TMR 9-4821

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DC-DC converters are used in many applications, ranging from communications and consumer electronics to industrial and automotive applications. The use of a DC-DC converter provides many benefits such as size reduction, increased efficiency, and improved noise immunity. One of the most popular products is the TMR 9-4821. This device is a low-power, low-temperature, fully integrated step-up DC-DC converter, with integrated switch and Schottky diode. It was developed to provide a highly efficient alternative for powering low-power devices from a Li-Ion battery.

The TMR 9-4821 is ideal for portable devices since it can generate voltages up to 6V with just a single cell battery. It offers very low 0.2 Ω (200 mΩ) internal resistance, with the capability to drive up to 1A of output current with input voltages as low as 2.2V. Additionally, the device functions over an extended temperature range (from -40°C to 85°C) making it suitable for even the harshest operating environments. The device features an integrated power MOSFET switch, as well as reverse-current protection and cycle-by-cycle current limit protection.

The device includes an on-chip charging circuit for the external capacitor. Upon start-up, the internal circuit powers up the high-side MOSFET quickly, followed by the low-side MOSFET. After the MOSFETs turn on, the voltage controller then charges the external capacitor to switch the system to its normal operating mode. When the system is in normal mode, the output voltage is regulated by varying the frequency of the power MOSFET switches.

The TMR 9-4821\'s switching frequency can be set using an external resistor connected to the FS pin. This allows the user to determine the frequency of operation, in order to optimize efficiency, power dissipation, or other requirements. Once the frequency is set, the device begins to modulate the MOSFETs to maintain the output voltage at the set-point. If the load current decreases, the MOSFETs will begin to switch more slowly, thus reducing the output voltage.

In addition to its excellent performance features, the TMR 9-4821 has a very small form factor, making it ideal for use in portable applications. It has a tiny 3.3 mm × 3.3 mm package, which makes it ideal for small devices with very limited space. It is also one of the few DC-DC converters available with an external capacitor, giving it superior transient response and improved noise immunity.

Overall, the TMR 9-4821 is one of the most popular DC-DC converters available today due to its improved efficiency, low internal resistance, extended temperature range, and small size. It is a great choice for powering low-power devices from a Li-Ion battery, offering the user a highly efficient solution that is easy to implement and use.

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