Overview
The LMZ20502, produced by Texas Instruments, is a 2-A synchronous step-down DC/DC converter integrated into a compact nano module package. This device is designed to provide high efficiency and output accuracy, making it ideal for space-constrained applications. The LMZ20502 operates with an input voltage range of 2.7V to 5.5V and can produce an adjustable output voltage from 0.8V to 3.6V. It features a 3.5mm x 3.5mm x 1.75mm package, which includes both the regulator and inductor, thus saving board space and simplifying the design process.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 2.7 to 5.5 | V |
| Output Voltage Range | 0.8 to 3.6 | V |
| Maximum Output Current | 2 | A |
| Switching Frequency | 3 MHz (typ.) | Hz |
| Junction Temperature Range | -40 to 125 | °C |
| Quiescent Current in Shutdown | 2.4 µA (max) | A |
| Feedback Tolerance Over Temperature | ± 1% | % |
| Thermal Resistance (Junction-to-Ambient) | 42.6 | °C/W |
Key Features
- Internal synchronous rectifier using an NMOS FET to increase efficiency.
- Pin-selectable switching modes: Forced PWM and AUTO mode with PFM at light loads.
- Internal compensation and soft start to prevent large inrush currents and output overshoots.
- Current limit, thermal shutdown, and undervoltage lockout (UVLO) protection.
- Power Good flag function for monitoring output voltage.
- Nano scale package with integrated inductor, saving board space.
- Simple PCB layout with only five external components required.
- Compatibility with TI's WEBENCH® Power Designer for custom design and optimization.
Applications
- Point of Load (POL) regulation in various electronic systems.
- Space-constrained applications such as handheld devices, portable electronics, and embedded systems.
Q & A
- What is the input voltage range of the LMZ20502?
The input voltage range is from 2.7V to 5.5V.
- What is the maximum output current of the LMZ20502?
The maximum output current is 2 A.
- What are the switching modes available in the LMZ20502?
The LMZ20502 operates in Forced PWM mode and AUTO mode with Pulse Frequency Modulation (PFM) at light loads.
- What is the thermal resistance (Junction-to-Ambient) of the LMZ20502?
The thermal resistance is 42.6 °C/W.
- Does the LMZ20502 have built-in protection features?
Yes, it includes current limit, thermal shutdown, and undervoltage lockout (UVLO) protection.
- How does the LMZ20502 handle start-up and shutdown?
Start-up and shutdown are controlled by the EN input, with a current limit based soft-start to prevent large inrush currents and output overshoots.
- What design tools are available for the LMZ20502?
Texas Instruments' WEBENCH® Power Designer can be used to create and optimize designs using the LMZ20502.
- What is the package size of the LMZ20502?
The package size is 3.5mm x 3.5mm x 1.75mm.
- How many external components are required for a complete power supply using the LMZ20502?
Only five external components are required: feedback resistors, input and output filter capacitors, and optional components for additional features.
- What is the feedback tolerance over temperature for the LMZ20502?
The feedback tolerance over temperature is ± 1%.
