Microchip Technology TC1303C-VP0EUNTR

Overview

TC1303C-VP0EUNTR from Microchip Technology is a dual-output power management IC integrating a 500 mA synchronous buck regulator and a 300 mA low-dropout linear regulator (LDO), with power-good monitoring of both outputs. It delivers 1.8V/500 mA and 3.3V/300 mA outputs from a 2.7–5.5V input, features 65 µA typical quiescent current, 2.0 MHz fixed-frequency PWM operation, and operates across –40°C to +125°C for portable medical instruments and USB-powered devices.

For engineers reviewing the TC1303C-VP0EUNTR datasheet, TC1303C-VP0EUNTR pinout, TC1303C-VP0EUNTR application, or TC1303C-VP0EUNTR equivalent, key selection criteria include independent shutdown control per output, dual-output power-good assertion with 300 ms delay, adjustable or fixed VOUT1 (0.8–4.5V), LDO dropout of 137 mV @ 200 mA, and DFN/MSOP package compatibility with thermal resistance θJA = 41°C/W (DFN).

Technical Context

The TC1303C-VP0EUNTR implements a synchronous buck converter with automatic PWM-to-PFM mode transition under light load, maintaining high efficiency (>90% typical) and low output noise. Its internal compensation eliminates external loop components, while the integrated LDO uses a single 1 µF ceramic output capacitor and provides stable bias voltage with ±0.3% output tolerance.

Power-good logic monitors both VOUT1 and VOUT2 simultaneously-asserting open-drain PG when either output reaches 94% of regulation with 2% hysteresis-and incorporates 300 ms delay for processor reset sequencing. Undervoltage lockout (2.55V typ) and thermal shutdown (165°C) ensure robust system-level protection.

Key Specifications

Pinout & Package

TC1303C-VP0EUNTR is packaged in a 10-pin 3×3 mm DFN with exposed thermal pad (EP), pin-compatible with MSOP variant. The DFN offers θJA = 41°C/W on a 4-layer board with internal ground plane and 2 vias in EP, enabling high-power-density designs without heatsinks.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output PMIC applications.

Compared with MCP16321-DC1E/UN and TPS65023RSBR, TC1303C-VP0EUNTR uniquely integrates dual-output power-good monitoring with independent shutdown in a 3×3 mm DFN, delivering optimal size and sequencing control for space-constrained dual-rail portable systems.

Availability

TC1303C-VP0EUNTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TC1303C-VP0EUNTR 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, and mixed-signal ICs, with a focus on embedded control and power management solutions.

The TC1303 family is designed for cost-sensitive, space-constrained portable electronics requiring dual regulated supplies with intelligent power sequencing and fault monitoring.

FAQ

What output voltages does TC1303C-VP0EUNTR support?

TC1303C-VP0EUNTR supports a fixed 1.8V buck output (VOUT1) and fixed 3.3V LDO output (VOUT2), as indicated by the "VP0" suffix per Microchip's part numbering scheme. The buck regulator can alternatively be configured for adjustable output (0.8–4.5V) using external feedback resistors, while the LDO offers standard fixed options including 1.5V, 1.8V, 2.5V, and 3.3V - with TC1303C-VP0EUNTR specifically factory-set to 3.3V.

How does the power-good (PG) function operate in TC1303C-VP0EUNTR?

In TC1303C-VP0EUNTR, the PG pin is an open-drain output that asserts low only when both VOUT1 and VOUT2 are within 94% of their nominal values, with 2% hysteresis and a built-in 300 ms delay. This dual-rail monitoring ensures safe processor reset timing and eliminates false triggers during individual rail startup transients - a key differentiator from TC1303A (buck-only PG) and TC1303B (LDO-only PG).

What is the thermal performance of TC1303C-VP0EUNTR in its DFN package?

TC1303C-VP0EUNTR in the 10-pin 3×3 mm DFN package achieves θJA = 41°C/W on a typical 4-layer PCB with internal ground plane and two thermal vias under the exposed pad. This enables full 500 mA buck + 300 mA LDO operation up to +85°C ambient without forced airflow, and supports continuous operation at +125°C junction temperature with appropriate board-level thermal design.

Can TC1303C-VP0EUNTR operate from a single 3.3V input source?

Yes, TC1303C-VP0EUNTR supports input voltages from 2.7V to 5.5V, making it fully compatible with a 3.3V input source. However, due to the 137 mV typical dropout of the 3.3V LDO, VOUT2 will remain regulated only if VIN2 ≥ 3.437V - meaning a 3.3V source alone cannot sustain the LDO output. In practice, VIN1 and VIN2 must be tied together and supplied ≥3.44V (e.g., 3.6V–5.5V) to guarantee both outputs regulate correctly.

Does TC1303C-VP0EUNTR require external compensation components?

No, TC1303C-VP0EUNTR features internally compensated control loops for both the buck regulator and LDO, eliminating the need for external compensation capacitors or resistors. This simplifies design, reduces bill-of-materials cost, and improves layout robustness - particularly valuable in high-volume portable applications where layout variability must be minimized.