Microchip Technology TC1303C-ZA0EMF

Overview

TC1303C-ZA0EMF 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 buck output (e.g., 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V) and fixed LDO outputs (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 portable medical instruments requiring stable dual-rail biasing.

For engineers reviewing the TC1303C-ZA0EMF datasheet, TC1303C-ZA0EMF pinout, TC1303C-ZA0EMF application, or TC1303C-ZA0EMF equivalent, key selection criteria include independent shutdown control per rail, 300 ms programmable power-good delay for processor reset coordination, 65 µA typical quiescent current in active dual-output mode, and compatibility with 1 µF ceramic output capacitors on both rails to minimize board area.

Technical Context

The TC1303C-ZA0EMF implements a fixed-frequency 2.0 MHz PWM synchronous buck stage with automatic transition to PFM at light loads, achieving >90% efficiency at heavy load while minimizing no-load current draw. Its LDO stage features internal compensation and 137 mV typical dropout at 200 mA, enabling high PSRR (62 dB ≤100 Hz) and low noise (1.8 µV/√Hz).

Power-good logic monitors both VOUT1 and VOUT2 simultaneously with 94% threshold high and 89% threshold low, 2% hysteresis, and a guaranteed 140–560 ms active timeout window - ensuring robust reset assertion during brown-out recovery across temperature.

Key Specifications

Pinout & Package

TC1303C-ZA0EMF is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for high-power-density portable designs. Pin 11 (EP) must be soldered to AGND for thermal and electrical integrity.

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-ZA0EMF uniquely balances dual-rail integration, ultra-low IQ, and compact DFN packaging - making it optimal for space-constrained, battery-sensitive applications where one buck and one LDO suffice.

Availability

TC1303C-ZA0EMF is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, industrial handheld terminals, and low-power IoT edge sensors requiring stable component supply across extended product lifecycles.

Supply support for TC1303C-ZA0EMF 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 was designed specifically for portable and battery-operated systems needing highly integrated, low-quiescent-current dual-rail power management - emphasizing small size, thermal efficiency, and robust fault handling in harsh environments.

FAQ

What output voltages does TC1303C-ZA0EMF support?

TC1303C-ZA0EMF supports an adjustable buck output from 0.8 V to 4.5 V (via external resistive divider on VFB1), plus standard fixed buck outputs of 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V. The LDO output is fixed at 1.5 V, 1.8 V, 2.5 V, or 3.3 V - with TC1303C-ZA0EMF specifically configured for 1.8 V buck and 3.3 V LDO per its part number suffix.

How does the power-good (PG) function operate in TC1303C-ZA0EMF?

In TC1303C-ZA0EMF, the PG pin is an open-drain output that asserts low only when both VOUT1 (buck) and VOUT2 (LDO) are within 94% to 96% of their nominal values. It includes a 300 ms delay before assertion and a 140–560 ms timeout window, ensuring reliable processor reset coordination during power-up and brown-out events.

Can TC1303C-ZA0EMF operate from a single 3.7 V Li-ion cell?

Yes - TC1303C-ZA0EMF operates from 2.7 V to 5.5 V input, fully compatible with discharged (3.0 V) to fully charged (4.2 V) single-cell Li-ion sources. Its 137 mV LDO dropout at 200 mA allows 3.3 V LDO output even at 3.437 V input, and buck efficiency exceeds 88% at 3.6 V input and 100 mA load.

What is the thermal performance of TC1303C-ZA0EMF in the DFN package?

TC1303C-ZA0EMF in its 10-pin 3×3 mm DFN package has a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer PCB with internal ground plane and two vias under the exposed pad. This enables continuous 500 mA buck + 300 mA LDO operation up to +85°C ambient without derating when EP is properly soldered to AGND.

Does TC1303C-ZA0EMF require external compensation components?

No - both the buck regulator and LDO in TC1303C-ZA0EMF are internally compensated. Only standard input/output ceramic capacitors (4.7 µF on buck input/output, 1 µF on LDO output) and a 4.7 µH inductor are required for stable operation, simplifying design and reducing bill-of-materials count.