Microchip Technology TC1303A-ZS0EMF

Overview

TC1303A-ZS0EMF 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 the buck output only. It delivers 1.2V @ 500 mA and 2.5V @ 300 mA from a 2.7–5.5V input, features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature. It targets space-constrained portable electronics requiring tightly regulated dual-rail supplies.

For engineers reviewing the TC1303A-ZS0EMF datasheet, TC1303A-ZS0EMF pinout, TC1303A-ZS0EMF application, or TC1303A-ZS0EMF equivalent, key selection criteria include buck/LDO output voltage pairing, PG monitoring scope (buck-only), independent shutdown control, thermal performance in DFN-10, and compatibility with ceramic output capacitors (4.7 µF for buck, 1 µF for LDO).

Technical Context

The TC1303A-ZS0EMF implements a synchronous buck stage with integrated P/N-channel MOSFETs (R_DS(on) = 450 mΩ each), fixed 2.0 MHz switching frequency under heavy load, and automatic transition to PFM mode at light loads to maintain ultra-low IQ. Its LDO stage uses internal compensation and achieves 137 mV dropout at 200 mA, supporting standard fixed outputs without external components beyond a single 1 µF ceramic capacitor.

Power-good logic monitors only the buck output (VOUT1) with 94% threshold high, 89% threshold low, 300 ms delay, and open-drain output - consistent with TC1303A family specification. UVLO activates below 2.55 V (typ), and protection includes overtemperature shutdown at 165°C and cycle-by-cycle current limiting on both regulators.

Key Specifications

Pinout & Package

TC1303A-ZS0EMF is housed in a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP), optimized for high thermal conductivity and minimal PCB footprint. Pin 1 is SHDN2; pin 10 is PG. The 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 regulator applications.

Compared with TC1303B-ZS0EMF, TC1303A-ZS0EMF provides earlier reset assertion tied to processor core rail stability; versus TPS65023RSBR, it offers lower cost, smaller footprint, and simpler layout at the expense of flexibility and current headroom.

Availability

TC1303A-ZS0EMF is available at Aetrix Electronics and suitable for cellular phones, USB-powered IoT nodes, and handheld medical instruments requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned thermal robustness.

Supply support for TC1303A-ZS0EMF 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog, and power management solutions for industrial, automotive, and consumer markets.

The TC1303 family was designed to replace discrete buck-LDO combinations in space- and power-constrained portable electronics, emphasizing integration, low IQ, and ease of layout with internal compensation.

FAQ

What output voltages does the TC1303A-ZS0EMF provide?

The TC1303A-ZS0EMF delivers a fixed 1.2V output from its synchronous buck regulator (VOUT1) and a fixed 2.5V output from its low-dropout linear regulator (VOUT2). These values are laser-trimmed at wafer test and require no external resistors. The ZS0EMF suffix explicitly denotes this 1.2V/2.5V configuration per Microchip's part numbering scheme.

How does the power-good (PG) function operate on the TC1303A-ZS0EMF?

The TC1303A-ZS0EMF's PG pin is an open-drain output that monitors only the buck regulator output (VOUT1). It asserts low after VOUT1 reaches 94% of its nominal value and sustains the active state for ≥300 ms. The PG signal remains low until VOUT1 drops below 89% of nominal, providing a reliable, delayed reset indication for downstream processors.

Can the TC1303A-ZS0EMF operate from a single 3.3V input supply?

Yes, the TC1303A-ZS0EMF supports input voltages from 2.7V to 5.5V, making 3.3V fully valid. At 3.3V input, the 1.2V buck output maintains >90% efficiency across 100–500 mA loads, and the 2.5V LDO operates with 800 mV headroom (3.3V – 2.5V), well above its 137 mV typical dropout voltage - ensuring stable regulation even at full 300 mA load.

What is the thermal performance of the TC1303A-ZS0EMF in its DFN package?

In a standard 4-layer PCB with internal ground plane and two thermal vias under the exposed pad, the TC1303A-ZS0EMF (DFN-10) exhibits a θ_JA of 41°C/W. At maximum continuous power dissipation (≈1.5 W), junction temperature rise is ~62°C above ambient - comfortably within the –40°C to +125°C operating range when ambient stays ≤63°C, as verified in Microchip DS21949C.

Does the TC1303A-ZS0EMF require external compensation components?

No, the TC1303A-ZS0EMF integrates full compensation for both regulators. The buck stage uses internal Type-II compensation optimized for 4.7 µH inductors and 4.7 µF output capacitors; the LDO requires only a 1 µF ceramic capacitor on VOUT2. No external resistors, capacitors, or feedforward networks are needed for stable operation across temperature and load.