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PDF NCP1086 Data sheet ( Hoja de datos )
| Número de pieza | NCP1086 | |
| Descripción | 1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator | |
| Fabricantes | ON | |
| Logotipo |  |
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NCP1086
1.5 A Adjustable and 3.3 V
Fixed Output Linear
Regulator
The NCP1086 linear regulator provides 1.5 A at 3.3 V or adjustable
output voltage. The adjustable output voltage device uses two external
resistors to set the output voltage within a 1.25 V to 5.5 V range.
The regulators is intended for use as post regulator and
microprocessor supply. The fast loop response and low dropout
voltage make this regulator ideal for applications where low voltage
operation and good transient response are important.
The circuit is designed to operate with dropout voltages less than
1.4 V at 1.5 A output current. Device protection includes overcurrent
and thermal shutdown.
This device is pin compatible with LT1086 family of linear
regulators and has lower dropout voltage.
The regulators are available in TO−220−3, surface mount
D2PAK−3, and SOT−223 packages.
Features
• Output Current to 1.5 A
• Output Accuracy to ±1% Over Temperature
• Dropout Voltage (typical) 1.05 V @ 1.5 A
• Fast Transient Response
• Fault Protection Circuitry
♦ Current Limit
♦ Thermal Shutdown
• Pb−Free Packages are Available*
http://onsemi.com
12 3
123
12 3
TO−220−3
T SUFFIX
CASE 221A
Adjustable
Output
Tab = VOUT
Pin 1. Adj
2. VOUT
3. VIN
D2PAK−3
DP SUFFIX
CASE 418AB
SOT−223
ST SUFFIX
CASE 318E
3.3 V Fixed
Output
Tab = VOUT
Pin 1. GND
2. VOUT
3. VIN
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 10 of this data sheet.
5.0 V
VIN VOUT
NCP1086
Adj
10 mF
5.0 V
0.1 mF
5.0 V
Tantalum
3.3 V
@ 1.5 A
124 W
1.0%
200 W
1.0%
22 mF
5.0 V
VIN VOUT
NCP1086
GND
10 mF
5.0 V
3.3 V
@ 1.5 A
22 mF
5.0 V
Figure 1. Application Diagram, Adjustable Output
Figure 2. Application Diagram, 3.3 V Fixed Output
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2004
July, 2004 − Rev. 4
1
Publication Order Number:
NCP1086/D
1 page  
NCP1086
85
75
65
55
45 TCASE = 25°C
35
IOUT = 6A
(VIN − VOUT = 3V)
25
VRIPPLE = 1.6VPP
CAdj = 0.1 mF
15
101 102 103
104 105
Frequency (Hz)
Figure 11. Ripple Rejection vs. Frequency
(Adjustable Output)
0.100
106
85
75
65
55
45 TCASE = 25°C
35
IOUT = 6A
(VIN − VOUT = 3V)
25 VRIPPLE = 1.6VPP
15
101
102 103
104 105 106
Frequency (Hz)
Figure 12. Ripple Rejection vs. Frequency
(3.3 V Fixed Output)
0.65
0.075
0.050
0.025
TCASE = 125°C
TCASE = 25°C
0 TCASE = 0°C
0 1.0 2.0
Output Current (A)
Figure 13. Load Regulation vs. Output Current
(Adjustable Output)
0.60
0.55
0.50
TCASE = 0°C
TCASE = 25°C
TCASE = 125°C
0.45
CIN = COUt = 22 mF Tantalum
0.40
1.0 2.0 3.0 4.0
5.0 6.0
7.0
VIN − VOUT (V)
Figure 14. Minimum Load Current vs VIN − VOUT
(Adjustable Output)
APPLICATIONS INFORMATION
The NCP1086 voltage regulator series provides
adjustable and 3.3 V output voltages at currents up to 1.5 A.
The regulator is protected against overcurrent conditions
and includes thermal shutdown.
The NCP1086 series has a composite PNP−NPN output
transistor and requires an output capacitor for stability. A
detailed procedure for selecting this capacitor is included in
the Stability Considerations section.
Adjustable Operation
The adjustable output device has an output voltage range
of 1.25 V to 5.5 V. An external resistor divider sets the
output voltage as shown in Figure 15. The regulator
maintains a fixed 1.25 V (typical) reference between the
output pin and the adjust pin.
A resistor divider network R1 and R2 causes a fixed
current to flow to ground. This current creates a voltage
across R2 that adds to the 1.25 V across R1 and sets the
overall output voltage. The adjust pin current (typically
50 mA) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of VOUT
is necessary.
The output voltage is set according to the formula:
ǒ ǓVOUT + VREF
R1 ) R2
R1
) IAdj
R2
The term IAdj × R2 represents the error added by the adjust
pin current.
R1 is chosen so that the minimum load current is at least
2.0 mA. R1 and R2 should be the same type, e.g. metal film
for best tracking over temperature. While not required, a
bypass capacitor from the adjust pin to ground will improve
ripple rejection and transient response. A 0.1 mF tantalum
capacitor is recommended for “first cut” design. Type and
value may be varied to obtain optimum performance vs
price.
http://onsemi.com
5
5 Page 
NCP1086
PACKAGE DIMENSIONS
TO−220−3
T SUFFIX
CASE 221A−08
ISSUE AA
−B− F
Q
H
−Y−
4
123
A
K
T
U
−T−
SEATING
PLANE
C
S
L
V
G
N
D 3 PL
0.25 (0.010) M B M Y
R
J
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
INCHES
DIM MIN MAX
A 0.560 0.625
B 0.380 0.420
C 0.140 0.190
D 0.025 0.035
F 0.139 0.155
G 0.100 BSC
H −−− 0.280
J 0.012 0.045
K 0.500 0.580
L 0.045 0.060
N 0.200 BSC
Q 0.100 0.135
R 0.080 0.115
S 0.020 0.055
T 0.235 0.255
U 0.000 0.050
V 0.045 −−−
MILLIMETERS
MIN MAX
14.23 15.87
9.66 10.66
3.56 4.82
0.64 0.89
3.53 3.93
2.54 BSC
−−− 7.11
0.31 1.14
12.70 14.73
1.15 1.52
5.08 BSC
2.54 3.42
2.04 2.92
0.51 1.39
5.97 6.47
0.00 1.27
1.15 −−−
http://onsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCP1086.PDF ] | |
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