Microchip Technology TC1303B-SI0EMFTR

Overview

TC1303B-SI0EMFTR 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 specifically of the LDO output. It delivers 1.8 V @ 500 mA and 2.5 V @ 300 mA in typical fixed-output configurations, operates from 2.7–5.5 V input, and features 65 µA total quiescent current. It is used in portable medical instruments and USB-powered devices requiring tightly regulated dual supplies.

For engineers reviewing the TC1303B-SI0EMFTR datasheet, TC1303B-SI0EMFTR pinout, TC1303B-SI0EMFTR application, or TC1303B-SI0EMFTR equivalent, key selection criteria include LDO-specific PG monitoring, independent shutdown control for each regulator, 2.0 MHz fixed-frequency PWM operation with automatic PFM transition, 137 mV dropout at 200 mA, and compatibility with 1 µF ceramic output capacitors on both outputs.

Technical Context

The TC1303B-SI0EMFTR implements a synchronous buck stage with integrated P-channel and N-channel MOSFETs (R_DS(on) = 450 mΩ each), operating at a fixed 2.0 MHz switching frequency under heavy load and transitioning automatically to pulse-frequency modulation (PFM) at light loads to maintain ultra-low quiescent current. Its LDO stage uses internal compensation and achieves ±0.3% output voltage tolerance over temperature and line/load variations.

Power-good functionality is implemented as a push-pull output (unique to TC1303B variants) that asserts when VOUT2 reaches 94% of its nominal value, with 300 ms delay and 2% hysteresis - designed explicitly for processor reset timing coordination. UVLO (2.55 V typ), thermal shutdown (165°C), and short-circuit protection are integrated across both regulators.

Key Specifications

Pinout & Package

TC1303B-SI0EMFTR is packaged in a 10-lead 3×3 mm DFN with exposed pad (EP), thermally optimized for high-power-density applications. The package is RoHS-compliant and rated for -40°C to +125°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1826S-1802E/DB and TPS65023RSBR, TC1303B-SI0EMFTR uniquely combines independent dual-rail control, LDO-specific push-pull PG, and ultra-low IQ in a 3×3 mm DFN - making it optimal for cost-sensitive, space-constrained portable designs requiring guaranteed reset timing without software intervention.

Availability

TC1303B-SI0EMFTR 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 guaranteed RoHS-compliant sourcing.

Supply support for TC1303B-SI0EMFTR 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, with a focus on embedded control and energy-efficient solutions.

The TC1303 family was designed specifically for battery-powered portable electronics needing compact, low-quiescent dual-rail power - emphasizing simplicity, reliability, and minimal external component count.

FAQ

What output voltages does the TC1303B-SI0EMFTR provide?

The TC1303B-SI0EMFTR is a fixed-output variant delivering 1.8 V from its synchronous buck regulator (VOUT1) and 2.5 V from its low-dropout linear regulator (VOUT2). These values are laser-trimmed at wafer test and specified with ±0.3% tolerance over temperature and load. The part number suffix "SI0EMFTR" confirms this specific dual-voltage configuration, eliminating need for external feedback resistors.

How does the power-good (PG) function work on the TC1303B-SI0EMFTR?

The TC1303B-SI0EMFTR features a push-pull PG output that monitors only the LDO output (VOUT2). It asserts high when VOUT2 reaches 94% of its nominal value, with 300 ms delay and 2% hysteresis. Unlike open-drain variants (TC1303A/C), this push-pull configuration drives the host processor's RESET pin directly without an external pull-up resistor - simplifying schematic and improving noise immunity in noisy environments.

Can the buck and LDO outputs be enabled independently on the TC1303B-SI0EMFTR?

Yes. The TC1303B-SI0EMFTR provides two dedicated shutdown inputs: SHDN1 controls the buck regulator and SHDN2 controls the LDO. Both are active-high logic inputs requiring >45% of VIN to enable. This allows precise sequencing - for example, powering the LDO first to bias analog circuitry before enabling the buck for digital core - without requiring external logic or timing circuits.

What is the minimum input voltage required for the TC1303B-SI0EMFTR to regulate both outputs?

The TC1303B-SI0EMFTR requires VIN ≥ 2.7 V minimum, but actual minimum depends on output requirements: for VOUT2 = 2.5 V, dropout is 137 mV @ 200 mA, so VIN must be ≥ 2.637 V; for VOUT1 = 1.8 V, dropout is 280 mV @ 500 mA, so VIN must be ≥ 2.08 V. Thus, the system-level minimum is 2.7 V - ensuring regulation across all conditions including worst-case temperature and load.

Does the TC1303B-SI0EMFTR require external compensation components?

No. Both the synchronous buck regulator and the LDO in the TC1303B-SI0EMFTR are internally compensated. This eliminates the need for external compensation capacitors or resistors on either feedback loop - reducing bill-of-materials cost, PCB area, and design validation effort. Stability is guaranteed with the recommended 4.7 µH inductor and 4.7 µF input / 1 µF output ceramic capacitors.