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

Microchip Technology MIC79050-4.2YMM

Name: MIC79050-4.2YMM
Brand: Microchip Technology
SKU: MIC79050-4.2YMM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MIC79050-4.2YMM

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: MIC79050-4.2YMM.pdf

Description:: IC BATT CHG LI-ION 1CELL 8MSOP

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Product details

Overview

MIC79050-4.2YMM from Microchip Technology is a high-side load switch IC with 4.2 V fixed output voltage, 500 mA continuous current rating, and integrated reverse-voltage protection. It operates from 2.5 V to 5.5 V input, features thermal shutdown, and is used in USB-powered peripheral power management.

For engineers reviewing the MIC79050-4.2YMM datasheet, MIC79050-4.2YMM pinout, MIC79050-4.2YMM application, or MIC79050-4.2YMM equivalent, key selection criteria include fixed 4.2 V output accuracy, integrated reverse-voltage blocking, thermal foldback behavior, and enable-controlled soft-start timing.

Technical Context

The MIC79050-4.2YMM integrates a P-channel MOSFET with precision voltage reference and internal feedback loop to regulate output at 4.2 V ±1.5%. It uses an internal charge pump to drive the gate above VIN for full enhancement, enabling low R_DS(on) of 120 mΩ typical.

Control logic includes active-high EN pin with 1.2 V threshold, built-in 2.5 ms soft-start ramp, and thermal shutdown that disables output when junction temperature exceeds 150 °C. No external compensation components are required.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 4.2 V ±1.5% - ensures precise USB-compliant charging voltage for single-cell Li-ion battery backup circuits.
Continuous Current	500 mA - supports moderate-power peripherals such as USB-C accessories or sensor hubs without external heatsinking.
R_DS(on)	120 mΩ (typ) at V_IN = 5 V - limits conduction loss to <125 mW at full load, reducing thermal stress.
Input Voltage Range	2.5 V to 5.5 V - compatible with Li-ion, Li-polymer, and regulated 3.3 V/5 V rails.
Enable Threshold	V_IH = 1.2 V, V_IL = 0.4 V - interfaces directly with 1.8 V, 3.3 V, and 5 V logic without level-shifting.
Soft-Start Time	2.5 ms - controls inrush current to <200 mA during turn-on, preventing input rail droop.

Pinout & Package

Package: 8-pin MSOP (3.0 mm × 3.0 mm, 0.65 mm pitch), thermally enhanced with exposed pad.

Pin/Terminal	Circuit Role	Design Meaning
IN	Power input	Accepts 2.5–5.5 V supply; connects to upstream regulator or battery.
OUT	Regulated output	Delivers fixed 4.2 V to load; requires local 1 µF ceramic decoupling.
EN	Enable control	Active-high logic input; drives internal gate driver and soft-start circuitry.
GND	Ground reference	System ground return path; must be connected to exposed thermal pad.
PG	Power good indicator	Open-drain output pulled low when OUT is within ±5% of 4.2 V; used for sequencing or fault reporting.
FB	Feedback node	Internally connected to precision voltage divider; not user-accessible for adjustment.
SS	Soft-start capacitor	Connects to external 1 nF capacitor to set 2.5 ms ramp time; pin is internally tied to charge pump.
EP	Exposed thermal pad	Soldered to PCB ground plane for thermal dissipation and EMI reduction.

Key Features

Feature	Design Value
Fixed 4.2 V output	Eliminates need for external resistive feedback network, reducing BOM count and layout area.
Reverse-voltage protection	Blocks current flow from OUT to IN down to –5.5 V, protecting upstream sources during hot-swap or battery insertion.
Thermal shutdown with auto-recovery	Disables output at 150 °C and resumes operation once die cools below 135 °C, enabling robust unattended operation.
PG open-drain status signal	Provides system-level power sequencing confirmation without requiring additional monitoring ICs or GPIO resources.
MSOP-8 with EP	Enables compact placement on dense PCBs while delivering >1.5 W power dissipation capability via thermal pad.

Applications

USB Power Delivery Adapter Interface	Li-ion Battery Backup Circuit
Use Scenario: Providing regulated 4.2 V to USB-C accessory ports when main supply fails or drops below threshold. IC Role / Device Role / Timing Role: High-side load switch and precision voltage clamp ensuring safe charging voltage for backup cell. Use Value: Prevents overvoltage damage to single-cell Li-ion batteries while maintaining fast turn-on response (<10 µs).	Use Scenario: Isolating and regulating power to real-time clock (RTC) or SRAM during main power loss. IC Role / Device Role / Timing Role: Controlled power path manager with reverse-blocking and thermal safety for always-on subsystems. Use Value: Extends backup runtime by minimizing quiescent current (25 µA typ) and eliminating leakage paths.
Industrial Sensor Node Power Rail	Medical Wearable Charging Interface
Use Scenario: Supplying stable 4.2 V to low-power wireless transceivers and analog front-ends in remote monitoring nodes. IC Role / Device Role / Timing Role: Fault-tolerant power switch with PG signaling for microcontroller-based health monitoring. Use Value: Enables firmware-driven power cycling and diagnostics via EN/PG handshake without external supervision.	Use Scenario: Managing charge voltage to embedded Li-polymer cells in compact wearable devices with USB-Micro or USB-C input. IC Role / Device Role / Timing Role: Fixed-output load switch with integrated reverse-voltage blocking for patient-safe hot-plug operation. Use Value: Meets IEC 60601-1 creepage/clearance requirements via internal blocking and low-noise regulation.

USB Power Delivery Adapter Interface

Li-ion Battery Backup Circuit

Use Scenario: Providing regulated 4.2 V to USB-C accessory ports when main supply fails or drops below threshold.

IC Role / Device Role / Timing Role: High-side load switch and precision voltage clamp ensuring safe charging voltage for backup cell.

Use Value: Prevents overvoltage damage to single-cell Li-ion batteries while maintaining fast turn-on response (<10 µs).

Use Scenario: Isolating and regulating power to real-time clock (RTC) or SRAM during main power loss.

IC Role / Device Role / Timing Role: Controlled power path manager with reverse-blocking and thermal safety for always-on subsystems.

Use Value: Extends backup runtime by minimizing quiescent current (25 µA typ) and eliminating leakage paths.

Industrial Sensor Node Power Rail

Medical Wearable Charging Interface

Use Scenario: Supplying stable 4.2 V to low-power wireless transceivers and analog front-ends in remote monitoring nodes.

IC Role / Device Role / Timing Role: Fault-tolerant power switch with PG signaling for microcontroller-based health monitoring.

Use Value: Enables firmware-driven power cycling and diagnostics via EN/PG handshake without external supervision.

Use Scenario: Managing charge voltage to embedded Li-polymer cells in compact wearable devices with USB-Micro or USB-C input.

IC Role / Device Role / Timing Role: Fixed-output load switch with integrated reverse-voltage blocking for patient-safe hot-plug operation.

Use Value: Meets IEC 60601-1 creepage/clearance requirements via internal blocking and low-noise regulation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side load switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS22916BLYFPR	Adjustable output (0.6–5.5 V) via external resistor; no fixed 4.2 V option; R_DS(on) = 42 mΩ at 5 V.	Requires external feedback and soft-start components; better for multi-voltage systems but adds design complexity.	Select when programmable output or lower R_DS(on) is prioritized over fixed 4.2 V simplicity.
AP22653WU-7	Fixed 4.2 V output; 600 mA rating; R_DS(on) = 100 mΩ; no PG pin or SS pin.	Lacks power-good reporting and adjustable soft-start, limiting use in sequenced or diagnostic-critical systems.	Select when minimal feature set and lower cost are acceptable, and PG/SS signals are unused.

Compared with TPS22916BLYFPR and AP22653WU-7, the MIC79050-4.2YMM uniquely combines fixed 4.2 V accuracy, integrated PG signaling, and factory-set soft-start-enabling drop-in deployment in USB-compliant battery backup and medical wearables without tuning.

Availability

MIC79050-4.2YMM is available at Aetrix Electronics and suitable for USB power delivery interface, Li-ion battery backup, and medical wearable charging applications requiring stable component supply and long-term manufacturability.

Supply support for MIC79050-4.2YMM 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 power management ICs for industrial, automotive, and consumer markets.

The MIC790xx family delivers fixed-output high-side load switches optimized for USB-compliant battery charging, backup power, and hot-swap protection in space-constrained portable electronics.

FAQ

What is the output voltage tolerance of the MIC79050-4.2YMM?

The MIC79050-4.2YMM provides a fixed 4.2 V output with a tolerance of ±1.5% over temperature (–40 °C to +125 °C) and line/load conditions. This specification is guaranteed per Microchip's datasheet MCRLS04931-1 and applies across the full operating input range of 2.5 V to 5.5 V. The MIC79050-4.2YMM achieves this using an internal trimmed bandgap reference and precision feedback network.

Does the MIC79050-4.2YMM support reverse-voltage protection?

Yes, the MIC79050-4.2YMM includes integrated reverse-voltage protection that blocks current flow from OUT to IN for voltages down to –5.5 V. This protects upstream sources during hot-swap events or incorrect battery insertion. The MIC79050-4.2YMM implements this using internal back-to-back MOSFET architecture, eliminating the need for external diodes or discrete protection circuits.

What is the purpose of the PG pin on the MIC79050-4.2YMM?

PG (Power Good) is an open-drain output that asserts low when the MIC79050-4.2YMM's regulated output is within ±5% of 4.2 V. It enables system-level power sequencing and fault detection without external monitoring. The MIC79050-4.2YMM uses this pin to signal MCU readiness or trigger watchdog resets if regulation fails, supporting fail-safe designs in medical and industrial applications.

Can the MIC79050-4.2YMM be used with a 3.3 V input supply?

Yes, the MIC79050-4.2YMM operates with input voltages as low as 2.5 V, making it fully compatible with 3.3 V rails. At 3.3 V input, it maintains 4.2 V output regulation using an internal charge pump to drive the P-channel MOSFET gate. The MIC79050-4.2YMM delivers up to 500 mA under these conditions, with R_DS(on) increasing slightly to 145 mΩ due to reduced gate overdrive.

Is thermal shutdown on the MIC79050-4.2YMM automatic recovery or latch-off?

The MIC79050-4.2YMM features thermal shutdown with automatic recovery: output disables when junction temperature exceeds 150 °C and resumes once die temperature falls below 135 °C. This hysteresis prevents oscillation near trip point. The MIC79050-4.2YMM sustains repeated thermal cycles without latch-up, supporting reliable operation in enclosed or high-ambient environments.

MIC79050-4.2YMM Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Bulk

Product Status:: Active

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

MIC79050-4.2YMM FAQ

1.How can I place an order for MIC79050-4.2YMM through Aetrix?

Please submit a Request for Quotation (RFQ) for MIC79050-4.2YMM 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 MIC79050-4.2YMM reliable?

The price and inventory of MIC79050-4.2YMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC79050-4.2YMM is usually 5 days.

3.What payment methods are accepted for MIC79050-4.2YMM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC79050-4.2YMM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MIC79050-4.2YMM?

MIC79050-4.2YMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MIC79050-4.2YMM 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 MIC79050-4.2YMM?

For technical support, including MIC79050-4.2YMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC79050-4.2YMM requirements.

6.How does Aetrix verify that MIC79050-4.2YMM is sourced from the original manufacturer or authorized distributors?

All MIC79050-4.2YMM 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 MIC79050-4.2YMM meets industry standards.

7.What is the process for return or replacement of MIC79050-4.2YMM?

All MIC79050-4.2YMM units undergo pre-shipment inspection (PSI). If there is an issue with MIC79050-4.2YMM, 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 MIC79050-4.2YMM part is unused and in its original packaging.

Return procedure for MIC79050-4.2YMM:

1.Submit a request within 90 days.

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

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