February 2012 Doc ID 15541 Rev 8 1/20
1
L5150BN
5 V low dropout voltage regulator
Features
■Operating DC supply voltage range
5.6 V to 40 V
■Low dropout voltage
■Low quiescent current
■Precison output voltage 5 V ±2%
■Very wide stability range with low value output
capacitor
■Thermal shutdown and short-circuit protection
■Wide temperature range (Tj = -40 °C to 150 °C)
Description
L5150BN is a low dropout linear 5 V regulator
particularly suitable for automotive applications.
High output voltage accurancy (2%) is kept over
wide temperature range line and load variation.
Its sophisticated design allows to have extremely
low quiescent current.
The maximum input voltage is 40 V.
The regulator output current is internally limited
and the device is protected against short-circuit,
overload and overtemperature conditions. In
addition, only low-value ceramic capacitor on
output is required for stability.
Max DC supply voltage VS 40 V
Max output voltage tolerance ΔVo±2%
Max dropout voltage Vdp 500 mV
Output current I0150 mA
Quiescent current Iq50 µA(1)
1. Typical value.
SOT-223
'!0'03
Table 1. Device summary
Package
Order codes
Tube Tape & reel
SOT-223 L5150BN L5150BNTR
www.st.com
Contents L5150BN
2/20 Doc ID 15541 Rev 8
Contents
1 Block diagram and pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Package and PCB thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 SOT-223 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 Package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 ECOPACK® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 SOT-223 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 SOT-223 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
L5150BN List of tables
Doc ID 15541 Rev 8 3/20
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 5. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 6. SOT-223 thermal parameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 7. SOT-223 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 8. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
List of figures L5150BN
4/20 Doc ID 15541 Rev 8
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Output voltage vs. Tj . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. Output voltage vs. VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Drop voltage vs. output current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Current consumption vs. output current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Current consumption vs. output current (at light load condition). . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. Current consumption vs. input voltage (Io = 0.1 mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. Current consumption vs. input voltage (Io = 75 mA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 9. Current limitation vs. Tj. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 10. Current limitation vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 11. Short-circuit current vs. Tj. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 12. Short-circuit current vs. input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 13. PSRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 14. Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 15. Stability region . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 16. Maximum load variation response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 17. SOT-223 PC board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 18. Rthj-amb vs. PCB copper area in open box free air condition . . . . . . . . . . . . . . . . . . . . . . 12
Figure 19. SOT-223 thermal impedance junction ambient single pulse . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 20. Thermal fitting model of Vreg in SOT-223 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 21. SOT-223 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 22. SOT-223 tape and reel shipment (suffix “TR”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
L5150BN Block diagram and pins description
Doc ID 15541 Rev 8 5/20
1 Block diagram and pins description
Figure 1. Block diagram
Table 2. Pins description(1)
1. For the pins configuration see outlines at page 1.
N° Pin name Function
1V
S
Supply voltage, block directly to GND on the IC with a
capacitor.
2 GND Ground reference
3V
o
5 V regulated output. Block to GND with a ceramic capacitor
(C0 > 220 nF for regulator stability)
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Electrical specifications L5150BN
6/20 Doc ID 15541 Rev 8
2 Electrical specifications
2.1 Absolute maximum ratings
Stressing the device above the rating listed in the Table 3: Absolute maximum ratings may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability. Refer also to the STMicroelectronics SURE
program and other relevant quality documents.
2.2 Thermal data
m
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
Vsdc DC supply voltage -0.3 to 40 V
Isdc Input current internally limited
VoDC output voltage -0.3 to 6 V
IoDC output current internally limited
TjJunction temperature -40 to 150 °C
VESD HBM ESD voltage level (HBM-MIL STD 883C) ±2 kV
VESD CDM ESD voltage level (CDM AEC-Q100-011) ±750 V
Table 4. Thermal data(1)
1. The values quoted are for PCB 58 mm x 58 mm x 2 mm, FR4, double copper layer with single heatsink
layer, copper thickness 35 µm, copper area 2 cm2.
Symbol Parameter Value Unit
Rthj-case
Thermal resistance junction to case:
SOT-223 20 °K/W
Rthj-amb
Thermal resistance junction to ambient:
SOT-223 79 °K/W
L5150BN Electrical specifications
Doc ID 15541 Rev 8 7/20
2.3 Electrical characteristics
Values specified in this section are for VS = 5.6 V to 31 V, Tj = -40 °C to +150 °C unless
otherwise stated.
Table 5. General
Pin Symbol Parameter Test condition Min. Typ. Max. Unit
VoVo_ref Output voltage VS = 8 V to 18 V,
Io = 8 mA to 150 mA 4.9 5.0 5.1 V
VoVo_ref Output voltage VS = 5.6 V to 31 V,
Io = 8 mA to 150 mA 4.85 5.0 5.15 V
VoVo_ref Output voltage VS = 5.6 V to 31 V,
Io = 0.1 mA to 8 mA 4.75 5.0 5.25 V
VoIshort Short-circuit current VS = 13.5 V 0.65 1.10 1.45 A
VoIlim Output current limitation(1) VS = 13.5 V 0.28 0.45 0.66 A
VS, VoVline Line regulation voltage VS = 6 V to 28 V, Io = 30 mA 40 mV
VoVload Load regulation voltage
VS = 8 V to 18 V,
Io = 8 mA to 150 mA 55
mV
VS = 13.5 V,
Tj = 25 °C,
Io = 8 mA to 150 mA
40
VS, VoVdp Drop voltage(2) Io = 150 mA 500 mV
VS, VoSVR Ripple rejection fr = 100 Hz(3) 60 dB
VoIoth_H
Normal consumption mode
output current VS = 8 V to 18 V 8 mA
VoIoth_L
Very low consumption mode
output current VS = 8 V to 18 V 1.1 mA
VoIoth_Hyst
Output current switching
threshold hysteresis VS = 13.5 V, Tj = 25 °C 0.8 mA
VS, Vo I
qn_1 Current consumption
Iqn_1 = IVs – Io
VS = 13.5 V,
Io = 0.1 mA to 1 mA, Tj = 25 °C 50 80
µA
VS = 13.5 V, Io = 0.1 mA to 1 mA, 95
VS, VoIqn_150
Current consumption
Iqn_150 = IVs – Io
VS = 13.5 V, Io = 150 mA 3.2 4.2 mA
TwThermal protection temperature 150 190 °C
Tw_hy
Thermal protection temperature
hysteresis 10 °C
1. Measured output current when the output voltage has dropped 100 mV from its nominal value obtained at 13.5 V and Io =
75 mA.
2. VS - Vo measured dropout when the output voltage has dropped 100 mV from its nominal value obtained at 13.5 V and Io =
75 mA.
3. Guaranteed by design.
Electrical specifications L5150BN
8/20 Doc ID 15541 Rev 8
2.4 Electrical characteristics curves
Figure 2. Output voltage vs. TjFigure 3. Output voltage vs. VS
Figure 4. Drop voltage vs. output current
Figure 5. Current consumption vs. output
current
Figure 6. Current consumption vs. output
current (at light load condition)
Figure 7. Current consumption vs. input
voltage (Io = 0.1 mA)
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L5150BN Electrical specifications
Doc ID 15541 Rev 8 9/20
Figure 8. Current consumption vs. input
voltage (Io = 75 mA)
Figure 9. Current limitation vs. Tj
Figure 10. Current limitation vs. input voltage Figure 11. Short-circuit current vs. Tj
Figure 12. Short-circuit current vs. input
voltage
Figure 13. PSRR
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F REQUENCY [KHz]
PSRR [dB]
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Electrical specifications L5150BN
10/20 Doc ID 15541 Rev 8
2.5 Application information
The voltage regulator uses a p-channel mos transistor as a regulating element. With this
structure a very low dropout voltage at current up to 150 mA is obtained. The output voltage
is regulated up to input supply voltage of 40 V. The high-precision of the output voltage (2%)
is obtained with a pre-trimmed reference voltage. The voltage regulator automatically adapts
its own quiescent current to the output current level. In light-load conditions the quiescent
current goes to 55 µA only (low consumption mode). This procedure features a certain
hysteresis on the output current (see Figure 6). Short-circuit protection to GND and a
thermal shutdown are provided.
Figure 14. Application schematic
The input capacitor µF is necessary as backup supply for negative pulses which
may occur on the line. The second input capacitor nF is needed when the C1 is too
distant from the VS pin and it compensates smooth line disturbances. The C0 ceramic
capacitor, connected to the output pin, is for bypassing to GND the high-frequency noise
and it guarantees stability even during sudden line and load variations. Suggested value is
nF with .
Stability region is reported in Figure 15.
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L5150BN Electrical specifications
Doc ID 15541 Rev 8 11/20
Figure 15. Stability region
Figure 16. Maximum load variation response
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Note: The curve which describes the minimum ESR is derived from characterization data on the regulator
with connected ceramic capacitors which feature low ESR values (at 100 kHz). Any capacitor with
further lower ESR than the given plot value must be evaluated in each and every case.
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Package and PCB thermal data L5150BN
12/20 Doc ID 15541 Rev 8
3 Package and PCB thermal data
3.1 SOT-223 thermal data
Figure 17. SOT-223 PC board
Figure 18. Rthj-amb vs. PCB copper area in open box free air condition
.
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Note: Layout condition of Rth and Zth measurements (PCB: double layer,
FR4 area= 58 mm x 58 mm, PCB thickness = 2 mm, Cu thickness = 35 µm (front and back side),
footprint dimension 4.1 mm x 6.5 mm ).
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L5150BN Package and PCB thermal data
Doc ID 15541 Rev 8 13/20
Figure 19. SOT-223 thermal impedance junction ambient single pulse
Equation 1: pulse calculation formula
where δ = tP/T
Figure 20. Thermal fitting model of Vreg in SOT-223
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Package and PCB thermal data L5150BN
14/20 Doc ID 15541 Rev 8
Table 6. SOT-223 thermal parameter
Area (cm2) Footprint 2
R1 (°K/W) 1.53
R2 (°K/W) 3.21
R3 (°K/W) 5.2
R4 (°K/W) 24
R5 (°K/W) 0.1
R6 (°K/W) 100 45
C1 (W.s/°K) 0.00004
C2 (W.s/°K) 0.0003
C3 (W.s/°K) 0.03
C4 (W.s/°K) 0.16
C5 (W.s/°K) 1000
C6 (W.s/°K) 0.5 2
L5150BN Package and packing information
Doc ID 15541 Rev 8 15/20
4 Package and packing information
4.1 ECOPACK®
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.
4.2 SOT-223 mechanical data
Figure 21. SOT-223 package dimensions
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Package and packing information L5150BN
16/20 Doc ID 15541 Rev 8
Table 7. SOT-223 mechanical data
DIM.
mm. inch
Min. Typ. Max. Min. Typ. Max.
A 1.8 0.071
B 0.6 0.7 0.85 0.024 0.027 0.033
B1 2.9 3 3.15 0.114 0.118 0.124
c 0.24 0.26 0.35 0.009 0.01 0.014
D 6.3 6.5 6.7 0.248 0.256 0.264
e 2.3 0.09
e1 4.6 0.181
E 3.3 3.5 3.7 0.13 0.138 0.146
H 6.7 7 7.3 0.264 0.276 0.287
V10 (max)
A1 0.02 0.1 0.0008 0.004
L5150BN Package and packing information
Doc ID 15541 Rev 8 17/20
4.3 SOT-223 packing information
Figure 22. SOT-223 tape and reel shipment (suffix “TR”)
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Revision history L5150BN
18/20 Doc ID 15541 Rev 8
5 Revision history
Table 8. Document revision history
Date Revision Changes
18-Jun-2007 1 Initial release.
14-May-2008 2
Corrected Table 2: Pins description : inverted 1 and 3 pins
descriptions.
Updated Table 5: General :
–V
o_ref parameter: updated test conditions and values.
–V
line and Vshort : updated test condition
– Ishort: changed values from 0.65/0.95/1.25 to 0.65/1.10/1.45
(Min/Typ/Max)
–I
lim: changed values from 0.7/1/1.30 to 0.28/0.45/0.66, added note
–V
dp: added note
– Inserted Ioth_L, Ioth_H, Ioth_Hyst rows
–I
qn_1: changed values from 38/48 to 48/70 (Typ/Max).
09-Sep-2008 3 Updated Table 5: General :
–V
load parameter: changed test conditions.
L5150BN Revision history
Doc ID 15541 Rev 8 19/20
16-Jun-2009 4
Updated corporate template (from V2 to V3)
Changed document title
Section : Features on cover page
–I
q on table: changed value from 48 µA to 50 µA
– Added row in bullet list
Table 2: Pins description
Vo: changed ceramic capacitor expression for Function
Table 3: Absolute maximum ratings
– Updated all symbols
Table 4: Thermal data
–R
thj-amb: changed value
– Updated TableFootnote
Table 5: General
–V
load: changed max value for Vs = 8 V to 18 V, added new row
–I
qn_1: changed Test condition (added Tj = 25 °C), changed typ/max
value for Tj = 25 °C , added new row
–I
qn_150: changed typ value
Added Figure 2: Output voltage vs. Tj
Added Figure 3: Output voltage vs. VS
Added Figure 4: Drop voltage vs. output current
Added Figure 5: Current consumption vs. output current
Added Figure 6: Current consumption vs. output current (at light load
condition)
Added Figure 7: Current consumption vs. input voltage (Io = 0.1 mA)
Added Figure 8: Current consumption vs. input voltage (Io = 75 mA)
Added Figure 9: Current limitation vs. Tj
Added Figure 10: Current limitation vs. input voltage
Added Figure 11: Short-circuit current vs. Tj
Added Figure 12: Short-circuit current vs. input voltage
Added Figure 13: PSRR
Section 2.5: Application information
– Changed section title from “Voltage regulator“ to “Application
information“
– Updated text
– Added Figure 14: Application schematic
– Added Figure 16: Maximum load variation response
Added Section 3: Package and PCB thermal data
Changed Section 4.1: ECOPACK®
04-Dec-2009 5 Updated features list.
Updated Section 2.5: Application information.
06-Apr-2010 6 Updated Table 5: General:
–I
qn_1 and Iqn_150: updated test parameter.
30-Jan-2012 7 Modified Figure 15: Stability region on page 11.
07-Feb-2012 8 Modified Figure 15: Stability region on page 11.
Table 8. Document revision history (continued)
Date Revision Changes
L5150BN
20/20 Doc ID 15541 Rev 8
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