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PDF NCV4275A Data sheet ( Hoja de datos )
| Número de pieza | NCV4275A | |
| Descripción | Low-Dropout Voltage Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCV4275A
5.0 V, 3.3 V 450 mA
Low-Dropout Voltage
Regulator with Reset
The NCV4275A is an integrated low dropout regulator designed
for use in harsh automotive environments. It includes wide
operating temperature and input voltage ranges. The output is
regulated at 5.0 V or 3.3 V and is rated to 450 mA of output current.
It also provides a number of features, including overcurrent
protection, overtemperature protection and a programmable
microprocessor reset. The NCV4275A is available in the DPAK and
D2PAK surface mount packages. The output is stable over a wide
output capacitance and ESR range. The NCV4275A is pin for pin
compatible with NCV4275.
Features
• 5.0 V and 3.3 V, ±2% Output Voltage Options
• 450 mA Output Current
• Very Low Current Consumption
• Active Reset Output
• Reset Low Down to VQ = 1.0 V
• 500 mV (max) Dropout Voltage
• Fault Protection
♦ +45 V Peak Transient Voltage
♦ −42 V Reverse Voltage
♦ Short Circuit Protection
♦ Thermal Overload Protection
• AEC−Q100 Grade 1 Qualified and PPAP Capable
• Pin Compatible with NCV4275
• These are Pb−Free Devices
Applications
• Auto Body Electronics
IQ
Bandgap
Reference
Thermal
Shutdown
D
Error
Amplifier
+
−
Current Limit and
Saturation Sense
Reset
Generator
1
5
www.onsemi.com
MARKING
DIAGRAMS
DPAK, 5−PIN
DT SUFFIX
CASE 175AA
4275AxG
ALYWW
1
1
5
D2PAK, 5−PIN
DS SUFFIX
CASE 936A
NC
V4275Ax
AWLYWWG
1
x
A
WL, L
Y
WW
G
= 5 (5.0 V Output)
or 3 (3.3 V Output)
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
Pin 1. I
2. RO
Tab, 3. GND*
4. D
5. Q
* Tab is connected to
Pin 3 on all packages
ORDERING INFORMATION
See detailed ordering and shipping information in the
dimensions section on page 17 of this data sheet.
Figure 1. Block Diagram
© Semiconductor Components Industries, LLC, 2014
October, 2014 − Rev. 4
GND
RO
1
Publication Order Number:
NCV4275A/D
1 page  
NCV4275A
TYPICAL PERFORMANCE CHARACTERISTICS
5.0 V Version
10
3.3 V Version
10
Stable ESR Region
1
CQ = 22 mF
0.1
0.01
0
100
VQ(nom) = 5.0 V
100 200 300
IQ, OUTPUT CURRENT (mA)
400
Figure 2. Output Stability with Output
Capacitor ESR
Stable ESR Region
1
CQ = 22 mF
0.1
0.01
0
100
VQ(nom) = 3.3 V
100 200 300
IQ, OUTPUT CURRENT (mA)
400
Figure 3. Output Stability with Output
Capacitor ESR
10
1
0.1
0.01
0
5.2
Stable ESR Region
CQ = 1 mF
VQ(nom) = 5.0 V
100 200 300 400
IQ, OUTPUT CURRENT (mA)
Figure 4. Output Stability with Output
Capacitor ESR
5.1 VI = 13.5 V, RL = 25 W
10
Stable ESR Region
1
CQ = 1 mF
0.1
0
3.5
VQ(nom) = 3.3 V
100 200 300 400
IQ, OUTPUT CURRENT (mA)
Figure 5. Output Stability with Output
Capacitor ESR
3.4 VI = 13.5 V, RL = 16.5 W
5.0 3.3
4.9
4.8
−40
VQ(nom) = 5.0 V
0 40 80 120
TJ, JUNCTION TEMPERATURE (°C)
160
Figure 6. Output Voltage VQ vs. Temperature TJ
3.2
VQ(nom) = 3.3 V
3.1
−40
0 40 80 120
TJ, JUNCTION TEMPERATURE (°C)
160
Figure 7. Output Voltage VQ vs. Temperature TJ
www.onsemi.com
5
5 Page 
NCV4275A
Calculating Power Dissipation
in a Single Output Linear Regulator
The maximum power dissipation for a single output
regulator (Figure 25) is:
PD(max) + [VI(max) * VQ(min)] IQ(max)
(1)
) VI(max)Iq
where
VI(max)
is the maximum input
voltage,
VQ(min)
voltage,
is the minimum output
IQ(max)
is the maximum output
current for the application,
Iq is the quiescent current the regulator consumes
at IQ(max).
Once the value of PD(max) is known, the maximum
permissible value of RqJA can be calculated:
RqJA
+
150° C *
PD
TA
(2)
The value of RqJA can then be compared with those in the
package section of the data sheet. Those packages with
RqJA’s less than the calculated value in Equation 2 will keep
the die temperature below 150°C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
II
VI
SMART
REGULATOR®
} Control
Features
Iq
IQ
VQ
Heatsinks
A heatsink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and
the outside environment will have a thermal resistance.
Like series electrical resistances, these resistances are
summed to determine the value of RqJA:
RqJA + RqJC ) RqCS ) RqSA
(3)
where
RqJC is the junction−to−case thermal resistance,
RqCS is the case−to−heatsink thermal resistance,
RqSA is the heatsink−to−ambient thermal resistance.
RqJC appears in the package section of the data sheet.
Like RqJA, it too is a function of package type. RqCS and
RqSA are functions of the package type, heatsink and the
interface between them. These values appear in heatsink
data sheets of heatsink manufacturers.
Thermal, mounting, and heatsinking considerations are
discussed in the ON Semiconductor application note
AN1040/D.
Thermal Model
Figure 25. Single Output Regulator with Key
Performance Parameters Labeled
A discussion of thermal modeling is in the ON Semiconductor web site: http://www.onsemi.com/pub/collateral/BR1487−D.PDF.
Table 1. DPAK 5−Lead Thermal RC Network Models
Drain Copper Area (1 oz thick)
168 mm2
736 mm2
(SPICE Deck Format)
Cauer Network
168 mm2
736 mm2
Units
168 mm2
736 mm2
Foster Network
Tau Tau
Units
C_C1 Junction Gnd
1.00E−06
1.00E−06
W−s/C
1.36E−08
1.361E−08
sec
C_C2 node1
Gnd
1.00E−05
1.00E−05
W−s/C
7.41E−07
7.411E−07
sec
C_C3 node2
Gnd
6.00E−05
6.00E−05
W−s/C
1.04E−05
1.029E−05
sec
C_C4 node3
Gnd
1.00E−04
1.00E−04
W−s/C
3.91E−05
3.737E−05
sec
C_C5 node4
Gnd
4.36E−04
3.64E−04
W−s/C
1.80E−03
1.376E−03
sec
C_C6 node5
Gnd
6.77E−02
1.92E−02
W−s/C
3.77E−01
2.851E−02
sec
C_C7 node6
Gnd
1.51E−01
1.27E−01
W−s/C
3.79E+00
9.475E−01
sec
C_C8 node7
Gnd
4.80E−01
1.018
W−s/C
2.65E+01
1.173E+01
sec
C_C9 node8
Gnd
3.740
2.955
W−s/C
8.71E+01
8.59E+01
sec
www.onsemi.com
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet NCV4275A.PDF ] | |
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