L1188_12 Datasheet, PDF (4/4 Pages) Unisonic Technologies – 800mA CMOS LDO

L1188
Preliminary
„ TYPICAL APPLICATION CIRCUIT
CMOS IC
„ APPLICATION INFORMATION
1. Detailed Description
Internal circuits include: a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and
thermal shutdown.
The data through the error amplifier, over-current shutdown, and thermal protection circuits, then to the
P-channel pass transistor.
As soon as the junction temperature exceeds 150°C or the current exceeds 900mA, over-current and thermal
shutdown circuits start working. When the junction temperature drops below 120°C, normal operation is restored.
When the load exceeds the rated output current, for preventing the over stress, the chip switches from voltage
mode to current mode.
2. External Information
When considering the external capacitors, the L1188 is stable with an output capacitor to ground of 2.2μF or
greater. As we know, the ceramic capacitors have the lowest ESR but can offer the best AC performance; the
aluminum electrolytic capacitors exhibit the highest ESR but offer the poorest AC response. And also large value
ceramic capacitors are expensive. Consider all the situation, the best way is to parallel a 0.1μF ceramic capacitor with
a 10μF Aluminum Electrolytic (low ESR, high capacitance, and low overall cost).
For better beneficial effecting, the input capacitor should be at least 0.1μF.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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