LM2587T-5.0

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The LM2587T-5.0 is a monolithic step-down switchmode voltage regulator with an adjustable output voltage range of 1.235 V to 37 V, with a constant 5.0 A output current over an input voltage range of 6V to 40 V. It is available in several package types and offers both current and voltage control as well as thermal shutdown capability. It is suitable for board level applications where cost and space are of paramount concern.

The voltage regulator is an essential device in any power system. It helps maintain a steady voltage level across a circuit and provides protection against over-voltage and over-current conditions. The LM2587T-5.0 is a well-suited voltage regulator for many power applications due to its ability to provide a wide input voltage range, adjustable output voltage range, high accuracy and low quiescent current.

The LM2587T-5.0 features a wide input voltage range of 6V to 40V and the output voltage is adjustable from 1.235V to 37V. It features complete undervoltage lockout, easy current limit, wide operating temperature range and thermal shutdown protection. Its quiescent current is typically just 37μA in operating mode and 0.8μA in shut-down mode.

The regulated output voltage is monitored by a bandgap voltage reference, while an external resistor net-work is used to set the desired voltage. The loading conditions are monitored by a current sense transistor, which is internally connected to the current limit comparator. The LM2587T-5.0 is also constructed with internal MOSFETs switches to provide a high switching frequency of up to 500 KHz, thus reducing the switching losses. An external clock signal can be used to override the internal oscillator if greater flexibility is required.

The LM2587T-5.0 requires an external filter capacitor at the output. This can be selected based on the total capacitance (Cout+ Cer) at the output due to its high frequency operation, which helps in reducing EMI and other switch-mode power supply associated problems. The capacitor Cer should be chosen according to the ESR and dampening requirements.

The LM2587T-5.0 is ideal for a wide range of applications such as DC/DC converters, battery chargers, DC power supplies and voltage stabilizers, PoE (Power over Ethernet) systems, automotive automotive and industrial applications. It offers better energy efficiency and improved performance over other types of voltage regulators. This makes it the perfect choice for cost-sensitive designs that require a wide output voltage range.

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