Microchip Technology TC1303B-SP0EMFTR

Overview

TC1303B-SP0EMFTR 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 94% typical regulation accuracy, 137 mV dropout at 200 mA for VOUT2, and operates across –40°C to +125°C junction temperature. It targets portable battery-powered systems requiring tightly sequenced, low-noise dual-rail supplies - such as USB-powered medical instruments and handheld PDAs.

For engineers reviewing the TC1303B-SP0EMFTR datasheet, TC1303B-SP0EMFTR pinout, TC1303B-SP0EMFTR application, or TC1303B-SP0EMFTR equivalent, key selection criteria include its LDO-monitored PG output, independent SHDN2 control, 2.0 MHz fixed-frequency PWM/PFM transition, 65 µA total quiescent current, and compatibility with 1 µF ceramic output capacitors on both rails.

Technical Context

The TC1303B-SP0EMFTR implements a synchronous buck stage with integrated P- and N-channel MOSFETs (R_DS(on) = 450 mΩ each), operating at 2.0 MHz under heavy load and automatically transitioning to PFM mode at light loads to maintain ultra-low IQ. Its LDO stage features internal compensation and supports standard fixed outputs (1.5V/1.8V/2.5V/3.3V) with ±0.3% output voltage tolerance.

Power-good logic is dedicated to VOUT2 regulation, asserting a push-pull PG signal when VOUT2 reaches ≥94% of nominal and deasserting below 92%, with 300 ms delay used for processor reset timing. UVLO (2.55 V typ), thermal shutdown (165°C), and overcurrent protection are embedded across both regulators.

Key Specifications

Pinout & Package

TC1303B-SP0EMFTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for high-density portable PCB layouts. Pin 1 is SHDN2 (active-high LDO enable), Pin 3 is VOUT2 (LDO output), Pin 4 is PG (push-pull power-good), and Pin 5 is AGND (analog ground reference).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP16321-330I/MS and TPS65023RGZR, TC1303B-SP0EMFTR delivers verified dual-rail integration in a 3×3 mm DFN with LDO-specific PG - offering optimal balance of miniaturization, simplicity, and guaranteed reset timing for cost-sensitive portable designs.

Availability

TC1303B-SP0EMFTR is available at Aetrix Electronics and suitable for USB-powered medical devices, handheld PDAs, and portable computers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TC1303B-SP0EMFTR 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 microcontroller, mixed-signal, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The TC1303 family was designed specifically for space-constrained, battery-operated portable electronics needing highly integrated, low-quiescent dual-rail power conversion with deterministic power-good signaling.

FAQ

What output voltages does the TC1303B-SP0EMFTR provide?

The TC1303B-SP0EMFTR provides two fixed output voltages: VOUT1 = 1.8 V (buck regulator) and VOUT2 = 3.3 V (LDO regulator), as indicated by the "SP0" suffix in the part number. Both outputs are factory-configured and require no external feedback resistors. The LDO output is monitored by the power-good (PG) pin, which asserts when VOUT2 reaches ≥94% of 3.3 V.

How does the power-good (PG) function work on the TC1303B-SP0EMFTR?

The TC1303B-SP0EMFTR's PG pin is a push-pull output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 rises above 94% of its nominal value (3.102 V for 3.3 V output) and deasserts when VOUT2 falls below 92% (3.036 V), with built-in 300 ms delay used for processor reset timing. This differs from TC1303A (monitors buck) and TC1303C (monitors both).

Can the TC1303B-SP0EMFTR operate from a single Li-ion battery?

Yes - the TC1303B-SP0EMFTR supports an input voltage range of 2.7 V to 5.5 V, fully covering the discharge curve of a single-cell Li-ion battery (typically 4.2 V fully charged down to ~2.8 V). Its 137 mV LDO dropout at 200 mA ensures stable 3.3 V output until input drops below ~3.43 V, and its 280 mV buck dropout at 500 mA maintains 1.8 V output down to ~2.08 V input.

What is the thermal performance of the TC1303B-SP0EMFTR in its DFN package?

In the 10-lead 3×3 mm DFN package with exposed pad, the TC1303B-SP0EMFTR has 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. Its thermal shutdown activates at 165°C with 10°C hysteresis, and it is rated for continuous operation up to +125°C junction temperature - making it suitable for thermally dense portable enclosures.

Does the TC1303B-SP0EMFTR require external compensation components?

No - both the buck regulator and LDO in the TC1303B-SP0EMFTR are internally compensated. The buck stage uses integrated MOSFETs and fixed-frequency control to eliminate need for external loop compensation. The LDO requires only a 1 µF ceramic output capacitor on VOUT2 and does not need additional RC networks or feedforward capacitors, simplifying layout and reducing BOM count.