Microchip Technology TC1303B-PI0EMF

Overview

TC1303B-PI0EMF 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 focused on the LDO output. It delivers 1.8 V @ 500 mA and 3.3 V @ 300 mA from a 2.7–5.5 V input, features 65 µA typical quiescent current, 2.0 MHz fixed-frequency PWM operation, and operates across –40°C to +125°C junction temperature for portable medical instruments and USB-powered devices.

For engineers reviewing the TC1303B-PI0EMF datasheet, TC1303B-PI0EMF pinout, TC1303B-PI0EMF application, or TC1303B-PI0EMF equivalent, key selection criteria include LDO-monitored PG output, independent SHDN1/SHDN2 control, 137 mV dropout at 200 mA, internal compensation, and DFN/MSOP package compatibility in space-constrained battery-powered systems.

Technical Context

The TC1303B-PI0EMF implements a fixed-frequency 2.0 MHz synchronous buck stage with automatic transition to PFM mode under light load to maintain ultra-low IQ, while its LDO stage uses a single 1 µF ceramic output capacitor and achieves 137 mV dropout at 200 mA. The device employs separate shutdown inputs (SHDN1 for buck, SHDN2 for LDO) and integrates UVLO, overtemperature, and short-circuit protection on both outputs.

Its power-good (PG) output is a push-pull signal referenced exclusively to VOUT2 regulation (94% threshold, 300 ms delay), distinguishing it from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored). The feedback pin VFB1/VOUT1 supports adjustable output (0.8–4.5 V) or direct connection for fixed-voltage variants.

Key Specifications

Pinout & Package

TC1303B-PI0EMF is packaged in a 10-pin 3×3 mm DFN (exposed pad) or MSOP package. The exposed thermal pad must be connected to AGND for thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1826-3302E/DB and TPS65023RSBR, TC1303B-PI0EMF uniquely integrates buck+LDO+LDO-monitored PG in a 3×3 mm DFN with independent shutdown-offering optimal balance of integration, size, and sequencing control for cost-sensitive portable designs.

Availability

TC1303B-PI0EMF 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 assurance, and RoHS-compliant packaging.

Supply support for TC1303B-PI0EMF 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for embedded control applications.

The TC1303 family was designed specifically for space-constrained, battery-powered consumer and medical devices requiring dual regulated supplies with minimal external components and robust power sequencing.

FAQ

What output voltages does the TC1303B-PI0EMF provide?

The TC1303B-PI0EMF provides two fixed output voltages: 1.8 V from its synchronous buck regulator (VOUT1) and 3.3 V from its low-dropout linear regulator (VOUT2). These values are factory-trimmed and confirmed by the "PI0" suffix per Microchip's ordering guide; no external resistor divider is required for these configurations. The TC1303B-PI0EMF does not support adjustable outputs without circuit modification.

How does the power-good (PG) output of the TC1303B-PI0EMF differ from other TC1303 variants?

The TC1303B-PI0EMF features a push-pull PG output that monitors only the LDO output (VOUT2), asserting high when VOUT2 reaches 94% of its nominal value with a 300 ms delay. This differs from TC1303A (PG monitors buck only) and TC1303C/TC1304 (PG monitors both rails). The TC1303B-PI0EMF's PG behavior ensures system reset is synchronized to auxiliary rail stability, not core rail.

Can the buck and LDO outputs of the TC1303B-PI0EMF be enabled independently?

Yes-the TC1303B-PI0EMF provides independent shutdown control via SHDN1 (buck) and SHDN2 (LDO). Driving SHDN1 low disables only the 500 mA buck regulator while leaving the 300 mA LDO active, and vice versa. This enables flexible power sequencing-for example, keeping VOUT2 (3.3 V) active to sustain real-time clock or sensor bias while powering down the MCU core rail (VOUT1).

What is the minimum input voltage required for the TC1303B-PI0EMF to regulate both outputs?

The TC1303B-PI0EMF requires VIN ≥ 2.7 V minimum, but practical regulation depends on dropout margins: for VOUT1 = 1.8 V, VIN must exceed 1.8 V + 280 mV = 2.08 V; for VOUT2 = 3.3 V, VIN must exceed 3.3 V + 137 mV = 3.437 V. Thus, to regulate both simultaneously, VIN must be ≥ 3.437 V. Below this, only the buck may remain in regulation while the LDO drops out.

Which package type does the TC1303B-PI0EMF use, and what layout considerations apply?

The TC1303B-PI0EMF uses a 10-pin 3×3 mm DFN package with an exposed thermal pad (suffix "EMF"). The pad must be soldered to a dedicated AGND copper pour with ≥4 thermal vias to inner ground planes. VIN1/VIN2 decoupling capacitors (4.7 µF each) must be placed within 2 mm of their respective pins, and the LX trace must be short, wide, and isolated from sensitive analog traces to minimize EMI coupling in the TC1303B-PI0EMF layout.