STMicroelectronics LD56100 Datasheet
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LD56100
LD56100
Datasheet
1 A very low dropout fast transient ultra-low noise linear regulator
Features
• Input voltage from 1.8 to 5.5 V
• Ultra-low dropout voltage (120 mV typ. at 1 A load and V
OUT
= 3.3 V)
• Very low quiescent current (100 µA typ. at no-load, 0.03 µA typ. in off mode)
• Output voltage tolerance: ± 1% from -40 °C to +85 °C
• Ultra-low Noise: 13 µV RMS Noise from 10 Hz to 100 kHz at V
OUT
= 3.0 V
• High PSRR (70 dB@1 kHz)
• Wide range of output voltages available on request: from 1.0 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 C
OUT
= 1 µF
• Internal current limit foldback and thermal protections
• Available in DFN8 (1.2 x 1.6 mm)
• Operating temperature range: -40 °C to 125 °C
Applications
• Mobile phones
• Tablets
• Battery-powered systems
• Camera supply
Description
The LD56100 high accuracy voltage regulator provides 1 A of current from an input voltage ranging from 1.8 V to 5.5 V, with a typical dropout voltage of 120 mV.
It is available in DFN8 (1.2 x 1.6 mm) 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 fast transient response, together with the internal soft-start circuit, make the LD56100 suitable for low power battery-operated applications.
An enable logic control function puts the LD56100 in shutdown mode allowing a total current consumption lower than 0.1 µA. Short-circuit protection with current limit foldback and thermal protection are also included.
DS12423 - Rev 2 - June 2020
For further information contact your local STMicroelectronics sales office.
www.st.com
LD56100
Diagram
1
Diagram
V
IN
EN
Enable
Bias generator
Figure 1. Block diagram
V
OUT
Thermal protection
Current protection
(*)
FB
LCON Bandgap reference
GND
Note: (*) The output discharge MOSFET is optional.
DS12423 - Rev 2 page 2/22
2
LD56100
Pin configuration
Pin configuration
Pin # DFN8
1
2
3
4
7
8
5
6
Thermal pad
Figure 2. Pin connection (top view)
3
4
1
2
6
5
8
7
Symbol
V
OUT
V
OUT
LCON
FB
GND
EN
V
IN
V
IN
GND
Table 1. Pin description
Function
Output voltage
Current limit selection.
High 1 A, low 0.5 A
Feedback pin, to be connected as close as possible to the load positive terminal
Common ground
Enable pin logic input: low = shutdown, high = active
Input voltage
Connect to GND on the PCB
DS12423 - Rev 2 page 3/22
LD56100
Typical application
3
Typical application
V
IN
C
IN
Figure 3. Typical application circuit
V
OUT
V
IN
ON
OFF
1A
0.5A
EN
LCON
LD56100
GND
FB
V
OUT
C
OUT
DS12423 - Rev 2 page 4/22
LD56100
Maximum ratings
4
Note:
Maximum ratings
Symbol
V
IN
V
OUT
V
EN
, FB, LCON
I
OUT
P
D
T
STG
T
OP
Table 2. Absolute maximum ratings
Parameter
Input voltage
Output voltage
Enable and feedback input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Value
- 0.3 to 7
- 0.3 to V
IN
+ 0.3
- 0.3 to 7
Internally limited
Internally limited
- 40 to 150
- 40 to 125
Unit
V
V
V mA mW
°C
°C
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.
Symbol
R thJA
Table 3. Thermal data
Parameter
Thermal resistance junction-ambient
Value
80
Unit
°C/W
Symbol
ESD
Parameter
Table 4. ESD performance
ESD Protection voltage
Test conditions
HBM
CDM
Value
2
500
Unit kV
V
DS12423 - Rev 2 page 5/22
5
DS12423 - Rev 2
LD56100
Electrical characteristics
Electrical characteristics
V
IN
= V at T
J
OUT(NOM)
+ 0.5 V or V
IN
= 1.8 V if greater; C
= 25 °C; min./max. values are at -40 °C ≤ T
J
IN
= C
OUT
= 1 µF, I
OUT
= 1 mA, V
EN
≤ 125 °C, unless otherwise specified.
= 1.2 V, typical values are
Table 5. Electrical characteristics
Symbol
V
IN
Parameter
Operating input voltage
Test conditions
I
∆V
∆V
V
V
Standby
I
OUT
OUT
OUT
DROP e
N
SVR
I
R
I
Q
LIM
SC
ON
V
OUT
accuracy
Static load regulation
Dropout voltage
Output noise voltage
Quiescent current
Standby current
Supply voltage rejection
Output current limit
Short-circuit current
I
V
OUT(NOM)
+ 0.5 V ≤ V
IN
≤ 5.5 V; I
OUT
= 0 to 1 A;
-40 °C ≤ T
J
≤ 85 °C
V
OUT(NOM)
+ 0.5 V ≤ V
IN
≤ 5.5 V;
I
OUT
= 0 to 1 A; -40 °C ≤ T
J
≤ 125 °C
V
OUT(NOM)
+ 0.5 V ≤ V
IN
≤ 5.0 V, I
OUT
= 10 mA
I
OUT
= 10 mA to 1000 mA
OUT
V
= 1 A;
OUT
= V
OUT(NOM)
-0.1 V
V
OUT(NOM)
V
OUT(NOM)
= 1.75 V
V
OUT(NOM)
= 1.8 V
V
OUT(NOM)
= 1.85 V
V
OUT(NOM)
V
OUT(NOM)
V
OUT(NOM)
= 3.0 V
V
OUT(NOM)
= 3.3 V
V
OUT(NOM)
V
OUT(NOM)
10 Hz to 100 kHz, I
OUT
= 10 mA, V
OUT
= 3.0 V
V
IN
= V
OUT(NOM)
+ 1 V +/- V
RIPPLE
V
RIPPLE
= 0.2 V Freq = 1 kHz, I
OUT
= 30 mA
V
IN
= V
OUT(NOM)
+ 1 V +/- V
RIPPLE
V
RIPPLE
= 0.2 V freq. = 100 kHz
I
OUT
= 30 mA
I
OUT
= 0 mA
V
IN
input current in OFF MODE: V
EN
= GND
V
OUT
= 0.9 x V
OUT(NOM)
; LCON=V
IN
or floating
V
OUT
= 0.9 x V
OUT(NOM)
; LCON=GND
V
OUT
= 0 (foldback protection); LCON=V
IN
or floating
V
IN
< 5.0 V
V
OUT
= 0 (foldback protection); LCON=GND, V
IN
< 5.0 V
Output voltage discharge
MOSFET
(LD56100DT version)
Min.
Typ.
Max.
Unit
1.8
5.5
V
-1.0
-2.0
0.002 0.06
%/V
2 6 mV
370 585
220 295
200 285
195 280
140 190 mV
130 175
125 165
120 155
100 145
90
13
135
µV
RMS
70
55
400
180
40
1.0
1.0
100 155
0.03
2.0
1100 1600
600 800
%
% dB
µA
µA mA mA
Ω page 6/22
LD56100
Electrical characteristics
Symbol Parameter
Enable input logic low
V
EN
Enable input logic high
I
EN
Enable pin input current
V
V
IN
IN
= 1.8 V to 5.5 V
= 1.8 V to 5.5 V
Test conditions Min.
Typ.
Max.
Unit
1
100
0.4
400
V nA
LCON input logic low
V
IN
= 1.8 V to 5.5 V
0.4
V
V
LCON
LCON input logic high
V
IN
= 1.8 V to 5.5 V
1
I
LCON
T
ON
LCON pin current
Turn-on time
LCON=GND
LCON = V
IN
V
OUT
= 1.8 V
550
0.1
60
700
1 nA
µs
T
SHDN
Thermal shutdown
Hysteresis
170
20
°C
C
OUT
Output capacitor 1.0
22 µF
1. Not applicable for V
OUT(NOM
)≥ 5.0 V.
2. Simulation data.
3. 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.
DS12423 - Rev 2 page 7/22
6
6.1
6.2
6.3
6.4
LD56100
Application information
Application information
Soft-start function
The LD56100 has an internal soft-start circuit. By increasing the start-up time up to 100 µs, without the need of any external soft-start capacitor, this feature is able to keep the regulator inrush current at start-up under control.
Output discharge function
The LD56100 integrates a MOSFET connected between V out
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 the auto-discharge feature.
See
Ordering information for more details.
Short-circuit and current limitation
The LD56100 is protected against short-circuit on the output. When the load current increases above 1.6 A typical the device starts limiting it to the I
LIM
value. If the load resistance decreases even more then the foldback, circuit starts limiting the current to 0.4 A when V
OUT
= 0.
When pulling LCON pin to ground, the I
LIM
and I
SC
values are reduced to 0.8 A and 0.18 A respectively.
Input and output capacitors
The LD56100 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 LD56100 requires an input capacitor with a minimum value of 1 μF. This capacitor must be located as close as possible to the input pin of the device and returned to a clean analog ground.
The control loop is designed to be stable with any good quality output ceramic capacitor (such as X5R/X7R types) with a minimum value of 1 μF and equivalent series resistance in the [3 – 300 mΩ] range. It is important to highlight that the output capacitor must maintain its capacitance and ESR in the stable region over the full operating temperature, load and input voltage ranges, to assure stability. Therefore, capacitance and ESR variations must be taken into account in the design phase to ensure the device works in the expected stability region.
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.
DS12423 - Rev 2 page 8/22
7
LD56100
Typical characteristics
Typical characteristics
(C
IN
= C
OUT
= 1 µF, V
OUT
= 3.0 V, V
EN
to V
IN
, T
J
= 25 °C unless otherwise specified)
Figure 4. Output voltage vs. temperature (V
IN
= 3.0
V, I
OUT
= 1 mA, normal mode)
Figure 5. Output voltage vs. temperature (V
IN
= 3.0
V, I
OUT
= 1 A, normal mode)
3.020
3.015
3.010
3.005
3.000
2.995
2.990
2.985
2.980
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Junction Temperature [°C]
3.020
3.015
3.010
3.005
3.000
2.995
2.990
2.985
2.980
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Junction Temperature [°C]
Figure 6. Line regulation vs. temperature
(V
OUT
= 3.0 V, I
OUT
= 1 mA)
0.1
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Junction Temperature [°C]
Figure 7. Load regulation vs. temperature
(V
OUT
= 3.0 V, I
OUT
= 1 A to 10 mA)
10
5
0
-5
20
15
-10
-15
-20
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Junction Temperature [°C]
DS12423 - Rev 2 page 9/22
DS12423 - Rev 2
LD56100
Typical characteristics
Figure 8. Quiescent current vs. temperature
(V
OUT
= 3.0 V, I
OUT
= 0 mA)
160
150
140
130
120
110
100
VIN=3.5 V
VIN=5.5 V
90
80
70
60
50
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Junction Temperature [°C]
Figure 9. Quiescent current vs. temperature
(V
OUT
= 3.0 V)
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0 1 2 3
Input Voltage [V]
4 5 6
Figure 10. Quiescent current vs. temperature
(V
IN
= 3.5 V, I
OUT
= 3.0 mA)
500
450
400
350
300
250
200
150
100
50
0 0.1
0.2
0.3
0.4
0.5
0.6
Output Current [A]
0.7
0.8
0.9
1
Figure 11. Output voltage vs. input voltage (I
OUT
= 1 mA)
2.5
2
1.5
1
3.5
3
0.5
0
0 0.5
1 1.5
2 2.5
3
V
IN
[V]
3.5
4 4.5
5 5.5
6
Figure 12. Dropout voltage vs. load current
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
0.00
VOUT=3.0 V
VOUT=1.8 V
0.10
0.20
0.30
0.40
0.50
0.60
Load Current [A]
0.70
0.80
0.90
1.00
Figure 13. Dropout voltage vs. temperature (V
OUT
= 3.0
V; I
OUT
= 1 A)
250
230
210
190
170
150
130
110
90
70
50
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Junction Temperature [ °C] page 10/22
DS12423 - Rev 2
LD56100
Typical characteristics
Figure 14. Foldback characteristic (LCON = V
IN
) Figure 15. Foldback characteristic (LCON = GND)
3.5
3
2.5
2
1.5
1
0.5
0
0.2
0.4
0.6
0.8
I
OUT
[A]
1 1.2
1.4
1.6
1.8
3.5
3
2.5
2
1.5
1
0.5
0
0 0.1
0.2
0.3
0.4
0.5
I
OUT
[A]
0.6
0.7
0.8
0.9
1
Figure 16. Supply voltage rejection vs. frequency
(V
OUT
= 3.0 V; I
OUT
= 1 mA)
40
30
20
10
0
100
80
70
60
50
1,000 frequency [Hz]
10,000 100,000
Figure 17. Noise spectral density (V
OUT
= 3.0 V;
I
OUT
= 10 mA)
10
1
0.1
0.01
0.001
10 100 1,000 f [Hz]
10,000 100,000
Figure 18. EN current vs. temperature
0.7
0.6
0.5
0.4
1
0.9
0.8
0.3
0.2
0.1
0
-40 -30 -20 -10 0
VEN=VIN
VEN=1.2V
10 20 30 40 50 60 70 80 90 100 110 120 130
Junction Temperature [ °C]
Figure 19. LCON current vs. temperature
1
0.9
0.8
0.7
0.6
0.5
LCON=GND
LCON=VIN
0.4
0.3
0.2
0.1
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
Junction Temperature [ °C] page 11/22
DS12423 - Rev 2
LD56100
Typical characteristics
Figure 20. Line transient (V
IN
= 3.5 V to 4.5 V; I
OUT
= 1 mA)
Figure 21. Turn-on V
IN
driven (V
IN
= V
EN
= 0 V to 3.5
V; I
OUT
= 1 mA)
Figure 22. Turn-on driven light load (V
IN
= 3.5 V;
V
EN
= 0 V to V
IN
; t
RISE
= 1 µs; I
OUT
= 1 mA)
Figure 23. Turn-on driven full load (V
IN
= 3.5 V; V
EN
= 0 V; t
RISE
= 1 µs; I
OUT
= 1 A)
Figure 24. Load transient (V
IN
= V
EN
= 3.5 V; t
RISE
= 1 µs; I
OUT
= 1 mA to 1 A) page 12/22
8
LD56100
Package information
Package 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.
DS12423 - Rev 2 page 13/22
8.1
LD56100
DFN8 (1.6x1.2 mm) package information
DFN8 (1.6x1.2 mm) package information
Figure 25. DFN8 (1.6x1.2 mm) package outline
BOTTOM VIEW
SIDE VIEW
TOP VIEW
SEATING
PLANE
DS12423 - Rev 2
Dim.
A
A1
A3 b
D
Table 6. DFN8 (1.6x1.2 mm) package mechanical data
Min.
0.40
0.00
0.13
mm
Typ.
0.45
0.02
0.127 Ref.
0.18
1.60 BSC
Max.
0.50
0.05
0.23
page 14/22
DS12423 - Rev 2
Dim.
D2
E2
E e
K
L
L1
LD56100
DFN8 (1.6x1.2 mm) package information
Min.
1.20
0.20
0.20
0.15
mm
Typ.
1.20 BSC
0.40 BSC
1.30
0.30
0.20
0.05 Ref.
Figure 26. DFN8 (1.6x1.2 mm) recommended footprint
0.26
0.40
0.30
0.40
1.40
0.20
1.40
Max.
1.40
0.40
0.25
page 15/22
Figure 27. Carrier tape information
LD56100
DFN8 (1.6x1.2 mm) package information
DS12423 - Rev 2 page 16/22
9
LD56100
Ordering information
Ordering information
Order code
LD56100DPU115R
LD56100DPU125R
LD56100DPU15R
LD56100DPU175R
LD56100DPU18R
LD56100DPU185R
LD56100DPU25R
LD56100DPU28R
LD56100DPU30R
LD56100DPU31R
LD56100DPU33R
Table 7. Order code
Output voltage (V)
1.15
1.25
1.5
1.75
1.8
1.85
2.5
2.8
3.0
3.1
3.3
Auto-discharge
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
S1B
S25
S28
S30
S31
S33
Marking
S1E
S1F
S15
S1A
S18
DS12423 - Rev 2 page 17/22
LD56100
Revision history
Date
09-Jan-2018
19-Jun-2020
Revision
1
2
Table 8. Document revision history
Changes
Initial release.
Added new order code LD56100DPU25R in Table 7. Order code .
DS12423 - Rev 2 page 18/22
LD56100
Contents
Contents
DS12423 - Rev 2 page 19/22
LD56100
List of tables
List of tables
DS12423 - Rev 2 page 20/22
LD56100
List of figures
List of figures
Figure 4. Output voltage vs. temperature (V
= 1 mA, normal mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 5. Output voltage vs. temperature (V
= 1 A, normal mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6. Line regulation vs. temperature (V
= 1 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 7. Load regulation vs. temperature (V
= 1 A to 10 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 8. Quiescent current vs. temperature (V
= 0 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 9. Quiescent current vs. temperature (V
= 3.0 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 10. Quiescent current vs. temperature (V
= 3.0 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 11. Output voltage vs. input voltage (I
= 1 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 13. Dropout voltage vs. temperature (V
= 1 A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 14. Foldback characteristic (LCON = V
Figure 16. Supply voltage rejection vs. frequency (V
= 1 mA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 17. Noise spectral density (V
= 10 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
= 1 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
= 1 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 22. Turn-on driven light load (V
= 1 mA) . . . . . . . . . . . . . . . . . . . . 12
Figure 23. Turn-on driven full load (V
= 1 A) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
= 1 mA to 1 A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
DS12423 - Rev 2 page 21/22
LD56100
IMPORTANT NOTICE – PLEASE READ CAREFULLY
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Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of
Purchasers’ products.
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2020 STMicroelectronics – All rights reserved
DS12423 - Rev 2 page 22/22
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