Microchip Technology MCP73830LT-0AAI/MYY

Overview

MCP73830LT-0AAI/MYY from Microchip Technology is a single-cell Li-Ion/Li-Polymer linear battery charge management controller with integrated P-channel pass transistor, current sense, and reverse discharge protection. It delivers 4.20 V ±0.75% constant-voltage regulation, programmable 100–1000 mA fast-charge current via external PROG resistor, and fixed 4-hour elapsed timer - designed for compact portable electronics requiring space-constrained, low-component-count charging solutions.

For engineers reviewing the MCP73830LT-0AAI/MYY datasheet, MCP73830LT-0AAI/MYY pinout, MCP73830LT-0AAI/MYY application, or MCP73830LT-0AAI/MYY equivalent, this page provides verified technical context, validated pin functions, confirmed thermal shutdown (150°C), UVLO thresholds (3.6 V start/3.3 V stop), and real-world design meaning for charge termination (7.5% or 10% of I_REG), preconditioning (10% ratio or disabled), and automatic power-down (VBAT + 50 mV entry).

Technical Context

The MCP73830LT-0AAI/MYY implements a factory-configured constant-current/constant-voltage (CC/CV) algorithm optimized for single-cell Li-Ion/Li-Polymer batteries, with fixed 4.20 V regulation and no auto-recharge. Its internal P-MOSFET operates in linear mode, enabling precise current control via PROG resistor while integrating thermal foldback to limit charge current above 150°C junction temperature.

It features dual-stage safety logic: undervoltage lockout (UVLO) activates at VDD < 3.3 V and deactivates at VDD > 3.6 V, and automatic power-down engages when VDD falls within +50 mV of VBAT. The STAT open-drain output signals status (low during active charge, high-Z at completion or shutdown), and CE pin enables standby mode when pulled high.

Key Specifications

Pinout & Package

Package: TDFN-6 (2 mm × 2 mm) with exposed thermal pad (EP) for enhanced heat dissipation in space-limited PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ24075RGTR and TP4056, the MCP73830LT-0AAI/MYY offers the tightest voltage regulation (±0.75%), integrated UVLO hysteresis, and factory-configurable no-auto-recharge behavior - making it optimal for space-constrained, reliability-critical Li-Ion charging where algorithm simplicity and long-term stability outweigh programmability needs.

Availability

MCP73830LT-0AAI/MYY is available at Aetrix Electronics and suitable for Bluetooth headsets, portable media players, rechargeable 3D glasses, and toy/gaming controllers requiring stable component supply, guaranteed long-term availability, and full traceability.

Supply support for MCP73830LT-0AAI/MYY 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 global semiconductor company specializing in microcontrollers, analog, interface, and power management ICs, with emphasis on embedded control and energy-efficient solutions.

The MCP73830/L product line was engineered specifically for ultra-compact, low-component-count linear charging of single-cell Li-Ion/Li-Polymer batteries in portable consumer electronics - prioritizing integration, thermal safety, and factory-programmed consistency over configurability.

FAQ

What is the factory-set charge voltage and tolerance for MCP73830LT-0AAI/MYY?

The MCP73830LT-0AAI/MYY has a factory-preset constant-voltage regulation of 4.20 V with a tolerance of ±0.75% over –5°C to +55°C ambient. This value is laser-trimmed during manufacturing and cannot be adjusted externally. It aligns precisely with the standard full-charge voltage for commercial single-cell Li-Ion and Li-Polymer batteries, ensuring safe and optimal capacity utilization without risk of overvoltage stress. The MCP73830LT-0AAI/MYY maintains this accuracy across its full operating temperature range of –40°C to +85°C.

Does MCP73830LT-0AAI/MYY support automatic recharge after charge completion?

No, the MCP73830LT-0AAI/MYY is configured with no automatic recharge functionality. When charge termination occurs - either via current taper (7.5% or 10% of I_REG) or elapsed timer expiry - the device enters Charge Complete mode and disables charging until a manual reset event: battery removal/reinsertion, VDD power cycle, or toggling of the CE pin. This behavior is factory-set and distinguishes MCP73830LT-0AAI/MYY from variants like MCP73830T-2AAI/MYY, which include auto-recharge. The absence of auto-recharge enhances long-term battery health in intermittently used devices.

How is the fast-charge current programmed on MCP73830LT-0AAI/MYY?

The fast-charge current for MCP73830LT-0AAI/MYY is set using a single external resistor (R_PROG) connected between the PROG pin and VSS. The relationship follows I_REG = 1000 / R_PROG (where R_PROG is in kΩ and I_REG is in mA), yielding a programmable range of 100–1000 mA. For example, a 2.0 kΩ resistor sets 500 mA. The MCP73830LT-0AAI/MYY uses the MCP73830 variant's current range (not the MCP73830L's 20–200 mA), confirmed by its part number suffix "T" and datasheet Table 1 factory options.

What thermal protection mechanisms does MCP73830LT-0AAI/MYY implement?

The MCP73830LT-0AAI/MYY incorporates two complementary thermal protections: (1) thermal foldback - continuously reduces charge current as die temperature rises above normal operating levels, optimizing charge time while preserving reliability; and (2) thermal shutdown - suspends all charging if junction temperature exceeds 150°C, with automatic resumption after cooling by ~10°C. These functions operate independently of external components and are validated across the full –40°C to +85°C ambient range. The TDFN-6 package's θ_JA = 91°C/W requires proper PCB thermal design (exposed pad + vias) to sustain rated current without exceeding T_J limits.

Can MCP73830LT-0AAI/MYY operate without a battery connected?

Yes, the MCP73830LT-0AAI/MYY is stable and fully functional with no battery connected. In this condition, VBAT floats but remains regulated by internal circuitry, and the device continues monitoring VDD, CE, and PROG inputs. The STAT output behaves normally (high-Z in standby, low during simulated charge attempts), and UVLO/power-down logic remains active. However, charge current cannot flow without a load path, so the CC/CV algorithm remains idle. This capability simplifies system-level testing and allows safe pre-power validation of the charger circuit before battery integration - a key advantage of the MCP73830LT-0AAI/MYY's robust architecture.