LDK120
200 mA low quiescent current very low noise LDO
Datasheet - production data
Applications
Mobile phones
Personal digital assistants (PDAs)
627/
')1[PP
Cordless phones and similar battery-powered
systems
Digital still cameras
Description
The LDK120 low drop voltage regulator provides
200 mA of maximum current from an input supply
voltage in the range of 1.9 V to 5.5 V, with a
typical dropout voltage of 100 mV.
627/
It is stabilized with a ceramic capacitor on the
output.
Features
Input voltage from 1.9 to 5.5 V
Very low dropout voltage (100 mV typ. at 100
mA load)
Low quiescent current (max. 100 µA, 1 µA in
OFF mode)
Very low noise
Output voltage tolerance: ± 2.0% @ 25 °C
The very low drop voltage, low quiescent current
and low noise features make it suitable for low
power battery-powered applications.
An enable logic control function puts the LDK120
in shutdown mode allowing a total current
consumption lower than 1 µA.
The device also includes a short-circuit constant
current limiting and thermal protection.
200 mA guaranteed output current
Wide range of fixed output voltages available
on request: from 0.8 V to 3.5 V with 100 mV
step
Adjustable version: from 0.8 V to VIN-Vdrop
Logic-controlled electronic shutdown
Compatible with ceramic capacitor COUT = 1 µF
Internal current and thermal limit
Available in SOT23-5L, SOT323-5L and DFN6
(1.2 x 1.3 mm) packages
Temperature range: -40 °C to 125 °C
January 2018
This is information on a product in full production.
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www.st.com
24
Contents
LDK120
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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LDK120
1
Diagram
Diagram
Figure 1. Block diagram
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Pin configuration
2
LDK120
Pin configuration
Figure 2. Pin connection (top view)
#:1"%+/$
SOT23-5L, SOT323-5L
DFN6 (1.2 x 1.3)
Table 1. Pin description (SOT23-5L, SOT323-5L)
Pin
Function
Symbol
SOT23/
SOT323
DFN6
1
6
IN
Input voltage of the LDO
2
2
GND
Common ground
3
4
EN
Enable pin logic input: Low = shutdown, High = active
Fixed
BYP(1)/ADJ
Adjustable
D version
4
3
5
1
OUT
Output voltage of the LDO
-
5
N/C
Not connected. This pin should be connected to GND
/NC
Bypass capacitor
Adjustable pin
Internally not connected
1. Bypass capacitor for noise reduction on fixed version is optional, if not used the relevant pin must be left
floating with no routing on the board.
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3
Typical application
Typical application
Figure 3. Typical application circuits for fixed version
287
,1
9,
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Typical performance characteristics
LDK120
Figure 24. Output noise vs. frequency
(VO = VADJ)
Figure 25. Stability region vs. COUT (fixed)
9,1 9 9287 9$'- &,1 &287 )
AM16215v1
10
9
$
P$
P$
8
ESR @ 100 kHz [Ω]
2XWSXW1RLVH'HQVLW\> 9VTUW+]@
7
6
Stability area
5
4
3
2
1
0
0
Ϭ͘Ϭϭ
Ϭ͘ϭ
ϭ
ϭϬ
ϭϬϬ
1
2
ϭϬϬϬ
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
COUT [µF] (nominal value)
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VIN = VEN = 4 to 5.5 V, IOUT = 10 mA to 0.2 A, CIN = 1 µF,
TA = 25 °C
Figure 26. Stability region vs COUT (adjust.)
Figure 27. Line transient (VOUT = VADJ)
AM16216v1
10
9
8
ESR @ 100 kHz [Ω]
7
6
Stability area
5
4
3
2
1
0
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
COUT [µF] (nominal value)
VIN = VEN = 1.9 to 5.5 V, IOUT = 10 mA to 0.2 A, CIN = 1 µF,
TA = 25 °C
Figure 28. Line transient (VOUT = 3 V)
VOUT = 3 V, VIN = 4 V to 4.5 V, VEN = 2 V, IOUT = 1 mA, NO
CIN, COUT = 1 µF, tr = tf = 5 µs
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VOUT = VADJ, VIN = 3.5 V to 4 V, VEN = 2 V, IOUT = 1 mA, NO
CIN, COUT = 1 µF, tr = tf = 5 µs
Figure 29. Load transient (VOUT = 3 V)
VOUT = 3 V, VIN = VEN = 3.5 V, IOUT = 1 mA to 200 mA, COUT
= 1 µF, tr = tf = 5 µs
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LDK120
Typical performance characteristics
Figure 30. Load transient (VOUT = VADJ)
Figure 31. Startup transient
VOUT = VADJ, VIN = VEN = 3.5 V, IOUT = 1 mA to 200 mA,
COUT = 1 µF, tr = tf = 5 µs
VOUT = 3 V, VIN = VEN = 0 to 4.2 V, IOUT = 1 mA, CIN = COUT
= 1 µF, tr = tf = 5 µs
Figure 32. Enable transient (VOUT = VADJ)
Figure 33. Enable transient (VOUT = 3 V)
VIN = 4 V, VEN = 0 to VIN, IOUT = 200 mA, CIN = COUT = 1 µF,
tr = tf = 1 µs
VOUT @ 0.8 V, VIN = 1.9, VEN = 0 to VIN, IOUT = 200 mA,
COUT = 1 µF, tr = tf = 1 µs
Figure 34. Dropout voltage vs. temperature
(IOUT = 100 mA)
Figure 35. Dropout voltage vs. temperature
(IOUT = 200 mA)
AM16226v1
300
C IN = COUT = 1 µF, IOUT = 200 mA, Fixed 3.0 V version
250
Dropout Voltage [mV]
Dropout Voltage [mV]
250
200
150
100
50
0
-50
AM16227v1
300
C IN = COUT = 1 µF, IOUT = 100 mA, Fixed 3.0 V version
-25
0
25
50
75
100
125
150
200
150
100
50
0
-50
-25
0
25
50
75
100
125
150
Temperature [°C]
Temperature [ °C]
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Package mechanical data
7
LDK120
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 36. SOT23-5L mechanical drawing
BN
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LDK120
Package mechanical data
Table 6. SOT23-5L mechanical data
mm
Dim.
Min.
Typ.
Max.
A
0.90
1.45
A1
0
0.15
A2
0.90
1.30
b
0.30
0.50
c
0.09
0.20
D
2.95
E
1.60
e
0.95
H
2.80
L
0.30
0.60
0
8
Figure 37. SOT23-5L footprint (dimensions in mm)
BN
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Package mechanical data
LDK120
Figure 38. DFN6L (1.2 x 1.3 mm) drawing
B$
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Package mechanical data
Table 7. DFN6L (1.2 x 1.3 mm) mechanical data
mm
Dim.
Min.
Typ.
Max.
A
0.41
0.45
0.50
A1
0.00
0.02
0.05
D
-
1.20
-
E
-
1.30
-
e
-
0.40
-
b
0.15
0.18
0.25
L
0.475
0.525
0.575
L3
0.375
0.425
0.475
aaa
-
0.05
-
Figure 39. DFN6L footprint (dimensions in mm)
B$
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Package mechanical data
LDK120
Figure 40. SOT323-5L drawing
BI
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LDK120
Package mechanical data
Table 8. SOT323-5L mechanical data
mm
Dim.
Min.
Typ.
Max.
A
0.80
1.10
A1
0
0.10
A2
0.80
b
0.15
0.30
c
0.10
0.22
D
1.80
2
2.20
E
1.80
2.10
2.40
E1
1.15
1.25
1.35
0.90
e
0.65
e1
1.30
L
0.26
0
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0.36
1
0.46
8
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Packaging mechanical data
8
LDK120
Packaging mechanical data
Figure 41. SOT23-5L and SOT323-xL tape and reel drawing
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LDK120
Packaging mechanical data
Table 9. SOT23-5L tape and reel mechanical data
mm
Dim.
Min.
Typ.
A
Max.
180
C
12.8
D
20.2
N
60
13.0
T
13.2
14.4
Ao
3.13
3.23
3.33
Bo
3.07
3.17
3.27
Ko
1.27
1.37
1.47
Po
3.9
4.0
4.1
P
3.9
4.0
4.1
Table 10. SOT323-xL tape and reel mechanical data
mm
Dim.
Min.
Typ.
Max.
A
175
180
185
C
12.8
13
13.2
D
20.2
N
59.5
60
60.5
T
14.4
Ao
2.25
Bo
3.17
Ko
1.2
Po
3.9
4.0
4.1
P
3.9
4.0
4.2
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Order codes
9
LDK120
Order codes
Table 11. Order codes
Package
Output
voltage
SOT323-5L
SOT23-5L
DFN6L
LDK120C-R
LDK120M-R
LDK120PU-R
ADJ
LDK120C08R
LDK120M08R
LDK120PU08R
0.8 V
LDK120C10R
LDK120M10R
LDK120PU10R
1.0 V
LDK120C11R
LDK120M11R
LDK120C12R
LDK120M12R
LDK120C15R
LDK120M15R
LDK120C18R
LDK120M18R
LDK120PU18R
1.8 V
LDK120C25R
LDK120M25R
LDK120PU25R
2.5 V
LDK120C28R
LDK120M28R
LDK120C29R
LDK120M29R
LDK120PU29R
2.9 V
LDK120C30R
LDK120M30R
LDK120PU30R
3.0 V
LDK120C31R
LDK120M31R
LDK120C32R
LDK120M32R
1.1 V
LDK120PU12R
1.5 V
2.8 V
3.1 V
LDK120PU32R
LDK120DM33R
LDK120C33R
LDK120M33R
1.2 V
3.2 V
3.3 V
LDK120PU33R
LDK120C35R
3.3 V
3.5 V
Table 12. Marking
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Order codes
Package
Output voltage
Marking
LDK120DMxxR
SOT23-5L
xx V
Dxx
LDK120MxxR
SOT23-5L
xx V
Kxx
LDK120CxxR
SOT323-5L
xx V
Kxx
LDK120PUxxR
DFN-6L
xx V
xx
LDK120M-R
SOT23-5L
Adj
KAD
LDK120C-R
SOT323-5L
Adj
KAD
LDK120PU-R
DFN-6L
Adj
AD
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LDK120
10
Revision history
Revision history
Table 13. Document revision history
Date
Revision
Changes
26-Nov-2012
1
Initial release
31-Jan-2013
2
Added new part number LDK120PU32R
Updated Table 11: Order codes
18-Oct-2013
3
RPN LDK120xx changed to LDK120.
Updated the Features and the Description in cover page.
Cancelled Table1: Device summary.
Updated Section 7: Package mechanical data, Table 2: Absolute
maximum ratings and Table 11: Order codes.
Added Section 8: Packaging mechanical data..
Minor text changes.
10-Mar-2014
4
Updated Table 11: Order codes.
29-Apr-2014
5
Updated Table 1: Pin description (SOT23-5L, SOT323-5L), Table 4:
Electrical characteristics for LDK120 (fixed version), Table 5:
Electrical characteristics for LDK120 (adjustable version), Table 11:
Order codes and Table 12: Marking.
Added Figure 4: Typical application circuits for D version.
Minor text changes.
29-Aug-2014
6
Updated Table 6: SOT23-5L mechanical data and Table 11: Order
codes.
07-Oct-2014
7
Updated Table 11: Order codes.
Minor text changes.
19-Jan-2018
8
Updated: Figure 23: Output noise vs. frequency (VO = 2.5 V) and
Figure 24: Output noise vs. frequency (VO = VADJ).
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LDK120
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