LD49100
Datasheet
Automotive-grade, 1 A, low quiescent current, low-noise regulator with soft-start
Features
DFN6 (3x3)
Wettable Flanks
•
•
•
•
•
•
•
•
•
AEC-Q100 qualified
Temperature range: -40 °C to 125 °C
Input voltage from 1.5 to 5.5 V
Ultra low-dropout voltage (200 mV typ. at 1 A load)
Very low quiescent current (20 µA typ. at no load, 200 µA typ. at 1 A load, 1 µA
max. in off mode)
Very low-noise with no bypass capacitor (30 µVRMS at VOUT = 0.8 V)
•
•
•
Output voltage tolerance: ± 2.0% at 25 °C
1 A guaranteed output current
Wide range of output voltages available on request: 0.8 V to 4.5 V with 100 mV
step and adjustable from 0.8 V
Logic-controlled electronic shutdown
Power Good function
Stable with ceramic capacitors COUT = 1 µF
•
•
Internal current and thermal limit
DFN6 (3x3 mm) package with wettable flanks
Applications
Maturity status link
LD49100
•
•
•
•
Infotainment and cluster
ADAS
Telematics
Body electronics
Description
The LD49100 provides 1 A maximum current with an input voltage range from 1.5 V
to 5.5 V and a typical dropout voltage of 200 mV. The device is stable with ceramic
capacitors on the input and output.
The ultra low-dropout voltage, low quiescent current and low-noise features make it
suitable for a wide range of automotive applications. Power supply rejection is 70 dB
at low frequency and starts to roll off at 10 kHz. Enable logic control function puts the
LD49100 in shutdown mode, allowing a total current consumption lower than 1 μA.
The device features a precise Power Good indicator, useful to monitor and sequence
functions. Internal 1 ms soft-start circuit allows the reduction of inrush current.
The device includes the short-circuit constant current limiting and thermal protection.
The LD49100 is available in AEC-Q100 grade 1 qualified version, in a small 6-pin
DFN6 (3x3 mm) with wettable flank package.
DS13115 - Rev 4 - February 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
LD49100
Circuit schematics
1
Circuit schematics
Figure 1. LD49100 schematic diagram (adjustable version)
IN
PG
Power-good
signal
IN
BandGap
reference
Current
limit
OpAmp
OUT
Thermal
protection
ADJ
EN
Internal
enable
GND
Figure 2. LD49100 schematic diagram (fixed version)
IN
PG
Power-good
signal
IN
BandGap
reference
Current
limit
OpAmp
OUT
Thermal
protection
R1
VSENSE
EN
R2
Internal
Internal
enable
enable
GND
DS13115 - Rev 4
page 2/28
LD49100
Pin configuration
2
Pin configuration
Figure 3. Pin connection (top view)
EN
1
6
VIN
GND
2
5
VSENSE
PG
3
4
VOUT
EN
1
6
VIN
GND
2
5
ADJ
PG
3
4
VOUT
LD49100 (fixed version)
LD49100 (adjustable version)
Table 1. Pin description
Pin
Symbol
LD49100
Function
LD49100
(adjustable version) (fixed version)
Enable input: set VEN = high to turn on the device
EN
1
1
VEN = low to turn off the device
Don't leave this pin floating
GND
2
2
Common ground
PG
3
3
Power Good
VOUT
4
4
Output voltage
ADJ: adjust pin on the adjustable version. Connect to resistor divider to
set the output voltage.
ADJ/VSENSE
5
5
VSENSE: output voltage sensing pin on fixed versions. Connect to VOUT.
Allows remote sensing
VIN
GND
DS13115 - Rev 4
6
6
Exposed pad
LDO input voltage
Exposed pad has to be connected to GND
page 3/28
LD49100
Absolute maximum ratings
3
Absolute maximum ratings
Stressing the device above the rating listed in Table 2. 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 may affect device reliability.
Table 2. Absolute maximum ratings
Symbol
VIN
Parameter
DC input voltage
VOUT /VSENSE
Value
Unit
-0.3 to 7
V
-0.3 to VIN + 0.3
DC output voltage, output voltage sense pin
V
(7 V max.)
EN
Enable pin
-0.3 to 7
V
PG
Power Good pin
-0.3 to 7
V
ADJ
Adjust pin
4
V
IOUT
Output current
Internally limited
Power dissipation
Internally limited
PD
TSTG
Storage temperature range
- 65 to 150
°C
TOP
Operating junction temperature range
- 40 to 125
°C
TJ-MAX
Maximum junction temperature range
150
°C
Table 3. Thermal data
Symbol
Note:
Parameter
Value
Unit
RthJA
Thermal resistance junction-ambient
55
°C/W
RthJC
Thermal resistance junction-case
10
°C/W
RthJA for DFN6 based on a 4-layer JEDEC PCB (2S2P) test board with 2 thermal vias.
Table 4. ESD performance
Symbol
ESD
DS13115 - Rev 4
Parameter
ESD protection voltage
Test conditions
Value
Unit
HBM
2
kV
CDM
500
CDM corner pins
750
V
page 4/28
LD49100
Electrical characteristics
4
Electrical characteristics
Table 5. LD49100 electrical characteristics (adjustable version) TJ = 25 °C, VIN = 1.8 V, CIN = COUT = 1 µF,
IOUT = 100 mA, VEN = VIN, unless otherwise specified.
Symbol
VIN
Parameter
Test conditions
Operating input voltage
VADJ accuracy
IOUT = 10 mA
-40 °C < TJ < 125 °C
IADJ
∆VOUT
VOUT + 1 V ≤ VIN ≤ 5.5 V
IOUT = 100 mA
(1)
IOUT = 100 mA, tR = 5 µs
∆VIN = 500 mV
IOUT = 100 mA, tF = 5 µs
∆VOUT
Static load regulation
IOUT = 10 mA to 1 A
Transient load regulation
tR = 5 µs
IOUT = 10 mA to 1 A
∆VOUT
(1)
IOUT = 1 A to 10 mA, tF = 5 µs
VDROP
Dropout voltage (2)
Unit
5.5
V
800
816
776
800
824
1
Static line regulation
Transient line regulation
Max.
784
Adjust pin current
∆VIN = 500 mV
∆VOUT
Typ.
1.5
IOUT = 10 mA, TJ = 25 °C
VADJ
Min.
IOUT = 1 A VO fixed to 1.5 V
-40 °C < TJ < 125 °C
0.01
mV
µA
%/V
10
mVpp
10
0.001
%/mA
40
mVpp
40
200
400
mV
10 Hz to 100 kHz
eN
Output noise voltage
IOUT = 100 mA
µVRMS
30
VOUT = 0.8 V
VIN = 1.8 V+/-VRIPPLE
VRIPPLE = 0.25 V
SVR
Supply voltage rejection
VO = 0.8 V
70
frequency = 1 kHz, IOUT = 10 mA
dB
VIN = 1.8 V+/-VRIPPLE
VRIPPLE = 0.25 V
VRIPPLE = 0.25 V
65
frequency = 10 kHz, IOUT = 100 mA
IOUT = 0 mA
20
IOUT = 0 mA
50
-40 °C < TJ < 125 °C
IQ
Quiescent current
IOUT = 0 to 1 A
200
IOUT = 0 to 1 A
300
-40 °C < TJ < 125 °C
VIN input current in off mode:
VEN = GND (3)
DS13115 - Rev 4
µA
0.001
1
page 5/28
LD49100
Electrical characteristics
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
VPG_ON (4)
Power Good output
threshold, rising
-40 °C < TJ < 125 °C
93
99
VPG_OFF (4)
Power Good output
threshold, falling
-40 °C < TJ < 125 °C
91 (5)
95
Minimum Power Good
threshold
-40 °C < TJ < 125 °C
91
VPG_L
Power Good output
voltage low
Isink = 6 mA open drain output
ISC
Short-circuit current
RL= 0
Enable input logic low
VIN = 1.5 V to 5.5 V
Enable input logic high
-40 °C < TJ< 125 °C
IEN
Enable pin input current
VEN = VIN
tSS
Soft-start time (1)
From enable to 95% of VOUT(NOM)
VPG_MIN
VEN
TSHDN
COUT
%VOUT
%VOUT_
NOM
0.4
A
0.4
V
0.9
0.5
V
0.1
100
nA
1
1.5
ms
160
Hysteresis
20
Capacitance (see Section 5 )
V
2.5
Thermal shutdown
Output capacitor
Unit
°C
1
µF
1. Guaranteed by design, not tested in production.
2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This
specification does not apply to output voltages below 1.5 V.
3. PG pin floating.
4. Power good is measured as a percentage of the real output voltage value - which includes temperature and process
variation - not the nominal one.
5. 91% or VPG_MIN wichever is higher.
DS13115 - Rev 4
page 6/28
LD49100
Electrical characteristics
Table 6. LD49100 electrical characteristics (fixed version) TJ = 25 °C, VIN = VOUT(NOM) + 1 V,
CIN = COUT = 1 µF, IOUT = 100 mA, VEN = VIN, unless otherwise specified.
Symbol
VI
Parameter
Test conditions
Operating input voltage
IOUT = 10 mA, TJ = 25 °C
VOUT
VOUT accuracy
IOUT = 10 mA
-40 °C < TJ < 125 °C
ISENSE
ISENSE sense pin current
∆VOUT
Static line regulation
Min.
Max.
Unit
1.5
5.5
V
-2.0
2.0
-3.0
3.0
VOUT + 1 V ≤ VIN ≤ 5.5 V
IOUT = 100 mA
∆VIN = 500 mV
∆VOUT
Transient line regulation (1)
Static load regulation
∆VOUT
Transient load regulation (1)
VDROP
Dropout voltage (2)
eN
Output noise voltage
%
2
μA
0.01
%/V
10
IOUT = 100 mA, tR = 5 µs
mVpp
∆VIN = 500 mV
10
IOUT = 100 mA, tF = 5 µs
∆VOUT
Typ.
IOUT = 10 mA to 1 A
0.001
IOUT = 10 mA to 1 A, tR = 5 µs
40
IOUT = 1 A to 10 mA, tF = 5 µs
40
IOUT = 1 A, VOUT > 1.5 V
200
-40 °C < TJ < 125 °C
10 Hz to 100 kHz
%/mA
mVpp
400
µVRMS
85
IOUT = 100 mA, VOUT = 2.5 V
mV
VIN = VOUT(NOM)+0.5 V+/-VRIPPLE
VRIPPLE = 0.1 V
SVR
Supply voltage rejection
frequency = 1 kHz, IOUT = 10 mA
VOUT = 1.5 V
VIN = VOUT(NOM)+0.5 V+/-VRIPPLE
65
dB
VRIPPLE = 0.1 V
62
frequency = 10 kHz, IOUT = 100 mA
IOUT = 0 mA
20
IOUT = 0 mA, -40 °C < TJ < 125 °C
50
IOUT = 0 to 1 A
IQ
Quiescent current
200
IOUT = 0 to 1 A
300
-40 °C < TJ < 125 °C
VIN input current in OFF mode:
0.001
VEN = GND(3)
Power Good output
threshold, rising
-40 °C < TJ < 125 °C
93
99
VPG_OFF (4)
Power Good output
threshold, falling
-40 °C < TJ < 125 °C
91 (5)
95
Minimum Power Good
threshold
-40 °C < TJ < 125 °C
91
Power Good output voltage
low
Isink = 6 mA open drain output
VPG_L
DS13115 - Rev 4
1
VPG_ON (4)
VPG_MIN
µA
%VOUT
%VOUT_
NOM
0.4
V
page 7/28
LD49100
Electrical characteristics
Symbol
ISC
Parameter
Test conditions
Short-circuit current
RL = 0
Enable input logic low
VIN = 1.5 V to 5.5 V
Enable input logic high
-40 °C < TJ < 125 °C
IEN
Enable pin input current
VEN = VIN
tSS
Soft-start time (1)
From enable to 95% of VOUT(NOM)
VEN
TSHDN
COUT
Min.
Typ.
A
0.4
V
0.9
0.5
V
0.1
100
nA
1
1.5
ms
160
Hysteresis
20
Capacitance (see Section 5 )
Unit
2.5
Thermal shutdown
Output capacitor
Max.
°C
1
µF
1. Guaranteed by design, not tested in production.
2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This
specification does not apply to output voltages below 1.5 V.
3. PG pin floating.
4. Power good is measured as a percentage of the real output voltage value - which includes temperature and process
variation - not the nominal one.
5. 91% or VPG_MIN wichever is higher.
DS13115 - Rev 4
page 8/28
LD49100
Typical performance characteristics
5
Typical performance characteristics
CIN = COUT = 1 µF
Figure 5. VOUT accuracy
Figure 4. VADJ accuracy
0.86
VIN = 1.8 V, VEN = IOUT = 10 mA
0.84
VA DJ [V ]
0.82
0.8
0.78
0.76
0.74
-50
-25
0
25
50
75
100
125
150
T [°C ]
Figure 6. Dropout voltage vs. temperature
(VOUT = 2.5 V)
Figure 7. Dropout voltage vs. temperature
(VOUT = 1.5 V)
350
V EN = VIN , IOUT = 1 A
350
250
Dropout [mV ]
Dropout [mV]
400
VEN to VIN, VOUT = 2.5 V, IOUT = 1 A
300
200
150
100
50
300
250
200
150
100
50
0
0
-50
-25
0
25
50
75
100
125
150
--50
--25
0
25
T [°C]
Figure 8. Dropout voltage vs. output current
3.5
VEN to VIN
VOUT = 2.5 V
125
0.1
VIN from 0 to 5.5 V, VEN to VIN, VOUT shorted to GND
125 °C
85 °C
55 °C
25 °C
0 °C
-25 °C
-40 °C
2
1.5
1
0
0.5
0
200
150
2.5
0.15
0.05
400
600
IOUT [mA]
DS13115 - Rev 4
100
3
ISC [A]
Dropout [V]
0.2
75
Figure 9. Short-circuit current vs. drop voltage
0.25
VOUT @ 1.5 V
50
T [°C ]
800
1000
1200
0
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Vdrop [V]
page 9/28
LD49100
Typical performance characteristics
Figure 10. Output voltage vs. input voltage
(VOUT = 0.8 V)
Figure 11. Output voltage vs. input voltage
(VOUT = 2.5 V)
3
1.2
VIN from 0 to 5.5 V, VEN to VIN, VOUT = 0.8 V, IOUT = 1 A
VIN from 0 to 5 V, VEN to VIN, VOUT = 2.5 V, IOUT = 1A
2.5
125°C
2
0.8
VOUT [V]
VOUT [V]
1
125°C
0.6
85°C
55°C
0.4
25°C
0°C
0.2
-40°C
0
0.5
1
1.5
2
2.5
3
3.5
VIN [V]
4
4.5
5
5.5
55°C
25°C
1
0°C
-25°C
0.5
-25°C
0
85°C
1.5
-40°C
0
6
0
180
2.5
3
3.5
4
4.5
5
5.5
6
VIN = 3.5 V, VEN to GND, VOUT = 2.5 V
0.5
140
Iout=1A
No load
0.4
Iq [µA]
120
I q [mA]
2
0.6
160
100
80
VIN = V EN =2.5, Vout = ADJ
0.3
0.2
0.1
40
0
-50
20
-50
1.5
Figure 13. VIN input current in off mode vs.
temperature
200
0
1
VIN [V]
Figure 12. Quiescent current vs. temperature
60
0.5
-30
-10
10
30
50
70
90
110
-25
0
25
50
75
100
125
150
T [°C]
130
TA [°C]
Figure 15. Line regulation VOUT = 0.8 V
Figure 14. Load regulation
0.015
0.04
VIN = 3.5 V, IOUT = from 10 mA to 1 A, VEN=VIN, VOUT = 2.5 V
0.03
0
0
-0.02
-0.01
-0.03
-25
0
25
50
T [°C]
DS13115 - Rev 4
0.01
-0.01
-0.005
-0.015
-50
VIN = from 1.8 V to 5.5 V, IOUT = 100 mA, VEN = VIN, VOUT = 0.8 V
0.02
0.005
Line [%/V]
Load [%/mA]
0.01
75
100
125
150
-0.04
-50
-25
0
25
50
75
100
125
150
T [°C]
page 10/28
LD49100
Typical performance characteristics
Figure 16. Line regulation VOUT = 2.5 V
Figure 17. Supply voltage rejection vs. temperature
(VOUT = 0.8 V)
0.04
100
VIN = from 3.5 V to 5.5 V, IOUT = 100 mA, VEN = VIN, VOUT = 2.5 V
0.03
VIN from 1.7 V to 1.9 V, VEN to VIN, VOUT = 0.8 V
80
0.01
0
SVR [dB]
Line [%/V]
0.02
-0.01
-0.02
-0.03
-0.04
-50
60
40
Freq.10
Freq.10kHz,
kHz,
I IOUT = 100 mA
20
-25
0
25
50
75
100
125
150
Freq.1
Freq.1 kHz,
kHz,I IOUT
OUT = 10 mA
0
-50
T [°C]
-25
0
25
50
75
100
125
150
T [°C]
Figure 18. Supply voltage rejection vs. temperature
(VOUT = 2.5 V)
Figure 19. Supply voltage rejection vs. frequency
(VOUT = 0.8 V)
100
100
VIN from 2.9 V to 3.1 V, VEN to VIN, VOUT = 2.5 V
SVR [dB]
SVR [dB]
IOUT = 10 mA
VIN from 1.55 V to 2.05 V, VEN to VIN, VOUT = 0.8 V
80
80
60
40
Freq. = 10 kHz, IOUT = 100 mA
20
60
40
20
Freq. = 1 kHz, IOUT = 10 mA
0
-50
IOUT = 100 mA
0
-25
0
25
50
75
100
125
0
150
10
20
30
40
50
60
70
80
90
100 110
Freq [kHz]
T [°C]
Figure 20. Supply voltage rejection vs. frequency
(VOUT = 2.5 V)
Figure 21. Output noise voltage vs. frequency
AP - IOUT = 10 0mA
IOUT = 10 mA
VIN from 2.9 V to 3.1 V, VEN to VIN, VOUT = 2.5 V
AP - IOUT = 10 mA
AP - IOUT = 1mA
AP - IOUT = 0A
1.5
1.0
0.5
0.0
1.E+01
0
10
20
30
40
50
60
Freq [kHz]
DS13115 - Rev 4
IOUT = 100 mA
2.0
eN [µV/SQRT(Hz)]
SVR [dB]
2.5
100
90
80
70
60
50
40
30
20
10
0
70
80
90
100 110
1.E+02
1.E+03
1.E+04
1.E+05
f [Hz]
VIN = 1.8 V, VOUT = 0.8 V, VEN = VIN
page 11/28
LD49100
Typical performance characteristics
VEN [V]
Figure 22. Enable voltage vs. temperature
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-50
Figure 23. Line transient
High
High
VIN = 5.5 V IOUT = 100 mA, VOUT = 0 8 V
-25
0
25
50
75
100
Low
Low
125
150
T [°C]
DS13115 - Rev 4
Figure 24. Load transient
Figure 25. Load transient
Figure 26. Load transient
Figure 27. Load transient
page 12/28
LD49100
Typical performance characteristics
Figure 28. Enable transient
DS13115 - Rev 4
page 13/28
LD49100
Application information
6
Application information
The LD49100 is an ultra low-dropout linear regulator. It provides up to 1 A with a low 200 mV dropout. The input
voltage range is from 1.5 V to 5.5 V. The device is available both in fixed and adjustable output versions.
The regulator is equipped with internal protection circuitry, such as short-circuit current limiting and thermal
protection.
Figure 29 and Figure 30 illustrate the typical application schematics:
Figure 29. Typical application circuit for fixed output version
V IN
6
1
C IN
IN
EN
3
PG
VIN
LD49100
VOUT
4
VOUT
OFF ON
GND
5
VSENSE
C OUT
2
Figure 30. Typical application circuit for adjustable version
VIN
6
1
CIN
PG
VIN
EN
LD49100
VOUT
3
OFF ON
GND
2
ADJ
VOUT
4
5
R1
C
O
OUT
R2
Regarding to the adjustable version, the output voltage can be fixed from 0.8 V up to the input voltage, minus the
voltage drop across the pass element (dropout voltage), by connecting a resistor divider between ADJ pin and the
output, thus allowing remote voltage sensing.
DS13115 - Rev 4
page 14/28
LD49100
External capacitors
The resistor divider should be selected as follows:
with
VOUT = VADJ 1 + R1 /R2
(1)
VADJ = 0.8V typ.
(2)
Resistors should be used with values in the range from 10 kΩ to 50 kΩ. Lower values can also be suitable, but
they increase the current consumption.
6.1
External capacitors
The LD49100 voltage regulator requires external low ESR capacitors to assure control loop stability. These
capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance
defined in the following sections.
Input and output capacitors should be located as close as possible to the relevant pins.
6.1.1
Input capacitor
An input capacitor with a minimum value of 1 μF must be located as close as possible to the input pin 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.
A value above 1 µF may be chosen when the application involves fast load transients.
6.1.2
Output capacitor
The LD49100 requires a low-ESR 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 1 µF and equivalent series resistance in the 0 to 150
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.
If the conditions above are met, there is no maximum limit to the output capacitance.
6.2
Output voltage sense pin
In the fixed output voltage version, on pin 5, a VSENSE connection is available. This pin must not be left floating,
since it is necessary for a correct sensing of the output voltage. It can be either connected to the load in a remote
sensing configuration, or directly shorted to the VOUT pin (pin 4, refer to Figure 29. Typical application circuit for
fixed output version.
6.3
Power dissipation
An internal thermal feedback loop disables the output voltage if the die temperature rises to approximately 160
°C. This feature protects the device from excessive temperature and allows the user to push the limits of the
power handling capability of a given circuit board without the risk of damaging the device.
A good PC layout should be used to maximize power dissipation. The thermal path for the heat generated by the
device is from the die to the copper lead frame, through the package leads and exposed pad, to the PCB copper
layer. The PCB copper layer works as a heatsink. The footprint copper pads should be as wide as possible to
spread and dissipate the heat to the surrounding ambient. Feed-through vias to the inner or backside copper
layers are also useful to improve the overall thermal performance of the device.
The device power dissipation depends on the input voltage, output voltage and output current, and is given by:
Junction temperature of the device is:
DS13115 - Rev 4
PD = VIN − VOUT IOUT
(3)
T J_MAX = TA + RtℎJA × PD
(4)
page 15/28
LD49100
Enable function
where:
TJ_MAX is the maximum junction of the die,125 °C
TA is the ambient temperature
RthJA is the thermal resistance junction-to-ambient
Figure 31. Power dissipation vs. ambient temperature
5
4.5
4
3.5
PD [W]
3
2.5
2
1.5
1
0.5
0
-50
-30
-10
10
30
50
70
90
110
130
TA [°C]
6.4
Enable function
The LD49100 features the enable function. When EN voltage is higher than 0.9 V, the device is ON, and if it is
lower than 0.4 V, the device is OFF. In shutdown mode, consumption is lower than 1 μA.
An internal soft-startup circuit helps reducing the in-rush current at turn-on, by providing a typical output voltage
rise-time of 1 ms.
EN pin has not an internal pull-up, so it cannot be left floating if it is not used.
6.5
Power Good function
Some applications require a flag showing that the output voltage is in the correct range.
Power Good threshold depends on the output voltage. When it is higher than VPG-ON, Power Good (PG) pin goes
to high impedance. If it is below VPG-OFF PG pin goes to low impedance. If the device works well, Power Good pin
is at high impedance.
If the device is disabled (EN pin low) the PG signal is set to high impedance. This is done intentionally to avoid
pull-down current by the PG pin in disabled mode.
Power Good function requires an external pull-up resistor, which has to be connected between PG pin and VIN or
VOUT. PG pin typical current capability is up to 6 mA. A pull-up resistor for PG should be in the range from 100 kΩ
to 1 MΩ. If Power Good function is not used, PG pin has to remain floating.
DS13115 - Rev 4
page 16/28
LD49100
Package information
7
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.
DS13115 - Rev 4
page 17/28
LD49100
DFN6 (3x3 mm) automotive-grade package information
7.1
DFN6 (3x3 mm) automotive-grade package information
Figure 32. DFN6 (3x3 mm) automotive-grade package outline
Bottom view
Detail A
Detail A
Top view
DS13115 - Rev 4
DM00169862_1
page 18/28
LD49100
DFN6 (3x3 mm) automotive-grade package information
Table 7. DFN6 (3x3 mm) automotive-grade mechanical data
Dim.
mm
Min.
Typ.
Max.
A
0.80
0.85
0.90
A1
0.0
0.05
b
0.20
0.25
0.30
D
2.95
3.00
3.05
D2
2.30
2.40
2.50
e
0.95
E
2.95
3.00
3.05
E2
1.50
1.60
1.70
L
0.30
0.40
0.50
Figure 33. DFN6 (3x3 mm) automotive-grade recommended footprint
DS13115 - Rev 4
page 19/28
LD49100
DFN6 (3x3 mm) packing information
7.2
DFN6 (3x3 mm) packing information
Figure 34. DFN6 (3x3) tape outline
7875978_N
DS13115 - Rev 4
page 20/28
LD49100
DFN6 (3x3 mm) packing information
Figure 35. DFN6 (3x3 mm) tape oriented
Figure 36. DFN6 (3x3 mm) reel outline
7875978_N
DS13115 - Rev 4
page 21/28
LD49100
DFN6 (3x3 mm) packing information
Table 8. DFN6 (3x3) tape and reel mechanical data
Dim.
DS13115 - Rev 4
mm
Min.
Typ.
Max.
A0
3.20
3.30
3.40
B0
3.20
3.30
3.40
K0
1
1.10
1.20
page 22/28
LD49100
Ordering information
8
Ordering information
Table 9. Order code
DS13115 - Rev 4
Order codes
Output voltages
LD49100PURY
Adjustable
LD49100PU10RY
1.0 V
LD49100PU12RY
1.2 V
LD49100PU15RY
1.5 V
LD49100PU18RY
1.8 V
LD49100PU25RY
2.5 V
LD49100PU30RY
3.0 V
LD49100PU33RY
3.3 V
page 23/28
LD49100
Revision history
Table 10. Document revision history
DS13115 - Rev 4
Date
Revision
Changes
26-Aug-2020
1
Initial release.
01-Sep-2020
2
Change maturity status.
11-Sep-2020
3
Load transient characteristics update in Section 5 Typical
performance characteristics.
18-Feb-2021
4
Added new order codes LD49100PU10RY and LD49100PU15RY in
Table 9. Order code.
page 24/28
LD49100
Contents
Contents
1
Circuit schematics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4
Electrical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
6.1
7
8
External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.1.1
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.1.2
Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2
Output voltage sense pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.4
Enable function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.5
Power Good function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Package information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
7.1
DFN6 (3x3 mm) automotive-grade package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.2
DFN6 (3x3 mm) packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
DS13115 - Rev 4
page 25/28
LD49100
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Pin description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ESD performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
LD49100 electrical characteristics (adjustable version) TJ = 25 °C, VIN = 1.8 V, CIN = COUT = 1 µF, IOUT = 100 mA,
VEN = VIN, unless otherwise specified. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LD49100 electrical characteristics (fixed version) TJ = 25 °C, VIN = VOUT(NOM) + 1 V, CIN = COUT = 1 µF, IOUT = 100
mA, VEN = VIN, unless otherwise specified. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DFN6 (3x3 mm) automotive-grade mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DFN6 (3x3) tape and reel mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
DS13115 - Rev 4
page 26/28
LD49100
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
DS13115 - Rev 4
LD49100 schematic diagram (adjustable version) . . . . . . .
LD49100 schematic diagram (fixed version) . . . . . . . . . . .
Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . .
VADJ accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VOUT accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dropout voltage vs. temperature (VOUT = 2.5 V) . . . . . . . .
Dropout voltage vs. temperature (VOUT = 1.5 V) . . . . . . . .
Dropout voltage vs. output current. . . . . . . . . . . . . . . . . .
Short-circuit current vs. drop voltage . . . . . . . . . . . . . . . .
Output voltage vs. input voltage (VOUT = 0.8 V). . . . . . . . .
Output voltage vs. input voltage (VOUT = 2.5 V). . . . . . . . .
Quiescent current vs. temperature. . . . . . . . . . . . . . . . . .
VIN input current in off mode vs. temperature . . . . . . . . . .
Load regulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line regulation VOUT = 0.8 V . . . . . . . . . . . . . . . . . . . . .
Line regulation VOUT = 2.5 V . . . . . . . . . . . . . . . . . . . . .
Supply voltage rejection vs. temperature (VOUT = 0.8 V) . .
Supply voltage rejection vs. temperature (VOUT = 2.5 V) . .
Supply voltage rejection vs. frequency (VOUT = 0.8 V) . . . .
Supply voltage rejection vs. frequency (VOUT = 2.5 V) . . . .
Output noise voltage vs. frequency . . . . . . . . . . . . . . . . .
Enable voltage vs. temperature. . . . . . . . . . . . . . . . . . . .
Line transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Enable transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical application circuit for fixed output version . . . . . . .
Typical application circuit for adjustable version . . . . . . . .
Power dissipation vs. ambient temperature . . . . . . . . . . .
DFN6 (3x3 mm) automotive-grade package outline . . . . . .
DFN6 (3x3 mm) automotive-grade recommended footprint.
DFN6 (3x3) tape outline. . . . . . . . . . . . . . . . . . . . . . . . .
DFN6 (3x3 mm) tape oriented. . . . . . . . . . . . . . . . . . . . .
DFN6 (3x3 mm) reel outline . . . . . . . . . . . . . . . . . . . . . .
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page 27/28
LD49100
IMPORTANT NOTICE – PLEASE READ CAREFULLY
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DS13115 - Rev 4
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