SRAH-07A1A00

Current - Output (Max):	7A
Control Features:	Enable, Active High
Size / Dimension:	0.78" L x 0.70" W x 0.32" H (19.7mm x 17.8mm x 8.1mm)
Package / Case:	7-SMD Module
Mounting Type:	Surface Mount
Efficiency:	88%
Operating Temperature:	-40°C ~ 85°C
Features:	Remote On/Off, OCP, SCP, UVLO
Applications:	ITE (Commercial)
Power (Watts):	23W
Series:	xRAH-07A1A0
Voltage - Output 3:	--
Voltage - Output 2:	--
Voltage - Output 1:	0.9 ~ 3.3 V
Voltage - Input (Max):	14V
Voltage - Input (Min):	10V
Number of Outputs:	1
Type:	Non-Isolated PoL Module
Part Status:	Obsolete
Packaging:	Tube

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DC DC Converters: SRAH-07A1A00 Application Field and Working Principle

DC-DC converters are devices used to convert direct current with one voltage level into a different direct current with a different voltage level. Switching regulators (or switching power supply) is the term typically used for describing integrated circuits (IC) or systems that convert an input voltage (or current) to a higher or lower output voltage (or current). It is a particularly important application field of modern electronics since the batteries used for most portable devices require to be recharged through a low voltage source such as USB, solar cells, or any other suitable low voltage source. The SRAH-07A1A00 is designed to convert a nominal 3.7V LiPo battery input voltage to a stable 5V output voltage. The efficiency of the conversion is 80-85% depending on the load. It is a tiny high-performance DC/DC step-up/step-down switching converter. It integrates a current mode step-up/step-down converter, a low dropout regulator, and a battery level detection circuit.The SRAH-07A1A00 works in two main modes: step-up/step-down and battery level detection. In the step-up/step-down mode, the device takes an input voltage between 3.2V and 4.3V and generates a regulated 5V output with up to 200mA of output current. The battery level detection mode monitors the input voltage and switches off the load if the voltage falls below a set threshold.The SRAH-07A1A00 incorporates a fixed-frequency current-mode boost/buck PWM controller, a power MOSFET, a blocking diode, and various loop components to implement the desired step-up/step-down conversion. The voltage regulation loop of the device is based on current-mode control. The circuit can switch between step-up and step-down operation by loading the output capacitor and generates a controlled output voltage ripple by rhythmic modulation of the average output current. This helps reduce ripple voltage and improve efficiency.The SRAH-07A1A00 also incorporates a low dropout voltage regulator that provides regulation accuracy of 0.5V. The regulator implements a negative output voltage feedback loop which is enabled only when the input voltage is higher than the output voltage. The voltage regulation loop has an operating range from 0.5V up to 6V.The SRAH-07A1A00 has several limitations that must be taken into consideration while using the device. The input voltage—output voltage differential must be greater than 4.5V for the switch mode operation. Additionally, for maximum performance, the input capacitor should have a value of 470uF, and a 10 uF ceramic capacitor needs to be connected in parallel with the input capacitor for optimal stability. In conclusion, the SRAH-07A1A00 is a versatile switching regulator that offers a wide range of features. It incorporates a fixed-frequency current-mode boost/buck PWM controller, a power MOSFET, a blocking diode, and various loop components to implement a step-up/step-down conversion. It can also switch off the load when the battery voltage falls below a set threshold, which allows for a longer device life. The device has excellent efficiency and an operating temperature range from -40°C to 85°C which makes it well-suited for use in harsh environments.

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