L4987CXX Datasheet, PDF (1/16 Pages) STMicroelectronics – Dropout control flag

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
PPAK
■ Logic-controlled electronic shutdown
t(s) ^{■ Output voltages of 3.3 V, 5 V}
■ Internal current and thermal limit
uc _{■ Only 2.2 µF for stability}
rod ^{■ Available in ± 2% selection at 25°C}
P ■ Supply voltage rejection: 70 dB (typ.)
lete ^Description
so The L4987 is a very low drop regulator available
b _{in PPAK. The very low drop-voltage (0.5 V Max at}
O _{200 mA) and the very low quiescent current make}
- _{it particularly suitable for low noise, low power}
t(s) ^{applications, and in battery powered systems.}
The input dump protection up to 40 V makes it
c _{ideal for automotive applications. a shutdown}
du ^{Logic Control function is available (pin 2, TTL}
ro ^{compatible). This means that when the device is}
used as a local regulator, it is possible to put a
P _{part of the board in standby, decreasing the total}
te _{power consumption. The regulator employs an}
le output pin (open collector) providing a logic signal
o _{when the pass transistor is in saturation at low}
bs ^{input voltage, this signal can be used to prevent}
O^{the pop-up phenomenon in the car radio. In}
notebook) it is possible to use the flag to monitor
the battery charge status through the dropout of
the regulator.
battery powered systems (the cellular phone,
Table 1.
Device summary
Part number
L4987Cxx33
L4987Cxx50
Order code
L4987CPT33TR
L4987CPT50TR
Output voltage
3.3 V
5.0 V
September 2007
Rev. 6
1/16
www.st.com
16