Microchip Technology TC1303B-ZG0EMFTR

Overview

TC1303B-ZG0EMFTR 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 focused on the LDO output. It delivers 1.8V/500 mA and 3.3V/300 mA outputs, operates from 2.7–5.5V 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-ZG0EMFTR datasheet, TC1303B-ZG0EMFTR pinout, TC1303B-ZG0EMFTR application, or TC1303B-ZG0EMFTR equivalent, key selection criteria include LDO-monitored PG functionality, 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 compatibility with 1 µF ceramic output capacitors on VOUT2.

Technical Context

The TC1303B-ZG0EMFTR implements a synchronous buck stage with integrated P-channel and N-channel MOSFETs (R_DS(on) = 450 mΩ each), operating at a fixed 2.0 MHz switching frequency under heavy load and transitioning automatically to pulse-frequency modulation (PFM) at light loads to maintain ultra-low quiescent current. Its LDO stage uses internal compensation and achieves 25 ppm/°C temperature coefficient with 62 dB PSRR at ≤100 Hz.

Power-good logic monitors only the LDO output (VOUT2), asserting a push-pull PG signal when VOUT2 reaches ≥94% of nominal and deasserting below 92%, with 300 ms delay built into the active timeout period. Undervoltage lockout triggers at 2.55 V (typical) with 200 mV hysteresis, and thermal shutdown activates at 165°C with 10°C hysteresis.

Key Specifications

Pinout & Package

TC1303B-ZG0EMFTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for high-power-density portable designs. The package supports θ_JA = 41°C/W on a 4-layer board 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 regulator applications.

Compared with TPS65023RSBR and RT8059ZSP, TC1303B-ZG0EMFTR uniquely provides LDO-monitored power-good with push-pull drive, enabling simpler reset circuitry for systems where auxiliary rail integrity dictates system readiness - a distinction critical in portable medical and USB-peripheral designs.

Availability

TC1303B-ZG0EMFTR is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered test equipment, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TC1303B-ZG0EMFTR 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for embedded control applications.

The TC1303 family was designed specifically for space-constrained portable electronics requiring highly integrated, low-quiescent-current dual-rail power solutions with flexible sequencing and precise rail monitoring.

FAQ

What output voltages does the TC1303B-ZG0EMFTR provide?

The TC1303B-ZG0EMFTR is a fixed-output variant delivering 1.8 V from its synchronous buck regulator (VOUT1) and 3.3 V from its low-dropout linear regulator (VOUT2). These values are factory-set and do not require external feedback resistors. Both outputs are internally compensated and rated for 500 mA and 300 mA maximum load currents respectively, with tight ±0.3% tolerance over temperature and line variations.

How does the power-good (PG) function operate in TC1303B-ZG0EMFTR?

In TC1303B-ZG0EMFTR, the power-good (PG) output is a push-pull signal that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of its nominal value and deasserts low when VOUT2 falls below 92%. A built-in 300 ms active timeout ensures stable reset assertion during startup. This behavior is specific to the TC1303B variant - other members of the TC1303 family monitor different rails.

Can TC1303B-ZG0EMFTR operate from a single Li-ion cell?

Yes, TC1303B-ZG0EMFTR supports input voltages from 2.7 V to 5.5 V, making it compatible with single-cell Li-ion batteries (2.7–4.2 V nominal). Its 137 mV typical dropout voltage on the LDO ensures 3.3 V output remains regulated even as the battery discharges to 3.437 V (3.3 V + 137 mV), and the buck regulator maintains regulation down to 2.7 V input for 1.8 V output.

What is the thermal performance of TC1303B-ZG0EMFTR in its DFN package?

TC1303B-ZG0EMFTR in the 10-pin 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. Its thermal shutdown activates at 165°C with 10°C hysteresis, and the device is rated for continuous operation from -40°C to +125°C junction temperature.

Does TC1303B-ZG0EMFTR require external compensation components?

No, TC1303B-ZG0EMFTR features both regulators - the 500 mA synchronous buck and the 300 mA LDO - as internally compensated. This eliminates the need for external compensation capacitors or resistors on either feedback loop, reducing bill-of-materials count, PCB area, and design validation effort. Only standard input/output capacitors and the buck inductor are required for full operation.