Microchip Technology TC1304-ZI0EMF

Overview

TC1304-ZI0EMF 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 tightly regulated core and bias voltages for portable processors in USB-powered devices.

For engineers reviewing the TC1304-ZI0EMF datasheet, TC1304-ZI0EMF pinout, TC1304-ZI0EMF application, or TC1304-ZI0EMF 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 LDO dropout at 200 mA.

Technical Context

The TC1304-ZI0EMF implements independent shutdown logic with a single SHDN input that initiates controlled sequencing: LDO enables first, then buck regulator after internal timing; during shutdown, buck disables before LDO. Its buck stage operates at fixed 2.0 MHz PWM under heavy load and transitions automatically to PFM mode at light loads to maintain 65 µA total IQ.

Power-good monitoring is open-drain and asserts only when both VOUT1 and VOUT2 remain within ±6% of regulation for ≥300 ms; the LDO uses internal compensation and requires only a 1 µF ceramic output capacitor, while the buck stage integrates P- and N-channel MOSFETs with 450 mΩ R_DS(on) each.

Key Specifications

Pinout & Package

TC1304-ZI0EMF is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. The package supports 41°C/W junction-to-ambient thermal resistance on a 4-layer PCB with internal ground plane and two vias under the EP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TC1303C-ZI0EMF and TPS65023BRSBR, TC1304-ZI0EMF uniquely combines sequencing control, ultra-low 65 µA IQ, and open-drain dual-output PG in a 3×3 mm DFN - making it optimal for space-constrained, battery-sensitive portable designs requiring deterministic power-up behavior.

Availability

TC1304-ZI0EMF is available at Aetrix Electronics and suitable for USB-powered devices, handheld medical instruments, and industrial handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TC1304-ZI0EMF 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/TC1304 product line was designed specifically for portable and battery-operated applications demanding high integration, low quiescent current, and robust dual-rail power sequencing in minimal footprint.

FAQ

What is the function of the SHDN pin on the TC1304-ZI0EMF?

The SHDN pin on the TC1304-ZI0EMF is an active-low input that initiates sequenced power-up (LDO first, then buck regulator) and sequenced shutdown (buck first, then LDO). When pulled high (>45% of VIN), it enables both regulators in order; when pulled low (<15% of VIN), it disables them in reverse order to prevent backfeeding and ensure safe state transitions. This behavior is intrinsic to the TC1304-ZI0EMF and differs from TC1303 variants.

Does the TC1304-ZI0EMF support adjustable output voltages?

Yes, the TC1304-ZI0EMF supports adjustable buck output voltage from 0.8 V to 4.5 V via external resistor divider connected to the VFB1/VOUT1 pin. The LDO output is fixed at factory-set values (1.5 V, 1.8 V, 2.5 V, or 3.3 V); the specific voltage for TC1304-ZI0EMF is indicated by the suffix 'ZI0', which corresponds to 1.8 V for VOUT2 and 3.3 V for VOUT1 per Microchip's ordering matrix.

How does the power-good (PG) output behave on the TC1304-ZI0EMF?

The PG output on the TC1304-ZI0EMF is an open-drain signal that goes low only when both VOUT1 and VOUT2 remain within 94–96% of their nominal values for ≥300 ms. It remains asserted low until either output deviates by more than 6%, providing a robust system reset condition. Unlike TC1303B, TC1304-ZI0EMF does not offer push-pull PG - external pull-up is mandatory.

What thermal considerations apply to the TC1304-ZI0EMF in DFN package?

The TC1304-ZI0EMF in 3×3 mm DFN has a typical θ_JA of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the exposed pad (EP). To maintain <125°C junction temperature at full 500 mA buck + 300 mA LDO load, ambient must stay below ~85°C. Proper EP soldering and copper pour area are essential - insufficient thermal relief causes premature thermal shutdown.

Can the TC1304-ZI0EMF operate from a single 3.7 V Li-ion battery?

Yes, the TC1304-ZI0EMF operates from 2.7 V to 5.5 V input, making it compatible with single-cell Li-ion (2.7–4.2 V) and USB 5 V sources. At 3.7 V input, it delivers 3.3 V buck output with 280 mV dropout and 1.8 V LDO output with 137 mV dropout - ensuring regulation across the full battery discharge curve without brownout.