Microchip Technology TC1304-ZA0EUNTR

Overview

TC1304-ZA0EUNTR 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 from 2.7V to 5.5V input. It delivers 1.8V/500 mA (buck) and 2.5V/300 mA (LDO) in a 10-pin 3×3 mm DFN package, targeting portable medical instruments and USB-powered devices requiring tight voltage sequencing.

For engineers reviewing the TC1304-ZA0EUNTR datasheet, TC1304-ZA0EUNTR pinout, TC1304-ZA0EUNTR application, or TC1304-ZA0EUNTR equivalent, key selection criteria include its dual-output sequencing capability, 65 µA typical quiescent current, 2.0 MHz fixed-frequency PWM operation, 137 mV LDO dropout at 200 mA, and open-drain PG output monitoring both regulators - critical for processor reset coordination in battery-constrained systems.

Technical Context

The TC1304-ZA0EUNTR implements independent control logic for buck and LDO outputs with hardware-enforced sequencing: LDO enables first, followed by buck regulator on startup; reverse order on shutdown. Its synchronous buck stage uses integrated P- and N-channel MOSFETs (R_DS(on) = 450 mΩ each) and transitions automatically between PWM and PFM modes to maintain efficiency across load ranges.

The LDO employs internal compensation and requires only a single 1 µF ceramic output capacitor. Power-good generation monitors both VOUT1 and VOUT2 simultaneously with 94% threshold hysteresis and 300 ms active timeout, meeting processor reset timing requirements without external circuitry.

Key Specifications

Pinout & Package

TC1304-ZA0EUNTR is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. The package supports high-power-density layouts and achieves θ_JA = 41°C/W on a 4-layer board 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 TPS65023RSBR and RT8059ZSP, TC1304-ZA0EUNTR uniquely combines buck+LDO in a compact DFN with hardware sequencing and ultra-low 65 µA IQ - making it optimal for space- and battery-limited portable medical and USB devices needing clean analog power.

Availability

TC1304-ZA0EUNTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TC1304-ZA0EUNTR 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, 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-powered applications requiring dual-rail power with sequencing, low quiescent current, and minimal external components - targeting medical, instrumentation, and handheld computing segments.

FAQ

What output voltages does the TC1304-ZA0EUNTR provide?

The TC1304-ZA0EUNTR provides fixed 1.8V from its synchronous buck regulator (VOUT1) and fixed 2.5V from its low-dropout linear regulator (VOUT2). These values are factory-programmed and do not require external feedback resistors. Both outputs are specified over the full -40°C to +125°C junction temperature range with ±0.3% tolerance, enabling reliable operation in portable medical and industrial environments where thermal stability is critical. The TC1304-ZA0EUNTR datasheet confirms these outputs in Table 1-1 and Figure 2-11 through 2-13.

How does the power-good (PG) function operate on the TC1304-ZA0EUNTR?

The TC1304-ZA0EUNTR features an open-drain PG output that monitors both VOUT1 and VOUT2 simultaneously, asserting low only when both outputs are within 94% to 96% of their nominal values. It includes a 300 ms active timeout period after valid regulation is achieved, satisfying processor reset timing requirements. The PG pin remains low during startup until both rails stabilize, then transitions high after the delay - a behavior confirmed in DS21949C-page 9's PG Active Time-out Period (tRPU) specification and Figure 2-41 timing diagram. This dual-rail monitoring is exclusive to TC1303C and TC1304 variants.

Does the TC1304-ZA0EUNTR support independent enable control for each regulator?

No, the TC1304-ZA0EUNTR uses a single SHDN pin to control both regulators with built-in sequencing logic: the LDO (VOUT2) enables first and disables last, while the buck regulator (VOUT1) enables second and disables first. This differs from the TC1303 series, which provides separate SHDN1 and SHDN2 pins. The TC1304-ZA0EUNTR's sequencing is hardware-implemented and cannot be disabled or reconfigured - a key differentiator confirmed in the Functional Block Diagram (DS21949C-page 4) and Pin Descriptions section (DS21949C-page 19).

What is the thermal performance of the TC1304-ZA0EUNTR in its DFN package?

The TC1304-ZA0EUNTR in its 10-pin 3×3 mm DFN package achieves a typical junction-to-ambient thermal resistance (θ_JA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the exposed pad (EP). This allows continuous 500 mA buck output at ambient temperatures up to +85°C with proper copper pour. The device includes thermal shutdown at 165°C with 10°C hysteresis, and the EP must be soldered to AGND for both thermal and EMI performance - specifications verified in DS21949C-page 10's Thermal Package Resistances table and Section 5.0 Layout Guidelines.

Can the TC1304-ZA0EUNTR operate from a single 3.7V Li-ion cell?

Yes, the TC1304-ZA0EUNTR operates from 2.7V to 5.5V input, fully supporting single-cell Li-ion batteries (2.7–4.2V). At 3.7V input, it delivers 1.8V/500 mA buck output with >90% efficiency (per Figure 2-8) and 2.5V/300 mA LDO output with 137 mV dropout - leaving 1.03V headroom, well above the 205 mV worst-case dropout at 300 mA. Undervoltage lockout activates below 2.4V (typical), protecting downstream circuitry during deep discharge. These parameters are validated in DS21949C-page 7's Absolute Maximum Ratings and page 8's Dropout Voltage specifications.