Microchip Technology TC1303C-PA0EMF

Overview

TC1303C-PA0EMF 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 (VOUT1) and 3.3 V @ 300 mA (VOUT2) 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 for portable medical instruments and USB-powered devices.

For engineers reviewing the TC1303C-PA0EMF datasheet, TC1303C-PA0EMF pinout, TC1303C-PA0EMF application, or TC1303C-PA0EMF equivalent, key selection criteria include independent shutdown control per rail, simultaneous PG monitoring of buck and LDO outputs, 137 mV LDO dropout at 200 mA, internal compensation, and DFN/MSOP package compatibility with space-constrained battery-powered designs.

Technical Context

The TC1303C-PA0EMF implements a synchronous buck stage with PFM/PWM auto-transition and an independently controlled LDO stage, both internally compensated and sharing a common AGND reference. Its power-good circuit monitors regulation status of both VOUT1 and VOUT2 with a 300 ms delay, enabling reliable processor reset sequencing in dual-rail systems.

It supports adjustable (0.8–4.5 V) or fixed-output configurations for VOUT1 and standard fixed outputs (1.5 V, 1.8 V, 2.5 V, 3.3 V) for VOUT2. Shutdown logic is independent per regulator (SHDN1 for buck, SHDN2 for LDO), and UVLO triggers at 2.55 V nominal with 200 mV hysteresis.

Key Specifications

Pinout & Package

TC1303C-PA0EMF is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for thermal performance and board area efficiency in handheld applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65023BRSBT and RT8059ZSP, TC1303C-PA0EMF uniquely balances ultra-low IQ (65 µA), integrated LDO noise suppression, and compact DFN packaging-making it optimal for cost- and space-constrained dual-rail portable designs where analog integrity and battery longevity are co-priorities.

Availability

TC1303C-PA0EMF is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered test equipment, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for TC1303C-PA0EMF 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, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.

The TC1303 family is designed for space-constrained, battery-powered applications demanding efficient dual-voltage regulation-specifically targeting portable instrumentation, wearables, and USB peripherals where low IQ, small footprint, and robust power sequencing are essential.

FAQ

What output voltages does TC1303C-PA0EMF provide?

TC1303C-PA0EMF provides a fixed 1.8 V output on VOUT1 (buck) and a fixed 3.3 V output on VOUT2 (LDO), as indicated by the "PA0" and "EMF" suffixes in the part number. These values are factory-trimmed and do not require external feedback resistors. The device also supports adjustable VOUT1 (0.8–4.5 V) in other variants, but TC1303C-PA0EMF is configured for these specific fixed outputs.

How does the power-good (PG) function operate in TC1303C-PA0EMF?

In TC1303C-PA0EMF, the PG pin is an open-drain output that asserts low only when both VOUT1 and VOUT2 are within ±6% of their nominal values (i.e., 1.692–1.908 V and 3.102–3.498 V). It includes a built-in 300 ms delay after regulation is achieved, making it suitable for generating a clean processor reset signal. External pull-up is required to interface with standard logic inputs.

Can TC1303C-PA0EMF operate from a single-cell Li-ion battery?

Yes, TC1303C-PA0EMF supports input voltages from 2.7 V to 5.5 V, fully covering the discharge range of a single-cell Li-ion battery (typically 4.2 V down to 2.7 V). Its 137 mV LDO dropout at 200 mA ensures the 3.3 V rail remains regulated until battery voltage falls below ~3.44 V, maximizing usable battery capacity.

What thermal considerations apply to TC1303C-PA0EMF in DFN package?

TC1303C-PA0EMF in the 10-lead DFN package has a typical θJA of 41°C/W on a 4-layer board with internal ground plane and two vias under the exposed pad. To maintain junction temperature ≤125°C at full load, ambient must stay ≤85°C with adequate copper area and thermal vias tied to AGND. The device includes thermal shutdown at 165°C with 10°C hysteresis for fault protection.

Is TC1303C-PA0EMF pin-compatible with other TC1303 variants?

Yes, all TC1303A/B/C and TC1304 variants share identical 10-pin DFN and MSOP footprints and pinouts. TC1303C-PA0EMF is mechanically and electrically compatible with TC1303A/B variants in the same package, though functional differences exist-e.g., TC1303C monitors both outputs for PG, while TC1303A monitors only VOUT1. No PCB changes are required for drop-in replacement within the TC1303 family.