STMicroelectronics LK112 Datasheet
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LK112
Low noise and low drop voltage regulator with shutdown function
Datasheet
-
production data
•
Internal current and thermal limit
•
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)
Description
Features
SOT23-5L
• Output current up to 150 mA
• Low-dropout voltage (350 mV at I
OUT
= 150 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
80 kHz
= 60 mA and 10 Hz < f <
• Wide range of output voltages
The LK112 is a low-dropout linear regulator with a built-in electronic switch. The internal switch can be controlled by TTL or CMOS logic levels. The device is on-state when the control pin is pulled to a logic high 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. The LK112 has a very low quiescent current in on mode while in off mode I q
is reduced below 100 nA max. The internal thermal shutdown circuitry limits the junction temperature below 150 °C. Load current is internally monitored and the device shuts down in the presence of a short-circuit or overcurrent condition on the output.
Table 1. Device summary
Order codes Output voltages
LK112M15TR
LK112M18TR
LK112M25TR
LK112M33TR
LK112M50TR
LK112M55TR
LK112M60TR
LK112M80TR
1.5V
1.8V
2.5V
3.3V
5.0V
5.5V
6.0V
8.0V
April 2014
This is information on a product in full production.
DocID7362 Rev 17 1/18 www.st.com
Contents
Contents
LK112
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/18 DocID7362 Rev 17
LK112
1 Diagram
Figure 1. Schematic diagram
Diagram
DocID7362 Rev 17 3/18
18
Pin configuration
Figure 2. Pin connection (top view)
LK112
Pin n°
1
2
3
4
5
Symbol
SHDN
GND
Bypass
OUT
IN
Table 2. Pin description
Note
Shutdown input disables the regulator when it is connected to GND or to positive voltage less 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 pin with 0.1 µF to improve the noise performance
Output port
Input port
4/18 DocID7362 Rev 17
LK112 Maximum ratings
Symbol
V
I
V
SHDN
I
O
T
STG
T
OP
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
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
Unit
V
V
°C
°C
DocID7362 Rev 17 5/18
18
Electrical characteristics LK112
T
J
= 25 °C, V
IN
= V
OUT
+ 1 V, I
OUT
= 0 mA, V
SHDN
C
BYPASS
= 0.1 µF unless otherwise specified.
= 1.8 V, C
I
= 1 µF, C
O
= 2.2 µF,
Symbol Parameter
Table 5. LK112 electrical characteristics
Test conditions
Δ
Δ
I
V
V
V
V q
O d
O
O
Quiescent current
Output voltage
Line regulation
Load regulation
Dropout voltage
On mode (except I
SHDN
)
Off mode, V
I
= 8V, V
SHDN
= 0V
I
O
= 30mA
V
I
= V
O
+1V to V
O
+6V, V
O
≤ 5.6V
V
I
= V
O
+1V to V
O
+6V, V
O
>
5.6V
I
O
= 1 to 60mA
I
O
= 1 to 150mA
I
O
= 60mA
(1)
I
O
= 150mA
(1)
I
O
Output current limit
I
V
SVR eN
SHDN
SHDN
Supply voltage rejection
Output noise voltage
Shutdown input current
Shutdown input logic
V
I
= V
O
+1.5V, C
BYP
= 0.1µF
C
O
= 10µF, f = 400Hz, I
O
= 30mA
B= 10Hz to 80kHz, C
BYP
= 0.1µF
C
O
= 10µF, V
I
= V
O
+1.5V, I
O
= 60mA
V
SHDN
= 1.8V, output on
Output on
Output off
Δ V
O
/T
J
Output voltage temperature coefficient
I
O
= 10mA
1.
For versions with output voltage more than 2.1 V only.
Min.
Typ.
Max.
Unit
-2
150
1.8
175
0
0.7
0.8
15
25
0.17
0.29
55
30
12
0.09
250
0.1
+2
20
40
30
90
0.24
0.35
35
0.6
dB
µVrms
µA
V mV/°C
µA
µA
% mV mV mV mV
V
V mA
Note: For version with output voltage less than 2 V, V
IN
= 2.4 V.
6/18 DocID7362 Rev 17
LK112 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
O
= 2.5V) Figure 4. Output voltage vs. temperature
(V
O
= 3.8V)
Figure 5. Line regulation vs. temperature Figure 6. Load regulation vs. temperature
DocID7362 Rev 17 7/18
18
Typical characteristics LK112
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 (V
O
= 2.5V)
8/18 DocID7362 Rev 17
LK112 Typical characteristics
Figure 13. Supply voltage rejection vs. output current
Figure 14. Supply voltage rejection vs. frequency
Figure 15. Supply voltage rejection vs. temperature (V
O
= 3.8V)
Figure 16. Quiescent current vs. temperature
Figure 17. Quiescent current vs. input voltage Figure 18. Quiescent current vs. shutdown voltage
DocID7362 Rev 17 9/18
18
Typical characteristics LK112
Figure 19. Quiescent current vs. output current 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,
10/18 DocID7362 Rev 17
LK112
Figure 25. Line transient (C o
= 100 µF)
Typical characteristics
Figure 26. Line transient (C o
= 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 (C o
= 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 (C o
= 2.2 µF,
C
BYP
= 10 nF)
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,
DocID7362 Rev 17 11/18
18
Typical characteristics
Figure 29. Load transient (C o
= 10 µF,
C
BYP
= 100 nF)
Figure 30. Load transient (V o
= 3.8 V)
LK112
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,
12/18 DocID7362 Rev 17
LK112
6
Package mechanical data
Package mechanical data
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
DocID7362 Rev 17 13/18
18
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)
LK112
BN
14/18 DocID7362 Rev 17
LK112
7
Packaging mechanical data
Packaging mechanical data
Figure 33.Tape and reel SOT23-5L mechanical drawings
DocID7362 Rev 17 15/18
18
Packaging mechanical data
A
C
D
N
T
Ao
Bo
Ko
Po
P
Dim.
Figure 34. Tape and reel SOT23-5L 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
LK112
16/18 DocID7362 Rev 17
LK112 Revision history
Date
31-Jan-2005
13-Jun-2006
17-Oct-2006
18-Jul-2007
21-Sep-2007
11-Dec-2007
12-Feb-2008
10-Jul-2008
28-Feb-2011
24-Apr-2014
Revision
10
11
12
13
14
15
16
8
9
17
Table 7. Document revision history
Changes
Change maturity code.
Order codes updated and new template.
The T
OP
value on table 2 has been updated.
in cover page.
Features updated.
Modified: Table 1 and Table 1 on page 1
.
Changed the part number LK112xx to LK112.
Updated the Title in cover page and Table 1: Device summary
.
Updated the features and description in cover page,
Figure 3: Output voltage vs. temperature (VO= 2.5V) ,
Figure 4: Output voltage vs. temperature (VO= 3.8V)
,
,
Section 6: Package mechanical data .
Added
Section 7: Packaging mechanical data .
Minor text changes.
DocID7362 Rev 17 17/18
18
LK112
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