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L4987CPT33TR Datasheet

Very low drop voltage regulators

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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
ucOnly 2.2 µF for stability
rodAvailable in ± 2% selection at 25°C
PSupply voltage rejection: 70 dB (typ.)
leteDescription
soThe L4987 is a very low drop regulator available
bin PPAK. The very low drop-voltage (0.5 V Max at
O200 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
cideal for automotive applications. a shutdown
duLogic Control function is available (pin 2, TTL
rocompatible). This means that when the device is
used as a local regulator, it is possible to put a
Ppart of the board in standby, decreasing the total
tepower consumption. The regulator employs an
leoutput pin (open collector) providing a logic signal
owhen the pass transistor is in saturation at low
bsinput voltage, this signal can be used to prevent
Othe 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
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www.st.com
16


STMicroelectronics Electronic Components Datasheet

L4987CPT33TR Datasheet

Very low drop voltage regulators

No Preview Available !

Contents
L4987Cxx
1 Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Application hint of L4987CPT33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1 How to use the control flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ct(s)7 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
rodu8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Obsolete Product(s) - Obsolete P9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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Part Number L4987CPT33TR
Description Very low drop voltage regulators
Maker STMicroelectronics
Total Page 16 Pages
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