Microchip Technology TC1304-ZP0EMF

Overview

TC1304-ZP0EMF 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 total quiescent current of 70.1 µA typical. It operates across -40°C to +125°C and supports input voltages from 2.7 V to 5.5 V, serving as a compact voltage source for battery-powered portable electronics requiring precise core and bias rail sequencing.

For engineers reviewing the TC1304-ZP0EMF datasheet, TC1304-ZP0EMF pinout, TC1304-ZP0EMF application, or TC1304-ZP0EMF equivalent, key selection considerations include its dual-regulator architecture with independent output monitoring, fixed 2.0 MHz switching frequency, 137 mV LDO dropout at 200 mA, open-drain PG output, and support for both adjustable (0.8–4.5 V) and fixed-output configurations in a 10-pin DFN package.

Technical Context

The TC1304-ZP0EMF implements sequenced power-up and power-down control: the LDO output (VOUT2) ramps first, followed by the buck output (VOUT1), ensuring safe biasing of downstream logic before core voltage application. Its buck stage uses synchronous rectification with P- and N-channel MOSFETs (R_DS(on) = 450 mΩ each), fixed 2.0 MHz PWM operation under heavy load, and automatic transition to PFM mode at light loads to maintain ultra-low IQ.

The LDO output features internal compensation, requires only a 1 µF ceramic capacitor, and delivers ±0.3% output voltage tolerance over temperature and line/load variations. The open-drain PG signal monitors both outputs simultaneously and asserts after a 300 ms delay once both VOUT1 and VOUT2 reach ≥94% of regulation - a timing-critical function for processor reset coordination.

Key Specifications

Pinout & Package

TC1304-ZP0EMF is housed in a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP), optimized for high-power-density PCB layouts and thermal performance (θ_JA = 41°C/W on 4-layer board). Pin functions are electrically and physically identical to the MSOP variant but with tighter footprint and improved thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TC1303C-ZP0EMF and TPS65023RGTR, TC1304-ZP0EMF uniquely integrates hardware-based sequencing in a compact DFN package with lowest quiescent current, eliminating software dependency and external timing components while maintaining full pin compatibility with the TC1303 family.

Availability

TC1304-ZP0EMF is available at Aetrix Electronics and suitable for portable medical devices, USB-powered test equipment, industrial edge sensors, and wearable health monitors requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TC1304-ZP0EMF 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 manufacturing and support infrastructure.

The TC1303/TC1304 product line was designed specifically for space-constrained, battery-operated portable electronics requiring highly integrated, low-quiescent-current dual-rail power solutions with robust protection and sequencing capability.

FAQ

What is the function of the SHDN pin on the TC1304-ZP0EMF?

The SHDN pin on the TC1304-ZP0EMF is an active-high logic input that initiates hardware-controlled sequencing: it enables the LDO output (VOUT2) first, then the buck output (VOUT1) after a defined delay. When pulled low (<15% VIN), it disables both regulators in reverse order - LDO shuts down before buck - preventing backfeed and ensuring safe power cycling. This behavior is intrinsic to the TC1304-ZP0EMF and differs from TC1303 variants with separate SHDN1/SHDN2 pins.

Does the TC1304-ZP0EMF support adjustable output voltage on both regulators?

The TC1304-ZP0EMF supports adjustable output voltage only on the buck regulator (VOUT1), via external resistor divider connected to the VFB1/VOUT1 pin (0.8 V to 4.5 V range). The LDO output (VOUT2) is factory-trimmed to a fixed voltage - for TC1304-ZP0EMF, this is 3.3 V, as indicated by the "ZP" suffix per Microchip's part numbering scheme. No external adjustment is possible for VOUT2.

How does the power-good (PG) output behave on the TC1304-ZP0EMF?

The PG output on the TC1304-ZP0EMF is an open-drain signal that remains low until both VOUT1 and VOUT2 reach ≥94% of their target voltages, then asserts high after a fixed 300 ms delay. It monitors both regulators simultaneously - unlike TC1303A (buck-only) or TC1303B (LDO-only) - and is designed to drive standard processor reset inputs. The TC1304-ZP0EMF's PG pin requires an external pull-up resistor to the desired logic voltage.

What thermal performance can be expected from the TC1304-ZP0EMF in a 10-pin DFN package?

In a standard 4-layer PCB with internal ground plane and two thermal vias under the exposed pad, the TC1304-ZP0EMF achieves a junction-to-ambient thermal resistance (θ_JA) of 41°C/W. At full 500 mA buck + 300 mA LDO load with 5 V input and 3.3 V/1.8 V outputs, power dissipation remains below 0.5 W, keeping junction temperature rise under 21°C above ambient - well within the -40°C to +125°C operating range. Thermal shutdown activates at 165°C with 10°C hysteresis.

Can the TC1304-ZP0EMF operate with different input sources for VIN1 and VIN2?

No - the TC1304-ZP0EMF datasheet explicitly states that VIN1 and VIN2 must be supplied from the same input source (Note 8, DS21949C-page 7). Routing separate supplies risks violating internal biasing conditions, compromising regulation accuracy, and potentially damaging the device due to voltage differentials between AGND and PGND. For designs requiring independent inputs, discrete regulators or alternate PMICs with isolated inputs must be used instead of TC1304-ZP0EMF.