Microchip Technology TC1304-ZA0EUN

Overview

TC1304-ZA0EUN 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 sequenced startup/shutdown, 300 ms power-good delay, and operation over –40°C to +125°C. It delivers fixed 3.3V on VOUT1 and 2.5V on VOUT2, targeting battery-powered portable electronics requiring tightly coordinated voltage rails.

For engineers reviewing the TC1304-ZA0EUN datasheet, TC1304-ZA0EUN pinout, TC1304-ZA0EUN application, or TC1304-ZA0EUN equivalent, key selection criteria include output sequencing behavior, PG monitoring of both regulators, 65 µA typical quiescent current, 2.0 MHz switching frequency, and DFN-10 package compatibility with space-constrained PCB layouts.

Technical Context

The TC1304-ZA0EUN implements independent control logic for buck and LDO outputs with integrated sequencing circuitry that enforces defined power-up and power-down order-ensuring VOUT2 (LDO) ramps before VOUT1 (buck) during startup and reverses sequence at shutdown. Its power-good generator monitors both outputs simultaneously with a 300 ms active timeout and 165 µs response delay.

It uses a fixed-frequency 2.0 MHz PWM architecture for heavy loads and transitions automatically to PFM mode under light load to maintain 65 µA total IQ. The buck stage features internal high-side and low-side MOSFETs (R_DS(on) = 450 mΩ each), while the LDO achieves 137 mV dropout at 200 mA with no external compensation required.

Key Specifications

Pinout & Package

TC1304-ZA0EUN is housed in a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP) connected to AGND. Pin numbering follows standard DFN orientation (pin 1 top-left, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP16321-3325I/MC and TPS65023RGZR, TC1304-ZA0EUN uniquely combines dual-rail sequencing, simultaneous PG monitoring, and ultra-low IQ in a 3×3 mm DFN-making it optimal for space-constrained, battery-sensitive dual-rail applications where deterministic power-up order is mandatory.

Availability

TC1304-ZA0EUN is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered test equipment, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TC1304-ZA0EUN 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 microcontrollers, analog components, and power management ICs, serving industrial, automotive, and consumer markets with high-reliability semiconductor solutions.

The TC1303/TC1304 product line was designed specifically for portable and battery-operated devices needing compact, efficient dual-rail power with intelligent sequencing and robust fault monitoring-targeting applications where size, efficiency, and power integrity are co-primary constraints.

FAQ

What output voltages does the TC1304-ZA0EUN provide?

The TC1304-ZA0EUN provides fixed 3.3V on its buck regulator output (VOUT1) and fixed 2.5V on its LDO output (VOUT2). These values are factory-trimmed and do not require external resistive feedback networks. Both outputs maintain ±0.3% tolerance across load, line, and temperature per the DS21949C datasheet specifications.

Does the TC1304-ZA0EUN support independent enable control for each regulator?

No-the TC1304-ZA0EUN uses a single SHDN pin to initiate sequenced startup and shutdown of both regulators. Unlike the TC1303 variants, it does not offer separate SHDN1/SHDN2 inputs. Activation of SHDN enables VOUT2 first, then VOUT1; deactivation reverses this order to prevent backfeeding.

How is the power-good (PG) signal configured on the TC1304-ZA0EUN?

The TC1304-ZA0EUN features an open-drain PG output that asserts low only when both VOUT1 (3.3V) and VOUT2 (2.5V) are within 94–96% of their nominal values. It includes a 300 ms active timeout period and a 165 µs response delay, meeting processor reset timing requirements without external RC networks.

What package type and thermal characteristics apply to the TC1304-ZA0EUN?

The TC1304-ZA0EUN is supplied in a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP). Its typical junction-to-ambient thermal resistance (θ_JA) is 41°C/W on a 4-layer board with internal ground plane and two thermal vias under the EP-enabling full 500 mA buck output capability at +85°C ambient.

Can the TC1304-ZA0EUN operate from a single 3.6V Li-ion cell?

Yes-the TC1304-ZA0EUN supports input voltages from 2.7V to 5.5V on both VIN1 and VIN2. With VOUT2 = 2.5V and 137 mV dropout, it regulates fully down to VIN2 = 2.637V, making it compatible with discharged 3.6V Li-ion cells (down to ~2.8V typical cutoff). The buck stage maintains >85% efficiency at 3.6V input and 500 mA load.