SP7656EN2-L/TR

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DC-DC switching regulators offer many benefits, including a wide variety of operating voltages and current, low noise, and an average efficiency of 80-90%, making them suitable for many applications. SP7656EN2-L/TR is a type of DC-DC switching regulator which provides voltage conversion with either step-up or step-down capability. This regulator is available in both SOT-23 and SOT-323 packages.

This switching regulator is designed to meet a variety of application requirements, including low-power, high-speed, isolated, automotive, and industrial applications. Its main features are very low quiescent current (IQ<1μA), fast transient response (1μs), low operating voltage (2.4V-5.5V), low output ripple (20mV typ) and small package size (SOT-23 or SOT-323). Additionally, it can be used for DC-DC step-up or step-down applications.

The working principle of SP7656EN2-L/TR can be understood with reference to its simple block diagram (Figure 1). The core regulator consists of two interconnected feedback units, one operating in pulse width modulation (PWM) mode and the other operating in low power burst mode. The PWM input consists of the bias voltage (Vbias) and the feedback voltage (Vfb). The output consists of the regulated output voltage (Vout) and the current set terminal (Iset).

Figure 1: Block diagram of SP7656EN2-L/TR

The PWM output is then connected to the low power-discharge switch, which is controlled by the low power-discharge (LD) pin. When the LD pin is low, it enables the discharge switch which feeds back the output voltage to the circuit, thereby reducing the output voltage. The discharge switch also allows the converter to achieve fast transient response and low ripple rate. The bias voltage (Vbias) is used to control the overall power efficiency of the circuit and is usually regulated by a low-dropout regulator (LDO) which is connected to the input voltage.

The feedback unit controls the output voltage. It consists of a resistor divider connected to the set terminal. A signal from the set terminal is fed back to the regulator, which then adjusts the duty cycle of the PWM output until the output voltage is equal to the reference voltage. The current set terminal (Iset) is used to adjust the output current from the converter. It is connected to a current sense resistor, which is used to measure the output current. The output voltage and the current set voltage are compared to the reference voltage and the desired current level respectively and suitable compensation parameter EP can then be calculated.

The SP7656EN2-L/TR is suitable for a wide variety of power management applications, especially those in low power, high speed, automotive and industrial sectors. Its wide input/output range, low quiescent current, fast transient response and small package size makes it suitable for applications where space is a constraint. In addition, the integrated low current burst and pulse width modulation mode operation ensures good efficiency, even at low load currents. The ability to adjust the output current of the converter makes it suitable for applications where the load current changes frequently.

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