Microchip Technology TC1303A-RI1EMFTR

Overview

TC1303A-RI1EMFTR 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 the buck output only. It delivers 90% typical efficiency at 2.0 MHz switching frequency, 65 µA total quiescent current, and operates across –40°C to +125°C junction temperature. Used in portable medical instruments requiring stable core and bias rails.

For engineers reviewing the TC1303A-RI1EMFTR datasheet, TC1303A-RI1EMFTR pinout, TC1303A-RI1EMFTR application, or TC1303A-RI1EMFTR equivalent, key selection criteria include buck/LDO output voltage configuration, PG monitoring scope (buck-only), shutdown independence, thermal performance in 3×3 DFN, and compatibility with ceramic output capacitors.

Technical Context

The TC1303A-RI1EMFTR implements a fixed-frequency PWM buck stage with automatic transition to PFM mode under light load to maintain ultra-low IQ, while its LDO uses internal compensation and requires only a 1 µF ceramic output capacitor. The power-good signal is an open-drain output tied exclusively to VOUT1 regulation with 300 ms delay for processor reset sequencing.

Its dual independent shutdown inputs (SHDN1, SHDN2) enable selective disabling of buck and LDO outputs without cross-interference, and undervoltage lockout (UVLO) activates at 2.55 V (typ) with 200 mV hysteresis to prevent erratic startup during brownout conditions.

Key Specifications

Pinout & Package

TC1303A-RI1EMFTR is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. Pin 1 is SHDN2; pin 10 is PG. The package supports high-power-density layouts and achieves θJA = 41°C/W on a 4-layer board with thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TC1303B-RI1EMFTR and TPS65023RGTR, TC1303A-RI1EMFTR offers the lowest quiescent current and simplest integration for buck-first reset sequencing, making it optimal for space-constrained, battery-sensitive applications where only two rails and buck-monitored PG are needed.

Availability

TC1303A-RI1EMFTR is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered diagnostic devices, and industrial handheld scanners requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for TC1303A-RI1EMFTR 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 Flash-IP solutions, with a strong focus on embedded control and power management ICs.

The TC1303 family was designed specifically for portable and battery-operated systems needing highly integrated, low-quiescent-current dual-rail power conversion with precise power-good signaling and robust thermal performance.

FAQ

What output voltages does the TC1303A-RI1EMFTR support?

The TC1303A-RI1EMFTR supports adjustable buck output from 0.8 V to 4.5 V via external feedback resistors, or fixed buck outputs including 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V. Its LDO output is fixed at 1.5 V, 1.8 V, 2.5 V, or 3.3 V depending on variant - the TC1303A-RI1EMFTR specifically delivers 1.8 V on VOUT1 (buck) and 3.3 V on VOUT2 (LDO), as indicated by the 'RI' suffix per Microchip's ordering guide.

How does the power-good (PG) function operate in TC1303A-RI1EMFTR?

The TC1303A-RI1EMFTR's PG pin is an open-drain output that asserts low when the buck regulator output (VOUT1) reaches 94% of its target voltage and remains asserted for ≥300 ms after regulation is achieved. It monitors VOUT1 only - not VOUT2 - and is designed to drive standard microcontroller reset inputs with an external pull-up resistor.

Can TC1303A-RI1EMFTR operate from a single 3.7 V Li-ion cell?

Yes. The TC1303A-RI1EMFTR supports input voltages from 2.7 V to 5.5 V, making it compatible with discharged Li-ion cells down to 2.7 V. Its 137 mV LDO dropout at 200 mA and 280 mV buck dropout at 500 mA ensure usable output voltage across the full battery discharge curve, especially when paired with 1.8 V and 3.3 V outputs.

What thermal performance can be expected from TC1303A-RI1EMFTR in a 3×3 DFN package?

In a typical 4-layer PCB layout with thermal vias under the exposed pad, TC1303A-RI1EMFTR achieves θJA = 41°C/W. At 500 mA buck load and 300 mA LDO load with 3.6 V input, junction temperature rise remains within safe limits up to +85°C ambient - validated across the full –40°C to +125°C operating junction range specified in DS21949C.

Is external compensation required for the LDO in TC1303A-RI1EMFTR?

No. The LDO in TC1303A-RI1EMFTR is internally compensated and requires only a single 1 µF ceramic output capacitor on VOUT2 for stability. This eliminates external compensation components, reduces layout sensitivity, and accelerates design validation - a key differentiator versus discrete LDO + buck combinations.