There are many types of portable power ICs, and their common features are:
Low operating voltage
Generally portable operating voltage is 3.0 ~ 3.6V. Some have lower operating voltages, such as 2.0, 2.5, 2.7V, etc.; there are also some operating voltages of 5V, and a few 12V or 28V special-purpose voltage sources.
Operating current is not large
Portable electronic products range from a few milliamps to a few amps, but can be roughly divided into five categories, as shown in Table 1.
Since most portable electronic products operate at less than 300 mA, 30 to 300 mA power ICs account for a large proportion of the variety and quantity.
Small package size
In recent years, portable products have been developed using chip devices, and power ICs are no exception. The main products are SO package, SOT-23 package, μMAX package and SC-70 with the smallest package size and the latest SMD package. The space is getting smaller and smaller.
Perfect protection measures
The new power IC has perfect protection measures, including: output overcurrent limit, overheat protection, short circuit protection and battery polarity reverse protection, making the power supply safe and reliable, and not easy to damage.
Low power consumption and power off function
The quiescent current of the new power IC is small, typically tens of μA to several hundred μA. Individual micropower linear regulators have a quiescent current of only 1.1μA. In addition, many power ICs have the function of turning off the power control terminal (using level control), and the IC itself consumes about 1μA when the power is turned off. Since it can make some circuits inoperative, it can save a lot of power. For example, on a wireless communication device, the receiving circuit can be turned off in the transmitting state; the display circuit or the like can be turned off when no signal is received.
Power supply status signal output
Many portable electronic products have a single-chip microcomputer. When the power supply is lowered by a certain percentage due to overheating or low battery voltage, the power supply IC has a power supply working state signal that is sent to the single-chip microcomputer to reset the single-chip microcomputer. This signal can also be used to indicate the power supply status (when the battery is low voltage, there is an LED display).
High output voltage accuracy
The general output voltage accuracy is between ±2% and 4%, and many new power ICs have an accuracy of ±0.5 to ±1%; and the output voltage temperature coefficient is small, generally ±0.3 to ±0.5 mV/°C. Some can reach levels of ±0.1mV/°C. The linear adjustment rate is generally 0.05% to 0.1%/V, and some can reach 0.01%/V; the load regulation rate is generally 0.3 to 0.5%/mA, and some can reach 0.01%/mA.
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