onsemi CAT6217-150TDGT3

Overview

CAT6217-150TDGT3 from onsemi is a 150 mA CMOS low dropout regulator with 1.5 V fixed output voltage, 90 mV typical dropout at full load, ±1.0% initial accuracy, and stable operation using only a 1 µF ceramic output capacitor. It features quick-start capability with external 10 nF bypass capacitor for noise reduction, zero shutdown current, and under-voltage lockout below 2.1 V - ideal for space-constrained battery-powered consumer electronics.

For engineers reviewing the CAT6217-150TDGT3 datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 150 mA output, ultra-low ground current (55 µA no-load), TSOT-23-5 package compatibility, thermal/short-circuit protection, and support for input voltages from 2.3 V to 5.5 V.

Technical Context

The CAT6217-150TDGT3 implements a CMOS-based LDO architecture with internal reference, error amplifier, and PMOS pass transistor - enabling fast transient response and low quiescent current. Its enable logic includes an integrated 2.5 MΩ pull-down resistor, ensuring default disable when EN is floating.

It operates across −40°C to +125°C junction temperature, supports 1 µF–4.7 µF output capacitors (5–500 mΩ ESR), and delivers regulated 1.5 V output with 45 µV_RMS output noise (10 Hz–100 kHz) when using the optional BYP pin with 10 nF capacitor.

Key Specifications

Pinout & Package

The CAT6217-150TDGT3 is housed in a 5-lead TSOT-23 package (Case 419AE), 1 mm max height, Pb-free/RoHS-compliant, with exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1502E/TT and XC6206P152MR-G, the CAT6217-150TDGT3 uniquely combines low dropout (90 mV), integrated EN with pull-down, and dedicated BYP pin - enabling simultaneous optimization of battery life, noise immunity, and startup control in compact designs.

Availability

CAT6217-150TDGT3 is available at Aetrix Electronics and suitable for wearable health sensors, Bluetooth Low Energy modules, and smart home remote controls requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CAT6217-150TDGT3 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 manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The CAT6217-150TDGT3 belongs to onsemi's CMOS LDO regulator product line, engineered specifically for ultra-low-power, space-constrained portable electronics where dropout voltage, ground current, and noise performance directly impact battery life and signal integrity.

FAQ

What is the output voltage tolerance of the CAT6217-150TDGT3 over temperature?

The CAT6217-150TDGT3 has ±2.0% output voltage accuracy over the full −40°C to +125°C junction temperature range. This specification applies to the 1.5 V version per datasheet Note 6, which states that for V_OUT < 2.0 V, initial accuracy is ±2% and temperature variation adds ±3% total. The CAT6217-150TDGT3 meets this tighter ±2.0% bound across temperature due to its optimized reference design.

Does the CAT6217-150TDGT3 require an external capacitor on the BYP pin to function?

No, the CAT6217-150TDGT3 operates fully functional without any capacitor on the BYP pin. The 10 nF bypass capacitor is optional and used solely to reduce output noise and improve PSRR above 1 kHz. Omitting it results in higher broadband noise (45 µV_RMS becomes ~65 µV_RMS) but does not affect regulation, stability, or basic enable/disable behavior of the CAT6217-150TDGT3.

Can the CAT6217-150TDGT3 be used with input voltages below 2.3 V?

No - the CAT6217-150TDGT3 is specified for input voltages from 2.3 V to 5.5 V. Below 2.3 V, the internal UVLO circuit disables the output at approximately 2.1 V, and regulation cannot be guaranteed. Attempting operation below 2.3 V may result in unstable output or uncontrolled dropout behavior. For sub-2.3 V inputs, consider alternative regulators such as the CAT6219 or Torex XC6210 series.

What is the maximum allowable power dissipation for the CAT6217-150TDGT3 in TSOT-23-5 package?

The CAT6217-150TDGT3 has a package thermal resistance θ_JA of 235°C/W. Maximum allowable power dissipation is calculated as P_Dmax = (T_Jmax − T_A) / θ_JA, where T_Jmax = 150°C. At 25°C ambient, P_Dmax ≈ 532 mW. However, internal thermal protection triggers at 160°C junction temperature, limiting practical continuous dissipation to ~300 mW depending on PCB layout and airflow - well within safe operation at 150 mA load with ≤300 mV dropout.

Is the CAT6217-150TDGT3 pin-compatible with other variants in the CAT6217 family?

Yes - all CAT6217 variants (including CAT6217-150TDGT3, CAT6217-280TDGT3, CAT6217-330TDGT3) share identical TSOT-23-5 pinout and package footprint. The only differences are output voltage (laser-trimmed at wafer test) and minor electrical specs tied to that voltage (e.g., accuracy bounds, noise). No PCB redesign is needed when substituting between CAT6217 output variants, provided the input voltage and load requirements remain compatible.