New from Linear Technology is the LTM8026, a 36 V input, 5 A step-down μModule regulator with an adjustable and ±10% accurate current limit. The current limit enables designers to set the maximum amount of power drawn from the supply, preventing input voltage droop caused by over-current conditions.
When multiple LTM8026s are configured with the outputs tied together, each converter can be programmed with a unique maximum current limit to meet its specific input supply limitations for greater output power, a technique known as asymmetric power sharing.
In contrast, common regulators must current share, a feature where each input supply contributes equally to the load, which is restricted by the least powerful input rail. Applications for the LTM8026 include point-of-load regulation in systems with 24 V and 12 V supplies such as VXI bus, for automotive, medical and industrial end-markets.
Like other μModule regulators, the device includes the DC/DC controller, power switches, power inductor, compensation and a modest amount of input and output capacitance in a surface mount package.
The current limit is adjustable by applying a voltage or resistor divider and can be automatically decreased with rising junction or ambient temperature using a thermistor to prevent the regulator or load from overheating.
The LTM8026 operates from an input voltage between 6 V and 36 V, and regulates an output voltage from 1,2 V to 24 V set by a single resistor. In a 12 V to 3,3 V output application, the IC achieves an operating efficiency of 89% at 2 A.
For noise-sensitive applications, the regulator can be synchronised to an external clock frequency in the range of 100 kHz to 1 MHz. Additional features include externally adjustable soft start, adjustable switching frequency and thermal shutdown.
The device is packaged in a thermally efficient 11,25 x 15 x 2,82 mm LGA package. Two temperature grades, E and I, covering the -40°C to +125°C temperature range, are available.
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