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Microchip Technology MIC79110BML-TR
- Part No.:
- MIC79110BML-TR
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 10-VFDFN Exposed Pad, 10-MLF®
- Datasheet:
-
MIC79110BML-TR.pdf
- Description:
- IC BATT CHG LI-ION ADJ 10MLF
- Quantity:
- Payment:
- Shipping:
Inventory:1,399
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Product details
Overview
MIC79110BML-TR from Micrel is a monolithic linear lithium-ion battery charger IC with integrated pass transistor, ±5% programmable current limit (up to 1.2A), ±0.75% output voltage accuracy over –5°C to +60°C, and dual end-of-charge indicators-digital open-drain DEOC and analog ACHG proportional to battery current-for real-time monitoring in portable power systems.
For engineers reviewing the MIC79110BML-TR datasheet, MIC79110BML-TR pinout, MIC79110BML-TR application, or MIC79110BML-TR equivalent, this device supports precise constant-current/constant-voltage charging of single-cell Li-ion batteries in space-constrained consumer electronics where thermal management, reverse-polarity protection, and low-dropout operation (550mV at 700mA) are critical.
Technical Context
The MIC79110BML-TR implements a linear regulation architecture with internal N-channel pass transistor, enabling direct control of charge current via RSET and end-of-charge threshold via REOC. Its fixed 4.2V output version (denoted by "-4.2" in ordering code) eliminates external feedback resistors while maintaining ±0.75% voltage accuracy across temperature.
It features two independent status outputs: DEOC provides logic-level end-of-charge signaling using an N-channel open-drain structure with 150–190Ω on-resistance, while ACHG delivers a 1/1000-scaled current source for analog current monitoring. Shutdown input (SD) offers active-low enable with 60mV hysteresis and <5µA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Current Range | 0.1A to 1.2A, set externally via RSET resistor; enables flexible battery capacity matching without redesign. |
| Output Voltage Accuracy | ±0.75% over –5°C to +60°C for 4.2V fixed output; ensures cell longevity and compliance with standard Li-ion chemistry requirements. |
| Dropout Voltage | 550mV at 700mA load over full temperature range; allows operation from low-input sources like USB or 5V wall adapters. |
| End-of-Charge Threshold | Programmable down to 30mA via REOC resistor; supports 10% C-rate termination for safe full-charge completion. |
| Junction Temperature Range | –40°C to +125°C; qualified for industrial and automotive accessory environments with no derating up to 125°C. |
| Package Thermal Resistance | θJA = 60°C/W (3mm × 3mm DFN); enables >700mA continuous operation without forced airflow in typical PCB layouts. |
Pinout & Package
Available in a leadless 10-pin 3mm × 3mm DFN package (ML suffix), thermally enhanced with exposed pad for improved heat dissipation and compact footprint ideal for handheld devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SD | Shutdown Input | Active-low logic control; <0.93V enables charging, >1.05V disables with 60mV hysteresis to prevent chatter during brownout. |
| 2 RSET | Current Limit Set | Resistor-to-ground sets charge current: IRSET = (0.2V / RSET) × 1000; 167Ω yields 1.2A max. |
| 3 SNS | Battery Sense | Direct connection to battery anode; enables accurate voltage regulation independent of PCB trace resistance. |
| 4 BAT | Battery Terminal | Main output node delivering regulated 4.2V; includes reverse-current protection limiting leakage to <20µA when VIN is absent. |
| 5,6 VIN | Input Supply | Dual pins reduce IR drop and improve thermal distribution; accepts 2.5V–16V input, including unregulated wall adapters. |
| 7 ACHG | Analog Charge Indicator | Current source outputting IBAT/1000; enables real-time current monitoring with simple RC filter and ADC. |
| 8 DEOC | Digital End-of-Charge | N-channel open-drain output; pulls low during charge, goes high-impedance at termination-requires external pull-up. |
| 9 REOC | End-of-Charge Threshold | Resistor-to-ground sets IEOC = (0.2V / REOC) × 1000; 4kΩ sets 50mA cutoff for 500mAh cells. |
| 10 GND | Ground Reference | Common return for all internal circuits and external components; must be low-impedance connection to thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Pass Transistor | Eliminates external MOSFET and associated gate-drive complexity; reduces BOM count and layout area in compact chargers. |
| Two Independent Status Outputs | DEOC (digital flag) and ACHG (analog monitor) provide simultaneous system-level visibility into charge state and current magnitude. |
| Reverse Polarity & Reverse-Current Protection | Prevents >10µA reverse battery discharge when VIN is disconnected or reversed-no external diodes required. |
| Thermal Shutdown with Hysteresis | Internally limits junction temperature to +125°C and holds shutdown until cooldown to ~115°C, preventing thermal cycling. |
| Low Dropout Operation | 550mV dropout at 700mA ensures usable headroom from 5V inputs-even under worst-case temperature conditions. |
Applications
| Cellular Phones | Digital Cameras |
|---|---|
Use Scenario: Integrated charging circuit in slim smartphone designs with single-cell Li-ion battery and limited PCB area. IC Role / Device Role / Timing Role: Linear charger IC providing CC/CV regulation, end-of-charge detection, and current monitoring for battery management subsystem. Use Value: Enables compact, thermally robust charging solution with no external pass FET or discrete sense resistors-reducing component count by ≥4 parts. |
Use Scenario: Power management in high-resolution digital cameras requiring fast, reliable top-off charging between bursts of image capture. IC Role / Device Role / Timing Role: Primary Li-ion charger IC delivering precise 4.2V termination and analog current feedback for firmware-controlled charge profiling. Use Value: ±0.75% voltage accuracy extends cycle life beyond 500 cycles; ACHG output allows real-time charge rate adaptation during burst-mode operation. |
| Notebook PC Cradles | Portable Meters |
Use Scenario: Docking station or car cradle supplying regulated 4.2V to replaceable Li-ion battery packs in ultraportable notebooks. IC Role / Device Role / Timing Role: Standalone linear charger IC managing full charge cycle-including auto-restart on voltage sag-without host processor intervention. Use Value: Built-in auto top-off functionality (via SD pin resistor divider) maintains battery at optimal 4.0–4.1V storage voltage without firmware overhead. |
Use Scenario: Battery-powered handheld test equipment requiring long runtime, field-replaceable cells, and accurate charge status reporting. IC Role / Device Role / Timing Role: Embedded charger IC providing analog current readback (ACHG) and digital EOC flag to MCU for battery health diagnostics. Use Value: 1/1000 current scaling enables µA-level current measurement with standard 12-bit ADCs-supporting <1% SoC estimation error. |
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 |
|---|---|---|---|
| TPS65023BRSBT | Multi-rail PMIC with integrated 4.2V Li-ion charger (1A), LDOs, and DC/DC converters; larger 5×5mm QFN package. | Requires system-level power integration; not suitable for standalone charger-only use cases. | Select when additional voltage rails and sequencing are needed alongside charging. |
| BQ24075RGTR | TI 1.2A Li-ion charger with USB-compatible input current limit, thermal regulation, and I²C interface; same 3×3mm QFN footprint but different pinout. | Lacks analog current monitor (ACHG) and requires firmware control for end-of-charge behavior. | Select when USB compliance, programmability, or thermal foldback are prioritized over analog monitoring simplicity. |
Compared with TPS65023BRSBT and BQ24075RGTR, the MIC79110BML-TR delivers dedicated linear charging with minimal external components, true analog current monitoring, and fixed-output simplicity-making it optimal for cost-sensitive, space-constrained, and firmware-light embedded battery systems.
Availability
MIC79110BML-TR is available at Aetrix Electronics and suitable for cellular phones, digital cameras, notebook PC cradles, and portable meters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MIC79110BML-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 founded in 1978 and acquired by Microchip Technology in 2015; known for precision power management, timing, and interface ICs.
The MIC79110BML-TR belongs to Micrel's linear battery charger product line, designed specifically for compact, high-accuracy single-cell Li-ion charging in consumer and industrial portable electronics without microcontroller dependency.
FAQ
What is the maximum charge current supported by the MIC79110BML-TR?
The MIC79110BML-TR supports a maximum charge current of 1.2A, achieved by connecting a 167Ω resistor from RSET pin to ground. This value is specified across the full operating temperature range (–40°C to +125°C) with ±5% accuracy. Higher currents up to 1.65A are possible under short-duration conditions but exceed recommended continuous operation limits.
Does the MIC79110BML-TR require external components to set its 4.2V output?
No, the MIC79110BML-TR is the fixed 4.2V output variant and does not require external feedback resistors. Its output voltage is trimmed at wafer test to ±0.75% over –5°C to +60°C, eliminating calibration components and simplifying layout. Only RSET, REOC, and optional SD divider resistors are needed for full functionality.
How does the MIC79110BML-TR handle reverse battery connection?
The MIC79110BML-TR includes built-in reverse polarity protection that limits reverse battery current to less than 10µA over temperature when VBAT > VIN and SD is low. This feature prevents damage to the IC and battery without requiring external diodes or MOSFETs-reducing BOM cost and board space.
Can the MIC79110BML-TR be used for automatic top-off charging?
Yes, the MIC79110BML-TR supports auto top-off via its SD pin: a resistor divider from BAT to GND applies a voltage to SD that drops below 0.93V when battery voltage falls below ~3.72V, re-enabling charging. When DEOC goes high-impedance at termination, the SD voltage rises above 1.05V and disables the part-enabling fully autonomous maintenance charging.
What thermal protection mechanisms are implemented in the MIC79110BML-TR?
The MIC79110BML-TR integrates thermal shutdown that activates at +125°C junction temperature and remains latched until temperature falls to approximately +115°C due to built-in hysteresis. This prevents destructive thermal cycling and ensures safe operation under sustained high-load or poor heatsinking conditions without external thermal sensors.
MIC79110BML-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:
- -
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- Over Current, Over Temperature, Reverse Current
- Charge Current - Max:
- 1.2A
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 16V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MLF® (3x3)
MIC79110BML-TR FAQ
1.How can I place an order for MIC79110BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC79110BML-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 MIC79110BML-TR reliable?
The price and inventory of MIC79110BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC79110BML-TR is usually 5 days.
3.What payment methods are accepted for MIC79110BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC79110BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC79110BML-TR?
MIC79110BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC79110BML-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 MIC79110BML-TR?
For technical support, including MIC79110BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC79110BML-TR requirements.
6.How does Aetrix verify that MIC79110BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC79110BML-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 MIC79110BML-TR meets industry standards.
7.What is the process for return or replacement of MIC79110BML-TR?
All MIC79110BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC79110BML-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 MIC79110BML-TR part is unused and in its original packaging.
Return procedure for MIC79110BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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