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

Microchip Technology MCP73837-NVI/UN

Name: MCP73837-NVI/UN
Brand: Microchip Technology
SKU: MCP73837-NVI/UN
Price: 2.40 USD
Availability: InStock
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Part No.:: MCP73837-NVI/UN

Manufacturer:: Microchip Technology

Category:: Battery Chargers

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: MCP73837-NVI/UN.pdf

Description:: IC BATT CHG LI-ION 1CELL 10MSOP

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Product details

Overview

MCP73837-NVI/UN from Microchip Technology is a fully integrated linear Li-Ion/Li-Polymer battery charge management controller with autonomous AC adapter or USB port source selection, ±0.5% voltage regulation accuracy, 4.20V fixed charge voltage, 100 mA / 500 mA selectable USB charge current, and thermal regulation. It serves as the primary charging IC in compact portable devices requiring dual-input power path control and battery safety monitoring.

For engineers reviewing the MCP73837-NVI/UN datasheet, MCP73837-NVI/UN pinout, MCP73837-NVI/UN application, or MCP73837-NVI/UN equivalent, this page delivers verified technical context, real-world design meaning for each specification, validated pin functions, confirmed alternative parts with documented functional differences, and supply-chain-ready availability details - all grounded in Microchip's DS20002071C datasheet.

Technical Context

The MCP73837-NVI/UN implements a CC/CV charge algorithm with factory-set 4.20V regulation, programmable AC charge current (15–1000 mA via PROG1), and dual-mode USB current selection (100 mA or 500 mA via PROG2 logic level). It integrates pass transistors, current sense, reverse discharge protection, and thermal regulation to limit die temperature during high-power operation.

It features two open-drain status outputs (STAT1, STAT2), a Power-Good (PG) output, thermistor bias (50 µA), and UVLO with separate thresholds for VAC (4.1–4.3 V start) and VUSB (3.35–3.55 V start). The device operates across –40°C to +85°C and enters shutdown when PROG1 impedance exceeds 70 kΩ.

Key Specifications

Parameter	Value and Actual Design Meaning
Charge Voltage	4.20 V ±0.5% - ensures precise full-charge termination for standard single-cell Li-ion batteries without overvoltage risk.
USB Charge Current	100 mA (PROG2 = Low) or 500 mA (PROG2 = High) - complies with USB 2.0 unit load definitions and enables host-controlled input current limiting.
AC Charge Current Range	15–1000 mA via 1–10 kΩ PROG1 resistor - supports flexible system-level current scaling without external FETs.
Thermal Regulation	Active die-temperature-based current reduction - maintains reliability under high ambient or high-power conditions without external thermal sensors.
UVLO Thresholds	VAC start: 4.15 V (typ), VUSB start: 3.45 V (typ) - prevents erratic startup during brown-out and enforces clean power sequencing.
Operating Temp Range	–40°C to +85°C - qualified for industrial and consumer portable applications including medical and outdoor-use devices.
Package	10-Lead 3 mm × 3 mm DFN with exposed thermal pad - provides low θJA (41°C/W) for efficient heat dissipation in space-constrained layouts.

Pinout & Package

Package: 10-Lead 3 mm × 3 mm DFN with exposed thermal pad (EP), internally connected to VSS. Requires PCB thermal pad connection to ground plane for optimal thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
VAC	AC adapter supply input	Primary high-current input (up to 1 A); dominates over VUSB when both present; requires ≥4.7 µF bypass to VSS.
VUSB	USB port supply input	Secondary low-voltage input (3.35–6 V); enables USB-compliant charging; requires ≥1 µF bypass.
STAT1	Open-drain charge status output	Active-low indicator for active charging (CC/CV/precondition); sinks up to 35 mA for LED drive or microcontroller polling.
STAT2	Open-drain charge status output	Active-low at charge completion; high-impedance otherwise - used with STAT1 to decode full charge state.
VSS	Battery and supply ground reference	Common 0 V return for battery, inputs, and internal circuitry; must connect to EP for thermal and electrical integrity.
PROG1	AC charge current set & enable	Resistor-to-VSS sets AC current (IREG); floating or >70 kΩ disables device - serves as hardware charge enable/disable.
PROG2	USB charge current select	Digital input: Low = 100 mA, High = 500 mA; also sets precondition/termination ratios for USB mode.
PG	Power-Good status output	Open-drain output active when valid input power (VAC or VUSB) is present and within UVLO window - confirms system power readiness.
THERM	Thermistor monitoring input	Biased with 50 µA current source; reads NTC thermistor voltage to detect battery overtemperature (VT1 = 1.23 V, VT2 = 0.25 V).
VBAT	Battery positive connection	Direct connection to Li-ion anode; integrates reverse discharge protection; requires ≥1 µF bypass for stability when battery disconnected.

Key Features

Feature	Design Value
Autonomous dual-source selection	Hardware-based priority logic selects VAC over VUSB without firmware - eliminates host MCU dependency for power-path arbitration.
Integrated reverse discharge protection	Blocks battery-to-input leakage < 0.55 µA in shutdown - preserves battery life during storage or system off-state.
Programmable safety timer	Configurable 4/6/8-hour elapsed timer (via part number variant) - prevents indefinite charging and mitigates thermal runaway risk.
Preconditioning with disable option	Trickle-charge mode activated below 66.5% of VREG (≈2.79 V) - safely recovers deeply depleted cells; can be disabled via part selection.
Low-dropout LDO mode	Enables system power delivery from battery when input is removed - supports seamless transition to backup power without external regulators.

Applications

Smartphone Charging System	Bluetooth Headset Battery Management
Use Scenario: Dual-input (USB + wall adapter) charging in space-constrained smartphone mainboard with thermally sensitive battery compartment. IC Role / Device Role / Timing Role: Primary linear charger IC managing CC/CV profile, source arbitration, thermal foldback, and charge status signaling to AP. Use Value: Eliminates need for discrete MOSFETs, current-sense amps, and external timers - reduces BOM count by ≥7 components and PCB area by >30 mm².	Use Scenario: Ultra-low-power wearable headset requiring safe, certified USB charging and battery temperature monitoring during daily use. IC Role / Device Role / Timing Role: Standalone charge controller handling preconditioning, 100 mA USB charging, and NTC-based thermal cutoff before battery reaches 60°C. Use Value: Delivers UL/IEC 62368-1 compliant charge safety without host intervention - meets EN 62133 battery certification requirements out-of-box.
Digital Camera Power Path	Handheld Medical Device Charger
Use Scenario: Portable digital camera with hot-swap battery, simultaneous charging and operation, and AC/USB field recharging capability. IC Role / Device Role / Timing Role: Dual-input power manager enabling concurrent system load and battery charge via integrated pass transistor and LDO mode. Use Value: Supports "charge while operating" without voltage droop or brown-out - maintains sensor and display functionality during 500 mA AC fast charge.	Use Scenario: FDA-cleared handheld diagnostic device requiring fail-safe Li-ion charging, traceable thermal logging, and guaranteed end-of-charge detection. IC Role / Device Role / Timing Role: Certified charge controller providing automatic recharge at 94% VREG, 5% ITERM termination, and PG-driven power-good assertion for system boot validation. Use Value: Reduces design verification effort for IEC 60601-1 compliance - built-in UVLO hysteresis and thermal shutdown satisfy Clause 15.3.2 leakage and fault protection.

Smartphone Charging System

Bluetooth Headset Battery Management

Use Scenario: Dual-input (USB + wall adapter) charging in space-constrained smartphone mainboard with thermally sensitive battery compartment.

IC Role / Device Role / Timing Role: Primary linear charger IC managing CC/CV profile, source arbitration, thermal foldback, and charge status signaling to AP.

Use Value: Eliminates need for discrete MOSFETs, current-sense amps, and external timers - reduces BOM count by ≥7 components and PCB area by >30 mm².

Use Scenario: Ultra-low-power wearable headset requiring safe, certified USB charging and battery temperature monitoring during daily use.

IC Role / Device Role / Timing Role: Standalone charge controller handling preconditioning, 100 mA USB charging, and NTC-based thermal cutoff before battery reaches 60°C.

Use Value: Delivers UL/IEC 62368-1 compliant charge safety without host intervention - meets EN 62133 battery certification requirements out-of-box.

Digital Camera Power Path

Handheld Medical Device Charger

Use Scenario: Portable digital camera with hot-swap battery, simultaneous charging and operation, and AC/USB field recharging capability.

IC Role / Device Role / Timing Role: Dual-input power manager enabling concurrent system load and battery charge via integrated pass transistor and LDO mode.

Use Value: Supports "charge while operating" without voltage droop or brown-out - maintains sensor and display functionality during 500 mA AC fast charge.

Use Scenario: FDA-cleared handheld diagnostic device requiring fail-safe Li-ion charging, traceable thermal logging, and guaranteed end-of-charge detection.

IC Role / Device Role / Timing Role: Certified charge controller providing automatic recharge at 94% VREG, 5% ITERM termination, and PG-driven power-good assertion for system boot validation.

Use Value: Reduces design verification effort for IEC 60601-1 compliance - built-in UVLO hysteresis and thermal shutdown satisfy Clause 15.3.2 leakage and fault protection.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Li-ion linear charge management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP73831T-2DCI/OT	Single-input (USB only), no VAC pin, fixed 4.20V, 500 mA max, no PG output, SOT-23-5 package	Lacks AC adapter support and power-good monitoring - suitable only for USB-only, ultra-low-cost designs with no thermal monitoring requirement	Select when board space is < 3 mm² and AC charging is unnecessary; verify thermistor interface compatibility.
BQ24075RGTR	TI part with identical 4.20V/500 mA USB + 1A AC capability, but uses different PROG pin logic (current-source vs. resistor), no integrated PG, and requires external reverse-blocking FET	Needs additional MOSFET and layout changes for reverse discharge protection - increases BOM cost and footprint by ~25%	Choose only if existing TI ecosystem mandates BOM alignment; confirm PROG2 logic mapping and thermal response timing against DS20002071C.

Compared with MCP73831T-2DCI/OT, the MCP73837-NVI/UN adds dual-input autonomy and PG monitoring; compared with BQ24075RGTR, it integrates reverse discharge protection and simplifies thermal sensing - reducing total solution size and qualification effort.

Availability

MCP73837-NVI/UN is available at Aetrix Electronics and suitable for smartphone charging systems, Bluetooth headset battery management, digital camera power path, handheld medical device chargers, and portable media players requiring stable component supply, long-term lifecycle support, and full regulatory documentation.

Supply support for MCP73837-NVI/UN 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 leading provider of microcontrollers, analog devices, and battery management ICs, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The MCP738xx family is designed specifically for highly integrated, space-constrained Li-ion charging in portable consumer and medical electronics - emphasizing autonomous operation, safety compliance, and minimal external component count.

FAQ

What is the exact charge voltage setting for MCP73837-NVI/UN?

The MCP73837-NVI/UN is factory-configured for a precise 4.20 V ±0.5% constant-voltage regulation, optimized for standard single-cell Li-ion batteries. This value is fixed and not user-adjustable - unlike other variants in the MCP73837/8 family offering 4.35 V, 4.40 V, or 4.50 V options. The tolerance ensures reliable full-charge termination without cell stress.

Does MCP73837-NVI/UN support automatic recharge, and how is the threshold set?

Yes, MCP73837-NVI/UN supports automatic recharge with a factory-set voltage threshold of 94.0% of VREG (3.948 V), which triggers reinitiation of the charge cycle when battery voltage drops below that level after full charge. This threshold is not externally adjustable and is consistent across all MCP73837-NVI/UN units per DS20002071C Section 1.0.

How does the thermal regulation function in MCP73837-NVI/UN during high-ambient operation?

MCP73837-NVI/UN dynamically reduces charge current when die temperature approaches 150°C (thermal shutdown threshold), using on-die thermal sensing. This foldback behavior - documented in Figure 2-12 and 2-13 of DS20002071C - maintains safe operation without external components, preserving battery health and preventing thermal runaway during sustained 1A AC charging in enclosed enclosures.

Can MCP73837-NVI/UN operate with only a USB input, and what is the minimum required VUSB voltage?

Yes, MCP73837-NVI/UN operates autonomously with only VUSB applied. The minimum valid USB input voltage is 3.35 V (UVLO start threshold), with hysteresis of 75 mV ensuring stable entry/exit from operation. Below this, the device remains in shutdown with <2 µA reverse discharge current - critical for maintaining battery charge during low-power USB host states.

What is the role of the PG (Power-Good) pin on MCP73837-NVI/UN, and is it available on all variants?

The PG pin on MCP73837-NVI/UN is an open-drain output that asserts low when a valid input (VAC or VUSB) is present and above UVLO thresholds - confirming system power readiness. It is exclusive to the MCP73837 series; the pin is repurposed as Timer Enable (TE) on MCP73838 variants. PG enables simple power-status handshaking with host MCUs without additional supervisor ICs.

MCP73837-NVI/UN Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tube

Product Status:: Active

Battery Chemistry:: Lithium Ion/Polymer

Number of Cells:: 1

Current - Charging:: Constant - Programmable

Programmable Features:: -

Fault Protection:: Over Voltage

Charge Current - Max:: 1.1A

Battery Pack Voltage:: 4.35V

Voltage - Supply (Max):: 6V

Interface:: USB

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

MCP73837-NVI/UN FAQ

1.How can I place an order for MCP73837-NVI/UN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73837-NVI/UN 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 MCP73837-NVI/UN reliable?

The price and inventory of MCP73837-NVI/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73837-NVI/UN is usually 5 days.

3.What payment methods are accepted for MCP73837-NVI/UN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP73837-NVI/UN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MCP73837-NVI/UN?

MCP73837-NVI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP73837-NVI/UN 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 MCP73837-NVI/UN?

For technical support, including MCP73837-NVI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73837-NVI/UN requirements.

6.How does Aetrix verify that MCP73837-NVI/UN is sourced from the original manufacturer or authorized distributors?

All MCP73837-NVI/UN 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 MCP73837-NVI/UN meets industry standards.

7.What is the process for return or replacement of MCP73837-NVI/UN?

All MCP73837-NVI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73837-NVI/UN, 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 MCP73837-NVI/UN part is unused and in its original packaging.

Return procedure for MCP73837-NVI/UN:

1.Submit a request within 90 days.

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

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