Microchip Technology TC1304-ZI0EUN

Overview

TC1304-ZI0EUN 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 junction temperature. It delivers fixed 1.8V/3.3V outputs in a 10-pin 3×3 mm DFN package and is used in portable medical instruments and USB-powered devices requiring tightly coordinated voltage rails.

For engineers reviewing the TC1304-ZI0EUN datasheet, TC1304-ZI0EUN pinout, TC1304-ZI0EUN application, or TC1304-ZI0EUN equivalent, this page provides verified functional specifications, sequencing behavior, thermal performance, and real-world design implications - including PG open-drain logic, independent shutdown control, and 2.0 MHz fixed-frequency PWM-to-PFM transition under light load.

Technical Context

The TC1304-ZI0EUN implements output sequencing via a dedicated SHDN input that first enables VOUT2 (LDO), then VOUT1 (buck) on power-up, and reverses order during shutdown. Its power-good (PG) output monitors both regulators and asserts after 300 ms only when both outputs reach ≥94% of nominal voltage.

Internally compensated architecture eliminates external compensation components for both regulators. The buck stage uses synchronous MOSFETs (R_DS(on) = 450 mΩ each), operates at 2.0 MHz (±20%), and transitions automatically between PWM and PFM modes; the LDO achieves 137 mV dropout at 200 mA with 62 dB PSRR at ≤100 Hz.

Key Specifications

Pinout & Package

TC1304-ZI0EUN is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. Pin 1 is SHDN; pin 10 is AGND. The package supports high-power-density layouts with θ_JA = 41°C/W on a 4-layer board with thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TC1303C-ZI0EUN and TPS65023RGZR, TC1304-ZI0EUN uniquely integrates sequencing control and open-drain PG with minimal external components - reducing layout complexity and validation effort for portable medical and USB-class devices.

Availability

TC1304-ZI0EUN is available at Aetrix Electronics and suitable for USB-powered portable instruments, handheld medical sensor hubs, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TC1304-ZI0EUN 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 devices, and power management ICs, with broad industrial and automotive qualification coverage.

The TC1303/TC1304 family was designed specifically for space-constrained, battery-operated portable electronics requiring dual regulated rails, low quiescent current, and robust power sequencing - targeting medical, consumer, and industrial edge devices.

FAQ

What output voltages does the TC1304-ZI0EUN provide?

The TC1304-ZI0EUN delivers fixed 1.8 V on VOUT1 (buck) and fixed 3.3 V on VOUT2 (LDO), as indicated by the "ZI0EUN" suffix per Microchip's ordering code. These values are factory-trimmed and require no external resistors; VFB1/VOUT1 pin is internally connected to the 1.8 V output node.

How does the power-good (PG) function behave on the TC1304-ZI0EUN?

The TC1304-ZI0EUN features an open-drain PG output that remains low until both VOUT1 and VOUT2 reach ≥94% of their nominal values, then asserts high after a fixed 300 ms delay. This behavior is confirmed in DS21949C-page 9 and matches the TC1303C/TC1304 PG specification - not the push-pull variant used in TC1303B.

Does the TC1304-ZI0EUN support independent shutdown of its two regulators?

No - unlike TC1303 variants with SHDN1/SHDN2 pins, the TC1304-ZI0EUN uses a single SHDN pin to initiate coordinated sequencing: VOUT2 enables first, followed by VOUT1 on startup, and reversed on shutdown. Independent control is not supported per the functional block diagram on DS21949C-page 4.

What is the thermal performance of the TC1304-ZI0EUN in its DFN package?

The TC1304-ZI0EUN in 10-lead DFN has a typical junction-to-ambient thermal resistance (θ_JA) of 41°C/W on a 4-layer PCB with internal ground plane and ≥4 thermal vias under the EP pad. This enables continuous 500 mA buck + 300 mA LDO operation at ambient temperatures up to +85°C without derating.

Can the TC1304-ZI0EUN operate from a single 3.6 V Li-ion cell?

Yes - the TC1304-ZI0EUN supports input voltages from 2.7 V to 5.5 V on both VIN1 and VIN2. With 3.3 V LDO output and 137 mV dropout, it maintains regulation down to VIN2 = 3.437 V; combined with 280 mV buck dropout at 500 mA, it sustains both outputs across the full discharge curve of a single-cell Li-ion battery.