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

Microchip Technology MCP73834-CNI/UN

Name: MCP73834-CNI/UN
Brand: Microchip Technology
SKU: MCP73834-CNI/UN
Price: 2.40 USD
Availability: InStock
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Part No.:: MCP73834-CNI/UN

Manufacturer:: Microchip Technology

Category:: Battery Chargers

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

Datasheet:: MCP73834-CNI/UN.pdf

Description:: IC BATT CNTRL LI-ION 1CEL 10MSOP

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Product details

Overview

MCP73834-CNI/UN from Microchip Technology is a stand-alone linear Li-ion/Li-polymer battery charge management controller in MSOP-10 package, featuring 4.20 V ±0.75% constant-voltage regulation, programmable 100 mA–1 A fast-charge current via external PROG resistor, integrated P-channel MOSFET pass transistor (300 mΩ R_DS(on)), and thermal regulation for safe charging in portable USB-powered devices.

For engineers reviewing the MCP73834-CNI/UN datasheet, MCP73834-CNI/UN pinout, MCP73834-CNI/UN application, or MCP73834-CNI/UN equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and two validated alternative parts with documented functional and packaging differences.

Technical Context

The MCP73834-CNI/UN implements a full linear CC/CV charge algorithm with factory-set 4.20 V regulation, selectable preconditioning (10–100% of I_REG), and automatic recharge at 94–96.5% of V_REG. It integrates current sense, reverse discharge protection, and die-temperature-based current limiting to maintain reliability under high ambient or power-dissipation conditions.

Unlike the MCP73833, the MCP73834-CNI/UN substitutes PG output with Timer Enable (TE) input - a 1.8 V–compatible logic control that disables the internal safety timer during system-load-powered charging. Its THERM pin sources 50 µA for NTC thermistor monitoring, comparing against fixed 1.23 V and 0.25 V thresholds to suspend charging on over/under-temperature events.

Key Specifications

Parameter	Value and Actual Design Meaning
Voltage Regulation	4.20 V ±0.75% - precise termination voltage for standard single-cell Li-ion batteries; ensures full capacity without overvoltage stress.
Fast Charge Current	100 mA to 1000 mA - set by 1 kΩ–10 kΩ PROG-to-VSS resistor; enables scalable design across battery capacities from 180 mAh to >1000 mAh.
Preconditioning Ratio	10–100% of I_REG - configurable trickle-charge for deeply depleted cells; prevents lithium plating below 3.0 V.
Thermal Regulation	Active current reduction above ~105°C - maintains safe junction temperature without external thermal sensors; extends device lifetime in compact enclosures.
Timer Enable Input (TE)	1.8 V–compatible logic input - disables internal safety timer when pulled low; allows concurrent battery charging and system operation from same source.
Thermistor Bias Current	50 µA ±6% - stable current source independent of VDD - enables accurate NTC voltage measurement for ±5°C temperature monitoring accuracy.
Supply Voltage Range	3.75 V to 6.0 V - supports direct USB 5 V input and legacy 5.25 V wall adapters; includes 100 mV UVLO hysteresis for clean startup/shutdown.

Pinout & Package

Package: MSOP-10 (3 mm × 3 mm, 0.5 mm pitch), exposed thermal pad (EP) internally connected to VSS - requires soldering EP to PCB ground plane for thermal performance and electrical stability.

Pin/Terminal	Circuit Role	Design Meaning
1, 2	VDD	Battery management input supply (3.75–6 V); bypassed to VSS with ≥1 µF capacitor to suppress input ripple and ensure UVLO stability.
3	STAT1	Open-drain status output - low during active charge (CC/CV), high-impedance at EOC or fault; drives LED or microcontroller interrupt.
4	STAT2	Open-drain status output - low only at end-of-charge (EOC); complements STAT1 for dual-LED or logic-level state decoding.
5	VSS	0 V reference - common return for battery negative, input supply ground, and exposed thermal pad (EP).
6	PROG	Current regulation set input - resistor to VSS programs fast charge current (I_REG = 1000 V / R_PROG); floating disables charge.
7	TE	Timer Enable input - low enables internal safety timer (3.6–8.8 hrs), high disables it; 1.8 V logic compatible; unique to MCP73834 variant.
8	THERM	Thermistor bias input - 50 µA current source for NTC; voltage compared to 1.23 V / 0.25 V thresholds to detect over/under-temperature faults.
9, 10	VBAT	Battery charge control output - drain of internal P-MOSFET; connects directly to battery positive; bypassed with ≥4.7 µF ceramic for >250 mA stability.
EP	Exposed Thermal Pad	Internally tied to VSS - must be soldered to solid copper pour for thermal dissipation (θ_JA = 113°C/W) and noise immunity.

Key Features

Feature	Design Value
Integrated P-MOSFET Pass Transistor	300 mΩ R_DS(on) at V_GS = −1.5 V - eliminates external FET and gate driver, reducing BOM count and PCB area in space-constrained designs.
Programmable Safety Timer	Configurable 3.6–8.8 hr elapsed time limit - prevents indefinite charging due to faulty battery or sensor; disabled via TE pin for system-load scenarios.
Reverse Discharge Protection	<2 µA leakage when VDD removed - blocks battery self-discharge through input path; critical for USB-hosted devices left unpowered.
System Test (LDO) Mode	Regulated 4.20 V output up to programmed I_REG - enables battery-less system validation using THERM pin override; requires no external regulator.
Thermal Regulation + Shutdown	Current throttling above ~105°C; hard shutdown at 150°C ±10°C - dual-layer thermal protection meets IEC 62368-1 safety requirements.

Applications

USB-Powered Portable Devices	Wearable Health Monitors
Use Scenario: Charging compact Bluetooth earbuds or smartwatches directly from USB 5 V bus while maintaining strict size and thermal constraints. IC Role / Device Role: Stand-alone linear charger managing CC/CV profile, cell temperature, and end-of-charge signaling without host MCU intervention. Use Value: Eliminates need for external current-sense resistor and discrete MOSFET, reducing solution size by >30% versus discrete implementations.	Use Scenario: Recharging small-capacity Li-polymer batteries (150–300 mAh) in continuous glucose monitors or pulse oximeters with medical-grade safety compliance. IC Role / Device Role: Battery management controller enforcing preconditioning, thermal cutoff, and automatic recharge to maximize cycle life and field reliability. Use Value: Factory-trimmed 4.20 V regulation ±0.75% and 50 µA thermistor bias enable Class II medical device certification without calibration.
Industrial Handheld Terminals	Smart Home Sensors
Use Scenario: Powering ruggedized barcode scanners or RFID readers with intermittent USB charging and continuous system load operation. IC Role / Device Role: Charger with TE pin disabling safety timer during concurrent charging/system operation - avoids premature timeout in always-on use cases. Use Value: Enables true "charge-through" functionality where battery charges while powering active peripherals - not possible with fixed-timer-only chargers.	Use Scenario: Enabling multi-year battery life in battery-operated Zigbee/Z-Wave motion or environmental sensors with infrequent USB top-up. IC Role / Device Role: Low-quiescent linear charger providing <100 µA standby current and automatic recharge at 94% V_REG to prevent deep discharge. Use Value: 50 µA typical shutdown current and 100 mV UVLO hysteresis extend shelf life and ensure reliable cold-start after long storage.

USB-Powered Portable Devices

Wearable Health Monitors

Use Scenario: Charging compact Bluetooth earbuds or smartwatches directly from USB 5 V bus while maintaining strict size and thermal constraints.

IC Role / Device Role: Stand-alone linear charger managing CC/CV profile, cell temperature, and end-of-charge signaling without host MCU intervention.

Use Value: Eliminates need for external current-sense resistor and discrete MOSFET, reducing solution size by >30% versus discrete implementations.

Use Scenario: Recharging small-capacity Li-polymer batteries (150–300 mAh) in continuous glucose monitors or pulse oximeters with medical-grade safety compliance.

IC Role / Device Role: Battery management controller enforcing preconditioning, thermal cutoff, and automatic recharge to maximize cycle life and field reliability.

Use Value: Factory-trimmed 4.20 V regulation ±0.75% and 50 µA thermistor bias enable Class II medical device certification without calibration.

Industrial Handheld Terminals

Smart Home Sensors

Use Scenario: Powering ruggedized barcode scanners or RFID readers with intermittent USB charging and continuous system load operation.

IC Role / Device Role: Charger with TE pin disabling safety timer during concurrent charging/system operation - avoids premature timeout in always-on use cases.

Use Value: Enables true "charge-through" functionality where battery charges while powering active peripherals - not possible with fixed-timer-only chargers.

Use Scenario: Enabling multi-year battery life in battery-operated Zigbee/Z-Wave motion or environmental sensors with infrequent USB top-up.

IC Role / Device Role: Low-quiescent linear charger providing <100 µA standby current and automatic recharge at 94% V_REG to prevent deep discharge.

Use Value: 50 µA typical shutdown current and 100 mV UVLO hysteresis extend shelf life and ensure reliable cold-start after long storage.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP73833-CNI/UN	Replaces TE pin with PG (power-good) open-drain output; identical CC/CV, PROG, THERM, and STAT functions.	Used where host system requires input power presence detection instead of timer disable; lacks TE functionality for charge-through mode.	Select when system needs PG signal for power sequencing and does not require concurrent charging + load operation.
BQ24075RGTR	TI part with 4.2 V regulation, 1.5 A max charge current, and integrated LDO; no TE pin but offers I²C programmability and VBUS detection.	Supports higher current and system power-path management; requires firmware integration; larger 16-pin QFN package.	Select when design requires >1 A charging, I²C configuration, or integrated system power switch - not for drop-in replacement.

Compared with MCP73833-CNI/UN, the MCP73834-CNI/UN trades PG output for TE control-enabling safer charge-through operation but removing power-good signaling. Versus BQ24075RGTR, it offers simpler analog configuration and smaller MSOP-10 footprint, at the cost of programmability and higher current capability.

Availability

MCP73834-CNI/UN is available at Aetrix Electronics and suitable for USB-powered portable devices, wearable health monitors, industrial handheld terminals, and smart home sensors requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MCP73834-CNI/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 Inc. is a leading provider of microcontrollers, analog components, and battery management ICs, serving automotive, industrial, and consumer markets with high-reliability silicon and comprehensive design tools.

The MCP73833/4 product line delivers highly integrated, cost-optimized linear Li-ion charge controllers for space-constrained portable electronics - designed specifically to reduce external component count while meeting USB power bus compliance and safety standards.

FAQ

What is the key functional difference between MCP73834-CNI/UN and MCP73833-CNI/UN?

The MCP73834-CNI/UN replaces the Power Good (PG) output of the MCP73833-CNI/UN with a Timer Enable (TE) input. This allows disabling the internal safety timer during concurrent battery charging and system load operation - a critical feature for charge-through applications. All other core functions (CC/CV regulation, PROG programming, THERM monitoring, STAT outputs) remain identical in the MCP73834-CNI/UN.

How do I set the fast charge current for MCP73834-CNI/UN?

The fast charge current for MCP73834-CNI/UN is set by connecting a resistor (R_PROG) from the PROG pin to VSS. Use the formula I_REG = 1000 V / R_PROG, where R_PROG is in kΩ and I_REG is in mA. For example, a 1.0 kΩ resistor yields ~1000 mA, while a 10 kΩ resistor yields ~100 mA. The MCP73834-CNI/UN supports 100–1000 mA range with ≤±10% regulation accuracy.

Does MCP73834-CNI/UN support battery temperature monitoring?

Yes, the MCP73834-CNI/UN supports battery temperature monitoring via its THERM pin, which sources a precise 50 µA ±6% current for biasing standard 10 kΩ NTC thermistors. The device compares the resulting voltage against factory-set thresholds (1.23 V and 0.25 V) and suspends charging if out-of-range - ensuring safe operation across −40°C to +85°C ambient.

Can MCP73834-CNI/UN operate without a battery connected?

Yes, the MCP73834-CNI/UN can operate in System Test (LDO) mode when the THERM pin is driven above (VDD − 100 mV) and no battery is present. In this mode, it regulates VBAT to the selected 4.20 V output with current limited to the programmed I_REG, enabling battery-less system validation - a capability confirmed in the DS22005B datasheet for MCP73834-CNI/UN.

What package type and thermal considerations apply to MCP73834-CNI/UN?

The MCP73834-CNI/UN is supplied in an MSOP-10 package (3 mm × 3 mm) with an exposed thermal pad (EP) internally connected to VSS. To ensure thermal reliability, EP must be soldered to a PCB ground plane; this achieves θ_JA = 113°C/W. Without proper EP grounding, junction temperature rise may exceed safe limits during 1 A charging - directly impacting regulation accuracy and longevity of the MCP73834-CNI/UN.

MCP73834-CNI/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:: Current

Fault Protection:: Over Temperature

Charge Current - Max:: 1.1A

Battery Pack Voltage:: 4.2V

Voltage - Supply (Max):: 6V

Interface:: -

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

MCP73834-CNI/UN FAQ

1.How can I place an order for MCP73834-CNI/UN through Aetrix?

Please submit a Request for Quotation (RFQ) for MCP73834-CNI/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 MCP73834-CNI/UN reliable?

The price and inventory of MCP73834-CNI/UN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP73834-CNI/UN is usually 5 days.

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MCP73834-CNI/UN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MCP73834-CNI/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 MCP73834-CNI/UN?

For technical support, including MCP73834-CNI/UN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP73834-CNI/UN requirements.

6.How does Aetrix verify that MCP73834-CNI/UN is sourced from the original manufacturer or authorized distributors?

All MCP73834-CNI/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 MCP73834-CNI/UN meets industry standards.

7.What is the process for return or replacement of MCP73834-CNI/UN?

All MCP73834-CNI/UN units undergo pre-shipment inspection (PSI). If there is an issue with MCP73834-CNI/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 MCP73834-CNI/UN part is unused and in its original packaging.

Return procedure for MCP73834-CNI/UN:

1.Submit a request within 90 days.

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

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