Microchip Technology TC1304-ZI0EUNTR

Overview

TC1304-ZI0EUNTR 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, 65 µA typical quiescent current, and operation from -40°C to +125°C junction temperature. It delivers core and bias voltages for portable processors in USB-powered devices.

For engineers reviewing the TC1304-ZI0EUNTR datasheet, TC1304-ZI0EUNTR pinout, TC1304-ZI0EUNTR application, or TC1304-ZI0EUNTR equivalent, key selection criteria include output sequencing control, dual-regulator efficiency trade-offs, PG monitoring of both outputs, thermal performance in 3×3 DFN, and compatibility with 1 µF LDO output capacitance.

Technical Context

The TC1304-ZI0EUNTR implements independent shutdown logic with a single SHDN input that initiates controlled sequencing: LDO enables first, then buck regulator after internal timing. Its buck stage operates at fixed 2.0 MHz PWM under heavy load and transitions automatically to PFM mode at light loads to maintain ultra-low IQ.

The LDO features 137 mV typical dropout at 200 mA and is internally compensated for stability with only a 1 µF ceramic output capacitor. Power-good monitoring covers both VOUT1 and VOUT2 simultaneously with 94%–96% regulation thresholds and 2% hysteresis, asserting after a fixed 300 ms delay.

Key Specifications

Pinout & Package

TC1304-ZI0EUNTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for high-power-density portable designs. Pin functions are electrically and thermally validated per Microchip DS21949C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP16321-330I/MS and TPS65023BRSBR, TC1304-ZI0EUNTR uniquely combines guaranteed LDO-first sequencing, dual-output PG assertion, and 3×3 DFN packaging - making it optimal for space-constrained, battery-sensitive applications requiring deterministic power-up order.

Availability

TC1304-ZI0EUNTR is available at Aetrix Electronics and suitable for USB-powered portable instruments, industrial handheld terminals, and low-power edge AI nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TC1304-ZI0EUNTR 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, headquartered in Chandler, Arizona, with global design and manufacturing operations.

TC1304-ZI0EUNTR belongs to Microchip's TC1303/TC1304 dual-regulator family, engineered specifically for portable and battery-powered systems needing tightly coordinated, low-quiescent dual-rail power with minimal external components.

FAQ

What is the function of the SHDN pin on TC1304-ZI0EUNTR?

The SHDN pin on TC1304-ZI0EUNTR is an active-low input that initiates sequenced startup (LDO first, then buck) and synchronized shutdown. When pulled high (>45% of VIN), it enables both regulators in order; when pulled low (<15% of VIN), it disables both. This sequencing prevents backfeed and ensures safe power-up of dependent circuitry - a defining feature distinguishing TC1304-ZI0EUNTR from TC1303 variants.

Does TC1304-ZI0EUNTR support adjustable output voltage on the buck regulator?

Yes, TC1304-ZI0EUNTR supports adjustable buck output from 0.8 V to 4.5 V using an external resistor divider connected to the VFB1/VOUT1 pin. The internal reference is 0.8 V ±2.5%, and the device is fully compatible with standard feedback configurations. Fixed-output versions (e.g., 1.2 V, 1.8 V) are also available, but TC1304-ZI0EUNTR's marking indicates it is configured for adjustable operation.

How does the power-good (PG) output behave on TC1304-ZI0EUNTR?

The PG output on TC1304-ZI0EUNTR is an open-drain signal that asserts low only after both VOUT1 and VOUT2 reach and sustain 94–96% of their target voltages for 300 ms. It monitors regulation of both regulators simultaneously - unlike TC1303A (buck-only) or TC1303B (LDO-only). This dual-rail validation makes TC1304-ZI0EUNTR ideal for systems where firmware must wait for full subsystem readiness.

What thermal performance can be expected from TC1304-ZI0EUNTR in its DFN package?

In its 10-pin 3×3 mm DFN package with exposed pad (EP), TC1304-ZI0EUNTR achieves a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the EP. This enables continuous 500 mA buck + 300 mA LDO operation at ambient temperatures up to +85°C without forced airflow - verified per Microchip DS21949C characterization.

Can TC1304-ZI0EUNTR operate with a single input source for both VIN1 and VIN2?

Yes, TC1304-ZI0EUNTR is designed to operate with a common 2.7–5.5 V input applied to both VIN1 (buck input) and VIN2 (LDO input). The datasheet explicitly states "VIN1 and VIN2 are supplied by the same input source" and recommends routing them together with short, low-impedance traces. This simplifies power architecture in single-rail battery or USB-supplied systems while maintaining independent regulation and sequencing.