NCP566 [ONSEMI]
1.5 A Low Dropout Linear Regulator; 1.5低压差线性稳压器
| 型号： | NCP566 |
| 厂家： | 
ONSEMI |
| 描述： | 1.5 A Low Dropout Linear Regulator |
| 文件： | 总10页 (文件大小：110K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NCP566
1.5 A Low Dropout
Linear Regulator
The NCP566 low dropout linear regulator will provide 1.5 A at a
fixed output voltage. The fast loop response and low dropout voltage
make this regulator ideal for applications where low voltage and good
load transient response are important. Device protection includes
current limit, short circuit protection, and thermal shutdown.
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MARKING
DIAGRAMS
Features
• Ultra Fast Transient Response (t1.0 ms)
AYM
566xx G
G
SOT−223
CASE 318E
• Low Ground Current (1.5 mA @ Iout = 1.5 A)
• Low Dropout Voltage (0.9 V @ Iout = 1.5 A)
• Low Noise (37 mVrms)
1
• 1.2 V, 1.8 V, 2.5 V Fixed Output Versions.
Other Fixed Voltages Available on Request
• Current Limit Protection
• Thermal Shutdown Protection
• These are Pb−Free Devices
xx = Voltage Rating
12 = 1.2 V
18 = 1.8 V
25 = 2.5 V
A
Y
=
=
Assembly Location
Year
M = Date Code
G
= Pb−Free Package
Typical Applications
(Note: Microdot may be in either location)
• Servers
• ASIC Power Supplies
• Post Regulation for Power Supplies
• Constant Current Source
PIN CONNECTIONS
V
in
1
2
3
GND
GND
V
out
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
©
Semiconductor Components Industries, LLC, 2007
1
Publication Order Number:
March, 2007 − Rev. 0
NCP566/D
NCP566
PIN DESCRIPTION
Pin No.
Symbol
Description
Positive Power Supply Input Voltage
1
2, Tab
3
V
in
Ground
Power Supply Ground
V
out
Regulated Output Voltage
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
V
Input Voltage (Note 1)
V
in
9.0
Output Pin Voltage
V
out
−0.3 to V + 0.3
V
in
Thermal Characteristics (Notes 2, 3)
°C/W
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Pin
RqJA
RqJP
107
12
Operating Junction Temperature Range
Operating Ambient Temperature Range
Storage Temperature Range
TJ
−40 to 150
−40 to 125
−55 to 150
°C
°C
°C
T
A
Tstg
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. This device series contains ESD protection and exceeds the following tests:
Human Body Model JESD 22−A114−B
Machine Model JESD 22−A115−A
2. The maximum package power dissipation is:
T
* T
J(max)
A
P
D
+
R
qJA
3. As measured using a copper heat spreading area of 50 mm , 1 oz copper thickness.
2
V
in
Voltage
Reference
Block
C
150mF
in
V
ref
= 0.9 V
V
out
Output
Stage
R1
R2
C
150mF
out
GND
GND
Figure 1. Typical Schematic
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2
NCP566
ELECTRICAL CHARACTERISTICS (V
V
+ 1.6 V, for typical values T = 25°C, for min/max values T = −40°C to +125°C,
in = out
J
J
C
in
= C = 150 mF unless otherwise noted.)
out
Characteristic
Output Voltage (10 mA < I < 1.5 A; 2.8 V < V < 9.0 V; T = −10 to 105°C)
Symbol
Min
Typ
Max
Unit
V
out
1.176
(−2%)
1.2
1.224
(+2%)
V
out
in
J
1.2 V version
Output Voltage (10 mA < I < 1.5 A; 2.8 V < V < 9.0 V; T = −40 to 125°C)
V
1.164
(−3%)
1.2
1.8
1.8
2.5
2.5
1.236
(+3%)
V
V
V
V
V
out
in
J
out
1.2 V version
Output Voltage (10 mA < I < 1.5 A; 3.4 V < V < 9.0 V; T = −10 to 105°C)
V
out
1.764
(−2%)
1.836
(+2%)
out
in
J
1.8 V version
Output Voltage (10 mA < I < 1.5 A; 3.4 V < V < 9.0 V; T = −40 to 125°C)
V
out
1.746
(−3%)
1.854
(+3%)
out
in
J
1.8 V version
Output Voltage (10 mA < I < 1.5 A; 4.1 V < V < 9.0 V; T = −10 to 105°C)
V
out
2.450
(−2%)
2.550
(+2%)
out
in
J
2.5 V version
Output Voltage (10 mA < I < 1.5 A; 4.1 V < V < 9.0 V; T = −40 to 125°C)
V
out
2.425
(−3%)
2.575
(+3%)
out
in
J
2.5 V version
Line Regulation (I = 10 mA)
Reg
−
−
0.02
0.04
0.9
3.5
85
−
−
%
%
out
line
Load Regulation (10 mA < I < 1.5 A)
Reg
load
out
Dropout Voltage (I = 1.5 A) (Note 4)
Vdo
−
1.3
−
V
out
Current Limit
I
1.6
−
A
lim
Ripple Rejection (120 Hz; I = 1.5 A)
RR
RR
−
dB
dB
°C
out
Ripple Rejection (1 kHz; I = 1.5 A)
−
75
−
out
Thermal Shutdown
−
160
1.5
37
−
Ground Current (I = 1.5 A)
Iq
−
3.0
−
mA
mVrms
out
Output Noise Voltage (f = 100 Hz to 100 kHz, I = 1.5 A)
V
−
out
n
4. Dropout voltage is a measurement of the minimum input/output differential at full load.
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3
NCP566
TYPICAL CHARACTERISTICS
2.53
2.52
1.820
1.815
1.810
1.805
1.800
1.795
1.790
2.51
2.50
2.49
V
= 2.5 V
= 10 mA
out
2.48
2.47
V
out
= 1.8 V
I
1.785
1.780
out
I
= 10 mA
out
−50 −25
0
25
50
75
100 125 150
−50 −25
0
25
50
75
100
125 150
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 2. Output Voltage vs. Temperature
Figure 3. Output Voltage vs. Temperature
3.80
3.75
3.70
3.65
3.60
1.220
1.215
1.210
1.205
1.200
1.195
1.190
3.55
3.50
V
= 1.2 V
= 10 mA
out
1.185
1.180
I
out
−50 −25
0
25
50
75
100
125
150
−50 −25
0
25
50
75
100 125
150
T , JUNCTION TEMPERATURE (°C)
J
T , JUNCTION TEMPERATURE (°C)
J
Figure 4. Output Voltage vs. Temperature
Figure 5. Short Circuit Current Limit
vs. Temperature
1.2
1.0
0.8
0.6
0.4
I
= 1.5 A
out
I
= 50 mA
out
0.2
0
−50 −25
0
25
50
75
100
125 150
T , JUNCTION TEMPERATURE (°C)
J
Figure 6. Dropout Voltage vs. Temperature
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4
NCP566
TYPICAL CHARACTERISTICS
1.70
1.65
1.60
1.55
1.50
1.80
1.75
1.70
1.65
1.60
1.45
1.40
I
= 1.5 A
out
1.55
0
300
600
900
1200
1500
−50 −25
0
25
50
75
100
125 150
T , JUNCTION TEMPERATURE (°C)
J
I
, OUTPUT CURRENT (mA)
out
Figure 7. Ground Current vs. Temperature
Figure 8. Ground Current vs. Output Current
1000
100
100
90
80
70
60
50
40
30
20
10
0
Unstable
10
1
I
= 1.5 A
out
V
C
= 2.5 V
Stable
out
= 10 mF
out
0
250
500
750
1000
1250
1500
10
100
1000
10000
100000 1000000
OUTPUT CURRENT (mA)
F, FREQUENCY (Hz)
Figure 9. Ripple Rejection vs. Frequency
Figure 10. Output Capacitor ESR Stability vs.
Output Current
V
out
= 1.2 V
V
out
= 1.2 V
Figure 11. Load Transient from 10 mA to 1.5 A
Figure 12. Load Transient from 10 mA to 1.5 A
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5
NCP566
TYPICAL CHARACTERISTICS
V
out
= 1.2 V
V
out
= 1.2 V
Figure 13. Load Transient from 1.5 A to 10 mA
Figure 14. Load Transient from 1.5 A to 10 mA
140
120
100
140
120
100
80
60
40
80
60
40
V
= 1.2 V
= 10 mA
V
I
out
= 1.2 V
= 1.5 A
out
out
20
0
20
0
I
out
0
10 20 30 40 50 60 70 80 90 100
f, FREQUENCY (kHz)
0
10 20 30 40 50 60 70 80 90 100
f, FREQUENCY (kHz)
Figure 15. Noise Density vs. Frequency
Figure 16. Noise Density vs. Frequency
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6
NCP566
APPLICATION INFORMATION
for use with a 150 mF OSCON 16SA150M type in parallel
with a 10 mF OSCON 10SL10M type from Sanyo. The
10 mF capacitor is used for best AC stability while 150 mF
capacitor is used for achieving excellent output transient
response. The output capacitors should be placed as close as
possible to the output pin of the device. If not, the excellent
load transient response of NCP566 will be degraded.
The NCP566 low dropout linear regulator provides fixed
voltages at currents up to 1.5 A. It features ultra fast transient
response and low dropout voltage. These devices contain
output current limiting, short circuit protection and thermal
shutdown protection.
Input, Output Capacitor and Stability
Load Transient Measurement
An input bypass capacitor is recommended to improve
transient response or if the regulator is located more than a
few inches from the power source. This will reduce the
circuit’s sensitivity to the input line impedance at high
frequencies and significantly enhance the output transient
response. Different types and different sizes of input
capacitors can be chosen dependent on the quality of power
supply. A 150 mF OSCON 16SA150M type from Sanyo
should be adequate for most applications. The bypass
capacitor should be mounted with shortest possible lead or
track length directly across the regulator’s input terminals.
The output capacitor is required for stability. The NCP566
remains stable with ceramic, tantalum, and aluminum−
electrolytic capacitors with a minimum value of 1.0 mF with
ESR between 50 mW and 2.5 W. The NCP566 is optimized
Large load current changes are always presented in
microprocessor applications. Therefore good load transient
performance is required for the power stage. NCP566 has
the feature of ultra fast transient response. Its load transient
responses in Figures 11 through 14 are tested on evaluation
board shown in Figure 17. The evaluation board consists of
NCP566 regulator circuit with decoupling and filter
capacitors and the pulse controlled current sink to obtain
load current transitions. The load current transitions are
measured by current probe. Because the signal from current
probe has some time delay, it causes un−synchronization
between the load current transition and output voltage
response, which is shown in Figures 11 through 14.
GEN
V
out
−V
CC
V
NCP566
RL
V
in
Evaluation Board
Pulse
GND
+
+
GND
Scope Voltage Probe
Figure 17. Schematic for Transient Response Measurement
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7
NCP566
PCB Layout Considerations
Thermal Considerations
Good PCB layout plays an important role in achieving
good load transient performance. Because it is very sensitive
to its PCB layout, particular care has to be taken when
tackling Printed Circuit Board (PCB) layout. For
microprocessor applications it is customary to use an output
capacitor network consisting of several capacitors in
parallel. This reduces the overall ESR and reduces the
instantaneous output voltage drop under transient load
conditions. The output capacitor network should be as close
as possible to the load for the best results.
This series contains an internal thermal limiting circuit
that is designed to protect the regulator in the event that the
maximum junction temperature is exceeded. This feature
provides protection from a catastrophic device failure due to
accidental overheating. It is not intended to be used as a
substitute for proper heat sinking. The maximum device
power dissipation can be calculated by:
T
* T
A
J(max)
P
D
+
R
qJA
200
Protection Diodes
When large external capacitors are used with a linear
regulator it is sometimes necessary to add protection diodes.
If the input voltage of the regulator gets shorted, the output
capacitor will discharge into the output of the regulator. The
discharge current depends on the value of the capacitor, the
180
160
140
120
100
80
output voltage and the rate at which V drops. In the
in
NCP566 linear regulator, the discharge path is through a
large junction and protection diodes are not usually needed.
If the regulator is used with large values of output
capacitance and the input voltage is instantaneously shorted
to ground, damage can occur. In this case, a diode connected
as shown in Figure 18 is recommended.
1 oz Cu
2 oz Cu
60
40
0
50 100 150 200 250 300 350 400 450 500
COPPER HEAT−SPREADER AREA (mm sq)
Figure 19. Thermal Resistance
1N4002 (Optional)
V
V
OUT
IN
V
V
OUT
IN
NCP566
GND
C
IN
C
OUT
Figure 18. Protection Diode for Large
Output Capacitors
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8
NCP566
ORDERING INFORMATION
Device
†
Nominal Output Voltage*
Package
Shipping
NCP566ST12T3G
SOT−223
(Pb−Free)
1.2 V
1.8 V
2.5 V
4000 / Tape & Reel
4000 / Tape & Reel
4000 / Tape & Reel
NCP566ST18T3G
NCP566ST25T3G
SOT−223
(Pb−Free)
SOT−223
(Pb−Free)
*For other fixed output versions, please contact the factory.
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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9
NCP566
PACKAGE DIMENSIONS
SOT−223 (TO−261)
CASE 318E−04
ISSUE L
D
b1
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
4
2
MILLIMETERS
INCHES
NOM
0.064
0.002
0.030
0.121
0.012
0.256
0.138
0.091
0.037
0.069
0.276
−
H
E
E
DIM
A
A1
b
b1
c
D
E
e
e1
L1
MIN
1.50
0.02
0.60
2.90
0.24
6.30
3.30
2.20
0.85
1.50
6.70
0°
NOM
1.63
0.06
0.75
3.06
0.29
6.50
3.50
2.30
0.94
1.75
7.00
−
MAX
1.75
0.10
0.89
3.20
0.35
6.70
3.70
2.40
1.05
2.00
7.30
10°
MIN
0.060
0.001
0.024
0.115
0.009
0.249
0.130
0.087
0.033
0.060
0.264
0°
MAX
0.068
0.004
0.035
0.126
0.014
0.263
0.145
0.094
0.041
0.078
0.287
10°
1
3
b
e1
e
C
q
H
E
A
q
0.08 (0003)
A1
L1
SOLDERING FOOTPRINT*
3.8
0.15
2.0
0.079
6.3
0.248
2.3
0.091
2.3
0.091
2.0
0.079
mm
inches
1.5
0.059
ǒ
Ǔ
SCALE 6:1
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
The product described herein (NCP566), may be covered by one or more of the following U.S. patents: 5,920,184; 5,834,926.
There may be other patents pending.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
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PUBLICATION ORDERING INFORMATION
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Phone: 421 33 790 2910
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Phone: 81−3−5773−3850
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For additional information, please contact your local
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NCP566/D
相关型号：
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