1.5A Low Dropout Linear Regulator with Fast Transient Response

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)
Low Ground Current (1.5 mA @ Iout = 1.5 A)
Low Dropout Voltage (0.9 V @ Iout = 1.5 A)
Low Noise (37 mVrms)
1.2 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
1
xx = Voltage Rating
12 = 1.2 V
18 = 1.8 V
25 = 2.5 V
A = Assembly Location
Y = 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
DTV
LCD Monitors
Networking Equipment
Battery Powered Systems
Motherboards
Peripheral Cards
Set Top Boxes
Medical Equipment
Notebook Computers
© Semiconductor Components Industries, LLC, 2007
March, 2007 − Rev. 1
AYM
566xx G
G
SOT−223
CASE 318E
PIN CONNECTIONS
Vin
1
GND
2
Vout
3
GND
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
1
Publication Order Number:
NCP566/D
NCP566
PIN DESCRIPTION
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Pin No.
Symbol
1
Vin
2, Tab
Ground
3
Vout
Description
Positive Power Supply Input Voltage
Power Supply Ground
Regulated Output Voltage
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Input Voltage (Note 1)
Vin
9.0
V
Output Pin Voltage
Vout
−0.3 to Vin + 0.3
V
Thermal Characteristics (Notes 2, 3)
Thermal Resistance, Junction−to−Ambient
Thermal Resistance, Junction−to−Pin
RqJA
RqJP
107
12
Operating Junction Temperature Range
TJ
−40 to 150
°C
Operating Ambient Temperature Range
TA
−40 to 125
°C
Storage Temperature Range
Tstg
−55 to 150
°C
°C/W
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:
TJ(max) * TA
PD +
RqJA
3. As measured using a copper heat spreading area of 50 mm2, 1 oz copper thickness.
Vin
Cin
Voltage
Vref = 0.9 V
Reference
Output
Block
Stage
Vout
R1
R2
GND
GND
Cin − 4.7 mF to 150 mF recommended
Cout − 2.2 mF to 150 mF recommended
See more details in Applications Information section
Figure 1. Typical Schematic
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2
Cout
NCP566
ELECTRICAL CHARACTERISTICS (Vin = Vout + 1.6 V, for typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C,
(Note 4) unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
Output Voltage (10 mA < Iout < 1.5 A; 2.8 V < Vin < 9.0 V; TJ = −10 to 105°C)
1.2 V version
Vout
1.176
(−2%)
1.2
1.224
(+2%)
V
Output Voltage (10 mA < Iout < 1.5 A; 2.8 V < Vin < 9.0 V; TJ = −40 to 125°C)
1.2 V version
Vout
1.164
(−3%)
1.2
1.236
(+3%)
V
Output Voltage (10 mA < Iout < 1.5 A; 3.4 V < Vin < 9.0 V; TJ = −10 to 105°C)
1.8 V version
Vout
1.764
(−2%)
1.8
1.836
(+2%)
V
Output Voltage (10 mA < Iout < 1.5 A; 3.4 V < Vin < 9.0 V; TJ = −40 to 125°C)
1.8 V version
Vout
1.746
(−3%)
1.8
1.854
(+3%)
V
Output Voltage (10 mA < Iout < 1.5 A; 4.1 V < Vin < 9.0 V; TJ = −10 to 105°C)
2.5 V version
Vout
2.450
(−2%)
2.5
2.550
(+2%)
V
Output Voltage (10 mA < Iout < 1.5 A; 4.1 V < Vin < 9.0 V; TJ = −40 to 125°C)
2.5 V version
Vout
2.425
(−3%)
2.5
2.575
(+3%)
V
Line Regulation (Iout = 10 mA)
Regline
−
0.02
−
%
Load Regulation (10 mA < Iout < 1.5 A)
Regload
−
0.04
−
%
Dropout Voltage (Iout = 1.5 A) (Note 5)
Vdo
−
0.9
1.3
V
Current Limit
Ilim
1.6
3.5
−
A
Ripple Rejection (120 Hz; Iout = 1.5 A)
RR
−
85
−
dB
Ripple Rejection (1 kHz; Iout = 1.5 A)
RR
−
75
−
dB
−
160
−
°C
Ground Current (Iout = 1.5 A)
Iq
−
1.5
3.0
mA
Output Noise Voltage (f = 100 Hz to 100 kHz, Iout = 1.5 A)
Vn
−
37
−
mVrms
Thermal Shutdown
4. Refer to Application Information section for capacitor details.
5. Dropout voltage is a measurement of the minimum input/output differential at full load.
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NCP566
TYPICAL CHARACTERISTICS
1.820
VOUT, OUTPUT VOLTAGE (V)
VOUT, OUTPUT VOLTAGE (V)
2.53
2.52
2.51
2.50
2.49
Vout = 2.5 V
Iout = 10 mA
2.48
2.47
−50 −25
0
25
50
100
75
125
1.815
1.810
1.805
1.800
1.795
1.790
Vout = 1.8 V
Iout = 10 mA
1.785
1.780
−50
150
−25
TJ, JUNCTION TEMPERATURE (°C)
1.205
1.200
1.195
1.190
Vout = 1.2 V
Iout = 10 mA
0
50
25
75
100
125
150
ISC, SHORT CIRCUIT CURRENT LIMIT (A)
1.210
125
150
3.70
3.65
3.60
3.55
3.50
−50
−25
0
25
50
75
100
125
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Short Circuit Current Limit
vs. Temperature
1.2
1.0
Iout = 1.5 A
0.8
0.6
Iout = 50 mA
0.4
0.2
−25
100
3.75
Figure 4. Output Voltage vs. Temperature
0
−50
75
3.80
TJ, JUNCTION TEMPERATURE (°C)
Vin − Vout, DROPOUT VOLTAGE (V)
VOUT, OUTPUT VOLTAGE (V)
1.215
−25
50
Figure 3. Output Voltage vs. Temperature
1.220
1.180
−50
25
TJ, JUNCTION TEMPERATURE (°C)
Figure 2. Output Voltage vs. Temperature
1.185
0
0
25
50
75
100
125
TJ, JUNCTION TEMPERATURE (°C)
Figure 6. Dropout Voltage vs. Temperature
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4
150
150
NCP566
TYPICAL CHARACTERISTICS
1.80
IGND, GROUND CURRENT (mA)
IGND, GROUND CURRENT (mA)
1.70
1.65
1.60
1.55
1.50
1.45
Iout = 1.5 A
1.40
−50
1.75
1.70
1.65
1.60
1.55
−25
0
50
100
25
75
125
TJ, JUNCTION TEMPERATURE (°C)
0
150
Figure 7. Ground Current vs. Temperature
300
600
900
1200
Iout, OUTPUT CURRENT (mA)
Figure 8. Ground Current vs. Output Current
1000
100
Vout = 2.5 V
90
Unstable
100
80
Cout = 10 mF
Cout = 2.2 mF
70
60
ESR (W)
RIPPLE REJECTION (dB)
1500
50
40
10
1
Cout = 150 mF
Iout = 1.5 A
30
Stable
0.1
20
10
0
10
0.01
100
1000
10000
F, FREQUENCY (Hz)
100000 1000000
0
250
500
750
1000
1250
1500
OUTPUT CURRENT (mA)
Figure 9. Ripple Rejection vs. Frequency
Figure 10. Output Capacitor ESR Stability vs.
Output Current
Vout = 1.2 V
Vout = 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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NCP566
TYPICAL CHARACTERISTICS
Vout = 1.2 V
Vout = 1.2 V
Figure 14. Load Transient from 1.5 A to 10 mA
140
140
120
120
NOISE DENSITY (nV/√Hz)
NOISE DENSITY (nV/√Hz)
Figure 13. Load Transient from 1.5 A to 10 mA
100
80
60
40
Vout = 1.2 V
Iout = 10 mA
20
0
100
80
60
40
Vout = 1.2 V
Iout = 1.5 A
20
0
0
10
20
30
40
50
60
70
80
90
100
0
f, FREQUENCY (kHz)
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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NCP566
150 mF should cover most of the applications. The higher
capacitance the better load transient response. When a high
value capacitor is used, a low value capacitor is also
recommended to be put in parallel. The NCP566 is
optimized 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 load
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.
APPLICATION INFORMATION
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
Typical values of parameters in Electrical Characteristics
section and in Typical Characteristics section were
measured with input and output capacitors equal to 150 mF
unless otherwise noted.
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. The range of 4.7 mF to 150 mF should cover most of
the applications. The higher capacitance the lower change of
input voltage due to line and load transients. 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 range of 2.2 mF to
Load Transient Measurement
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
Vout
−VCC
Vin
Pulse
V
NCP566
RL
Evaluation Board
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:
PD +
TJ(max) * TA
RqJA
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
output voltage and the rate at which Vin drops. In the
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.
180
qJA (°C/W)
160
140
120
100
1 oz Cu
80
60
2 oz Cu
40
0
50 100 150
200 250 300 350 400 450 500
COPPER HEAT−SPREADER AREA (mm sq)
Figure 19. Thermal Resistance
1N4002 (Optional)
VIN
VOUT
VIN
CIN
VOUT
NCP566
COUT
GND
Figure 18. Protection Diode for Large
Output Capacitors
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NCP566
ORDERING INFORMATION
Device
NCP566ST12T3G
NCP566ST18T3G
NCP566ST25T3G
Nominal Output Voltage*
Package
Shipping †
1.2 V
SOT−223
(Pb−Free)
4000 / Tape & Reel
1.8 V
SOT−223
(Pb−Free)
4000 / Tape & Reel
2.5 V
SOT−223
(Pb−Free)
4000 / Tape & Reel
*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
HE
1
2
E
3
b
e1
e
0.08 (0003)
C
q
A
DIM
A
A1
b
b1
c
D
E
e
e1
L1
HE
q
A1
MIN
1.50
0.02
0.60
2.90
0.24
6.30
3.30
2.20
0.85
1.50
6.70
0°
MILLIMETERS
NOM
MAX
1.63
1.75
0.06
0.10
0.75
0.89
3.06
3.20
0.29
0.35
6.50
6.70
3.50
3.70
2.30
2.40
0.94
1.05
1.75
2.00
7.00
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°
INCHES
NOM
0.064
0.002
0.030
0.121
0.012
0.256
0.138
0.091
0.037
0.069
0.276
−
MAX
0.068
0.004
0.035
0.126
0.014
0.263
0.145
0.094
0.041
0.078
0.287
10°
L1
SOLDERING FOOTPRINT*
3.8
0.15
2.0
0.079
2.3
0.091
2.3
0.091
6.3
0.248
2.0
0.079
1.5
0.059
SCALE 6:1
mm Ǔ
ǒinches
*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
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: [email protected]
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5773−3850
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ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
NCP566/D
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