DFN4 1x1
Features
• Input voltage from 1.5 to 5.5 V
• Ultra low dropout voltage (300 mV typ. at 300 mA load)
• Very low quiescent current (20 µA typ. at no load, 0.03 µA typ. in off mode)
• Output voltage tolerance: ± 0.5 % (A version) or ± 2.0 % @ 25 °C (standard
version)
• 300 mA guaranteed output current
• High PSRR (80 dB@1 kHz, 50 db@100 kHz)
• Wide range of output voltages available on request: from 0.8 V up to 5.0 V in 50
mV step
• Logic-controlled electronic shutdown
• Internal soft-start
• Optional output voltage discharge feature
• Compatible with ceramic capacitor COUT = 0.47 µF
• Internal constant current and thermal protections
• Available in DFN4 1x1
• Operating temperature range: -40 °C to 125 °C
Applications
• Mobile phones
• Tablets
• Digital still cameras (DSC)
• Cordless phones and similar battery-powered systems
• Portable media players
Description
The LD39030 high accuracy voltage regulator provides 300 mA of maximum current
from an input voltage ranging from 1.5 V to 5.5 V, with a typical dropout voltage of
300 mV.
It is available in DFN4 1 x 1 package, allowing the maximum space saving.
The device is stabilized with a ceramic capacitor on the output. The ultra low drop
voltage, low quiescent current and low noise features, together with the internal soft-
start circuit, make the LD39030 suitable for low power battery-operated applications.
An enable logic control function puts the LD39030 in shutdown mode allowing a total
current consumption lower than 0.1 µA. Constant current and thermal protection are
provided.
Maturity status link
LD39030
300 mA very low dropout linear regulator IC
LD39030
Datasheet
DS11386 - Rev 4 - May 2018
For further information contact your local STMicroelectronics sales office.
www.st.com
1Diagram
Figure 2. Block diagram
AM13852V1
VIN
GND
VOUT
OPAMP
Bias
generator
Bandgap
reference
EN
Thermal
protection
Enable
*
Note: The output discharge MOSFET is optional.
LD39030
Diagram
DS11386 - Rev 4 page 2/20
2Pin configuration
Figure 3. Pin connection (top view)
Table 1. Pin description
Pin n° DFN4 1x1 Symbol Function
1 OUT Output voltage
2 GND Common ground
3 EN Enable pin logic input: Low = shutdown, High = active
4 IN Input voltage
Thermal pad GND Connect to GND on the PCB
LD39030
Pin configuration
DS11386 - Rev 4 page 3/20
3Typical application
Figure 4. Typical application circuits
VIN
GND
VI
EN
CIn
VO
VOUT
COut
LD39030
OFF
ON
GIPD281020151007MT
LD39030
Typical application
DS11386 - Rev 4 page 4/20
4Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
VIN Input voltage - 0.3 to 7 V
VOUT Output voltage - 0.3 to VIN + 0.3 V
VEN Enable input voltage - 0.3 to 7 V
IOUT Output current Internally limited mA
PDPower dissipation Internally limited mW
TSTG Storage temperature range - 40 to 150 °C
TOP Operating junction temperature range - 40 to 125 °C
Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional
operation under these conditions is not implied. All values are referred to GND.
Table 3. Thermal data
Symbol Parameter Value Unit
RthJA Thermal resistance junction-ambient 250 °C/W
Table 4. ESD Performance
Symbol Parameter Test conditions Value Unit
ESD ESD Protection voltage
HBM 4 kV
MM 400 V
CDM 500 V
LD39030
Maximum ratings
DS11386 - Rev 4 page 5/20
5Electrical characteristics
TJ = 25 °C, VIN = VOUT(NOM) + 1 V , CIN = COUT = 1 µF, IOUT = 1 mA, VEN = VIN, unless otherwise specified.
Table 5. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
VIN Operating input
voltage 1.5 5.5 V
VOUT
VOUT accuracy
(LD39030)
IOUT = 1 mA, TJ = 25 °C -2 2 %
IOUT = 1 mA,
-40 °C < TJ < 125 °C -3 3 %
VOUT
VOUT accuracy
(LD39030A)
IOUT = 1 mA, TJ = 25 °C -0.5 0.5 %
IOUT = 1 mA,
-40 °C < TJ < 125 °C -1.5 1.5 %
∆VOUT Static line
regulation (1)
VOUT(NOM) + 1 V ≤ VIN ≤ 5.5
V, IOUT = 10 mA 0.02
%/V
-40 °C < TJ < 125 °C 0.2
∆VOUT Static load
regulation
IOUT = 0 mA to 300 mA 18 mV
-40 °C < TJ < 125 °C 0.01 %/mA
VDROP Dropout voltage
IOUT = 30 mA,VOUT = 2.8 V 35
mV
IOUT = 300 mA, VOUT = 2.8
V
-40 °C < TJ < 125 °C
330
eNOutput noise
voltage
10 Hz to 100 kHz, IOUT = 10
mA 45 µVRMS/V
SVR Supply voltage
rejection
VIN = VOUT(NOM)+ 1 V +/-
VRIPPLE
VRIPPLE = 0.2 V Freq .=1
kHz
IOUT = 30 mA
80
dB
VIN = VOUT(NOM)+ 1 V +/-
VRIPPLE
VRIPPLE = 0.2 V Freq. = 100
kHz
IOUT = 30 mA
55
IQQuiescent
current
IOUT = 0 mA 20 40
µA
IOUT = 300 mA 130
IStandby Standby Current VIN input current in OFF
MODE: VEN = GND 0.03 1 µA
ISC Short circuit
current RL = 0 480 mA
RON
Output voltage
discharge
MOSFET
(only on LD39030DT,
LD39030ADT) 100 Ω
LD39030
Electrical characteristics
DS11386 - Rev 4 page 6/20
Symbol Parameter Test conditions Min. Typ. Max. Unit
VEN
Enable input
logic low
VIN = 1.5 V to 5.5 V
-40 °C < TJ < 125 °C 0.4
V
Enable input
logic high
VIN = 1.5 V to 5.5 V
-40 °C < TJ < 125 °C 1
IEN Enable pin input
current VEN = VIN 100 nA
TON (2) Turn on time 100 µs
TSHDN
Thermal
shutdown 160
°C
Hysteresis 20
COUT Output
capacitor
Capacitance (see )Figure
18. Stability area vs. (COUT,
ESR)
0.47 22 µF
1. Not applicable for VOUT(NOM) > 4.5 V
2. Turn-on time is time measured between the enable input just exceeding VEN high value and the output voltage just reaching
95 % of its nominal value
LD39030
Electrical characteristics
DS11386 - Rev 4 page 7/20
6Application information
6.1 Soft start function
The LD39030 has an internal soft start circuit. By increasing the startup time up to 100µs, without the need of any
external soft start capacitor, this feature is able to keep the regulator inrush current at startup under control.
6.2 Output discharge function
The LD39030 integrates a MOSFET connected between Vout and GND. This transistor is activated when the EN
pin goes to low logic level and has the function to quickly discharge the output capacitor when the device is
disabled by the user.
The device is available with or without auto-discharge feature.
See Section 9 Ordering information for more details.
6.3 Input and output capacitors
The LD39030 requires external capacitors to assure the regulator control loop stability.
Any good quality ceramic capacitor can be used but, the X5R and the X7R are suggested since they guarantee a
very stable combination of capacitance and ESR overtemperature.
Locating the input/output capacitors as closer as possible to the relative pins is recommended.
The LD39030 requires an input capacitor with a minimum value of 1 μF.
This capacitor must be located as closer as possible to the input pin of the device and returned to a clean analog
ground.
The control loop of the LD39030 is designed to work with an output ceramic capacitor.
This capacitor must meet the requirements of minimum capacitance and equivalent series resistance (ESR), as
shown in Figure 18. Stability area vs. (COUT, ESR). To assure stability, the output capacitor must maintain its ESR
and capacitance in the stable region, over the full operating temperature range.
The LD39030 shows stability with a minimum effective output capacitance of 220 nF.
However, to keep stability in all operating conditions (temperature, input voltage and load variations), a minimum
output capacitor of 0.47 µF is recommended.
The suggested combination of 1 μF input and output capacitors offers a good compromise among the stability of
the regulator, optimum transient response and total PCB area occupation.
LD39030
Application information
DS11386 - Rev 4 page 8/20
7Typical characteristics
(CIN = COUT = 1 µF, VEN to VIN, TJ = 25°C unless otherwise specified)
Figure 5. Output voltage vs. temperature (I OUT = 1 mA)
AM13855V1
-40 -25 0 25 55 85 125
Output Voltage [V]
Temperature [ °C]
VIN = 4.3 V, IOUT = 1 mA
Figure 6. Output voltage vs. temperature (I OUT = 200 mA)
AM13856V1
3.2
3.22
3.24
3.26
3.28
3.3
3.32
3.34
3.36
3.38
3.4
-40 -25 0 25 55 85 125
Output Voltage [V]
Temperature [ °C]
VIN=4.3V, IOUT=200mA
Figure 7. Line regulation vs. temperature
AM13857V1
-0.15
-0.05
Line reg ulation [%/V]
Temperature [ °C]
VIN = 4.3 V to 5.5 V, IOUT = 10 mA
Figure 8. Load regulation vs. temperature
GIPD281020151129MT
0
5
10
15
20
25
30
35
40
45
50
-50 -25 0 25 50 75 100 125
Load regulation [mV]
Temperature [°C]
VIN = 2.8 V, VOUT = 1.8 V IO = 0.3 A
LD39030
Typical characteristics
DS11386 - Rev 4 page 9/20
Figure 9. Quiescent current vs. temperature (IOUT = 0 mA)
AM13859V1
0
5
10
15
20
25
30
35
40
45
50
-40 -25 0 25 55 85 125
Quiesce nt current [µA]
Temperature [ °C]
VIN = 4.3 V, IOUT = 0 mA
Figure 10. Quiescent current vs. temperature (IOUT = 200
mA)
0
20
40
60
80
100
120
140
160
180
200
220
240
260
-50 -25 0 25 50 75 100 125
Quiescent Current [µA]
Temperature [°C]
VIN = 2.8 V, VOUT=1.8 V IO = 0.3 A
GIPD281020151212MT
Figure 11. Shutdown current vs. temperature
AM13861V1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
-40 -25 0 25 55 85 125
Quiescent curr ent [µA]
Temperature [°C]
VIN = V, VEN = GND
Figure 12. Quiescent current vs. load current
VIN = 2.8 V, VOUT = 1.8 V IO = 0 to 0.3 A
GIPD281020151230MT
0.28 0.3
0.26
0.240.22
0.18 0.2
0.160.14
0.1 0.12
0.08
0.060.04
0.02
0
0
20
40
60
80
100
120
140
160
180
200
Load current [A]
Quiescent current [µA]
Figure 13. Quiescent current vs. input voltage
AM13863V1
VIN
= 2 V, V OUT
= 1 V
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6
Quiescent current [µA]
Input voltage [V]
Iout = 0 mA
Iout = 1 mA
Iout = 10 mA
Figure 14. Dropout voltage vs. temperature
AM13864V1
0
25
50
75
100
125
150
175
200
225
250
275
-40 -25 0 25 55 85 125
Dropout voltage [mV]
Temperature [
°
C]
Iout = 30 mA
Iout = 50 mA
Iout = 100 mA
Iout = 200 mA
LD39030
Typical characteristics
DS11386 - Rev 4 page 10/20
Figure 15. Supply voltage rejection vs. frequency
AM13865V1
V
IN
= 2 V +/
-
200 m
V, V
OUT = 1 V, C OUT = 1 µF
0
10
20
30
40
50
60
70
80
90
100
100 1000 10000 100000 1000000
SVR [dB]
Frequency [Hz]
Iout = 1 mA
Iout = 30 mA
Iout = 100 mA
Iout = 200 mA
Figure 16. Supply voltage rejection vs. input voltage
AM13866V1
I
OUT = 30mA
, V
OUT
=
1 V
, C
OUT = 1 µF
0
10
20
30
40
50
60
70
80
90
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
SVR [dB]
Input voltage [V]
f
= 1 kHz
f
= 10 kHz
f
= 100 kHz
Figure 17. Output noise spectral density
AM13867V1
V
IN
= 2.
0 V,
V
OUT
=
1.0 V,
C
IN
= C
OUT = 1 µF
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
10 100 1000 10000 100000
eN
[
uV / SQRT(Hz)]
Frequency [Hz]
Iout = 0 mA
Iout = 10 mA
Figure 18. Stability area vs. (COUT, ESR)
AM13868V1
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
ESR @ 100KHz[Ω]
C
OUT [µF] (nominal value)
STABILITY AREA
VIN
from 2 to 5.5 V,
I
OUT from 0 to 300 mA,
C
IN = 1 µF
Figure 19. Enable startup (VOUT = 1 V)
AM13869V1
V
IN = 2 V
,
VEN = 0 V to V IN
, I
OUT = 0.2 A ,
V
OUT =1 V,
Tr
= 5 µs
VEN
VOUT
IOUT
Figure 20. Enable startup (VOUT = 5 V)
AM13870V1
V
IN = 5.5 V ,
V
EN = 0 V to 2 V, I OUT = 0.2A
, V
OUT = 5 V,
Tr
= 5 µs
VEN
VOUT
IOUT
LD39030
Typical characteristics
DS11386 - Rev 4 page 11/20
Figure 21. Turn-on time (VOUT = 1 V)
AM13871V1
V
IN = V EN = from 0 V to 5.5 V, I OUT = 0.2 A
, V
OUT = 1 V,
Tr
= 5 µs
VIN
VOUT
IOUT
Figure 22. Turn-off time (VOUT = 1 V)
AM13872V1
V
IN = V EN = from 5.5 V to 0 V, I OUT = 0.2 A
, V
OUT = 1 V,
Tf
= 5 µs
VIN
VOUT
IOUT
Figure 23. Turn-on time (VOUT = 5 V)
VI N
VO U T
IO U T
V
IN = V EN = from 0 V to 5.5 V, I OUT = 0.2A
, V
OUT = 5 V,
Tr
= 5 µs
AM13873V1
Figure 24. Turn-off time (VOUT = 5 V)
VI N
VO U T
IO U T
V
IN = V EN = from 5.5 V to 0 V, I OUT = 0.2 A
, V
OUT = 5 V,
Tf
= 5 µs
AM13874V1
Figure 25. Line transient (VOUT = 1 V)
VI N
VO U T
V
IN
= V
EN = from 2 V to 3 V , I OUT = 10 mA
, V
OUT = 1 V,
Tr= Tf
= 5 µs
AM13875V1
Figure 26. Line transient (VOUT = 5 V)
VI N
VO U T
V
IN
= V
EN = from 5.1 V to 5.5 V, I OUT = 10 mA
, V
OUT = 5 V,
Tr=Tf
= 5 µs
AM13876V1
LD39030
Typical characteristics
DS11386 - Rev 4 page 12/20
Figure 27. Load transient (V OUT = 1 V)
VO U T
IO U T
V
IN
= V
EN = 2 V,
I
OUT = from 0 to 0.2 A
, V
OUT = 1 V,
tr=tf
= 5 µs
AM13877V1
Figure 28. Load transient (V OUT = 5 V)
VO U T
IO U T
V
IN
= V
EN = 5.5 V,
I
OUT = from 0 to 0.2 A
, V
OUT = 5 V,
tr= tf
= 5 µs
AM13878V1
LD39030
Typical characteristics
DS11386 - Rev 4 page 13/20
8Package information
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.
LD39030
Package information
DS11386 - Rev 4 page 14/20
8.1 DFN4 1x1 package information
Figure 29. DFN4 1x1 package outline
8405587_A
LD39030
DFN4 1x1 package info
DS11386 - Rev 4 page 15/20
Table 6. DFN4 1x1 mechanical data
Dim.
mm.
Min. Typ. Max.
A 0.34 0.37 0.40
A1 0 0.02 0.05
A3 0.10
b 0.17 0.22 0.27
D 0.95 1.00 1.05
D2 0.43 0.48 0.53
E 0.95 1.00 1.05
E2 0.43 0.48 0.53
e 0.65
L 0.20 0.25 0.30
K 0.15
LD39030
DFN4 1x1 package info
DS11386 - Rev 4 page 16/20
Figure 30. DFN4 1x1 recommended footprint
8405587_A
LD39030
DFN4 1x1 package info
DS11386 - Rev 4 page 17/20
9Ordering information
Table 7. Order code
Order code Output voltage (V) Auto-dishcarge Tolerance % Marking
LD39030DTPU12R(1)
1.2 Yes
2 X5
LD39030ADTPU12R 0.5 W5
LD39030DTPU18R
1.8 Yes
2 X7
LD39030ADTPU18R 0.5 W7
LD39030DTPU25R (1)
2.5 Yes
2 XA
LD39030ADTPU25R (1) 0.5 WA
LD39030DTPU28R
2.8 Yes
2 XC
LD39030ADTPU28R 0.5 WC
LD39030DTPU30R V
3.0 Yes
2 XF
LD39030ADTPU30R V 0.5 WF
LD39030DTPU33R 3.3 Yes 2 XJ
1. Available on request.
LD39030
Ordering information
DS11386 - Rev 4 page 18/20
Revision history
Table 8. Document revision history
Date Revision Changes
16-Nov-2015 1 Initial release.
18-May-2016 2 Updated Section 9: "Ordering information".
Minor text changes.
30-Aug-2016 3 Updated Ordering information.
Minor text changes.
17-May-2018 4
Updated:
VOUT parameter Table 5. Electrical characteristics and Section 9 Ordering information.
LD39030
DS11386 - Rev 4 page 19/20
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LD39030
DS11386 - Rev 4 page 20/20
