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Microchip Technology MCP73844-820I/MS
- Part No.:
- MCP73844-820I/MS
- Manufacturer:
- Microchip Technology
- Category:
- Battery Chargers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MCP73844-820I/MS.pdf
- Description:
- IC BATT CNTL LI-ION 1-2CEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:322
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Product details
Overview
MCP73844-820I/MS from Microchip Technology is a linear lithium-ion/polymer battery charge management controller designed for dual-series-cell packs. It delivers 8.2V regulated output voltage with ±0.5% accuracy, supports programmable fast-charge current via external sense resistor, integrates safety timers (preconditioning, fast-charge, elapsed-time), and operates from 8.7V to 12V input supply. It is used in portable medical devices requiring precise dual-cell charging with thermal qualification.
For engineers reviewing the MCP73844-820I/MS datasheet, MCP73844-820I/MS pinout, MCP73844-820I/MS application, or MCP73844-820I/MS equivalent, key selection criteria include its 8.2V fixed regulation, MSOP-8 package, absence of integrated thermistor monitoring, and compatibility with external P-channel MOSFETs for high-efficiency linear regulation.
Technical Context
The MCP73844-820I/MS implements a three-phase charge algorithm: preconditioning (trickle-charge below 5.6V), constant-current fast-charge (regulated by VFCS = 110 mV across RSENSE), and constant-voltage regulation at 8.2V. It uses an internal precision reference (1.2V) and error amplifiers to control external P-MOSFET gate drive (DRV) for voltage/current regulation.
Unlike MCP73841/42 variants, it omits THREF and THERM pins - eliminating continuous cell temperature monitoring. Its enable logic (EN) supports manual charge initiation/termination, and STAT1 provides open-drain status indication with fault flashing (1 Hz) on timer expiry or qualification failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage | 8.2V ±0.5% - precisely targets dual Li-ion series pack termination without software calibration |
| Input Voltage Range | 8.7V to 12V - requires ≥8.7V supply to exit UVLO and initiate charge for 8.2V battery |
| Fast-Charge Threshold | 110 mV (VFCS) - sets IREG = 110 mV / RSENSE; e.g., 500 mA with 220 mΩ resistor |
| Precondition Threshold | 5.6V (typical VPTH) - triggers safe trickle-charge for deeply depleted dual-cell packs |
| Safety Timer Basis | CTIMER = 0.1 µF - yields 60 min precondition, 1.5 hr fast-charge, and 3.0 hr elapsed termination |
| Operating Temp | -40°C to +85°C - fully specified for industrial portable equipment environments |
| Supply Current (Op) | ≤0.75 mA - low quiescent draw enables efficient operation in battery-backed systems |
Pinout & Package
Package: MSOP-8 (3.0 mm × 3.0 mm, 0.65 mm pitch), RoHS-compliant, thermal resistance θJA = 206°C/W on single-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SENSE | Current sense input | Voltage drop (VFCS) across external RSENSE sets fast-charge current; 110 mV nominal |
| 2 VDD | Input power supply | 8.7–12V supply input; powers IC and enables UVLO detection (VSTART = 8.65V) |
| 3 STAT1 | Status output | Open-drain, current-limited; sinks up to 12 mA; indicates charge state or faults via ON/OFF/flash |
| 4 EN | Enable control | Logic-high (>1.4V) enables charge; logic-low (<0.8V) forces termination and reduces ISS to 0.25 µA |
| 5 TIMER | Timer capacitor connection | Connects to CTIMER (e.g., 0.1 µF) to scale all safety timers proportionally |
| 6 VSS | Ground reference | Battery negative terminal return; must be low-impedance path for sense and regulation stability |
| 7 VBAT | Battery voltage sense | Direct connection to battery positive; internal divider regulates to 8.2V with ±0.5% accuracy |
| 8 DRV | MOSFET gate driver | Drives external P-channel MOSFET gate; sinks 2 mA in CV mode; clamped to -4.5V (VGS) |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 8.2V regulation | Enables direct use with dual Li-ion series packs without external feedback resistors or DACs |
| Programmable fast-charge current | Set via RSENSE (e.g., 220 mΩ → 500 mA); eliminates need for current-setting DAC or digital interface |
| Three independent safety timers | Precondition (60 min), fast-charge (1.5 hr), and elapsed-time (3.0 hr) prevent overcharge under fault conditions |
| Automatic preconditioning | Activates trickle-charge below 5.6V to safely recover deeply discharged dual-cell batteries |
| Open-drain STAT1 with fault signaling | Direct LED drive capability plus microcontroller-compatible pull-up; flashing indicates timer expiry or qualification failure |
Applications
| Portable Medical Monitors | Industrial Handheld Scanners |
|---|---|
Use Scenario: Battery-powered ECG or pulse oximeter with dual-cell Li-ion pack requiring reliable, certified charge control in field-deployed units. IC Role / Device Role / Timing Role: Standalone linear charger managing CC/CV profile, UVLO, and safety timers - no host MCU required. Use Value: ±0.5% voltage accuracy ensures cell longevity; 8.2V regulation matches dual-cell graphite-anode chemistry; MSOP-8 footprint saves PCB area in compact enclosures. | Use Scenario: Rugged barcode scanner used in warehouse logistics, operating 8–12 hours per charge with hot-swap battery support. IC Role / Device Role / Timing Role: Primary charge controller interfacing with external P-MOSFET and status LED; EN pin enables host-triggered recharge. Use Value: Low 0.25 µA sleep current preserves battery during storage; robust -40°C to +85°C rating supports cold-chain and outdoor deployment. |
| Emergency Communication Radios | Mobile Test Equipment |
Use Scenario: Tactical two-way radio with swappable dual-cell Li-ion battery, requiring fail-safe charging under variable input (e.g., vehicle USB or wall adapter). IC Role / Device Role / Timing Role: Linear charge manager providing automatic preconditioning, CC/CV regulation, and end-of-charge termination without firmware. Use Value: 8.7V minimum input allows operation from 9V vehicle adapters; UVLO hysteresis prevents oscillation during brownout; STAT1 flash alerts users to timer faults. | Use Scenario: Portable oscilloscope or multimeter with dual-cell battery, needing accurate full-charge reporting and minimal BOM count. IC Role / Device Role / Timing Role: Integrated charge controller handling voltage regulation, current sensing, and status indication - replaces discrete op-amp + comparator solutions. Use Value: Eliminates external voltage reference and timing components; 8-pin MSOP reduces layout complexity versus 10-pin alternatives like MCP73842. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear battery charge management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP73842-820I/MS | 10-pin MSOP; includes THREF and THERM pins for thermistor-based temperature monitoring | Required where JEDEC JESD-22-A104 or IEC 62133 thermal qualification mandates continuous cell temp supervision | Select MCP73842-820I/MS only if NTC/PTC thermistor integration is mandatory; otherwise MCP73844-820I/MS offers smaller footprint and lower cost |
| BQ24075RGTR | TI part; 5V-input-only; integrates N-channel MOSFET; no programmable timers; 4.2V output only | Not suitable for 8.2V dual-cell or >8.7V input applications; lacks preconditioning and multi-timer safety architecture | MCP73844-820I/MS is preferred for dual-cell, wide-input, and safety-critical designs; BQ24075RGTR fits low-cost single-cell consumer applications |
Compared with MCP73842-820I/MS, the MCP73844-820I/MS saves board space and cost by omitting temperature sensing, while retaining identical 8.2V regulation, timer architecture, and MOSFET drive capability. Against BQ24075RGTR, it supports higher input voltage, dual-cell topology, and comprehensive safety timers - making it suitable for industrial and medical-grade charging.
Availability
MCP73844-820I/MS is available at Aetrix Electronics and suitable for portable medical monitors, industrial handheld scanners, and emergency communication radios requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MCP73844-820I/MS 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 Inc. is a leading provider of microcontrollers, analog, and Flash-IP solutions, serving automotive, industrial, communications, and consumer markets with high-reliability silicon and development tools.
The MCP7384X product line was designed specifically for cost-sensitive, space-constrained linear battery charging in portable electronics - delivering integrated CC/CV control, safety timers, and status signaling without host processor dependency.
FAQ
What is the exact regulated output voltage of the MCP73844-820I/MS?
The MCP73844-820I/MS provides a fixed regulated output voltage of 8.2V with a maximum tolerance of ±0.5% (8.159V to 8.241V) across -5°C to +55°C ambient temperature and 10 mA load. This value is factory-trimmed and does not require external feedback components.
Does the MCP73844-820I/MS support temperature monitoring for battery safety?
No, the MCP73844-820I/MS does not support temperature monitoring. It lacks THREF and THERM pins present in MCP73841/42 variants. Temperature qualification is omitted to reduce package size and cost; thermal protection must be implemented externally if required.
What is the minimum input supply voltage required to operate the MCP73844-820I/MS?
The MCP73844-820I/MS requires a minimum input supply voltage of 8.7V to exceed its undervoltage lockout start threshold (VSTART = 8.65V typical). Operation below this level disables charging and places the device in ultra-low-power sleep mode (ISS ≤ 0.25 µA).
How is the fast-charge current programmed on the MCP73844-820I/MS?
The fast-charge current is programmed using an external sense resistor (RSENSE) between VDD and the external P-MOSFET source. The MCP73844-820I/MS regulates VFCS = VDD − VSENSE to 110 mV (typical), so IREG = 0.11 V / RSENSE. For example, a 220 mΩ resistor sets IREG ≈ 500 mA.
What does the STAT1 pin indicate during normal operation of the MCP73844-820I/MS?
During normal operation, STAT1 is actively pulled low (ON) during preconditioning, constant-current, and constant-voltage charge phases. It goes high-impedance (OFF) when charging completes or the device is disabled. A 1 Hz flashing pattern indicates safety timer expiry or qualification failure (e.g., UVLO or EN low).
MCP73844-820I/MS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1 ~ 2
- Current - Charging:
- -
- Programmable Features:
- Timer
- Fault Protection:
- -
- Charge Current - Max:
- -
- Battery Pack Voltage:
- 8.2V
- Voltage - Supply (Max):
- 12V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MCP73844-820I/MS FAQ
1.How can I place an order for MCP73844-820I/MS through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP73844-820I/MS 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 MCP73844-820I/MS reliable?
The price and inventory of MCP73844-820I/MS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73844-820I/MS is usually 5 days.
3.What payment methods are accepted for MCP73844-820I/MS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73844-820I/MS transactions.
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4.How is shipping managed for MCP73844-820I/MS?
MCP73844-820I/MS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP73844-820I/MS 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 MCP73844-820I/MS?
For technical support, including MCP73844-820I/MS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73844-820I/MS requirements.
6.How does Aetrix verify that MCP73844-820I/MS is sourced from the original manufacturer or authorized distributors?
All MCP73844-820I/MS 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 MCP73844-820I/MS meets industry standards.
7.What is the process for return or replacement of MCP73844-820I/MS?
All MCP73844-820I/MS units undergo pre-shipment inspection (PSI). If there is an issue with MCP73844-820I/MS, 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 MCP73844-820I/MS part is unused and in its original packaging.
Return procedure for MCP73844-820I/MS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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