Microchip Technology TC1303C-ZA0EMFTR

Overview

TC1303C-ZA0EMFTR 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 both outputs. It delivers 1.8 V @ 500 mA (buck) and 3.3 V @ 300 mA (LDO) from a 2.7–5.5 V input, features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature for portable medical instruments and USB-powered devices.

For engineers reviewing the TC1303C-ZA0EMFTR datasheet, TC1303C-ZA0EMFTR pinout, TC1303C-ZA0EMFTR application, or TC1303C-ZA0EMFTR equivalent, key selection criteria include dual-rail sequencing capability, independent shutdown control per output, 137 mV LDO dropout at 200 mA, open-drain PG with 300 ms delay, and compatibility with 3×3 mm DFN-10 packaging for space-constrained battery-powered designs.

Technical Context

The TC1303C-ZA0EMFTR implements a synchronous buck stage with integrated P- and N-channel MOSFETs (R_DS(on) = 450 mΩ each), operating at 2.0 MHz nominal switching frequency and automatically transitioning between PWM and PFM modes under light load to maintain ultra-low IQ. Its LDO stage uses internal compensation and requires only a single 1 µF ceramic output capacitor.

Power-good logic monitors both VOUT1 and VOUT2 simultaneously with 94% high-threshold and 89% low-threshold hysteresis, generating an open-drain PG signal with 165 µs propagation delay and 262 ms active timeout period. UVLO engages below 2.55 V (typical), and thermal shutdown activates at 165°C with 10°C hysteresis.

Key Specifications

Pinout & Package

TC1303C-ZA0EMFTR is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed 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 MCP16311-H/ML and TPS65023BRSBR, TC1303C-ZA0EMFTR uniquely provides guaranteed dual-rail PG monitoring with zero external components, lowest IQ in its class, and DFN-10 footprint ideal for compact portable designs where simplicity and long battery life are prioritized over programmability.

Availability

TC1303C-ZA0EMFTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-C powered peripherals, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for TC1303C-ZA0EMFTR 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 was designed specifically for space- and power-constrained portable electronics needing tightly regulated dual-rail supplies with minimal external components and robust fault protection.

FAQ

What output voltages does the TC1303C-ZA0EMFTR provide?

The TC1303C-ZA0EMFTR is a fixed-output variant delivering 1.8 V from its buck regulator (VOUT1) and 3.3 V from its LDO (VOUT2). These values are laser-trimmed at wafer test and do not require external feedback resistors-ensuring ±0.3% output tolerance across temperature and load conditions. The TC1303C-ZA0EMFTR datasheet confirms these are factory-set values for this specific part number.

How does the power-good (PG) function operate on the TC1303C-ZA0EMFTR?

The TC1303C-ZA0EMFTR's PG pin is an open-drain output that asserts low only when *both* VOUT1 and VOUT2 are within 94% to 96% of their nominal values. It includes a 300 ms active timeout period and 165 µs propagation delay. This dual-rail monitoring ensures system reset occurs only after stable core *and* I/O supplies are established-critical for reliable boot in microcontroller-based devices using TC1303C-ZA0EMFTR.

Can the TC1303C-ZA0EMFTR be used with a single input source for both VIN1 and VIN2?

Yes-the TC1303C-ZA0EMFTR is explicitly designed for shared-input operation: VIN1 and VIN2 must be connected together with short, low-impedance traces as stated in the datasheet Note 8. This simplifies PCB layout and eliminates the need for separate input filtering. The device internally isolates buck and LDO power paths, so coupling between rails remains negligible even under dynamic load steps on either output.

What is the thermal performance of the TC1303C-ZA0EMFTR in its DFN-10 package?

The TC1303C-ZA0EMFTR in the 3×3 mm DFN-10 package achieves a typical θ_JA of 41°C/W on a 4-layer board with internal ground plane and two thermal vias under the exposed pad. At full 500 mA buck + 300 mA LDO load with 5 V input, junction temperature rise remains below 45°C above ambient-well within the –40°C to +125°C operating range. This enables fanless operation in sealed enclosures.

Does the TC1303C-ZA0EMFTR support independent enable/disable of its two outputs?

Yes-the TC1303C-ZA0EMFTR provides fully independent control via SHDN1 (buck shutdown) and SHDN2 (LDO shutdown) pins. Each is active-low with TTL-compatible thresholds (VIH > 45% VIN, VIL < 15% VIN). This allows precise sequencing-for example, enabling the LDO first to power bias circuitry before bringing up the buck regulator for the processor core-without requiring external timing components or firmware coordination.