Microchip Technology TC1303B-SH0EMFTR

Overview

TC1303B-SH0EMFTR 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 the power-good (PG) output monitoring only the LDO output (VOUT2). It delivers 1.8 V at 500 mA and 3.3 V at 300 mA, operates from 2.7–5.5 V input, and features 65 µA typical quiescent current and 2.0 MHz fixed-frequency PWM switching. It is used in portable medical instruments requiring stable dual-rail biasing with processor reset signaling.

For engineers reviewing the TC1303B-SH0EMFTR datasheet, TC1303B-SH0EMFTR pinout, TC1303B-SH0EMFTR application, or TC1303B-SH0EMFTR equivalent, key selection criteria include LDO-monitored PG behavior, independent SHDN1/SHDN2 control, 137 mV dropout at 200 mA, DFN-10 package thermal resistance (41°C/W), and compatibility with ceramic output capacitors as small as 1 µF for VOUT2.

Technical Context

The TC1303B-SH0EMFTR implements a synchronous buck converter with automatic PWM-to-PFM mode transition under light load to maintain ultra-low quiescent current, while its integrated LDO uses internal compensation and requires only a single 1 µF ceramic output capacitor. The PG pin is push-pull and asserts when VOUT2 reaches ≥94% of nominal voltage, with 300 ms delay for processor reset timing.

It supports independent shutdown of buck (SHDN1) and LDO (SHDN2) outputs, enabling flexible power sequencing. UVLO activates below 2.4 V, thermal shutdown triggers at 165°C with 10°C hysteresis, and both outputs include short-circuit and overtemperature protection.

Key Specifications

Pinout & Package

TC1303B-SH0EMFTR is housed in a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP) connected to AGND. The package provides 41°C/W junction-to-ambient thermal resistance on a 4-layer PCB 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 TPS65023BRSBT and RT8059ZSP, TC1303B-SH0EMFTR uniquely integrates LDO-monitored push-pull PG in a compact DFN, delivering lower system-level BOM count and longer battery life for handheld medical and diagnostic tools where LDO-supplied rails must be validated before system boot.

Availability

TC1303B-SH0EMFTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for TC1303B-SH0EMFTR 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, serving automotive, industrial, and consumer markets with high-reliability silicon and development tools.

The TC1303 family was designed specifically for space-constrained, battery-operated devices needing efficient dual-rail power with intelligent power-good supervision - emphasizing low IQ, small footprint, and simplified design-in.

FAQ

What output voltages does the TC1303B-SH0EMFTR provide?

The TC1303B-SH0EMFTR provides 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 defined by the "SH0E" suffix in the part number and require no external feedback resistors. Both outputs are internally compensated and stable with minimum 1 µF ceramic capacitors.

How does the power-good (PG) output behave on the TC1303B-SH0EMFTR?

The PG output of the TC1303B-SH0EMFTR is a push-pull driver that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches ≥94% of 3.3 V and remains asserted for ≥300 ms after valid regulation is achieved. It deasserts when VOUT2 falls below 92% of nominal. This behavior is specific to the TC1303B variant and differs from TC1303A (buck-monitored) and TC1303C (dual-monitored).

Can the buck and LDO outputs be controlled independently on the TC1303B-SH0EMFTR?

Yes - the TC1303B-SH0EMFTR features independent shutdown inputs: SHDN1 controls the 500 mA buck regulator, and SHDN2 controls the 300 mA LDO. Each responds to active-high logic (>45% VIN). This allows precise sequencing - for example, enabling the LDO first to power peripheral bias before bringing up the processor core via the buck regulator.

What is the minimum input voltage required for reliable 3.3 V LDO operation on the TC1303B-SH0EMFTR?

For reliable 3.3 V LDO operation, the input voltage (VIN2) must exceed 3.437 V - calculated as VOUT2 + dropout voltage = 3.3 V + 137 mV (typical @ 200 mA). The datasheet specifies a minimum input of 2.7 V, but actual minimum depends on load: at 300 mA, dropout rises to 205–300 mV, requiring VIN2 ≥ 3.505–3.6 V. Always verify against worst-case dropout in your thermal and load conditions.

Which package type is used by the TC1303B-SH0EMFTR, and what are its thermal characteristics?

The TC1303B-SH0EMFTR uses a 3×3 mm, 10-pin DFN package with exposed thermal pad (EP). Its junction-to-ambient thermal resistance (θJA) is 41°C/W on a standard 4-layer PCB with internal ground plane and two thermal vias under the EP. This enables continuous 500 mA buck operation at ambient temperatures up to +85°C without forced airflow, provided PCB copper area and via count meet Microchip's layout guidelines.