NCP148AFCT180T2G [ONSEMI]
Ultra-Low Noise High PSRR LDO Regulator Analog Circuits;
| 型号： | NCP148AFCT180T2G |
| 厂家： | 
ONSEMI |
| 描述： | Ultra-Low Noise High PSRR LDO Regulator Analog Circuits |
| 文件： | 总12页 (文件大小：578K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NCP148
450 mA, Ultra-Low Noise
and High PSRR LDO
Regulator for RF and
Analog Circuits
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The NCP148 is a linear regulator capable of supplying 450 mA
output current. Designed to meet the requirements of RF and analog
circuits, the NCP148 device provides low noise, high PSRR, low
quiescent current, and very good load/line transients. The NCP148
offers soft−start function with optimized slew rate control to use in
camera module. The device is designed to work with a 1 mF input and a
1 mF output ceramic capacitor. It is available in ultra−small 0.35P,
0.65 mm x 0.65 mm Chip Scale Package (CSP).
MARKING
DIAGRAMS
X
WLCSP4
CASE 567JZ
A1
X or XX = Specific Device Code
Features
M
= Date Code
• Operating Input Voltage Range: 1.9 V to 5.5 V
• Available in Fixed Voltage Option: 1.8 V to 5.14 V
• Optimized Start−up Slew Rate for Camera Sensor
PIN CONNECTIONS
•
2% Accuracy Over Load/Temperature
• Low Quiescent Current Typ. 55 mA
• Standby Current: Typ. 0.1 mA
• Very Low Dropout: 150 mV at 450 mA
• Ultra High PSRR: Typ. 98 dB at 20 mA, f = 1 kHz
IN
OUT
A2
A1
B1
B2
• Ultra Low Noise: 10 mV
RMS
• Stable with a 1 mF Small Case Size Ceramic Capacitors
EN
GND
• Available in WLCSP4 0.65 mm x 0.65 mm x 0.33 mm CASE 567JZ
(Top View)
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
ORDERING INFORMATION
See detailed ordering and shipping information on page 11 of
this data sheet.
Typical Applications
• Camera Modules
• Battery−powered Equipment
• Smartphones, Tablets
• Cameras, DVRs, STB and Camcorders
V
V
OUT
IN
IN
OUT
NCP148
GND
C
1 mF
Ceramic
EN
IN
C
OUT
1 mF
Ceramic
ON
OFF
Figure 1. Typical Application Schematics
© Semiconductor Components Industries, LLC, 2017
1
Publication Order Number:
June, 2017 − Rev. 0
NCP148/D
NCP148
IN
ENABLE
LOGIC
THERMAL
EN
SHUTDOWN
BANDGAP
MOSFET
REFERENCE
INTEGRATED
SOFT−START
DRIVER WITH
CURRENT LIMIT
OUT
* ACTIVE DISCHARGE
Version A only
EN
GND
Figure 2. Simplified Schematic Block Diagram
Description
PIN FUNCTION DESCRIPTION
Pin No.
A1
Pin Name
IN
Input voltage supply pin
Regulated output voltage. The output should be bypassed with small 1 mF ceramic capacitor.
A2
OUT
EN
B1
Chip enable: Applying V < 0.4 V disables the regulator, Pulling V > 1.2 V enables the LDO.
EN EN
B2
GND
EPAD
Common ground connection
−
Expose pad should be tied to ground plane for better power dissipation
ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
V
Input Voltage (Note 1)
V
IN
−0.3 V to 6
Output Voltage
V
OUT
−0.3 to V + 0.3, max. 6 V
V
IN
Chip Enable Input
V
CE
−0.3 to V + 0.3, max. 6 V
V
IN
Output Short Circuit Duration
Maximum Junction Temperature
Storage Temperature
t
unlimited
150
s
SC
T
°C
°C
V
J
T
STG
−55 to 150
2000
ESD Capability, Human Body Model (Note 2)
ESD Capability, Machine Model (Note 2)
ESD
HBM
ESD
200
V
MM
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. Refer to ELECTRICAL CHARACTERISTIS and APPLICATION INFORMATION for Safe Operating Area.
2. This device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per EIA/JESD22−A114
ESD Machine Model tested per EIA/JESD22−A115
Latchup Current Maximum Rating tested per JEDEC standard: JESD78.
THERMAL CHARACTERISTICS
Rating
Symbol
Value
Unit
Thermal Characteristics, CSP4 (Note 3)
R
108
°C/W
q
JA
Thermal Resistance, Junction−to−Air
3. Measured according to JEDEC board specification. Detailed description of the board can be found in JESD51−7
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2
NCP148
ELECTRICAL CHARACTERISTICS −40°C ≤ T ≤ 125°C; V = V
+ 1 V; I
= 1 mA, C = C
= 1 mF, unless otherwise
J
IN
OUT(NOM)
OUT
IN
OUT
noted. V = 1.2 V. Typical values are at T = +25°C (Note 4).
EN
J
Parameter
Test Conditions
Symbol
Min
Typ
Max
Unit
Operating Input Voltage
Output Voltage Accuracy
V
1.9
5.5
V
IN
V
= V
+ 1 V
≤ 450 mA
IN
OUT(NOM)
OUT
V
OUT
−2
+2
%
0 mA ≤ I
Line Regulation
V
+ 1 V ≤ V ≤ 5.5 V
Line
Reg
0.02
0.001
300
190
180
175
700
690
55
%/V
OUT(NOM)
IN
Load Regulation
I
= 1 mA to 450 mA
Load
%/mA
OUT
Reg
Dropout Voltage (Note 5)
I
= 450 mA
V
V
V
V
= 1.8 V
= 2.5 V
= 2.7 V
= 2.8 V
450
315
300
290
OUT
OUT(NOM)
OUT(NOM)
OUT(NOM)
OUT(NOM)
V
DO
mV
Output Current Limit
Short Circuit Current
Quiescent Current
V
V
= 90% V
I
CL
450
1.2
OUT
OUT(NOM)
mA
V
= 0 V
I
OUT
SC
I
= 0 mA
I
Q
65
1
mA
mA
OUT
Shutdown Current
≤ 0.4 V, V = 4.8 V
I
0.01
EN
IN
DIS
EN Pin Threshold Voltage
EN Input Voltage “H”
EN Input Voltage “L”
V
ENH
V
V
ENL
0.4
0.5
EN Pull Down Current
V
= 4.8 V
I
0.2
mA
EN
EN
Power Supply Rejection Ratio
I
= 20 mA
f = 100 Hz
91
98
82
48
OUT
f = 1 kHz
f = 10 kHz
f = 100 kHz
PSRR
dB
Output Voltage Noise
f = 10 Hz to 100 kHz
I
= 1 mA
= 250 mA
14
10
OUT
V
N
mV
RMS
I
OUT
Thermal Shutdown Threshold
Temperature rising
Temperature falling
T
160
140
280
°C
°C
W
SDH
T
SDL
Active output discharge resistance
Line transient (Note 6)
V
< 0.4 V, Version A only
R
DIS
EN
V
IN
= (V
+ 1 V) to (V
+
OUT(NOM)
OUT(NOM)
−1
1.6 V) in 30 ms, I
= 1 mA
OUT
Tran
mV
mV
LINE
V
IN
= (V
+ 1.6 V) to (V
+
OUT(NOM)
OUT(NOM)
+1
1 V) in 30 ms, I
= 1 mA
OUT
Load transient (Note 6)
−40
I
= 1 mA to 450 mA in 10 ms
= 450 mA to 1mA in 10 ms
OUT
Tran
LOAD
I
+40
OUT
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
4. Performance guaranteed over the indicated operating temperature range by design and/or characterization. Production tested at T = 25°C.
A
Low duty cycle pulse techniques are used during the testing to maintain the junction temperature as close to ambient as possible.
5. Dropout voltage is characterized when V
6. Guaranteed by design.
falls 100 mV below V
.
OUT
OUT(NOM)
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3
NCP148
TYPICAL CHARACTERISTICS
1.820
1.815
1.810
1.805
1.800
1.795
1.790
1.785
1.780
2.830
2.825
2.820
2.815
I
I
= 10 mA
OUT
I
= 10 mA
= 450 mA
OUT
OUT
2.810
2.805
I
= 450 mA
OUT
V
V
C
C
= 3.8 V
V
V
C
C
= 2.8 V
IN
IN
2.800
2.795
2.790
= 2.8 V
= 1 mF
= 1.8 V
= 1 mF
OUT
OUT
IN
IN
= 1 mF
= 1 mF
OUT
OUT
−40 −20
0
20
40
60
80 100 120 140
−40 −20
0
20
40
60
80
100 120 140
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 3. Output Voltage vs. Temperature −
OUT = 1.8 V
Figure 4. Output Voltage vs. Temperature −
OUT = 2.8 V
V
V
0.010
0.009
0.008
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0
0.010
0.009
0.008
0.007
0.006
0.005
0.004
0.003
0.002
0.001
0
V
V
C
C
= 4.3 V
IN
= 3.3 V
= 1 mF
OUT
IN
= 1 mF
OUT
V
V
C
C
= 2.8 V
IN
= 1.8 V
= 1 mF
OUT
IN
= 1 mF
OUT
−40 −20
0
20
40
60
80
100 120 140
−40 −20
0
20
40
60
80
100 120 140
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 5. Line Regulation vs. Temperature −
OUT = 1.8 V
Figure 6. Line Regulation vs. Temperature −
VOUT = 2.8 V
V
8
7
6
5
4
3
2
1
0
8
7
6
5
4
3
2
1
0
V
V
C
C
= 2.8 V
V
V
C
C
= 3.8 V
IN
IN
= 1.8 V
= 1 mF
= 2.8 V
= 1 mF
OUT
OUT
IN
IN
= 1 mF
= 1 mF
OUT
OUT
−40 −20
0
20
40
60
80 100 120 140
−40 −20
0
20
40
60
80 100 120 140
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 7. Load Regulation vs. Temperature −
OUT = 1.8 V
Figure 8. Load Regulation vs. Temperature −
VOUT = 2.8 V
V
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NCP148
TYPICAL CHARACTERISTICS
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.6
1.4
T = 125°C
T = 125°C
J
J
1.2
T = 25°C
J
T = 25°C
J
1.0
0.8
T = −40°C
J
T = −40°C
J
0.6
V
V
C
C
= 2.8 V
V
V
C
C
= 3.7 V
IN
IN
0.4
0.2
0.0
= 1.8 V
= 1 mF
= 2.7 V
= 1 mF
OUT
OUT
IN
IN
= 1 mF
= 1 mF
OUT
OUT
0
50 100 150 200 250 300 350 400 450
0
50 100 150 200 250 300 350 400 450
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 9. Ground Current vs. Load Current −
Figure 10. Ground Current vs. Load Current −
V
OUT = 1.8 V
VOUT = 2.7 V
400
350
300
250
200
150
240
210
180
150
120
90
V
C
C
= 1.8 V
= 1 mF
= 1 mF
V
C
C
= 3.3 V
= 1 mF
= 1 mF
OUT
OUT
T = 125°C
T = 125°C
J
J
IN
IN
OUT
OUT
T = 25°C
J
T = 25°C
J
T = −40°C
J
T = −40°C
J
100
50
0
60
30
0
0
50 100 150 200 250 300 350 400 450
, OUTPUT CURRENT (mA)
0
50 100 150 200 250 300 350 400 450
, OUTPUT CURRENT (mA)
I
I
OUT
OUT
Figure 11. Dropout Voltage vs. Load Current −
OUT = 1.8 V
Figure 12. Dropout Voltage vs. Load Current −
VOUT = 2.8 V
V
240
400
360
320
V
C
C
= 1.8 V
= 1 mF
= 1 mF
OUT
I
= 450 mA
V
OUT
= 2.8V
I
= 450 mA
OUT
OUT
210
180
150
120
IN
C
C
= 1 mF
IN
OUT
= 1 mF
OUT
280
240
200
160
120
80
90
60
I
= 0 mA
OUT
I
= 0 mA
OUT
30
0
40
0
−40 −20
0
20
40
60
80 100 120 140
−40 −20
0
20
40
60
80 100 120 140
T , JUNCTION TEMPERATURE (°C)
J
Figure 13. Dropout Voltage vs. Temperature −
OUT = 1.8 V
Figure 14. Dropout Voltage vs. Temperature −
VOUT = 2.8 V
V
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NCP148
TYPICAL CHARACTERISTICS
750
740
730
720
710
700
690
680
670
660
700
690
650
640
680
670
630
V
V
C
C
= 3.8 V
V
V
C
C
= 3.8 V
= 0 V
(SHORT)
IN
IN
= 90% V
620
610
600
OUT
OUT(nom)
OUT
= 1 mF
= 1 mF
IN
IN
OUT
660
650
= 1 mF
= 1 mF
OUT
−40 −20
0
20
40
60
80 100 120 140
−40 −20
0
20
40
60
80 100 120 140
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 15. Current Limit vs. Temperature
Figure 16. Short Circuit Current vs.
Temperature
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
OFF −> ON
ON −> OFF
V
V
C
C
= 3.8 V
V
V
C
C
= 3.8 V
IN
IN
= 2.8 V
= 2.8 V
= 1 mF
OUT
OUT
= 1 mF
IN
IN
= 1 mF
= 1 mF
OUT
OUT
−40 −20
0
20
40
60
80 100 120 140
−40 −20
0
20
40
60
80
100 120 140
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 17. Enable Threshold Voltage vs.
Temperature
Figure 18. Enable Current vs. Temperature
100
90
80
70
60
50
40
30
20
10
0
300
290
280
270
260
250
240
230
220
210
200
V
V
C
C
= 2.8 V
IN
= 1.8 V
= 1 mF
OUT
IN
= 1 mF
OUT
V
V
C
C
= 3.8 V
IN
= 2.8 V
= 1 mF
OUT
IN
= 1 mF
OUT
−40 −20
0
20
40
60
80
100 120 140
−40 −20
0
20
40
60
80
100 120 140
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 19. Disable Current vs. Temperature
Figure 20. Discharge Resistivity vs.
Temperature
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NCP148
TYPICAL CHARACTERISTICS
10K
1K
I
= 450 mA
OUT
I
= 250 mA
OUT
RMS Output Noise (mV)
10 Hz − 100 kHz 100 Hz − 100 kHz
14.62 14.10
I
= 10 mA
OUT
I
OUT
I
= 1 mA
OUT
1 mA
10 mA
250 mA
450 mA
100
11.12
10.37
10.22
10.48
9.82
9.62
V
V
C
C
= 2.8 V
IN
10
1
= 1.8 V
= 1 mF MLCC (1206)
= 1 mF MLCC (1206)
OUT
IN
OUT
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
Figure 21. Output Voltage Noise Spectral Density − VOUT = 1.8 V
10K
1K
I
= 450 mA
OUT
I
= 250 mA
OUT
RMS Output Noise (mV)
I
= 10 mA
OUT
I
10 Hz − 100 kHz
16.90
100 Hz − 100 kHz
15.79
I
= 1 mA
OUT
OUT
1 mA
10 mA
250 mA
450 mA
100
12.64
11.96
11.50
11.13
10.64
10.40
V
V
C
C
= 3.8 V
IN
10
1
= 2.8 V
OUT
= 1 mF MLCC (1206)
IN
= 1 mF MLCC (1206)
OUT
10
100
1K
10K
100K
1M
FREQUENCY (kHz)
Figure 22. Output Voltage Noise Spectral Density − VOUT = 2.8 V
120
100
80
120
V
V
C
= 2.3 V+100mVpp
= 1.8 V
I
= 10 mA
I
= 10 mA
IN
OUT
OUT
V
V
C
= 3.8 V+100mVpp
= 2.8 V
IN
I
= 20 mA
I
= 20 mA
OUT
OUT
OUT
OUT
100
80
= 1 mF MLCC 1206
OUT
= 1 mF MLCC 1206
OUT
60
60
I
= 100 mA
OUT
I
= 100 mA
OUT
40
40
I
= 250 mA
OUT
I
= 250 mA
OUT
20
0
20
0
I
= 450 mA
0.1
I
= 450 mA
0.1
OUT
OUT
0.01
1
10
100
1000
10000
0.01
1
10
100
1000 10000
FREQUENCY (kHz)
FREQUENCY (kHz)
Figure 23. PSRR for Various Output Currents,
OUT = 1.8 V
Figure 24. PSRR for Various Output Currents,
VOUT = 2.8 V
V
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NCP148
TYPICAL CHARACTERISTICS
100
10
V
IN
Unstable
Operation
V
OUT
1
Stable
Operation
0.1
0
50 100 150 200 250 300 350 400 450 500
, OUTPUT CURRENT (mA)
4 ms/div
I
OUT
Figure 25. Stability vs. ESR
Figure 26. Turn−on/off − slow rising VIN
V
EN
V
EN
I
INPUT
V
V
C
C
= 3.7 V
IN
= 2.7 V
OUT
V
OUT
= 1 mF (MLCC)
IN
V
V
C
C
= 3.7 V
IN
= 1 mF (MLCC)
OUT
= 2.7 V
OUT
V
OUT
= 1 mF (MLCC)
I
IN
INPUT
= 1 mF (MLCC)
OUT
100 ms/div
100 ms/div
Figure 27. Enable Turn−on Response −
Figure 28. Enable Turn−on Response −
C
OUT = 1 mF, IOUT = 10 mA
COUT = 1 mF, IOUT = 450 mA
4.8 V
3.8 V
V
IN
3.8 V
V
IN
2.8 V
V
OUT
V
OUT
V
C
= 2.8 V, I
= 1 mF (MLCC), C
= 10 mA
OUT
OUT
V
C
= 1.8 V, I
= 1 mF (MLCC), C
= 10 mA
OUT
OUT
= 1 mF (MLCC)
IN
OUT
= 1 mF (MLCC)
IN
OUT
20 ms/div
20 ms/div
Figure 29. Line Transient Response −
VOUT = 1.8 V
Figure 30. Line Transient Response −
VOUT = 2.8 V
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NCP148
TYPICAL CHARACTERISTICS
I
OUT
t
= 1 ms
FALL
t
= 1 ms
RISE
I
OUT
V
OUT
V
OUT
V
V
= 2.8 V
V
= 2.8 V
= 1.8 V
IN
IN
= 1.8 V
V
OUT
OUT
C
C
= 1 mF (MLCC)
C
C
= 1 mF (MLCC)
IN
IN
= 1 mF (MLCC)
= 1 mF (MLCC)
OUT
OUT
2 ms/div
20 ms/div
Figure 31. Load Transient Response −
1 mA to 450 mA − VOUT = 1.8 V
Figure 32. Load Transient Response −
450 mA to 1 mA − VOUT = 1.8 V
I
OUT
t
= 1 ms
FALL
t
= 1 ms
RISE
I
OUT
V
OUT
V
OUT
V
IN
= 3.7 V
V
IN
= 3.7 V
V
OUT
= 2.7 V
V
OUT
= 2.7 V
C
C
= 1 mF (MLCC)
C
C
= 1 mF (MLCC)
IN
IN
= 1 mF (MLCC)
= 1 mF (MLCC)
OUT
OUT
5 ms/div
20 ms/div
Figure 33. Load Transient Response −
1 mA to 450 mA − VOUT = 2.7 V
Figure 34. Load Transient Response −
450 mA to 1 mA − VOUT = 2.7 V
V
IN
= 5.5 V, V
= 3.3 V
V
EN
OUT
Short Circuit Event
C
C
= 1 mF (MLCC)
IN
= 1 mF (MLCC)
OUT
I
OUT
V
OUT
V
OUT
V
V
C
= 3.8 V
IN
C
= 4.7 mF
Thermal
Shutdown
OUT
Overheating
10 ms/div
TSD cycling
= 2.8 V
OUT
= 1 mF (MLCC)
IN
C
= 1 mF
OUT
400 ms/div
Figure 35. Short Circuit and Thermal
Shutdown
Figure 36. Enable Turn−Off (Active Discharge)
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NCP148
APPLICATIONS INFORMATION
General
transient response or high frequency PSRR. It is not
The NCP148 is an ultra−low noise 450 mA low dropout
recommended to use tantalum capacitors on the output due
to their large ESR. The equivalent series resistance of
tantalum capacitors is also strongly dependent on the
temperature, increasing at low temperature.
regulator designed to meet the requirements of RF
applications and high performance analog circuits. The
NCP148 device provides very high PSRR and excellent
dynamic response. In connection with low quiescent current
this device is well suitable for battery powered application
such as cell phones, tablets and other. The NCP148 is fully
protected in case of current overload, output short circuit and
overheating.
Enable Operation
The NCP148 uses the EN pin to enable/disable its device
and to deactivate/activate the active discharge function.
If the EN pin voltage is <0.4 V the device is guaranteed to
be disabled. The pass transistor is turned−off so that there is
virtually no current flow between the IN and OUT. The
active discharge transistor is active so that the output voltage
Input Capacitor Selection (CIN)
Input capacitor connected as close as possible is necessary
for ensure device stability. The X7R or X5R capacitor
should be used for reliable performance over temperature
range. The value of the input capacitor should be 1 mF or
greater to ensure the best dynamic performance. This
capacitor will provide a low impedance path for unwanted
AC signals or noise modulated onto constant input voltage.
There is no requirement for the ESR of the input capacitor
but it is recommended to use ceramiccapacitors for their low
ESR and ESL. A good input capacitor will limit the
influence of input trace inductance and source resistance
during sudden load current changes.
V
OUT
is pulled to GND through a 280 Ω resistor. In the
disable state the device consumes as low as typ. 10 nA from
the V .
IN
If the EN pin voltage >1.2 V the device is guaranteed to
be enabled. The NCP148 regulates the output voltage and
the active discharge transistor is turned−off.
The EN pin has internal pull−down current source with
typ. value of 200 nA which assures that the device is
turned−off when the EN pin is not connected. In the case
where the EN function isn’t required the EN should be tied
directly to IN. After device is enabled by EN pin soft start
feature ensure that maximal Vout slew rate will be slower
than 30 mV/ms. The soft start function also protects powered
device before possible damage by large inrush current.
Output Decoupling (COUT
)
The NCP148 requires an output capacitor connected as
close as possible to the output pin of the regulator. The
recommended capacitor value is 1 mF and X7R or X5R
dielectric due to its low capacitance variations over the
specified temperature range. The NCP148 is designed to
remain stable with minimum effective capacitance of 0.7 mF
to account for changes with temperature, DC bias and
package size. Especially for small package size capacitors
such as 0201 the effective capacitance drops rapidly with the
applied DC bias. Please refer Figure 37.
Output Current Limit
Output Current is internally limited within the IC to a
typical 700 mA. The NCP148 will source this amount of
current measured with a voltage drops on the 90% of the
nominal V
. If the Output Voltage is directly shorted to
= 0 V), the short circuit protection will limit
OUT
ground (V
OUT
the output current to 690 mA (typ). The current limit and
short circuit protection will work properly over whole
temperature range and also input voltage range. There is no
limitation for the short circuit duration.
Thermal Shutdown
When the die temperature exceeds the Thermal Shutdown
threshold (T * 160°C typical), Thermal Shutdown event
SD
is detected and the device is disabled. The IC will remain in
this state until the die temperature decreases below the
Thermal Shutdown Reset threshold (T
− 140°C typical).
SDU
Once the IC temperature falls below the 140°C the LDO is
enabled again. The thermal shutdown feature provides the
protection from a catastrophic device failure due to
accidental overheating. This protection is not intended to be
used as a substitute for proper heat sinking.
Figure 37. Capacity vs DC Bias Voltage
Power Dissipation
There is no requirement for the minimum value of
As power dissipated in the NCP148 increases, it might
become necessary to provide some thermal relief. The
maximum power dissipation supported by the device is
dependent upon board design and layout. Mounting pad
Equivalent Series Resistance (ESR) for the C
but the
OUT
maximum value of ESR should be less than 2 Ω. Larger
output capacitors and lower ESR could improve the load
www.onsemi.com
10
NCP148
configuration on the PCB, the board material, and the
ambient temperature affect the rate of junction temperature
rise for the part.
The power dissipated by the NCP148 for given
application conditions can be calculated from the following
equations:
The maximum power dissipation the NCP148 can handle
is given by:
ǒ
Ǔ
(eq. 2)
PD [ VIN @ IGND ) IOUT VIN * VOUT
o
ƪ
ƫ
125 C * TA
PD(MAX)
+
(eq. 1)
qJA
160
150
140
130
120
110
100
90
1.6
P
P
, T = 25°C, 2 oz Cu
D(MAX)
A
1.4
, T = 25°C, 1 oz Cu
1.2
1.0
0.8
0.6
0.4
D(MAX)
A
q
, 1 oz Cu
JA
JA
q
, 2 oz Cu
500
0.2
0
80
0
100
200
300
400
600
700
2
PCB COPPER AREA (mm )
Figure 38. qJA and PD (MAX) vs. Copper Area (CSP4)
Reverse Current
PCB Layout Recommendations
The PMOS pass transistor has an inherent body diode
which will be forward biased in the case that V > V .
To obtain good transient performance and good regulation
characteristics place C and C capacitors close to the
OUT
IN
IN
OUT
Due to this fact in cases, where the extended reverse current
condition can be anticipated the device may require
additional external protection.
device pins and make the PCB traces wide. In order to
minimize the solution size, use 0402 or 0201 capacitors with
appropriate capacity. Larger copper area connected to the
pins will also improve the device thermal resistance. The
actual power dissipation can be calculated from the equation
above (Equation 2). Expose pad can be tied to the GND pin
for improvement power dissipation and lower device
temperature.
Power Supply Rejection Ratio
The NCP148 features very high Power Supply Rejection
ratio. If desired the PSRR at higher frequencies in the range
100 kHz – 10 MHz can be tuned by the selection of C
capacitor and proper PCB layout.
OUT
ORDERING INFORMATION
Device
Nominal Output Voltage
Description
Marking
Rotation
270°
0°
Package
Shipping
NCP148AFCT180T2G
NCP148AFCT250T2G
NCP148AFCT255T2G
NCP148AFCT260T2G
NCP148AFCT270T2G
NCP148AFCT280T2G
1.8 V
2.5 V
2.55 V
2.6 V
2.7 V
2.8 V
T
V
4
5000 /
Tape &
Reel
180°
90°
450 mA, Active
Discharge
567JZ
V
Y
6
0°
0°
www.onsemi.com
11
NCP148
PACKAGE DIMENSIONS
WLCSP4, 0.64x0.64
CASE 567JZ
ISSUE A
NOTES:
A
E
B
D
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. COPLANARITY APPLIES TO SPHERICAL
CROWNS OF SOLDER BALLS.
PIN A1
REFERENCE
MILLIMETERS
DIM
A
A1
A2
b
MIN
−−−
0.04
NOM
−−−
0.06
0.23 REF
0.210
0.640
MAX
0.33
0.08
TOP VIEW
0.195
0.610
0.610
0.225
0.670
0.670
A2
D
E
0.640
0.05
C
e
0.35 BSC
A
0.05
C
RECOMMENDED
A1
SEATING
PLANE
SOLDERING FOOTPRINT*
NOTE 3
C
SIDE VIEW
PACKAGE
A1
OUTLINE
e
4X
b
4X0.20
e
0.35
PITCH
0.03
C A B
B
0.35
PITCH
A
DIMENSIONS: MILLIMETERS
1
2
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
BOTTOM VIEW
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