Low noise low drop voltage regulator with shutdown function
Features
■ Output current up to 150 mA
■ Low dropout voltage (350 mV at I
■ Very low quiescent current:
– 0.1 µA in OFF mode and max. 250 µA in
ON mode at I
■ Low output noise:
– typ. 30 µV at I
= 0 mA
OUT
= 60 mA and 10 Hz < f <
OUT
80 kHz
■ Wide range of output voltages
■ Internal current and thermal limit
■ Operative input voltage from:
–V
+ 0.5 to 14 V (for V
OUT
2.5 V to 14 V (for V
OUT
< 2 V)
OUT
> 2 V) or from
OUT
LK112xx
= 50 mA)
SOT23-5L
Description
The LK112xx 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
used connected to the noise bypass pin to lower
the output noise level to 30 µVrms. An internal
PNP pass transistor is used to achieve a low
dropout voltage. The LK112xx has a very low
quiescent current in ON MODE while in OFF
MODE the I
internal thermal shutdown circuitry limits the
junction temperature to below 150 °C. The load
current is internally monitored and the device will
shutdown in the presence of a short circuit or
overcurrent condition at the output.
Table 1. Device summary
is reduced down to 100 nA max. The
q
Part numbers
LK112XX15 LK112XX25 LK112XX50 LK112XX60
LK112XX18 LK112XX33 LK112XX55 LK112XX80
February 2011 Doc ID 7362 Rev 16 1/17
www.st.com
17
Contents LK112xx
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17 Doc ID 7362 Rev 16
LK112xx Diagram
1 Diagram
Figure 1. Schematic diagram
Doc ID 7362 Rev 16 3/17
Pin configuration LK112xx
2 Pin configuration
Figure 2. Pin connection (top view)
Table 2. Pin description
Pin n° Symbol Note
1 SHDN
2GND
3 Bypass Bypass pin: bypass with 0.1 µF to improve the V
4 OUT Output port
5 IN Input port
Shutdown input: disables the regulator when 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.
thermal noise performances.
REF
4/17 Doc ID 7362 Rev 16
LK112xx Maximum ratings
3 Maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
V
T
V
I
SHDN
I
O
STG
T
OP
DC input voltage 16 V
DC input voltage 16 V
Output current Internally limited
Storage temperature range -55 to 150 °C
Operating junction temperature range -40 to 125 °C
Table 4. Thermal data
Symbol Parameter SOT23-5L Unit
R
thJC
R
thJA
Thermal resistance junction-case 81 °C/W
Thermal resistance junction-ambient 255 °C/W
Doc ID 7362 Rev 16 5/17
Electrical characteristics LK112xx
4 Electrical characteristics
TJ = 25 °C, V
IN
= V
OUT
+ 1 V, I
OUT
= 0 mA, V
= 1.8 V, CI = 1 µF, CO = 2.2 µF, C
SHDN
BYPASS
0.1 µF unless otherwise specified.
Table 5. Electrical characteristics for LK112
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
q
V
O
ΔV
O
ΔV
O
V
d
I
O
SVR Supply voltage rejection
eN Output noise voltage
I
SHDN
V
SHDN
ΔV
O/TJ
Quiescent current
ON MODE (except I
OFF MODE, V
= 8V, V
I
)175250µA
SHDN
= 0V 0 0.1 µA
SHDN
Output voltage IO = 30mA (see table)
V
= VO+1V to VO+6V, VO ≤ 5.6V 0.7 20 mV
Line regulation
I
= VO+1V to VO+6V, VO > 5.6V 0.8 40 mV
V
I
IO = 1 to 60mA 15 30 mV
Load regulation
= 1 to 150mA 25 90 mV
I
O
(1)
(1)
0.17 0.24 V
0.29 0.35 V
Dropout voltage
IO = 60 mA
= 150 mA
I
O
Output current limit 150 mA
V
Shutdown input current V
= VO+1.5V, C
I
CO = 10µF, f = 400Hz, IO = 30mA
B= 10Hz to 80kHz, C
= 10µF, VI = VO+1.5V, IO = 60mA
C
O
= 1.8V, Output ON 12 35 µA
SHDN
BYP
= 0.1µF
= 0.1µF
BYP
55 dB
30 µVrms
Output ON 1.8
Shutdown input logic
Output OFF 0.6
Output voltage
temperature coefficient
I
= 10mA 0.09 mV/°C
O
=
V
1. Only for version with output voltage more than 2.1 V
Note: For version with output voltage less than 2 V, V
6/17 Doc ID 7362 Rev 16
= 2.4 V.
IN
LK112xx Typical characteristics
5 Typical characteristics
Unless otherwise specified, TJ = 25 °C, CI = 1 µF, CO = 2.2 µF, C
Figure 3. Output voltage vs. temperature Figure 4. Output voltage vs. temperature
Figure 5. Line regulation vs. temperature Figure 6. Load regulation vs. temperature
= 100 nF.
BYP
Figure 7. Dropout voltage vs. temperature Figure 8. Short circuit current vs. dropout
Doc ID 7362 Rev 16 7/17
voltage
Typical characteristics LK112xx
Figure 9. Output voltage vs. input voltage Figure 10. Shutdown voltage vs. temperature
Figure 11. Shutdown current vs. shutdown
voltage
Figure 13. Supply voltage rejection vs. output
current
Figure 12. Supply voltage rejection vs.
temperature
Figure 14. Supply voltage rejection vs.
frequency
8/17 Doc ID 7362 Rev 16
LK112xx Typical characteristics
Figure 15. Supply voltage rejection vs.
temperature
Figure 16. Quiescent current vs. temperature
Figure 17. Quiescent current vs. input voltage Figure 18. Quiescent current vs. shutdown
voltage
Figure 19. Quiescent current vs. output
current
Doc ID 7362 Rev 16 9/17
Figure 20. Reverse current vs. reverse voltage
Typical characteristics LK112xx
Figure 21. Stability Figure 22. Spectrum noise
Figure 23. Start-up transient Figure 24. Start-up transient
VI=3.5V, VO=2.5V, V
CO=4.7µF, C
Figure 25. Line transient Figure 26. Line transient
VI=3.5 to 4.5V, VO=2.5V, V
C
=100µF, C
O
BYP
= 0 to 1.8V, RL=2.5kΩ, CI=1µF,
SHDN
=10nF
= 1.8V, IO=30mA, no CI,
SHDN
=10nF, ts=tf=2µs
BYP
VI=3.5V, VO=2.5V, V
CO=4.7µF, C
VI=3.5 to 4.5V, VO=2.5V, V
C
=10µF, C
O
SHDN
=100nF
BYP
=10nF, ts=tf=2µs
BYP
= 0 to 1.8V, RL=68Ω, CI=1µF,
SHDN
10/17 Doc ID 7362 Rev 16
= 1.8V, IO=30mA, no CI,
LK112xx Typical characteristics
Figure 27. Line transient Figure 28. Load transient
VI=3.5 to 4.5V, VO=2.5V, V
=1µF, C
C
O
Figure 29. Load transient Figure 30. Load transient
VI=3.5V, VO=2.5V, V
C
=10µF, C
O
=1nF, ts=tf=2µs
BYP
SHDN
=100nF, ts=tf=250ns
BYP
= 1.8V, IO=30mA, no CI,
SHDN
= 1.8V, IO=50 to 100mA, CI=1µF,
VI=3.5V, VO=2.5V, V
=2.2µF, C
C
O
BYP
VI=4.8V, VO=3.8V, V
C
=2.2µF, C
O
BYP
= 1.8V, IO=50 to 100mA, CI=1µF,
SHDN
=10nF, ts=tf=250ns
= 1.8V, IO=50 to 100mA, CI=1µF,
SHDN
=10nF, ts=tf=250ns
Doc ID 7362 Rev 16 11/17
Package mechanical data LK112xx
6 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
12/17 Doc ID 7362 Rev 16
LK112xx Package mechanical data
SOT23-5L mechanical data
mm. mils.
Dim.
Min. Typ. Max. Min. Typ. Max.
A0.90 1.45 35.4 57.1
A1 0.00 0.10 0.0 3.9
A2 0.901.30 35.4 51.2
b 0.35 0.50 13.7 19.7
C0.09 0.20 3.5 7.8
D2.80 3.00 110.2 118.1
E 1.50 1.75 59.0 68.8
e0.95 37.4
H 2.60 3.00 102.3 118.1
L 0.10 0.60 3.9 23.6
7049676D
Doc ID 7362 Rev 16 13/17
Package mechanical data LK112xx
Tape & reel SOT23-xL mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
A180 7.086
C 12.8 13.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 3.133.233.33 0.123 0.127 0.131
Bo 3.07 3.17 3.27 0.120 0.124 0.128
Ko 1.27 1.37 1.47 0.050 0.054 0.0.58
Po 3.9 4.0 4.1 0.153 0.157 0.161
P 3.9 4.0 4.1 0.153 0.157 0.161
mm. inch.
14/17 Doc ID 7362 Rev 16
LK112xx Order codes
7 Order codes
Table 6. Order codes
Order codes Output voltages V
LK112M14TR
(1)
1.4V 1.34V 1.46V 2.4V
Min. V
OUT
Max Test voltage
OUT
LK112M15TR 1.5V 1.44V 1.56V 2.4V
LK112M18TR 1.8V 1.74V 1.86V 2.4V
LK112M19TR
LK112M20TR
LK112M22TR
LK112M23TR
LK112M24TR
(1)
(1)
(1)
(1)
(1)
1.9V 1.84V 1.96V 2.4V
2.0V 1.94V 2.06V 3.0V
2.2V 2.14V 2.26V 3.2V
2.3V 2.24V 2.36V 3.3V
2.4V 2.34V 2.46V 3.4V
LK112M25TR 2.5V 2.44V 2.56V 3.5V
LK112M26TR
LK112M29TR
LK112M31TR
(1)
(1)
(1)
2.6V 2.54V 2.66V 3.6V
2.9V 2.84V 2.96V 3.9V
3.1V 3.04V 3.16V 4.1V
LK112M33TR 3.3V 3.24V 3.36V 4.3V
LK112M34TR
LK112M35TR
LK112M37TR
LK112M39TR
LK112M41TR
LK112M42TR
LK112M43TR
LK112M44TR
LK112M45TR
LK112M46TR
LK112M48TR
LK112M49TR
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
3.4V 3.335V 3.465V 4.4V
3.5V 3.435V 3.565V 4.5V
3.7V 3.630V 3.770V 4.7V
3.9V 3.825V 3.975V 4.9V
4.1V 4.020V 4.180V 5.1V
4.2V 4.120V 4.280V 5.2V
4.3V 4.215V 4.385V 5.3V
4.4V 4.315V 4.485V 5.4V
4.5V 4.410V 4.590V 5.5V
4.6V 4.510V 4.690V 5.6V
4.8V 4.705V 4.895V 5.8V
4.9V 4.800V 5.000V 5.9V
LK112M50TR 5.0V 4.900V 5.100V 6.0V
LK112M55TR 5.5V 5.390V 5.610V 6.5V
LK112M60TR 6.0V 5.880V 6.120V 7.0V
LK112M80TR 8.0V 7.840V 8.160V 9.0V
1. Available on request.
Doc ID 7362 Rev 16 15/17
Revision history LK112xx
8 Revision history
Table 7. Document revision history
Date Revision Changes
31-Jan-2005 8 Change maturity code.
13-Jun-2006 9 Order codes updated and new template.
17-Oct-2006 10 The T
18-Jul-2007 11 Add Tab l e 1 in cover page.
21-Sep-2007 12 Features updated.
11-Dec-2007 13 Modified: Ta bl e 6 .
12-Feb-2008 14 Modified: Table 6 on page 15.
10-Jul-2008 15 Modified: Table 1 on page 1 and Table 6 on page 15.
28-Feb-2011 16 Modified: Table 6 on page 15.
value on table 2 has been updated.
OP
16/17 Doc ID 7362 Rev 16
LK112xx
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