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LF120AB Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer LF120AB
Beschreibung Very low drop voltage regulator
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 30 Seiten
LF120AB Datasheet, Funktion
LFXX
Very low drop voltage regulator with inhibit function
Datasheet - production data
Features
Very low-dropout voltage (0.45 V)
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; 3.3; 4.7; 5;
6; 8; 8.5; 9; 12 V
Automotive grade product: 1.8 V, 2.5 V,
3.3 V, 5.0 V, 8.0 V, 8.5 V VOUT in DPAK and
PPAK packages
Internal current and thermal limit
Only 2.2 µF for stability
Available in ±1% (AB), ±1.5% (AC) or
±2% (C) selection at 25 °C
Supply voltage rejection: 80 db (typ.)
Temperature range: from -40 to 125 °C
Description
The LFXX is a very low drop regulator available
in TO-220, TO-220FP, DPAK and PPAK
packages and in a wide range of output voltages.
The low drop voltage (0.45 V) and low quiescent
current make it particularly suitable for low-noise,
low-power applications and especially in battery-
powered systems. In the 5 pin configuration
(PPAK) a shutdown logic control function is
available (pin 2, TTL compatible). This means
that when the device is used as a local regulator,
a part of the board can be put in standby,
decreasing the total power consumption. In the
three terminal configuration, the device has the
same electrical performance, but it is fixed in ON
state. It requires a capacitor of only 2.2 µF for
stability, saving board space and costs. The
LFXX is available as automotive grade in DPAK
and PPAK packages, for the options of output
voltages whose commercial part numbers are
shown in the order codes. These devices are
qualified according to the specification
AEC-Q100 of the automotive market, in the
temperature range -40 °C to 125 °C, and the
statistical tests PAT, SYL, SBL are performed.
May 2017
DocID2574 Rev 31
This is information on a product in full production.
1/53
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LF120AB Datasheet, Funktion
Electrical characteristics
LFXX
4 Electrical characteristics
Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Table 3: LF15AB electrical characteristics
Symbol
Parameter
Test condition
Min. Typ. Max. Unit
VO Output voltage
VI Operating input voltage
IO Output current limit
∆VO Line regulation
∆VO Load regulation
Id Quiescent current
SVR Supply voltage rejection
IO = 50 mA
VI = 3.5 V
IO = 50 mA
VI = 3.5 V
Ta = -25 to 85 °C
IO = 500 mA
VI = 2.5 to 16 V
IO = 5 mA
VI = 2.8 V
IO = 5 to 500 mA
VI = 2.5 to 16 V
IO = 0 mA
VI = 2.8 to 16 V
IO = 500 mA
VI = 6 V
IO = 5 mA
VI = 3.5 ± 1 V
1.485 1.5 1.515
1.470
1.530
V
2.5
1
2
16 V
A
10 mV
2 10 mV
ON mode
OFF mode
f = 120 Hz
f = 1 kHz
f = 10 kHz
0.5 1
12
50 100
82
77
65
mA
µA
dB
eN Output noise voltage
B = 10 Hz to 100 kHz
50 µV
Vd Dropout voltage
VIL Control input logic low
VIH Control input logic high
II Control input current
CO
Output bypass
capacitance
IO = 200 mA
Ta = -40 to 125 °C
Ta = -40 to 125 °C
VI = 6 V
VC = 6 V
ESR = 0.1 to 10 Ω
IO = 0 to 500 mA
1V
0.8 V
2V
10 µA
2 10
µF
6/53 DocID2574 Rev 31

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LF120AB pdf, datenblatt
Electrical characteristics
LFXX
Refer to test circuits, TJ = 25 °C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified.
Symbol
Parameter
Table 9: LF25C electrical characteristics
Test condition
Min.
Typ. Max. Unit
VO
VI
IO
∆VO
∆VO
Id
SVR
Output voltage
Operating input voltage
Output current limit
Line regulation
Load regulation
Quiescent current
IO = 50 mA
VI = 4.5 V
IO = 50 mA
VI = 4.5 V
Ta = -25 to 85 °C
IO = 500 mA
VI = 3.5 to 16 V
IO = 5 mA
VI = 3.8 V
IO = 5 to 500 mA
VI = 3.5 to 16 V
IO = 0 mA
VI = 3.8 to 16 V
IO = 500 mA
VI = 6 V
Supply voltage rejection IO = 5 mA
VI = 4.5 ± 1 V
ON mode
OFF mode
f = 120 Hz
f = 1 kHz
f = 10 kHz
2.45 2.5 2.55
V
2.4 2.6
16 V
1A
2 12 mV
2 12 mV
0.5 1
mA
12
50 100 µA
82
77 dB
65
eN Output noise voltage
B = 10 Hz to 100 kHz
50 µV
Vd Dropout voltage
IO = 200 mA
IO = 500 mA
VIL Control input logic low Ta = -40 to 125 °C
VIH Control input logic high Ta = -40 to 125 °C
II
Control input current
VI = 6 V
VC = 6 V
CO
Output bypass
capacitance
ESR = 0.1 to 10 Ω
IO = 0 to 500 mA
0.2 0.35
0.4 0.7
V
0.8 V
2V
10 µA
2 10
µF
12/53
DocID2574 Rev 31

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