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L4987CXX Datasheet(PDF) 1 Page - STMicroelectronics |
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L4987CXX Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 16 page  September 2007 Rev. 6 1/16 16 L4987Cxx Very low drop voltage regulators with inhibit and dropout control flag Features ■ Very low dropout voltage (0.25 V typ.) ■ Dropout control flag ■ Very low quiescent current ■ (Typ. 90 mA in OFF Mode, 500 mA in ON Mode) ■ Output current up to 200 mA ■ Logic-controlled electronic shutdown ■ Output voltages of 3.3 V, 5 V ■ Internal current and thermal limit ■ Only 2.2 µF for stability ■ Available in ± 2% selection at 25°C ■ Supply voltage rejection: 70 dB (typ.) Description The L4987 is a very low drop regulator available in PPAK. The very low drop-voltage (0.5 V Max at 200 mA) and the very low quiescent current make it particularly suitable for low noise, low power applications, and in battery powered systems. The input dump protection up to 40 V makes it ideal for automotive applications. a shutdown Logic Control function is available (pin 2, TTL compatible). This means that when the device is used as a local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The regulator employs an output pin (open collector) providing a logic signal when the pass transistor is in saturation at low input voltage, this signal can be used to prevent the pop-up phenomenon in the car radio. In battery powered systems (the cellular phone, notebook) it is possible to use the flag to monitor the battery charge status through the dropout of the regulator. PPAK Table 1. Device summary Part number Order code Output voltage L4987Cxx33 L4987CPT33TR 3.3 V L4987Cxx50 L4987CPT50TR 5.0 V www.st.com Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) |
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