Microchip Technology TC1303B-DF0EMFTR

Overview

TC1303B-DF0EMFTR 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 1.5V/500 mA and 2.5V/300 mA outputs, operates from 2.7–5.5V input, features 65 µA typical quiescent current, and uses a 3x3 mm 10-pin DFN package for space-constrained portable electronics.

For engineers reviewing the TC1303B-DF0EMFTR datasheet, TC1303B-DF0EMFTR pinout, TC1303B-DF0EMFTR application, or TC1303B-DF0EMFTR equivalent, key selection criteria include independent shutdown control per rail, 137 mV typical LDO dropout at 200 mA, 2.0 MHz fixed-frequency PWM operation with automatic PFM transition, push-pull PG output tied to VOUT2 regulation, and -40°C to +125°C junction temperature rating.

Technical Context

The TC1303B-DF0EMFTR implements a synchronous buck converter with integrated high- and low-side 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 monitors only the LDO output (VOUT2) with 94% threshold high, 89% threshold low, 300 ms active timeout, and push-pull drive - distinct from TC1303A (buck-monitored, open-drain) and TC1303C/TC1304 (dual-monitored). Shutdown inputs SHDN1 and SHDN2 are independently controlled, enabling flexible rail sequencing in battery-powered systems.

Key Specifications

Pinout & Package

TC1303B-DF0EMFTR is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. The package supports ≤41°C/W junction-to-ambient thermal resistance on a 4-layer PCB with internal ground plane and two vias under the EP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TC1303A-DF0EMFTR and TPS65023RGZR, TC1303B-DF0EMFTR uniquely provides push-pull PG tied exclusively to LDO regulation - simplifying reset circuitry for systems where auxiliary rail integrity is critical, while maintaining minimal footprint and ultra-low quiescent current.

Availability

TC1303B-DF0EMFTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, industrial handheld terminals, and low-power IoT edge nodes requiring stable component supply with guaranteed long-term availability.

Supply support for TC1303B-DF0EMFTR 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 devices, and power management ICs, serving automotive, industrial, and consumer markets with high-reliability silicon solutions.

The TC1303 family targets space- and power-constrained portable electronics, delivering dual-rail power conversion with minimal external components and robust protection features for battery-operated systems.

FAQ

What output voltages does the TC1303B-DF0EMFTR provide?

The TC1303B-DF0EMFTR is a fixed-output variant delivering 1.5 V from its buck regulator (VOUT1) and 2.5 V from its LDO (VOUT2), as indicated by the "DF0" suffix in the part number. Both outputs are factory-trimmed to ±0.3% tolerance over temperature and load, eliminating need for external feedback resistors or calibration.

How does the power-good (PG) function operate in TC1303B-DF0EMFTR?

The TC1303B-DF0EMFTR's PG pin is a push-pull output that asserts high only when the LDO output (VOUT2) reaches and maintains 94–96% of its nominal 2.5 V value, with a 300 ms active timeout period. This differs from TC1303A (buck-monitored, open-drain) and ensures system reset is synchronized to auxiliary rail readiness.

Can TC1303B-DF0EMFTR operate from a single-cell Li-ion battery?

Yes, TC1303B-DF0EMFTR supports input voltages from 2.7 V to 5.5 V, covering the full discharge range of a single-cell Li-ion battery (typically 4.2 V fully charged down to 2.7 V cutoff). Its 137 mV LDO dropout at 200 mA enables stable 2.5 V output even at end-of-discharge, maximizing usable battery capacity.

What is the thermal performance of TC1303B-DF0EMFTR in its DFN package?

TC1303B-DF0EMFTR in the 3×3 mm DFN package achieves 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 allows continuous 500 mA buck output at ambient temperatures up to +85°C without derating, provided the EP is soldered to AGND.

Does TC1303B-DF0EMFTR require external compensation components?

No, TC1303B-DF0EMFTR integrates full internal compensation for both the buck regulator and LDO stages. The buck stage requires only an external 4.7 µH inductor and 4.7 µF input/output capacitors; the LDO requires only a 1 µF ceramic capacitor on VOUT2 - reducing BOM count and layout complexity.