Special power supplies can be subdivided into: shore power, security power, high voltage power, medical power, military power, aerospace power, laser power, and other special power supplies.
(1) Low operating voltage
It is understood that the general working 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.
(2) The working current is not large
From a few milliamperes to a few amps, but because most embedded electronic products work less than 300mA, 30-300mA power ICs account for a large proportion of the variety and quantity.
(3) Small package size
In recent years, portable products have been developed using chip devices, and power ICs are no exception, mainly in SO package, SO T-23 package, μMAX package and SC-70 with the smallest package size and the latest SMD package. The space is getting smaller and smaller.
(4) 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.
(5) Low power consumption and power off function
The quiescent current of the new power ICs is small, typically tens of μA to hundreds of 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 (controlled by level), 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.
(5) There is power supply status signal output
Many portable electronic products have a single-chip microcomputer. When the power supply drops 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 (the LED is displayed when the battery is low voltage).
(6) 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.
(7) New combined power IC
The boost DC/DC converter has high efficiency but large ripple and noise voltage. The low dropout linear regulator has low efficiency but minimum noise. The combination of the two output power ICs can effectively solve the efficiency and noise. problem. For example, the digital circuit section uses a boost DC/DC converter power supply and the noise sensitive circuitry uses an LDO power supply. This power IC has MAX710/711, MAX1705/1706 and so on. Another example is a charge pump + LDO, output regulated charge pump power IC, such as the MAX868, which can output a stable voltage of 0 ~ -2VIN adjustable, and can provide 30mA current; MAX1673 regulated charge pump power IC The output has the same negative voltage as VIN, and the output current can reach 125mA.
Concerned about surprises
Label: Common features of power IC types
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