Microchip Technology TC1303B-VA0EMFTR

Overview

TC1303B-VA0EMFTR 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 specifically of the LDO output. It delivers fixed 3.3 V on VOUT1 and 2.5 V on VOUT2, operates from 2.7–5.5 V input, features 65 µA typical quiescent current, and supports -40°C to +125°C junction temperature - used in portable medical instruments and USB-powered devices requiring tightly regulated dual-rail supplies.

For engineers reviewing the TC1303B-VA0EMFTR datasheet, TC1303B-VA0EMFTR pinout, TC1303B-VA0EMFTR application, or TC1303B-VA0EMFTR equivalent, key selection criteria include LDO-monitored PG behavior, independent shutdown control for each regulator, 2.0 MHz fixed-frequency PWM operation with automatic PFM transition, 137 mV typical dropout at 200 mA, and DFN-10 (3×3 mm) package compatibility with thermal pad grounding.

Technical Context

The TC1303B-VA0EMFTR implements a synchronous buck stage with integrated P-channel and N-channel MOSFETs (R_DS(on) = 450 mΩ each), fixed 2.0 MHz switching frequency under heavy load, and seamless auto-transition to PFM mode at light loads to maintain ultra-low IQ. Its LDO stage uses internal compensation and achieves 25 ppm/°C temperature coefficient with 1 µF ceramic output capacitance.

Power-good logic is configured as a push-pull output (unlike open-drain variants) that asserts when VOUT2 reaches ≥94% of nominal (2.35 V for 2.5 V output) with 300 ms delay, and deasserts at ≤92% (2.3 V); this timing is critical for processor reset sequencing in battery-powered systems.

Key Specifications

Pinout & Package

TC1303B-VA0EMFTR is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. The package supports high-power-density layouts and requires solder paste stencil design per Microchip's AN1187 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TC1303A-VA0EMFTR and TPS65023RGZR, TC1303B-VA0EMFTR uniquely provides LDO-specific push-pull PG signaling in a minimal 3×3 mm DFN, making it optimal for space-constrained, single-LDO-critical applications like portable diagnostics and USB peripherals.

Availability

TC1303B-VA0EMFTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TC1303B-VA0EMFTR 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 components, and power management ICs, serving industrial, automotive, and consumer markets with high-reliability silicon solutions.

The TC1303 family was designed to deliver cost-effective, space-efficient dual-rail power for battery-powered portable electronics - emphasizing ultra-low IQ, integrated compensation, and flexible power-good monitoring per output rail.

FAQ

What output voltages does the TC1303B-VA0EMFTR provide?

The TC1303B-VA0EMFTR delivers fixed 3.3 V on its buck output (VOUT1) and fixed 2.5 V on its LDO output (VOUT2). These values are factory-trimmed and do not require external feedback resistors. The 3.3 V rail supports digital logic and communication interfaces, while the 2.5 V rail powers precision analog circuitry such as ADCs and sensors - both meeting ±0.3% tolerance over -40°C to +85°C ambient.

How does the power-good (PG) function operate in TC1303B-VA0EMFTR?

In TC1303B-VA0EMFTR, the PG pin monitors only the LDO output (VOUT2). It asserts high (push-pull) when VOUT2 reaches ≥94% of 2.5 V (i.e., ≥2.35 V) and deasserts low when VOUT2 falls ≤92% (≤2.3 V), with 2% hysteresis. A built-in 300 ms delay ensures stable reset assertion after power-up, directly compatible with standard processor RESET inputs without external RC networks.

Can TC1303B-VA0EMFTR operate with a single input source for both regulators?

Yes - TC1303B-VA0EMFTR is designed for shared input operation: VIN1 (buck) and VIN2 (LDO) must be connected together with short, low-inductance traces. The datasheet specifies that both inputs accept 2.7–5.5 V and are intended to be supplied from the same source (e.g., Li-ion battery or USB 5 V), simplifying power architecture and reducing bill-of-materials count.

What is the thermal performance of TC1303B-VA0EMFTR in its DFN package?

TC1303B-VA0EMFTR in the 10-pin DFN (3×3 mm) package has a typical junction-to-ambient thermal resistance (θ_JA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the exposed pad. This enables continuous 500 mA buck + 300 mA LDO operation up to +85°C ambient without derating, provided the EP is soldered to AGND and the layout follows Microchip's AN1187 thermal guidelines.

Does TC1303B-VA0EMFTR support independent enable/disable of each regulator?

Yes - TC1303B-VA0EMFTR provides two independent shutdown pins: SHDN1 controls the buck regulator and SHDN2 controls the LDO. Each is active-high (logic high >45% VIN enables output). This allows flexible power sequencing - for example, disabling only the buck regulator during sleep while maintaining LDO bias for real-time clock or sensor bias, reducing system IQ to just 46 µA.