STMicroelectronics ST730 Datasheet
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ST730
Datasheet
300 mA, 28 V low-dropout voltage regulator, with 5 µA quiescent current
SOT23-5L
Maturity status link
ST732
Features
• Wide input voltage range : 2.5 V to 28 V
• Ultra-low quiescent current: typ. 5 μA at no-load, 10 μA max. across full temperature range, 1 μA max. in shutdown
• High output voltage accuracy: ± 0.5% @ 25 °C, ± 2.5% across temperature range
• Output current up to 300 mA
• Fixed output voltage versions, starting from 1.2 V to 12 V with 100 mV step
• Adjustable voltage version, starting from 1.2 V to V
IN
- V
DROP
• Stable with low ESR capacitors (0.47 µF min.)
• Thermal shutdown protection
• Current limit and SOA protection
• -40 °C to +125 °C operating temperature range
Applications
• Post regulation
• Electronic meters
• Smoke detectors / alarms
• Portable equipment
• Industrial application
Description
The ST730 is 300 mA LDO regulator, designed to be used in several medium voltage applications.
Ultra-low quiescent current of 5 μA makes it suitable for applications permanently connected to power supply/battery.
This feature is also useful when electronic modules remain permanently turned on.
The ST730 embeds protection functions, such as: current limit, short-circuit and thermal shutdown. The extended input voltage range, very low drop voltage and low quiescent current features make it suitable also for low power after-market automotive and consumer applications.
DS13036 - Rev 4 - April 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
ST730
Schematic diagram
1
Schematic diagram
Figure 1. Block diagram - Fixed version
V
IN
Bias generator
OPAMP
EN
Enable
Bandgap reference
Thermal protection
Current limit
GND
Figure 2. Block diagram - Adjustable version
V
IN
Bias generator
OPAMP
EN
Enable
Bandgap reference
Thermal protection
Current limit
GND
V
OUT
V
OUT
ADJ
DS13036 - Rev 4 page 2/23
ST730
Pin configuration
2
Pin configuration
Pin
1
2
3
4
5
Figure 3. Pin connection (top view)
5 1
2
3 4
Symbol
V
OUT
GND
V
IN
NC/ADJ
EN
Table 1. Pin description
Function
Regulated output voltage
Ground
Input voltage
Not internally connected in the fixed version. In the adjustable version, connect this pin to external resistor divider to set the output voltage
Enable pin: Low = shutdown, High = active.
Don't leave this pin floating
DS13036 - Rev 4 page 3/23
3
ST730
Typical application
Typical application
Figure 4. Typical application circuit, fixed version
V
IN
V
I
OFF
ON
EN
ST730
V
O
C
IN
C
OUT
GND
V
OUT
Figure 5. Typical application circuit, adjustable version
V
IN
C
IN
V
I
OFF
ON
EN
ST730
V
O
GND
ADJ
R
1
C
OUT
V
OUT
R
2
DS13036 - Rev 4 page 4/23
4
Note:
Note:
ST730
Maximum ratings
Maximum ratings
Symbol
I
OUT
P
D
T
ST
T
OP
V
IN
V
OUT
V
EN
V
ADJ
Table 2. Absolute maximum ratings
Parameter
DC input voltage
DC output voltage
Enable pin voltage
Adjust pin voltage
Output current
Power dissipation
Storage temperature range
Operating temperature range
Value
-0.3 to 30
-0.3 to V
IN
+ 0.3
-0.3 to 30
-0.3 to 2.5
Internally limited
Internally limited
-65 to 150
-40 to 125
Absolute maximum ratings are thosevalues beyond which damage to the device may occur. Functional operation under these conditions is not implied. All values are referred to GND.
Unit
V
V
V
V mA mW
°C
°C
Symbol
R thJA
R thJC
Table 3. Thermal data
Parameter
Thermal resistance junction-ambient
Thermal resistance junction-case
Value
190
75
R thJA
based on 4-layer (2S2P) JEDEC test board constructed based on JESD 51-7 specification.
Symbol
HBM
CDM
Table 4. Electro static discharge
Parameter
Human body model
Charged device model
Value
±2
±500
Unit
°C/W
°C/W
Unit kV
V
DS13036 - Rev 4 page 5/23
5
ST730
Electrical characteristics
Electrical characteristics
T
A
= T
J
= -40 °C to +125 °C, typical values refer to T
A
= +25 °C, V
IN
= V
EN
= V
0.1 µF, C
OUT
= 0.47 µF, unless otherwise specified (see note).
OUT
+ 1 V
, I
OUT
= 10 mA, C
IN
=
Table 5. Electrical characteristics for ST730, Fixed version
Symbol
V
IN
Parameter
Operating input voltage
Test conditions
V
ΔV
ΔV
V
DROP
I
OUT
OUT
OUT
Q
Output voltage accuracy
Static line regulation
Static load regulation
Dropout voltage
Quiescent current
Standby current
T
J
= 25 °C
-40 °C < T
J
< +125 °C
V
IN
= V
OUT(NOM)
I
OUT
I
OUT
= 100 mA, V
OUT
= V
OUT(NOM)
- 0.1 V
V
OUT(NOM)
≥ 2.5 V
I
OUT
= 300 mA, V
OUT
= V
OUT(NOM)
- 0.1 V
V
OUT(NOM)
≥ 2.5 V
I
OUT
= 0 mA
I
OUT
= 300 mA
V
IN
= 2.5 V to 28 V, V
EN
= GND
V
EN
Enable input logic low
I
I
EN e
N
SC
Enable input logic high
Enable pin current
SVR Supply voltage rejection
Short-circuit current
V
EN
= V
IN f = 10 Hz to 100 kHz, I
OUT
= 10 mA C
OUT
= 1 µF
V
IN
= V
OUT(NOM)
+ 1 V +/- V
RIPPLE
V
RIPPLE
= 0.5 V, f = 120 Hz, V
OUT(NOM)
= 5 V
V
IN
= V
OUT(NOM)
+ 1 V+/-V
RIPPLE
V
RIPPLE
= 0.5 V, f = 1 kHz, V
OUT(NOM)
= 5 V
V
IN
= V
OUT(NOM)
+ 1 V +/-V
RIPPLE
V
RIPPLE
= 0.5 V, f = 10 kHz, V
OUT(NOM)
= 5 V
V
IN
= V
OUT(NOM)
+ 1 V +/-V
RIPPLE
V
RIPPLE
= 0.5 V, f = 100 Hz, V
OUT(NOM)
= 5 V
R
L
= 0
T
SHDN
Min. Typ. Max.
2.5
-0.5
-2.5
1.2
0.003 0.05
40
200
600
5
120
0.35
70
75
75
42
35
450
160
20
28
+0.5
+2.5
70
400
1200
10
240
1
0.35
100
Unit
V
%
%
%/V mV mV mV
µA
V
V nA
µV
RMS
/V dB mA
°C
1. V
IN
= V
OUT
+ 1 V or 2.5 V, whichever is greater.
2. The device is able to properly regulate the output voltage with no load.
3. Guaranteed by design, not tested in production.
4. The current limit is a function of (V
IN
- V
OUT
) differential during operation. Maximum available current is limited. Refer to
Section 6.1 External capacitors
for more information
OUT
DS13036 - Rev 4 page 6/23
Note:
Note:
ST730
Electrical characteristics
Values in full temperature range are guaranteed by design and/or characterization tested at T
A
= ~ T cycle pulse techniques are used.
J
. Low duty
T
A
= T
J
= -40 °C to +125 °C, typical values refer to T
A
= +25 °C, V
IN
= V
EN
= 2.5 V, I
OUT
= 10 mA, C
IN
= 0.1 µF,
C
OUT
= 0.47 µF, unless otherwise specified (see note).
Table 6. Electrical characteristics for ST730, Adjustable version
Symbol
V
IN
Parameter
Operating input voltage
Test conditions Min.
2.5
Typ.
Max.
28
Unit
V
V
ADJ
I
ADJ
ΔV
ΔV
I
OUT
OUT
Q
Reference voltage accuracy
Adjust pin leakage current
Static line regulation
Static load regulation
Quiescent current
Standby current
T
J
= 25 °C
-40 °C < T
J
< +125 °C
V
IN
= 2.5 V to 28 V
I
OUT
= 1 mA to 300 mA
I
OUT
= 0 mA
I
OUT
= 300 mA
V
IN
= 2.5 V to 28 V, V
EN
= GND
1.194
-2
1.206
+2
100
0.005 0.05
0.001 0.003
5
120
0.35
10
240
1
%
% nA
%/V
%/mA
µA
T
V
I
EN
EN e
N
SVR
I
SC
SHDN
Enable input logic low
Enable input logic high
Enable pin current
Output noise voltage
Supply voltage rejection
Hysteresis
V
EN
= V
IN f = 10 Hz to 100 kHz, I
OUT
= 10 mA C
OUT
= 1 µF
V
IN
= V
OUT(NOM)
+ 1 V +/- V
RIPPLE
V
RIPPLE
= 0.5 V, f = 120 Hz, V
OUT(NOM)
= 5 V
V
IN
= V
OUT(NOM)
+ 1 V+/-V
RIPPLE
V
RIPPLE
= 0.5 V, f = 1 kHz, V
OUT(NOM)
= 5 V
V
IN
= V
OUT(NOM)
+ 1 V +/-V
RIPPLE
V
RIPPLE
= 0.5 V, f = 10 kHz, V
OUT(NOM)
= 5 V
V
IN
= V
OUT(NOM)
+ 1 V +/-V
RIPPLE
V
RIPPLE
= 0.5 V, f = 100 Hz, V
OUT(NOM)
= 5 V
R
L
= 0
1.2
70
75
75
42
35
450
160
20
0.35
100
µV
V
V nA
RMS
°C
/V dB mA
1. The device is able to properly regulate the output voltage with no load.
2. Guaranteed by design, not tested in production.
3. The current limit is a function of (V
IN
- V
OUT
) differential during operation. Maximum available current is limited. Refer to
Section 6.4 Protection features for more information.
OUT
Values in full temperature range are guaranteed by design and/or characterization tested at T
A
= ~ T cycle pulse techniques are used.
J
. Low duty
DS13036 - Rev 4 page 7/23
6
6.1
6.2
6.3
ST730
Application information
Application information
External capacitors
The ST730 voltage regulator requires external capacitors to ensure the control loop stability. These capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance defined in the following chapters. Input and output capacitors should be located as close as possible to the relevant pins.
Input capacitor
An input capacitor, whose minimum value is 0.1 μF, must be placed as close as possible to the input in of the device and returned to a clean analog ground. A good quality, low-ESR ceramic capacitor is suggested. It helps to ensure stability of the control loop, reduces the effects of inductive sources and improves ripple rejection.
Values, which are higher than 0.1 μF, are suggested in case of fast load transients in the application. There is no maximum limit to the output capacitanceAn input capacitor, whose minimum value is 0.1 μF, must be placed as close as possible to the input in of the device and returned to a clean analog ground. A good quality, low-ESR ceramic capacitor is suggested. It helps to ensure stability of the control loop, reduces the effects of inductive sources and improves ripple rejection. Values, which are higher than 0.1 μF, are suggested in case of fast load transients in the application. There is no maximum limit to the output capacitance.
Output capacitor
The ST730 requires a capacitor connected on its output, to keep the control loop stable and reduce the risk of ringing and oscillations. The control loop is designed to be stable with any good quality ceramic capacitor (such as X5R/X7R types) with a minimum value of 0.47 μF and equivalent series resistance in the [5 – 500 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.
There is no maximum limit to the output capacitance, provided that the above conditions are satisfied.
Output voltage adjustment
In the adjustable version the output voltage can be adjusted to any voltage, starting from 1.2 V (V
ADJ
) up to the input voltage minus the voltage drop (V
DROP
) across the internal power pass element, by connecting a resistor divider between the ADJ pin and the output, allowing the remote voltage sensing.
The resistor divider should be selected using the following equation:
VOUT = VADJ 1 + R1/R2 with V
ADJ
= 1.2 V (typ.) and V
OUT
< V
IN
- V
DROP(MAX)
For best accuracy and stability the resistor divider should be designed in order to allow that a current of at least
500 nA flows across it. The current flowing into the ADJ pin is typically less than 10 nA, therefore it causes negligible change in the final output voltage.
(1)
Power dissipation
A proper PCB design is recommended, to ensure that the device internal junction temperature is kept below
125 °C, in all the operating condition. The thermal energy generated by the device flows from the die surface to the PCB copper area through the package leads. The PCB copper area acts as a heat sink. The footprint copper pads should be as wider as possible to spread and dissipate the heat to the surrounding environment. Thermal micro-vias to the inner or backside copper layers improve the overall thermal performance of the device.
The power dissipation of the LDO depends on the input voltage, output voltage and output current, and is given by:
PD = VIN − VOUT IOUT (2)
The junction temperature of the device is:
TJ_MAX = TA + RtℎJA × PD (3)
DS13036 - Rev 4 page 8/23
6.4
ST730
Protection features where: T
J_MAX
is the maximum junction of the die,125 °C; T
A
is the ambient temperature; R thJA
is the thermal resistance junction-to-ambient.
With the above equation it is possible to calculate the maximum allowable power dissipation, therefore the maximum load current for a certain voltage drop. Appropriate de-rating of the operating condition can be applied accordingly.
Protection features
Current limit
Due to the wide input voltage range, high power dissipation could occur in case of damaged/shorted load. For this reason the ST730 embeds a SOA protection-current limit circuit, which acts in case of overload or short-circuit on the output, clamping the load current to a safe value.
The current limit value is purposely made depended on the voltage drop (V
IN
- V
OUT
), so that the maximum dissipated power is always kept under control.
be taken into account to calculate the maximum load current the device can supply for a certain dropout voltage.
Normal operation is restored if the overload disappears, but prolonged operation in current limit may lead to high power dissipation inside the LDO and subsequently to thermal shutdown.
Thermal protection
An internal thermal feedback loop disables the output voltage if the die temperature reaches approximately
160 °C. This feature protects the device from excessive temperature that could lead to permanent damage to the
LDO.
Once the thermal protection is triggered and the device is shut down, normal operation is automatically recovered if the die temperature falls below 140 °C (thermal protection hysteresis of 20 °C typically).
Continuous operation above the maximum ratings may lead to permanent damage to the device.
In case of operation with strongly inductive loads, undershoots on the output may happen. If those negative spikes overcome the absolute maximum ratings of the device, permanent damage may occur. A schottky diode connected in parallel to the output port reduces the risk of damages in such operating cases.
DS13036 - Rev 4 page 9/23
ST730
Typical performance characteristics
7
Typical performance characteristics
Figure 6.
C
IN
= C
OUT
= 1 μF, V
IN
= 2.5 V, V
OUT
= V
ADJ
, T
J
= 25 °C, unless otherwise specified.
Reference voltage vs. temperature, no load
V
OUT
= V
ADJ
1.250
1.240
1.230
1.220
1.210
1.200
1.190
1.180
1.170
1.160
1.150
-60 -40 -20 0
VIN=2.5V
VIN=10V
VIN=18V
VIN=28V
20 40
Temperature [ºC]
60 80 100 120 140
Figure 7. Reference voltage vs. load current and temperature
V
OUT
= V
ADJ
1.250
1.240
1.230
1.220
1.210
1.200
1.190
1.180
1.170
1.160
1.150
0 50
-40°C
25°C
125°C
250 300 100 150
Load current [mA]
200
Figure 8. Output voltage vs. temperature
V
OUT
= 5 V
5.300
5.250
5.200
5.150
5.100
5.050
5.000
4.950
4.900
4.850
4.800
4.750
4.700
-60 -40 -20 0
VIN=6V
VIN=28V
20 40
Temperature [ºC]
60 80 100 120 140
Figure 9. Output voltage vs. temperature (I
OUT
= 300 mA)
V
OUT
= 5 V
5.300
5.250
5.200
5.150
5.100
5.050
5.000
4.950
4.900
4.850
4.800
4.750
4.700
-60 -40 -20 0 20 40
Temperature [ºC]
60 80 100 120 140
DS13036 - Rev 4 page 10/23
Figure 10. Dropout voltage vs. temperature
V
OUT
= 5 V, I
OUT
= 100, 200 and 300 mA
450
350
250
150
50
-60
950
850
750
650
550
IOUT=100mA
IOUT=200mA
IOUT=300mA
-40 -20 0 20 40 60
Temperature [ºC]
80 100 120 140
0.01
Figure 12. Load regulation vs. temperature
V
IN
= 2.5V, V
OUT
= V
ADJ
, I
OUT
= 10 mA to 300 mA
0.00
-0.01
-60 -40 -20 0 20 40
Temperature [ºC]
60 80 100 120 140
ST730
Typical performance characteristics
0.10
Figure 11. Line regulation vs. temperature
V
IN
= 2.5 V to 28 V, V
OUT
=V
ADJ
, I
OUT
=10 mA
0.00
-0.10
-60 -40 -20 0 20 40
Temperature [ºC]
60 80 100 120 140
Figure 13. Quiescent current vs. input voltage
(I
OUT
= 0 mA)
8
6
4
2
12
10
0
0
-40°C
25°C
125°C
5 10 15
Input voltage [V]
20 25 30
DS13036 - Rev 4 page 11/23
Figure 14. Quiescent current vs. temperature
(I
OUT
= 0 mA)
12
10
VIN=2.5V
VIN=28V
8
6
4
2
0
-60 -40 -20 0 20 40 60
Temperature [ºC]
80 100 120 140
160
140
120
100
80
60
40
20
0
0
Figure 16. Quiescent current vs. load current
V
IN
= 2.5 V, V
OUT
= V
ADJ
, I
OUT
= 0 mA to 300 mA
50 200 250 100 150
I
OUT
[mA]
300
ST730
Typical performance characteristics
Figure 15. Quiescent current vs. temperature
(I
OUT
= 300 mA)
250
VIN=2.5V
200
150
100
50
0
-60 -40 -20 0 20 40
Temperature [ºC]
60 80 100 120 140
Figure 17. Standby current vs. temperature
V
EN
= GND
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
-60 -40
VIN=2.5V
VIN=28V
-20 0 20 40
Temperature [ºC]
60 80 100 120 140
DS13036 - Rev 4 page 12/23
Figure 18. Short circuit current vs. dropout voltage
V
IN
= 2.5 V to 28 V, V
OUT
= 0 V
600
500
400
300
200
100
0
0 5 25 30 10 15
Dropout voltage [V]
20
ST730
Typical performance characteristics
Figure 19. Current limit vs. temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-60 -40 -20 0
V
IN
= 2.5 V, V
OUT
= 0 V
20 40 60
Temperature [ºC]
80 100 120 140
Figure 20. PSRR vs. frequency
V
IN
= 6 V + V
Ripple
, V
OUT
= 5 V, I
OUT
= 10 mA, 100 mA, C
IN
= 0.1 µF, C
OUT
= 0.47 µF
75
70
65
60
55
50
45
40
35
30
95
90
85
80
25
20
15
10
5
0
0.01
0.10
1.00
10.00
Iload=10mA
Iload=100mA
100.00
1,000.00
Frequency (kHz)
Figure 21. Output noise spectrum
V
IN
= 6 V, V
OUT
= 5 V, I
OUT
= 10 mA, C
IN
= 0.1 µF, C
OUT
= 0.47 µF
10.00
1.00
0.10
0.01
0.01
0.1
1 10
Frequency: f [kHz]
100 1000
Figure 22. Line transient Figure 23. Load transient
DS13036 - Rev 4 page 13/23
Figure 24. Startup transient
ST730
Typical performance characteristics
Figure 25. Enable transient
DS13036 - Rev 4 page 14/23
8
8.1
ST730
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.
SOT23-5L package information
Figure 26. SOT23-5L package outline
DS13036 - Rev 4
Dimension
H
L
θ
E e
A
A1
A2 b c
D
Table 7. SOT23-5L package mechanical data mm
Typ.
Min.
0.90
0
0.90
0.30
0.09
2.95
1.60
0.95
2.80
0.30
0
7049676
Max.
1.45
0.15
1.30
0.50
0.20
0.60
10 page 15/23
Note: Dimensions are in mm
Figure 27. SOT23-5L recommended footprint
ST730
SOT23-5L package information
DS13036 - Rev 4 page 16/23
8.2
Packing information
Figure 28. SOT23-5L tape and reel drawing
ST730
Packing information
DS13036 - Rev 4
Dimension
Table 8. SOT23-5L tape and reel mechanical data
Min.
mm
Typ.
T
Ao
Bo
Ko
Po
P
W
A
C
D
N
12.8
20.2
60
3.9
3.9
7.9
13.0
3.15
3.2
1.4
4.0
4.0
8
Max.
180
13.2
14.4
4.1
4.1
8.3
page 17/23
ST730
Ordering information
9
Note:
Ordering information
Order code
ST730M28R
ST730M33R
ST730M36R
ST730M50R
ST730MR
1. Available on request
Table 9. Order code
Output voltage
2.8 V
3.0 V
3.3 V
3.6 V
5.0 V
Adjustable
Other voltage options can be available on request. Contact local sales office.
Marking
028
030
033
036
050
0AD
DS13036 - Rev 4 page 18/23
ST730
Revision history
Date
17-Jun-2019
18-Feb-2020
15-Jun-2020
22-Apr-2021
Revision
1
2
3
4
Table 10. Document revision history
Changes
Initial release.
Updated V
OUT
, ΔV
OUT
values in Table 5 and V
ADJ
values in Table 6.
Added new order codes in Order code.
Added new order codes in
DS13036 - Rev 4 page 19/23
ST730
Contents
Contents
DS13036 - Rev 4 page 20/23
ST730
List of tables
List of tables
DS13036 - Rev 4 page 21/23
ST730
List of figures
List of figures
Figure 9. Output voltage vs. temperature (I
= 300 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 13. Quiescent current vs. input voltage (I
= 0 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 14. Quiescent current vs. temperature (I
= 0 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 15. Quiescent current vs. temperature (I
= 300 mA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
DS13036 - Rev 4 page 22/23
ST730
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DS13036 - Rev 4 page 23/23
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