STMicroelectronics LK112S Datasheet
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LK112S
Low noise and low drop voltage regulator with shutdown function
Datasheet
-
production data
Description
SOT23-5L
The LK112S is a low-dropout linear regulator with shutdown function. The internal switch can be controlled by TTL or CMOS logic levels. The device is ON when the control pin is pulled to a high logic level. An external capacitor can be connected to the noise bypass pin to reduce the output noise level to 30 µVrms. An internal PNP pass transistor is used to achieve a low-dropout voltage.
Features
The LK112S has a very low quiescent current in
ON mode while in OFF mode the I
• Output current up to 200 mA
• Low-dropout voltage (500 mV max. at I
OUT
=
200 mA)
• Very low quiescent current: 0.1 µA in OFF mode and max. 250 µA in ON mode at I
OUT
= 0 mA
• Low output noise: typ. 30 µV at I
OUT
= 60 mA and 10 Hz < f < 80 kHz
• Wide range of output voltages
• Internal current and thermal limit
• V
OUT
tolerance ± 2% (at 25 °C)
• Operative input voltage from: V
OUT
+ 0.5 to 14
V (for V
OUT
> 2 V) or from 2.5 V to 14 V (for
V
OUT
< 2 V)
Table 1. Device summary q
is reduced to
100 nA max. The internal thermal shutdown circuitry limits the junction temperature below
150 °C. The load current is internally monitored and in the presence of a short-circuit or overcurrent conditions at the output, the device shuts down.
Part number Output voltage
LK112SM18TR
LK112SM33TR
LK112SM50TR
1.8 V
3.3 V
5.0 V
February 2014
This is information on a product in full production.
DocID8059 Rev 12 1/17 www.st.com
Contents
Contents
LK112S
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/17 DocID8059 Rev 12
LK112S
1 Diagram
Figure 1. Schematic diagram
Diagram
DocID8059 Rev 12 3/17
17
Pin configuration
2 Pin configuration
Figure 2. Pin connection (top view)
LK112S
Pin n°
1
2
3
4
5
Symbol
Table 2. Pin description
Note
SHDN
GND
Shutdown input disables the regulator when it is connected to GND or to a positive voltage lower than 0.6 V
Ground pin: internally connected to the die attach flag to decrease the total thermal resistance and increase the package ability to dissipate power
Bypass Bypass pin: 0.1 µF bypass to improve the thermal noise performance
OUT Output port
IN Input port
4/17 DocID8059 Rev 12
LK112S
3 Maximum
Symbol
V
I
V
SHDN
I
O
T
STG
T
OP
Maximum ratings
Table 3. Absolute maximum ratings
Parameter
DC input voltage
DC input voltage
Output current
Storage temperature range
Operating junction temperature range
Value
16
16
Internally limited
-55 to 150
-40 to 125
Unit
V
V
°C
°C
Symbol
R thJC
R thJA
Table 4. Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
SOT23-5L
81
255
Unit
°C/W
°C/W
DocID8059 Rev 12 5/17
17
Electrical characteristics LK112S
T
J
= 25 °C, V
IN
= V
OUT
+1 V, I
OUT
= 0 mA, V
SHDN
= 1.8 V, C
I
0.1 µF unless otherwise specified.
= 1 µF, C
O
= 2.2 µF, C
BYPASS
=
Parameter
Table 5. LK112S electrical characteristics
Test conditions Min.
Typ.
Max.
Unit Symbol
Δ
Δ
I
V
V
V
V d
O d
O
O
Quiescent current
Output voltage
Line regulation
Load regulation
Dropout voltage
ON mode (except I
SHDN
)
OFF mode, V
I
= 8 V, V
SHDN
= 0 V
I
O
= 30 mA
V
I
= V
O
+1 V to V
O
+6 V, V
O
≤ 5.6 V
V
I
= V
O
+1 V to V
O
+6 V, V
O
>
5.6 V
I
O
= 1 to 60 mA
I
O
= 1 to 200 mA
I
O
= 60 mA
I
O
= 200 mA
(1)
I
SC
Short-circuit current
I
V
SVR eN
SHDN
SHDN
Supply voltage rejection
Output noise voltage
Shutdown input current
Shutdown input logic
V
I
= V
O
+1.5 V, C
BYP
= 0.1 µF
C
O
= 10 µF, f = 400 Hz, I
O
= 30 mA
B= 10 Hz to 80 kHz, C
BYP
= 0.1 µF
C
O
= 10 µF, V
I
= V
O
+1.5 V, I
O
= 60 mA
V
SHDN
= 1.8 V, output ON
Output ON
Output OFF
Δ V
O
/T
J
Output voltage temperature coefficient
I
O
= 10 mA
1.
For versions with an output voltage higher than 2.1 V only.
-2
200
1.8
175
0
0.7
0.8
15
30
0.17
0.35
55
30
12
0.09
250
0.1
+2
20
40
30
90
0.24
0.5
35
0.6
dB
µVrms
µA
V mV/°C
µA
µA
% mV mV mV mV
V
V mA
Note: For versions with an output voltage lower than 2 V VIN = 2.4 V
6/17 DocID8059 Rev 12
LK112S Typical characteristics
(Unless otherwise specified, T
J
= 25 °C, C
I
= 1 µF, C
O
= 2.2 µF, C
BYP
= 100 nF)
Figure 3. Output voltage vs temperature
V out
=2.5 V
Figure 4. Output voltage vs temperature
V out
=3.8 V
Figure 5. Line regulation vs temperature Figure 6. Load regulation vs temperature
DocID8059 Rev 12 7/17
17
Typical characteristics LK112S
Figure 7. Dropout voltage vs temperature Figure 8. Short-circuit current vs dropout voltage
Figure 9. Output voltage vs input voltage Figure 10. Shutdown voltage vs temperature
2.5 V
2 V
30 mA
Figure 11. Shutdown current vs shutdown voltage
Figure 12. Supply voltage rejection vs temperature
8/17 DocID8059 Rev 12
LK112S Typical characteristics
Figure 13. Supply voltage rejection vs output current
Figure 14. Supply voltage rejection vs frequency
Figure 15. Supply voltage rejection vs temperature
Figure 16. Shutdown current vs temperature
Figure 17. Quiescent current vs input voltage Figure 18. Quiescent current vs shutdown voltage
DocID8059 Rev 12 9/17
17
Typical characteristics LK112S
Figure 19. Quiescent current vs temperature Figure 20. Reverse current vs reverse voltage
Figure 21. Stability Figure 22. Noise spectrum
Figure 23. Start-up transient C
BYP
=10 nF Figure 24. Start-up transient C
BYP
=100 nF
V
I
=3.5V, V
C
O
O
=2.5V, V
=4.7µF, C
BYP
SHDN
= 0 to 1.8V, R
L
=2.5k
Ω
, C
I
=1µF,
=10nF
V
I
=3.5V, V
O
C
O
=2.5V, V
=4.7µF, C
BYP
SHDN
= 0 to 1.8V, R
=100nF
L
=68
Ω
, C
I
=1µF,
10/17 DocID8059 Rev 12
LK112S
Figure 25. Line transient Co=100 µF
Typical characteristics
Figure 26. Line transient Co=10 µF
V
I
=3.5 to 4.5V, V
C
O
=100µF, C
O
=2.5V, V
SHDN
= 1.8V, I
O
=30mA, no C
BYP
=10nF, t s
=t f
=2µs
I
,
Figure 27. Line transient Co=1 µF
V
I
=3.5 to 4.5V, V
O
C
O
=2.5V, V
SHDN
=10µF, C
BYP
=10nF, t s
=t f
= 1.8V, I
=2µs
O
=30mA, no C
I
,
Figure 28. Load transient Vo=2.5 V, Co=2.2 µF
V
I
=3.5 to 4.5V, V
C
O
O
=1µF, C
BYP
=2.5V, V
SHDN
=1nF, t s
=t f
= 1.8V, I
O
=30mA, no C
=2µs
I
, V
I
=3.5V, V
O
C
O
=2.5V, V
=2.2µF, C
BYP
SHDN
= 1.8V, I
=10nF, t s
=t f
O
=50 to 100mA, C
=250ns
I
=1µF,
Figure 29. Load transient Vo=2.5 V, Co=10 µF Figure 30. Load transient Vo=3.8 V,Co=2.2 µF
V
I
=3.5V, V
C
O
O
=2.5V, V
=10µF, C
BYP
SHDN
= 1.8V, I
O
=50 to 100mA, C
I
=1µF,
=100nF, t s
=t f
=250ns
V
I
=4.8V, V
O
C
O
=3.8V, V
=2.2µF, C
BYP
SHDN
= 1.8V, I
=10nF, t s
=t f
O
=50 to 100mA, C
=250ns
I
=1µF,
DocID8059 Rev 12 11/17
17
Package mechanical data
6 Package mechanical data
LK112S
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK
® specifications, grade definitions and product status are available at: www.st.com
.
ECOPACK
®
is an ST trademark.
Figure 31. SOT23-5L mechanical drawings
BN
12/17 DocID8059 Rev 12
LK112S Package mechanical data
Dim.
A
A1
A2 b c
D
E e
H
L
θ
Table 6. SOT23-5L mechanical data mm
Typ.
Min.
0.90
0
0.90
0.30
2.09
0.30
0
2.95
1.60
0.95
2.80
Max.
1.45
0.15
1.30
0.50
0.20
0.60
8
Figure 32. SOT23-5L recommended footprint (dimensions in mm)
DocID8059 Rev 12
BN
13/17
17
Packaging mechanical data
7 Packaging mechanical data
Figure 33.SOT23-5L tape and reel drawings
LK112S
14/17 DocID8059 Rev 12
LK112S Packaging mechanical data
Dim.
A
C
D
N
T
Ao
Bo
Ko
Po
P
Figure 34.SOT23-5L tape and reel mechanical data mm
Min.
Typ.
13.0
Max.
180
13.2
12.8
20.2
60
3.13
3.07
1.27
3.9
3.9
3.23
3.17
1.37
4.0
4.0
14.4
3.33
3.27
1.47
4.1
4.1
DocID8059 Rev 12 15/17
17
Revision history
8 Revision history
Date
31-Aug-2004
31-Jan-2005
12-Jun-2006
17-Oct-2006
20-Jul-2007
21-Sep-2007
11-Dec-2007
12-Feb-2008
10-Jul-2008
11-Feb-2014
LK112S
Revision
7
8
9
5
6
3
4
10
11
12
Table 7. Document revision history
Changes
Mistake on fig. 19.
Change maturity code.
Order codes updated.
The T
OP
value on table 2 updated.
Add
Features updated.
Modified:
.
Modified:
.
Modified:
and
.
Part number LK112Sxx changed to LK112S.
Updated the title and the
in cover page, Table 2: Pin description ,
Section 5: Typical characteristics
and Section 6: Package mechanical data
.
Added
Section 7: Packaging mechanical data
.
Minor text changes.
16/17 DocID8059 Rev 12
LK112S
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