Microchip Technology TC1303B-1H0EMFTR

Overview

TC1303B-1H0EMFTR 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 (VOUT2). It delivers 1.8 V on VOUT1 and 3.3 V on VOUT2, operates from 2.7–5.5 V input, achieves >90% typical efficiency at heavy load, and features 65 µA total quiescent current. It targets portable battery-powered systems requiring tightly regulated dual-rail supplies, such as handheld medical instruments and USB-powered devices.

For engineers reviewing the TC1303B-1H0EMFTR datasheet, TC1303B-1H0EMFTR pinout, TC1303B-1H0EMFTR application, or TC1303B-1H0EMFTR equivalent, this page provides verified electrical parameters, confirmed package mapping to 10-pin 3×3 DFN, validated pin functions including push-pull PG output tied to VOUT2 regulation, and two technically documented alternative parts for dual-output PMIC selection in space-constrained, low-quiescent-current designs.

Technical Context

The TC1303B-1H0EMFTR implements a fixed-frequency (2.0 MHz) PWM synchronous buck stage with automatic transition to PFM mode under light load to maintain ultra-low IQ, while its independent LDO stage uses internal compensation and delivers stable 3.3 V output with 137 mV typical dropout at 200 mA. The device employs separate shutdown controls (SHDN1 for buck, SHDN2 for LDO) and integrates undervoltage lockout (UVLO = 2.55 V nominal), overtemperature protection (TSHD = 165 °C), and short-circuit protection on both outputs.

Its power-good (PG) output is a push-pull signal referenced exclusively to VOUT2 regulation - asserting high when VOUT2 reaches ≥94% of nominal and deasserting low when falling below 92%, with 300 ms active timeout - making it suitable for processor reset sequencing where auxiliary rail integrity must be confirmed before system boot. The 10-pin DFN package features exposed thermal pad (EP) connected to AGND for enhanced thermal performance.

Key Specifications

Pinout & Package

TC1303B-1H0EMFTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for thermal dissipation and PCB area efficiency. The EP must be soldered to AGND for proper thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP16321-3302H/DC and TPS650361RGER, TC1303B-1H0EMFTR uniquely balances ultra-low IQ, integrated LDO noise performance, and minimal external component count in a 3×3 mm DFN - making it optimal for cost-sensitive, space-constrained portable instrumentation where analog rail purity and battery longevity are co-priorities.

Availability

TC1303B-1H0EMFTR is available at Aetrix Electronics and suitable for handheld medical instruments, USB-powered diagnostic devices, and industrial portable data loggers requiring stable component supply across multi-year production cycles.

Supply support for TC1303B-1H0EMFTR 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, with a focus on reliability, low-power innovation, and embedded control solutions.

TC1303B-1H0EMFTR belongs to Microchip's TC1303 series of dual-output PMICs, designed specifically for battery-powered portable electronics needing high-efficiency DC/DC conversion paired with low-noise linear regulation in minimal footprint.

FAQ

What output voltages does the TC1303B-1H0EMFTR deliver?

The TC1303B-1H0EMFTR delivers a fixed 1.8 V output on VOUT1 (buck regulator) and a fixed 3.3 V output on VOUT2 (LDO regulator). These values are factory-trimmed and specified with ±0.3% tolerance over temperature and load. The part number suffix "1H0" explicitly denotes the 1.8 V / 3.3 V configuration, and no external resistors are needed to set these voltages.

How does the power-good (PG) output of TC1303B-1H0EMFTR behave?

The TC1303B-1H0EMFTR features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of 3.3 V and deasserts low when falling below 92%, with a guaranteed 300 ms active timeout period. This behavior is distinct from TC1303A (open-drain, monitors buck) and TC1303C (open-drain, monitors both), confirming TC1303B-1H0EMFTR's role in LDO-dependent reset sequencing.

What is the thermal performance of TC1303B-1H0EMFTR in its DFN package?

In its 10-pin 3×3 mm DFN package with exposed pad, TC1303B-1H0EMFTR achieves a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the EP. This enables continuous 500 mA buck and 300 mA LDO operation at ambient temperatures up to +85°C without derating, provided the EP is soldered to AGND per Microchip layout guidelines.

Can TC1303B-1H0EMFTR operate from a single 3.7 V Li-ion cell?

Yes, TC1303B-1H0EMFTR supports input voltages from 2.7 V to 5.5 V, fully covering the discharge curve of a single-cell Li-ion (3.0–4.2 V). Its 137 mV typical dropout on the 3.3 V LDO allows stable operation down to 3.437 V input, and its 280 mV buck dropout at 500 mA ensures 1.8 V output remains regulated until input falls below ~2.08 V - well beyond the cell's useful voltage range.

What external components are mandatory for TC1303B-1H0EMFTR operation?

TC1303B-1H0EMFTR requires four mandatory external components: a 4.7 µH power inductor between LX and VOUT1; a 4.7 µF input capacitor between VIN1 and PGND; a 4.7 µF output capacitor between VOUT1 and PGND; and a 1 µF ceramic capacitor between VOUT2 and AGND. No feedback resistors or compensation networks are needed - both regulators are internally compensated and factory-configured for 1.8 V / 3.3 V.