Microchip Technology TC1303C-ZS0EMF

Overview

TC1303C-ZS0EMF 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 90% typical efficiency at 2.0 MHz switching frequency, features 65 µA total quiescent current, 137 mV LDO dropout at 200 mA, and operates across –40°C to +125°C for portable medical instruments and USB-powered devices.

For engineers reviewing the TC1303C-ZS0EMF datasheet, TC1303C-ZS0EMF pinout, TC1303C-ZS0EMF application, or TC1303C-ZS0EMF equivalent, key selection criteria include independent shutdown control per output, internal compensation, 300 ms PG delay for processor reset, and compatibility with 3×3 mm DFN-10 packaging for space-constrained designs.

Technical Context

The TC1303C-ZS0EMF implements a fixed-frequency PWM buck stage (2.0 MHz) that automatically transitions to PFM mode under light load to minimize quiescent current, while its LDO output requires only a single 1 µF ceramic capacitor. Both regulators are internally compensated and support adjustable (0.8–4.5 V) or standard fixed voltages.

Its power-good function monitors regulation status of both VOUT1 and VOUT2 simultaneously with 94% threshold high and 89% threshold low, delivering an open-drain PG signal with 165 µs delay and 262 ms active timeout-designed specifically for reliable microprocessor reset sequencing in battery-powered systems.

Key Specifications

Pinout & Package

TC1303C-ZS0EMF is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed 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 thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS65023BRSBR and RT8059ZSP, the TC1303C-ZS0EMF uniquely combines buck+LDO integration, dual-rail PG monitoring, and ultra-low IQ in a compact DFN-10-making it optimal for cost-sensitive, space-constrained dual-rail applications where analog rail cleanliness and reset reliability are critical.

Availability

TC1303C-ZS0EMF is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered peripherals, and handheld industrial scanners requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for TC1303C-ZS0EMF 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, and Flash-IP solutions, serving industrial, automotive, communications, and consumer markets with high-reliability silicon and development tools.

The TC1303 family was designed to reduce power subsystem complexity in portable electronics by integrating buck, LDO, and intelligent power monitoring into a single compact package-targeting battery life extension and board area reduction.

FAQ

What output voltage options are supported by the TC1303C-ZS0EMF?

The TC1303C-ZS0EMF supports both adjustable and fixed-output configurations. For the buck regulator (VOUT1), it offers adjustable range from 0.8 V to 4.5 V via external resistor divider, or factory-trimmed fixed outputs including 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V. The LDO (VOUT2) provides fixed outputs of 1.5 V, 1.8 V, 2.5 V, or 3.3 V. The ZS0EMF variant is a specific fixed-output configuration-its exact VOUT1/VOUT2 pair is defined by the suffix coding per Microchip's ordering guide.

How does the power-good (PG) function operate on the TC1303C-ZS0EMF?

The TC1303C-ZS0EMF's PG pin is an open-drain output that asserts low only after both VOUT1 and VOUT2 reach and sustain ≥94% of their nominal values for ≥300 ms. It releases (goes high-impedance) when either output falls below 89% of nominal. This dual-monitoring behavior-distinct from TC1303A (buck-only) and TC1303B (LDO-only)-ensures safe processor reset timing in systems dependent on two stable rails.

Can the TC1303C-ZS0EMF be used with different input voltage sources for VIN1 and VIN2?

No-the TC1303C-ZS0EMF datasheet specifies that VIN1 and VIN2 must be supplied from the same input source. Section 3.3 explicitly states "Connect VIN1 and VIN2 together with board traces as short as possible." Using separate sources risks violating absolute maximum ratings, destabilizing regulation, and invalidating PG monitoring due to differential input behavior.

What thermal performance can be expected from the TC1303C-ZS0EMF in a DFN-10 package?

In a standard 4-layer PCB with internal ground plane and two thermal vias under the exposed pad, the TC1303C-ZS0EMF achieves θ_JA = 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 is ~0.8 W, resulting in ~33°C junction-to-ambient rise-well within the –40°C to +125°C operating range. Thermal shutdown activates at 165°C with 10°C hysteresis.

Does the TC1303C-ZS0EMF require external compensation components?

No-the TC1303C-ZS0EMF features fully internal compensation for both the buck regulator and LDO. This eliminates external RC networks, reduces design risk, and minimizes PCB area. The internal compensation is optimized for stability with the recommended 4.7 µH inductor and 4.7 µF input / 4.7 µF buck output / 1 µF LDO output capacitors specified in the datasheet.