 380 mV dropout headroom. Use Value: Eliminates need for external current-sense resistors or microcontroller-based charge control - reduces component count and layout area. | Use Scenario: Recharging coin-cell-sized Li-ion in wrist-worn ECG monitor with strict thermal limits. IC Role / Device Role / Timing Role: Precision 4.2 V charger with pulse-mode capability via FB pin to limit average power dissipation. Use Value: Maintains battery health and user safety by avoiding >+125°C die temperature - critical for skin-contact wearable devices. |
| Industrial Handheld Scanner | Bluetooth Headset Battery Pack |
Use Scenario: Field-deployed barcode scanner using ruggedized Li-ion pack with intermittent charging cycles. IC Role / Device Role / Timing Role: Charger IC with reverse leakage <10 µA and thermal shutdown - prevents battery drain during long idle periods and protects against ambient overheating. Use Value: Extends field service life between charges and ensures reliability in hot warehouse environments. | Use Scenario: Self-contained rechargeable battery module for wireless headset with integrated LED status indication. IC Role / Device Role / Timing Role: Fixed 4.2 V charger with EN pin controlled by system MCU to enable/disable charging based on battery state and usage pattern. Use Value: Enables intelligent charge scheduling - e.g., disabling charging during audio playback to avoid noise coupling or thermal interference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion linear charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC79050-4.2YMM | Same silicon, identical electrical specs; differs only in tape-and-reel packaging (YMM vs BMM) and moisture sensitivity level (MSL 3 vs MSL 1). | No functional difference - both support EN/FB and use Power MSOP-8 package. | Select MIC79050-4.2BMM-TR for standard production volumes requiring MSL 1 handling; choose YMM for automated assembly with extended floor life. |
| TPS65023BRSBR | Multi-rail PMIC with integrated 4.2 V Li-ion charger (±0.5% accuracy), but requires external current sense and has higher quiescent current (25 µA vs 0.05 µA shutdown). | Targets systems needing multiple supply rails (core, I/O, LDOs); not a drop-in replacement due to different pinout and configuration interface. | Choose only if additional power rails are required; MIC79050-4.2BMM-TR remains superior for dedicated single-cell charging simplicity and ultra-low shutdown current. |
Compared with MIC79050-4.2YMM, the BMM-TR offers identical performance with tighter moisture sensitivity control; versus TPS65023BRSBR, it delivers lower BOM count, simpler layout, and 6× lower shutdown current - making it optimal for cost-sensitive, space-constrained, or battery-life-critical Li-ion chargers.
Availability
MIC79050-4.2BMM-TR is available at Aetrix Electronics and suitable for smartphone battery charging, wearable health monitors, industrial handheld scanners, and Bluetooth headset battery packs requiring stable component supply and long-term production continuity.
Supply support for MIC79050-4.2BMM-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
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with broad industrial and automotive qualification coverage.
The MIC79050 product line delivers highly accurate, thermally robust linear Li-ion chargers optimized for cost-sensitive portable electronics where minimal external components and guaranteed termination precision are essential.
FAQ
What is the maximum continuous output current of the MIC79050-4.2BMM-TR?
The MIC79050-4.2BMM-TR is rated for 500 mA continuous output current at 4.2 V with ≤380 mV dropout. Under short-circuit or overload conditions, its current-limit circuit activates at 750–1000 mA, preventing damage. Sustained operation near 500 mA requires adequate PCB copper area per Microchip's thermal guidelines to maintain junction temperature below +125°C.
Does the MIC79050-4.2BMM-TR require external components for basic charging operation?
Yes - the MIC79050-4.2BMM-TR requires at minimum a 4.7 µF output capacitor on the BAT pin for stability. For unregulated input sources, no additional current-setting components are needed; the wall adapter's natural impedance provides constant-current behavior. An input capacitor (≥1 µF) is recommended for noise suppression, and the EN and FB pins may be left floating or tied appropriately depending on system control requirements.
How does the MIC79050-4.2BMM-TR handle reverse battery or input disconnection?
When the IN pin is disconnected or grounded, the MIC79050-4.2BMM-TR limits reverse current from BAT to IN to <12 µA, minimizing Li-ion self-discharge. This reverse-leakage protection is inherent to the internal PNP pass transistor structure and requires no external diodes or MOSFETs - preserving board space and efficiency in battery-powered systems.
Can the MIC79050-4.2BMM-TR be used with a regulated 5 V supply?
Yes - the MIC79050-4.2BMM-TR operates from +2.5 V to +16 V input, making it fully compatible with regulated 5 V sources. In this configuration, external current limiting (e.g., sense resistor + op-amp) is required to implement constant-current charging before voltage regulation. Figure 5-10 in the datasheet shows a complete constant-current/constant-voltage solution using the MIC7300 and LM4041.
What is the purpose of the FB pin on the MIC79050-4.2BMM-TR?
The FB pin on the MIC79050-4.2BMM-TR provides access to the internal error amplifier's feedback node. It enables external control of the regulation loop - for example, pulling FB low disables output, holding it high forces saturation, and applying PWM modulates average output to implement pulse charging. This flexibility allows advanced charge termination schemes without adding a microcontroller.
MIC79050-4.2BMM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Current - Charging:
- Constant, Pulsed
- Programmable Features:
- -
- Fault Protection:
- Over Current, Over Temperature, Reverse Battery, Reverse Current
- Charge Current - Max:
- -
- 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:
- 8-MSOP
MIC79050-4.2BMM-TR FAQ
1.How can I place an order for MIC79050-4.2BMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC79050-4.2BMM-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 MIC79050-4.2BMM-TR reliable?
The price and inventory of MIC79050-4.2BMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC79050-4.2BMM-TR is usually 5 days.
3.What payment methods are accepted for MIC79050-4.2BMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC79050-4.2BMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC79050-4.2BMM-TR?
MIC79050-4.2BMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC79050-4.2BMM-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 MIC79050-4.2BMM-TR?
For technical support, including MIC79050-4.2BMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC79050-4.2BMM-TR requirements.
6.How does Aetrix verify that MIC79050-4.2BMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC79050-4.2BMM-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 MIC79050-4.2BMM-TR meets industry standards.
7.What is the process for return or replacement of MIC79050-4.2BMM-TR?
All MIC79050-4.2BMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC79050-4.2BMM-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 MIC79050-4.2BMM-TR part is unused and in its original packaging.
Return procedure for MIC79050-4.2BMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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