Microchip Technology TC1303C-ZI0EUNTR

Overview

TC1303C-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 power-good monitoring of both outputs. It delivers 1.8 V @ 500 mA (buck) and 3.3 V @ 300 mA (LDO) from a 2.7–5.5 V input, features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature - used in portable medical instruments and USB-powered devices.

For engineers reviewing the TC1303C-ZI0EUNTR datasheet, TC1303C-ZI0EUNTR pinout, TC1303C-ZI0EUNTR application, or TC1303C-ZI0EUNTR equivalent, key selection criteria include independent shutdown control for each output, 300 ms programmable power-good delay for processor reset coordination, dual-output voltage sequencing capability (via external timing), and compatibility with 1 µF ceramic output capacitors on the LDO rail.

Technical Context

The TC1303C-ZI0EUNTR implements a synchronous buck stage with integrated P- and N-channel MOSFETs (R_DS(on) = 450 mΩ each), operating at 2.0 MHz nominal switching frequency and automatically transitioning between PWM and PFM modes under light load to maintain ultra-low quiescent current. Its LDO stage uses internal compensation and achieves 137 mV dropout at 200 mA, supporting fixed 3.3 V output without external feedback components.

Power-good logic monitors both VOUT1 (buck) and VOUT2 (LDO) simultaneously with 94% threshold high and 89% threshold low hysteresis, generating an open-drain PG signal with 165 µs propagation delay and 262 ms active timeout period. UVLO activates below 2.55 V (typical), and thermal shutdown engages at 165°C with 10°C hysteresis.

Key Specifications

Pinout & Package

TC1303C-ZI0EUNTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), optimized for high thermal conductivity and space-constrained PCB layouts. Pin 1 is SHDN2; pin 10 is PG; the EP must be connected to AGND per Microchip layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP16311-H/MS and TPS650350RGER, TC1303C-ZI0EUNTR uniquely provides verified dual-output PG monitoring in a 10-pin DFN with industry-leading 65 µA IQ - making it optimal for space- and battery-life constrained dual-rail systems where coordinated rail validation is mandatory.

Availability

TC1303C-ZI0EUNTR is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered test equipment, and industrial edge sensor nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TC1303C-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 microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software offerings.

The TC1303 family was designed specifically for battery-powered portable electronics needing compact, low-IQ dual-rail power conversion - emphasizing integration, thermal efficiency, and robustness across extended temperature ranges.

FAQ

What output voltages does the TC1303C-ZI0EUNTR provide?

The TC1303C-ZI0EUNTR delivers a fixed 1.8 V output from its synchronous buck regulator (VOUT1) and a fixed 3.3 V output from its low-dropout linear regulator (VOUT2). These values are factory-set per the "ZI0E" suffix designation and require no external feedback resistors - simplifying layout and reducing BOM count.

How does the power-good (PG) function operate on the TC1303C-ZI0EUNTR?

The TC1303C-ZI0EUNTR's PG pin is an open-drain output that asserts low only when both VOUT1 and VOUT2 are within 94% to 96% of their nominal values. It incorporates a 300 ms active timeout period and 165 µs propagation delay, meeting JEDEC reset timing requirements for microprocessors and SoCs.

Can the TC1303C-ZI0EUNTR support independent enable/disable of its two outputs?

Yes - the TC1303C-ZI0EUNTR provides dedicated SHDN1 and SHDN2 pins to independently control the buck and LDO regulators. Driving SHDN1 low disables VOUT1 while leaving VOUT2 active, and vice versa for SHDN2 - enabling precise power-state management in multi-mode systems.

What is the minimum input voltage required for the TC1303C-ZI0EUNTR to regulate both outputs?

The TC1303C-ZI0EUNTR requires a minimum input voltage of 2.7 V, but actual functional minimum depends on output settings: for 1.8 V buck and 3.3 V LDO, VIN must exceed VOUT2 + dropout (≥ 3.3 V + 0.137 V = 3.437 V) to sustain LDO regulation - so 3.45 V is the practical lower limit under full load.

Which package type is used by the TC1303C-ZI0EUNTR, and what thermal considerations apply?

The TC1303C-ZI0EUNTR uses a 10-pin 3×3 mm DFN package with exposed thermal pad (EP). Its θ_JA is 41°C/W on a 4-layer board with internal ground plane and thermal vias - requiring the EP to be soldered to AGND for effective heat dissipation, especially above 300 mA combined load.