LF00 series
Very low drop voltage regulators with inhibit
Features
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Very low dropout voltage (0.45V)
Very low quiescent current (TYP. 50 µA in OFF
mode, 500 µA in ON mode)
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;
4; 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
PPAK
DPAK
PENTAWATT
TO-220
TO-220FP
suitable for Low Noise, Low Power applications
and specially in battery powered systems.
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.
Description
The LF00 series 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
Schematic diagram
May 2007
Rev. 17
1/46
www.st.com
46
LF00 series
Contents
1
2
3
4
5
6
7
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Order code
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
2/46
Maximum ratings
LF00 series
2
Table 1.
Maximum ratings
Absolute maximum ratings
Parameter
DC Input Voltage
Output Current
Power Dissipation
Storage Temperature Range
Operating Junction Temperature Range
Value
-0.5 to 40
(1)
Internally Limited
Internally Limited
-40 to 150
-40 to 125
°C
°C
Unit
V
Symbol
V
I
I
O
P
TOT
T
STG
T
OP
1. For 18 < V
I
< 40 the regulator is in shut-down
Table 2.
Symbol
R
thJC
R
thJA
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
PENTAWATT
3
50
TO-220
3
50
TO-220FP
5
60
DPAK/PPAK
8
100
Unit
°C/W
°C/W
Figure 2.
Test circuit
4/46
LF00 series
Electrical characteristics
3
Table 3.
Symbol
V
O
V
I
I
O
ΔV
O
ΔV
O
Electrical characteristics
Electrical characteristics for LF15AB
(refer to the test circuits, T
J
= 25°C, C
I
= 0.1 µF, C
O
= 2.2
μF
unless otherwise specified.)
Parameter
Output voltage
Operating input voltage
Output current limit
Line regulation
Load regulation
V
I
= 2.5 to 16 V, I
O
= 5 mA
V
I
= 2.8 V, I
O
= 5 to 500 mA
V
I
= 2.5 to 16V, I
O
= 0mA
I
d
Quiescent current
V
I
= 2.8 to 16V, I
O
=500mA
V
I
= 6 V
OFF MODE
f = 120 Hz
SVR
Supply voltage rejection
I
O
= 5 mA, V
I
= 3.5 ± 1 V
f = 1 KHz
f = 10 KHz
eN
V
d
V
IL
V
IH
I
I
C
O
Output noise voltage
Dropout voltage
Control input logic low
Control input logic high
Control input current
Output bypass
capacitance
B = 10 Hz to 100 KHz
I
O
= 200 mA
T
a
= -40 to 125°C
T
a
= -40 to 125°C
V
I
= 6 V, V
C
= 6 V
ESR = 0.1 to 10
Ω
I
O
= 0 to 500 mA
,
2
2
10
10
50
82
77
65
50
1
0.8
µV
V
V
V
µA
µF
dB
ON MODE
12
100
µA
Test conditions
I
O
= 50 mA, V
I
= 3.5 V
I
O
= 50 mA, V
I
= 3.5 V, T
a
= -25 to 85°C
I
O
= 500 mA
Min.
1.485
1.470
2.5
1
2
2
0.5
10
10
1
mA
Typ.
1.5
Max.
1.515
V
1.530
16
V
A
mV
mV
Unit
5/46
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