onsemi CAT6219-280MV2T3

Overview

CAT6219-280MV2T3 from onsemi is a fixed-output 2.80 V, 500 mA CMOS low-dropout (LDO) regulator in a 1.5 mm × 1.5 mm WDFN-6 package. It delivers ±1.0% initial output voltage accuracy, 300 mV typical dropout at full load, and operates from 2.3 V to 5.5 V input. Designed for battery-powered portable electronics, it features quick-start capability with optional 10 nF bypass capacitor for noise reduction and zero shutdown current.

For engineers reviewing the CAT6219-280MV2T3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 2.80 V fixed output, 55 µA no-load ground current, thermal/overcurrent protection, stable operation with 2.2 µF ceramic output capacitor, and compatibility with compact PCB layouts requiring minimal external components.

Technical Context

The CAT6219-280MV2T3 integrates a CMOS pass transistor with internal reference, error amplifier, and enable logic. Its under-voltage lockout activates below 2.15 V typical, preventing erratic operation during brownout. The BYP pin supports external 10 nF capacitor to enhance PSRR above 1 kHz-64 dB at 1 kHz and 54 dB at 20 kHz-without compromising 150 µs turn-on time.

Thermal protection triggers at 160 °C with 10 °C hysteresis, and fold-back current limiting restricts short-circuit output current to 200 mA. The device maintains ±2.0% output accuracy over −40 °C to +125 °C junction temperature and exhibits 40 ppm/°C output voltage temperature coefficient.

Key Specifications

Pinout & Package

Package: WDFN-6 (1.5 mm × 1.5 mm, 0.75 mm height), RoHS-compliant, exposed thermal pad (DAP size 1.8 mm × 1.2 mm) requiring PCB ground connection for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700-2802E/TO and TPL7407LDR, the CAT6219-280MV2T3 uniquely combines 500 mA capability, 300 mV dropout, integrated UVLO, and BYP-enabled PSRR enhancement-making it the only option qualified for precision 2.8 V analog power in portable medical and wireless edge devices.

Availability

CAT6219-280MV2T3 is available at Aetrix Electronics and suitable for smartphone baseband power, wireless audio codec biasing, medical sensor analog supplies, and industrial LoRaWAN node regulation requiring stable component supply across long production lifecycles.

Supply support for CAT6219-280MV2T3 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, serving automotive, industrial, cloud, and intelligent power markets.

The CAT6219 series belongs to onsemi's precision LDO portfolio, engineered specifically for battery-powered portable devices demanding low noise, fast transient response, and guaranteed 500 mA output in miniature WDFN and TSOT packages.

FAQ

What is the maximum input voltage rating for CAT6219-280MV2T3?

The CAT6219-280MV2T3 has an absolute maximum input voltage (VIN) rating of 6.5 V. However, its recommended operating input range is 2.3 V to 5.5 V. Exceeding 5.5 V may cause reliability degradation or immediate failure, especially at elevated temperatures. Operation above 5.5 V voids warranty and violates safe operating area limits defined in Table 2 of the datasheet.

Does CAT6219-280MV2T3 require an external bypass capacitor for basic operation?

No, the CAT6219-280MV2T3 functions correctly without an external bypass capacitor on the BYP pin. The 10 nF capacitor is optional and used solely to improve PSRR and reduce output noise-particularly beneficial in RF or audio applications. Omitting it does not affect regulation, stability, or enable functionality, but PSRR drops to 40 dB at 1 kHz.

How is thermal performance managed in the WDFN-6 package of CAT6219-280MV2T3?

The CAT6219-280MV2T3 WDFN-6 package incorporates an exposed thermal pad (DAP) sized 1.8 mm × 1.2 mm. For optimal thermal performance, this pad must be soldered to a dedicated PCB copper pour connected to the ground plane using ≥4 thermal vias. With proper layout, θJA is 206 °C/W, enabling 500 mA operation up to +85 °C ambient before thermal shutdown activates at 160 °C junction temperature.

Can CAT6219-280MV2T3 be used with ceramic capacitors smaller than 2.2 µF?

No-stable operation of CAT6219-280MV2T3 requires a minimum 2.2 µF ceramic output capacitor (X5R or X7R dielectric) with ESR between 5 mΩ and 500 mΩ. Using smaller values risks oscillation or excessive output voltage overshoot during load transients. The 2.2 µF value is validated across temperature and voltage for phase margin >45°, as confirmed in Figure 5 and Table 4 of the datasheet.

What happens to the output of CAT6219-280MV2T3 when the EN pin is left floating?

When the EN pin is left floating, the internal 2.5 MΩ pull-down resistor forces the enable input below 0.4 V, placing CAT6219-280MV2T3 into shutdown mode. In this state, VOUT is disabled, ground current drops to ≤2 µA, and the output capacitor discharges via the internal 250 Ω switch. This fail-safe behavior prevents unintended power-up and ensures predictable system power sequencing.