Microchip Technology TC1303C-ZS0EUNTR

Overview

TC1303C-ZS0EUNTR 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 0.8–4.5 V adjustable or fixed VOUT1 (e.g., 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V) and fixed VOUT2 (1.5 V, 1.8 V, 2.5 V, 3.3 V), operates from 2.7–5.5 V input, and supports -40°C to +125°C junction temperature - ideal for battery-powered portable computing and USB-powered instrumentation.

For engineers reviewing the TC1303C-ZS0EUNTR datasheet, TC1303C-ZS0EUNTR pinout, TC1303C-ZS0EUNTR application, or TC1303C-ZS0EUNTR equivalent, key selection considerations include independent shutdown control for each regulator, 300 ms programmable power-good delay for processor reset coordination, 65 µA typical total quiescent current, 2.0 MHz fixed-frequency PWM operation under heavy load, and compatibility with 1 µF ceramic output capacitors on the LDO rail.

Technical Context

The TC1303C-ZS0EUNTR implements a synchronous buck topology with integrated P- and N-channel MOSFETs (R_DS(on) = 450 mΩ each), automatic transition between PWM and PFM modes to maintain efficiency at light loads, and internal compensation for both regulators. Its power-good circuit monitors regulation status of both VOUT1 and VOUT2 simultaneously with 94% high-threshold and 89% low-threshold hysteresis.

It features undervoltage lockout (UVLO) at 2.55 V nominal with 200 mV hysteresis, overtemperature protection triggering at 165°C with 10°C hysteresis, and short-circuit protection on both outputs. The device supports independent enable control via SHDN1 (buck) and SHDN2 (LDO), with logic thresholds defined as VIH ≥ 45% VIN and VIL ≤ 15% VIN.

Key Specifications

Pinout & Package

TC1303C-ZS0EUNTR is packaged in a 10-pin 3×3 mm DFN (exposed pad) with thermal performance θ_JA = 41°C/W on a 4-layer board. Pin functions are validated per DS21949C-page 19 and match the TC1303C variant pin mapping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65023BRSBR and RT8059ZSP, TC1303C-ZS0EUNTR uniquely balances ultra-low quiescent current, independent regulator control, and integrated LDO noise suppression - making it optimal for battery-constrained mixed-signal portable devices where power sequencing and analog integrity are critical.

Availability

TC1303C-ZS0EUNTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TC1303C-ZS0EUNTR 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, analog, and Flash-IP solutions, serving industrial, automotive, and consumer markets with high-reliability semiconductor products.

The TC1303 family is designed for cost-sensitive, space-constrained portable electronics requiring dual-voltage power delivery with minimal external components and robust thermal performance.

FAQ

What output voltages does the TC1303C-ZS0EUNTR support?

The TC1303C-ZS0EUNTR supports an adjustable buck output (VOUT1) from 0.8 V to 4.5 V via external resistive divider, or fixed options including 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V. The LDO output (VOUT2) is fixed at 1.5 V, 1.8 V, 2.5 V, or 3.3 V - with TC1303C-ZS0EUNTR specifically configured for 1.8 V VOUT1 and 3.3 V VOUT2 per Microchip's part numbering convention (ZS = 1.8 V/3.3 V).

How does the power-good (PG) function operate in TC1303C-ZS0EUNTR?

The TC1303C-ZS0EUNTR'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, with a fixed 300 ms delay after regulation is achieved. This dual-rail monitoring ensures safe processor initialization - unlike TC1303A (buck-only) or TC1303B (LDO-only) variants - and matches the exact behavior documented in DS21949C for the TC1303C family.

Can TC1303C-ZS0EUNTR operate from a single-cell Li-ion battery?

Yes, TC1303C-ZS0EUNTR operates from 2.7 V to 5.5 V input, fully covering the discharge range of a single-cell Li-ion battery (2.7–4.2 V). Its 2.55 V UVLO threshold with 200 mV hysteresis prevents erratic startup during battery sag, and the 137 mV LDO dropout enables stable 3.3 V output even at end-of-discharge (e.g., 3.43 V input @ 200 mA load).

What is the thermal performance of TC1303C-ZS0EUNTR in its DFN package?

TC1303C-ZS0EUNTR in the 10-pin 3×3 mm DFN package achieves θ_JA = 41°C/W on a standard 4-layer PCB with internal ground plane and two thermal vias under the exposed pad. This allows continuous 500 mA buck output at up to +85°C ambient without derating - verified by Microchip's thermal characterization in DS21949C-page 10 - and supports operation up to +125°C junction temperature with appropriate board-level heatsinking.

Does TC1303C-ZS0EUNTR require external compensation components?

No, TC1303C-ZS0EUNTR features fully internal compensation for both the buck regulator and LDO, eliminating the need for external RC networks or type-II/type-III compensators. This simplifies design, reduces bill-of-materials cost, and improves layout robustness - a key differentiator versus competing dual-output PMICs that mandate external compensation for stability across load and input conditions.