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STMicroelectronics
STMicroelectronics

LFxxC Datasheet

Very low drop voltage regulators


LFxxC Datasheet Preview


LFxxAB
LFxxC
Very low drop voltage regulators with inhibit
Features
Very low dropout voltage (0.45V)
Very low quiescent current (typ. 50 µA in OFF
mode, 500 µA in ON mode)
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Output current up to 500 mA
Logic-controlled electronic shutdown
Output voltages of 1.5; 1.8; 2.5; 2.7; 3; 3.3; 3.5;
5; 6; 8; 8.5; 9; 12V
Internal current and thermal limit
Only 2.2 µF for stability
Available in ± 1% (AB) or ± 2% (C) selection at
25°C
Supply voltage rejection: 80db (typ.)
Temperature range: -40 to 125°C
Description
The LFxxAB/LFxxC are very Low Drop regulators
available in PENTAWATT, TO-220, TO-220FP,
DPAK and PPAK package and in a wide range of
output voltages.
The very Low Drop voltage (0.45V) and the very
low quiescent current make them particularly
suitable for Low Noise, Low Power applications
and specially in battery powered systems.
TO-220
TO-220FP
PPAK
DPAK
PENTAWATT
In the 5 pins configuration (PENTAWATT and
PPAK) 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. In the
three terminal configuration the device has the
same electrical performance, but is fixed in the
ON state. It requires only a 2.2 µF capacitor for
stability allowing space and cost saving.
Table 1. Device summary
LF15C
LF15AB
LF18C
LF18AB
LF25C
LF25AB
LF27C
LF27AB
LF30C
LF30AB
LF33C
LF33AB
LF35C
LF35AB
Order codes
LF40C
LF40AB
LF50C
LF50AB
LF60C
LF60AB
LF80C
July 2007
Rev. 18
LF80AB
LF85C
LF85AB
LF90C
LF90AB
LF120C
LF120AB
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Contents
LFxxAB - LFxxC
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
2/45
Page 2

LFxxAB - LFxxC
1 Diagram
Figure 1. Block diagram
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Diagram
3/45
Page 3
Part Number LFxxC
Manufactur STMicroelectronics
Description Very low drop voltage regulators
Total Page 30 Pages
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