Microchip Technology TC1303B-AG0EMFTR

Overview

TC1303B-AG0EMFTR 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 94% typical regulation accuracy, 137 mV dropout at 200 mA for VOUT2, and operates across –40°C to +125°C junction temperature. Used in portable medical instruments and USB-powered devices requiring tightly regulated dual-rail supplies.

For engineers reviewing the TC1303B-AG0EMFTR datasheet, TC1303B-AG0EMFTR pinout, TC1303B-AG0EMFTR application, or TC1303B-AG0EMFTR equivalent, key selection considerations include its LDO-monitored PG function, independent shutdown control per rail, 2.0 MHz fixed-frequency PWM operation under heavy load, and compatibility with 1 µF ceramic output capacitors on both outputs.

Technical Context

The TC1303B-AG0EMFTR implements a synchronous buck converter with integrated P- 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 PFM mode at light loads to maintain 65 µA total quiescent current. Its LDO stage features internal compensation and supports standard fixed outputs (1.5V/1.8V/2.5V/3.3V).

Power-good logic is configured as a push-pull output (unlike open-drain variants A/C/TC1304) and asserts when VOUT2 reaches ≥94% of nominal voltage, with 300 ms delay used for processor reset timing. UVLO triggers at 2.55 V (typical) with 200 mV hysteresis, and thermal shutdown activates at 165°C with 10°C hysteresis.

Key Specifications

Pinout & Package

TC1303B-AG0EMFTR is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), pin-compatible with MSOP-10. The EP must be soldered to AGND for thermal and electrical integrity.

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 TPS65023RGTR, TC1303B-AG0EMFTR uniquely provides LDO-targeted power-good assertion and fully independent shutdown control-critical for systems where auxiliary supply integrity must be verified before enabling peripherals.

Availability

TC1303B-AG0EMFTR is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for TC1303B-AG0EMFTR 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 company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer applications.

The TC1303 family was designed specifically for space-constrained portable electronics needing highly integrated, low-quiescent dual-rail power solutions with flexible sequencing and robust protection features.

FAQ

What output voltages does TC1303B-AG0EMFTR support for its LDO stage?

TC1303B-AG0EMFTR supports fixed LDO output voltages of 1.5 V, 1.8 V, 2.5 V, and 3.3 V - selected at manufacture and indicated by the suffix code. The "AG0" in TC1303B-AG0EMFTR specifies a 1.8 V LDO output. No external resistors are required; the voltage is factory-trimmed and stable over temperature and load.

How does the power-good (PG) output of TC1303B-AG0EMFTR differ from TC1303A or TC1303C?

TC1303B-AG0EMFTR features a push-pull PG output that actively drives high when VOUT2 reaches ≥94% of regulation, eliminating the need for an external pull-up resistor. In contrast, TC1303A and TC1303C use open-drain PG outputs requiring external pull-up. This difference is inherent to the TC1303B variant and applies to all TC1303B-xxx part numbers.

Can TC1303B-AG0EMFTR operate with only the LDO enabled while the buck regulator is disabled?

Yes. TC1303B-AG0EMFTR supports independent control: SHDN1 disables only the buck regulator, while SHDN2 disables only the LDO. With SHDN1 grounded and SHDN2 tied to VIN2, the LDO remains fully operational delivering 1.8 V at up to 300 mA - ideal for low-power standby modes where only auxiliary circuitry remains active.

What is the minimum input voltage required for TC1303B-AG0EMFTR to regulate 1.8 V on both outputs?

For TC1303B-AG0EMFTR to regulate 1.8 V on VOUT2 (LDO), input must satisfy VIN ≥ VOUT2 + dropout = 1.8 V + 0.137 V = 1.937 V (typical). However, the absolute minimum specified VIN is 2.7 V per datasheet - this ensures proper UVLO release, gate drive margin, and stable operation across process/voltage/temperature corners.

Does TC1303B-AG0EMFTR require external compensation components for either regulator?

No. Both the synchronous buck regulator and the LDO in TC1303B-AG0EMFTR are internally compensated. The buck stage uses integrated loop compensation optimized for 4.7 µH inductors and 4.7 µF output capacitors; the LDO requires only a 1 µF ceramic output capacitor on VOUT2. No external RC networks or compensation pins are needed.