STMicroelectronics LK112SXX21 Low noise low drop voltage regulator with shutdown function Datasheet

LK112Sxx
Low noise low drop voltage regulator with shutdown function
Features
■
Output current up to 200 mA
■
Low dropout voltage (500 mV max at
IOUT = 200 mA)
■
Very low quiescent current: 0.1 µA in OFF
mode and max 250 µA in ON mode at
IOUT = 0 mA
■
Low output noise: typ. 30 µV at IOUT = 60 mA
and 10 Hz < f < 80 kHz
■
Wide range of output voltages
■
Internal current and thermal limit
■
VOUT tolerance ± 2% (at 25 °C)
■
Operative input voltage from:
VOUT + 0.5 to 14 V (for VOUT > 2 V)
or from 2.5 V to 14 V (for VOUT < 2 V)
µVrms. An internal PNP pass transistor is used to
achieve a low dropout voltage.
Description
The LK112Sxx 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
Table 1.
SOT23-5L
The LK112Sxx has a very low quiescent current
in ON MODE while in OFF MODE the Iq is
reduced down to 100 nA max. The 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.
Device summary
Part numbers
LK112SXX13
LK112SXX24
LK112SXX36
LK112SXX45
LK112SXX14
LK112SXX26
LK112SXX37
LK112SXX46
LK112SXX18
LK112SXX28
LK112SXX38
LK112SXX47
LK112SXX19
LK112SXX29
LK112SXX39
LK112SXX48
LK112SXX20
LK112SXX31
LK112SXX41
LK112SXX49
LK112SXX21
LK112SXX33
LK112SXX42
LK112SXX50
LK112SXX22
LK112SXX34
LK112SXX43
LK112SXX23
LK112SXX35
LK112SXX44
July 2008
Rev 11
1/17
www.st.com
17
Contents
LK112Sxx
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
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
LK112Sxx
Diagram
1
Diagram
Figure 1.
Schematic diagram
3/17
Pin configuration
LK112Sxx
2
Pin configuration
Figure 2.
Pin connection (top view)
Table 2.
Pin description
4/17
Pin n°
Symbol
1
SHDN
2
GND
3
Bypass
4
OUT
5
IN
Note
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.
Bypass Pin: Bypass with 0.1 µF to improve the VREF thermal noise performances.
Output port
Input port
LK112Sxx
Maximum ratings
3
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
VI
DC input voltage
16
V
VSHDN
DC input voltage
16
V
IO
Output current
Internally limited
TSTG
Storage temperature range
-55 to 150
°C
TOP
Operating junction temperature range
-40 to 125
°C
Table 4.
Symbol
Thermal data
Parameter
SOT23-5L
Unit
RthJC
Thermal resistance junction-case
81
°C/W
RthJA
Thermal resistance junction-ambient
255
°C/W
5/17
Electrical characteristics
LK112Sxx
4
Electrical characteristics
Table 5.
Electrical characteristics for LK112S (TJ = 25 °C, VIN=VOUT+1 V (1), IOUT = 0mA,
VSHDN = 1.8 V, CI = 1 µF, CO = 2.2 µF, CBYPASS = 0.1 µF unless otherwise specified)
Symbol
Parameter
Id
Quiescent current
VO
Output voltage
ΔVO
Line regulation
ΔVO
Load regulation
Test conditions
Min.
ON MODE (except ISHDN)
OFF MODE, VI = 8V, VSHDN = 0V
Vd
Dropout voltage
ISC
Short circuit current
IO = 30mA
Typ.
Max.
Unit
175
250
µA
0
0.1
µA
(see table)
VI = VO+1V to VO+6V, VO ≤ 5.6V
0.7
20
mV
VI = VO+1V to VO+6V, VO > 5.6V
0.8
40
mV
IO = 1 to 60mA
15
30
mV
IO = 1 to 200mA
30
90
mV
0.17
0.24
V
0.35
0.5
V
IO = 60 mA
(2)
IO = 200 mA (2)
200
mA
Supply voltage rejection
VI = VO+1.5V, CBYP = 0.1µF
CO = 10µF, f = 400Hz, IO = 30mA
55
dB
Output noise voltage
B= 10Hz to 80kHz, CBYP = 0.1µF
CO = 10µF, VI = VO+1.5V, IO = 60mA
30
µVrms
ISHDN
Shutdown input current
VSHDN = 1.8V, Output ON
12
VSHDN
Shutdown input logic
ΔVO/TJ
Output voltage
temperature coefficient
SVR
eN
Output ON
µA
1.8
V
Output OFF
IO = 10mA
1. For version with output voltage less than 2V VIN=2.4V
2. Only for version with output voltage more than 2.1V
6/17
35
0.6
0.09
mV/°C
LK112Sxx
Typical characteristics
5
Typical characteristics
Figure 3.
(Unless otherwise specified, TJ = 25 °C, CI = 1 µF, CO = 2.2 µF, CBYP = 100 nF)
Output voltage vs temperature
Figure 4.
Output voltage vs temperature
Figure 5.
Line regulation vs temperature
Figure 6.
Load regulation vs temperature
Figure 7.
Dropout voltage vs temperature
Figure 8.
Short circuit current vs dropout
voltage
7/17
Typical characteristics
Figure 9.
Output voltage vs input voltage
LK112Sxx
Figure 10. Shutdown voltage vs temperature
Figure 11. Shutdown current vs shutdown
voltage
Figure 12. Supply voltage rejection vs
temperature
Figure 13. Supply voltage rejection vs output
current
Figure 14. Supply voltage rejection vs
frequency
8/17
LK112Sxx
Figure 15. Supply voltage rejection vs
temperature
Typical characteristics
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 temperature
Figure 20. Reverse current vs reverse voltage
9/17
Typical characteristics
LK112Sxx
Figure 21. Stability
Figure 22. Spectrum noise
Figure 23. Start-up transient
Figure 24. Start-up transient
VI=3.5V, VO=2.5V, VSHDN= 0 to 1.8V, RL=2.5kΩ, CI=1µF,
CO=4.7µF, CBYP=10nF
VI=3.5V, VO=2.5V, VSHDN= 0 to 1.8V, RL=68Ω, CI=1µF,
CO=4.7µF, CBYP=100nF
Figure 25. Line transient
Figure 26. Line transient
VI=3.5 to 4.5V, VO=2.5V, VSHDN= 1.8V, IO=30mA, no CI,
CO=100µF, CBYP=10nF, ts=tf=2µs
VI=3.5 to 4.5V, VO=2.5V, VSHDN= 1.8V, IO=30mA, no CI,
CO=10µF, CBYP=10nF, ts=tf=2µs
10/17
LK112Sxx
Typical characteristics
Figure 27. Line transient
Figure 28. Load transient
VI=3.5 to 4.5V, VO=2.5V, VSHDN= 1.8V, IO=30mA, no CI,
CO=1µF, CBYP=1nF, ts=tf=2µs
VI=3.5V, VO=2.5V, VSHDN= 1.8V, IO=50 to 100mA, CI=1µF,
CO=2.2µF, CBYP=10nF, ts=tf=250ns
Figure 29. Load transient
Figure 30. Load transient
VI=3.5V, VO=2.5V, VSHDN= 1.8V, IO=50 to 100mA, CI=1µF,
CO=10µF, CBYP=100nF, ts=tf=250ns
VI=4.8V, VO=3.8V, VSHDN= 1.8V, IO=50 to 100mA, CI=1µF,
CO=2.2µF, CBYP=10nF, ts=tf=250ns
11/17
Package mechanical data
6
LK112Sxx
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
12/17
LK112Sxx
Package mechanical data
SOT23-5L mechanical data
mm.
mils.
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
0.90
1.45
35.4
57.1
A1
0.00
0.10
0.0
3.9
A2
0.90
1.30
35.4
51.2
b
0.35
0.50
13.7
19.7
C
0.09
0.20
3.5
7.8
D
2.80
3.00
110.2
118.1
E
1.50
1.75
59.0
68.8
e
0.95
37.4
H
2.60
3.00
102.3
118.1
L
0.10
0.60
3.9
23.6
7049676D
13/17
Package mechanical data
LK112Sxx
Tape & reel SOT23-xL mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Min.
Typ.
180
13.0
13.2
Max.
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
14/17
Max.
0.504
0.512
14.4
0.519
0.567
Ao
3.13
3.23
3.33
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
LK112Sxx
Order codes
7
Order codes
Table 6.
Order codes
Part number
Output voltage
VOUT Min.
VOUT Max.
Test voltage
LK112SM13TR (1)
1.3V
1.24V
1.36V
2.4V
(1)
1.4V
1.34V
1.46V
2.4V
LK112SM14TR
LK112SM18TR
1.8V
1.74V
1.86V
2.4V
LK112SM19TR
(1)
1.9V
1.84V
1.96V
2.4V
LK112SM20TR
(1)
2.0V
1.94V
2.06V
3.0V
LK112SM21TR
(1)
2.1V
2.04V
2.16V
3.1V
LK112SM22TR (1)
2.2V
2.14V
2.26V
3.2V
LK112SM23TR
(1)
2.3V
2.24V
2.36V
3.3V
LK112SM24TR
(1)
2.4V
2.34V
2.46V
3.4V
LK112SM26TR
(1)
2.6V
2.54V
2.66V
3.6V
LK112SM28TR
2.8V
2.74V
2.86V
3.8V
LK112SM29TR
(1)
2.9V
2.84V
2.96V
3.9V
LK112SM31TR
(1)
3.1V
3.04V
3.16V
4.1V
LK112SM33TR
3.3V
3.24V
3.36V
4.3V
LK112SM34TR (1)
3.4V
3.335V
3.465V
4.4V
LK112SM35TR
(1)
3.5V
3.435V
3.565V
4.5V
LK112SM36TR
(1)
3.6V
3.535V
3.655V
4.6V
LK112SM37TR
(1)
3.7V
3.630V
3.770V
4.7V
LK112SM38TR (1)
3.8V
3.725V
3.875V
4.8V
LK112SM39TR
(1)
3.9V
3.825V
3.975V
4.9V
LK112SM41TR
(1)
4.1V
4.020V
4.180V
5.1V
LK112SM42TR
(1)
4.2V
4.120V
4.280V
5.2V
LK112SM43TR (1)
4.3V
4.215V
4.385V
5.3V
LK112SM44TR
(1)
4.4V
4.315V
4.485V
5.4V
LK112SM45TR
(1)
4.5V
4.410V
4.590V
5.5V
LK112SM46TR
(1)
4.6V
4.510V
4.690V
5.6V
LK112SM47TR (1)
4.7V
4.605V
4.795V
5.7V
LK112SM48TR
(1)
4.8V
4.705V
4.895V
5.8V
LK112SM49TR
(1)
4.9V
4.800V
5.000V
5.9V
5.0V
4.900V
5.100V
6.0V
LK112SM50TR
1. Available on request.
15/17
Revision history
LK112Sxx
8
Revision history
Table 7.
Document revision history
Date
Revision
31-Aug-2004
3
Mistake on fig. 19.
31-Jan-2005
4
Change maturity code.
12-Jun-2006
5
Order codes updated.
17-Oct-2006
6
The TOP value on table 2 updated.
20-Jul-2007
7
Add Table 1 in cover page.
21-Sep-2007
8
Features updated.
11-Dec-2007
9
Modified: Table 6.
12-Feb-2008
10
Modified: Table 6 on page 15.
10-Jul-2008
11
Modified: Table 1 on page 1 and Table 6 on page 15.
16/17
Changes
LK112Sxx
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