ONSEMI NCP5661DT12RKG

NCP5661
Low Output Voltage,
Ultra−Fast 1.0 A Low Dropout
Linear Regulator with Enable
The NCP5661 is a high performance, low dropout linear regulator
designed for high power applications that require up to 1.0 A current.
It is offered in both fixed and adjustable output versions. With output
voltages as low as 0.9 V and ultra−fast response times for load
transients, the NCP5661 also provides additional features such as
Enable and Error Flag (for the fixed output version), increasing the
utility of this device. A thermally robust, 5 pin DPAK, combined with
an architecture that offers low ground current (independent of load),
provides for a superior high−current LDO solution.
Features
•
•
•
•
•
•
•
•
•
•
•
Ultra−Fast Transient Response (Settling Time: 1−3 ms)
Low Noise Without Bypass Capacitor (26 mVrms)
Low Ground Current Independent of Load (3.0 mA Maximum)
Fixed/Adjustable Output Voltage Versions
Enable Function
Error Flag (Fixed Output Version)
Current Limit Protection
Thermal Protection
0.9 V Reference Voltage for Ultra−Low Output Operation
Power Supply Rejection Ratio > 65 dB
These are Pb−Free Devices
Applications
•
•
•
•
•
•
Servers
ASIC Power Supplies
Post Regulation for Power Supplies
Constant Current Source
Networking Equipment
Gaming and STB Modules
© Semiconductor Components Industries, LLC, 2005
July, 2005 − Rev. 3
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MARKING
DIAGRAM
661xG
ALYWW
1
5
DPAK−5
CENTER LEAD CROP
CASE 175AA
Tab = Ground
Pin: 1. Enable
2. Vin
3. Ground
4. Vout
5. Adj (Adjustable Output)
5. Error Flag (Fixed Output)
x
= A for Adjustable Version
B for Fixed 1.2 V
C for Fixed 3.3 V
A
= Assembly Location
L
= Wafer Lot
Y
= Year
WW = Work Week
G
= Pb−Free
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 10 of this data sheet.
1
Publication Order Number:
NCP5661/D
NCP5661
PIN FUNCTION DESCRIPTION
Pin
Adj/Fixed
Pin Name
Description
1
Enable
This pin allows for on/off control of the regulator. To disable the device, connect to Ground. If this
function is not in use, connect to Vin.
2
Vin
3
Ground
4
Vout
5
Adj
(Adjustable Version)
5
Error Flag
(Fixed Version)
Positive Power Supply Input Voltage
Power Supply Ground
Regulated Output Voltage
This pin is connected to the resistor divider network and programs the output voltage.
An Error Flag is triggered when the output voltage is out of regulation excluding transient signals
that may occur. Requires a pullup resistor f 100 kW.
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Input Voltage
Vin
18
V
Output Pin Voltage
Vout
−0.3 to Vin +0.3
V
Adjust Pin Voltage
Vadj
−0.3 to Vin +0.3
V
Enable Pin Voltage
Ven
−0.3 to Vin +0.3
V
Error Flag Voltage
Vef
−0.3 to Vin +0.3
V
Error Flag Current
Ief
3.0
mA
RθJA
RθJC
100
8.0
Operating Junction Temperature Range
TJ
−40 to +150
°C
Storage Temperature Range
Tstg
−55 to +150
°C
°C/W
Thermal Characteristics
Thermal Resistance, Junction−to−Air
Thermal Resistance, Junction−to−Case
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
NOTE: This device series contains ESD protection and exceeds the following tests:
Human Body Model (HBM) JESD 22−A114−B
Machine Model (MM) JESD 22−A115−A.
The maximum package power dissipation is:
*T
T
J(max)
A
P +
D
R
qJA
The bipolar process employed for this IC is fully characterized and rated for reliable 18 V VCCmax operation. To avoid damaging
the part or degrading it’s reliability, power dissipation transients should be limited to under 20 W for DPAK.
For open−circuit to short−circuit transient,
PDTransient = VCCmax * ISC.
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NCP5661
ELECTRICAL CHARACTERISTICS
(Vin − Vout = 1.5 V, for typical values TJ = 25°C, for min/max values TJ = −40°C to 125°C, Cin = Cout = 150 mF unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
Input Voltage
Vin
2.0
−
9.0
V
Output Noise Voltage
Vn
−
26
−
mVrms
−1%
−1.5%
−2%
−
0.9
−
+1%
+1.5%
+2%
ADJUSTABLE OUTPUT VERSION
Output Voltage Accuracy
TJ = 25°C (Iout = 10 mA to 1.0 A)
TJ = −20 to +125°C (Iout = 10 mA to 1.0 A)
TJ = −40 to +150°C (Iout = 10 mA to 1.0 A)
Vout
Adjustable Pin Input Current
Iadj
−
40
−
nA
Line Regulation (Iout = 10 mA, Vout+1.5 V < Vin < 7.0 V)
REGline
−
0.03
−
%
Load Regulation (10 mA < Iout < 1.0 A)
REGload
−
0.03
−
%
Dropout Voltage (Iout = 1.0 A)
VDO
−
1.0
1.3
V
Peak Output Current Limit
Iout
1.0
−
−
A
Internal Current Limitation
Ilim
−
1.5
−
A
Ripple Rejection (120 Hz)
Ripple Rejection (1.0 kHz)
RR
−
−
70
65
−
−
dB
TSHD
−
160
−
°C
Iq
Iqds
−
−
1.3
10
3.0
300
mA
mA
1.3
−
−
−
−
0.3
−
−
0.5
0.5
−
−
Thermal Shutdown (Guaranteed by Design)
V
Ground Current
Iout = 1.0 A
Disabled State
Enable Input Threshold Voltage
Ven
Voltage Increasing, On State, Logic High
Voltage Decreasing, Off State, Logic Low
Enable Input Current
V
mA
Ien
Enable Pin Voltage = 0.3 Vmax
Enable Pin Voltage = 1.3 Vmin
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NCP5661
ELECTRICAL CHARACTERISTICS
(Vin − Vout = 1.5 V, for typical values TJ = 25°C, for min/max values TJ = −40°C to 125°C, Cin = Cout = 150 mF unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
Input Voltage
Vin
2.0
−
9.0
V
Output Noise Voltage (Vout = 0.9 V)
Vn
−
26
−
mVrms
−1%
−1.5%
−2%
−
Vout
−
+1%
+1.5%
+2%
FIXED OUTPUT VOLTAGE
Output Voltage Accuracy (Note 1)
TJ = 25°C (Iout = 10 mA to 1.0 A)
TJ = −20 to +125°C (Iout = 10 mA to 1.0 A)
TJ = −40 to +150°C (Iout = 10 mA to 1.0 A)
Vout
V
Line Regulation (Iout = 10 mA, Vout+1.5 V < Vin < 7.0 V)
REGline
−
0.03
−
%
Load Regulation (10 mA < Iout < 1.0 A)
REGload
−
0.2
−
%
Dropout Voltage (Iout = 1.0 A)
VDO
−
1.0
1.3
V
Peak Output Current Limit
Iout
1.0
−
−
A
Internal Current Limitation
Ilim
−
1.5
−
A
Ripple Rejection (120 Hz)
Ripple Rejection (1.0 kHz)
RR
−
−
70
65
−
−
dB
TSHD
−
160
−
°C
Iq
Iqds
−
−
1.3
30
3.0
300
mA
mA
1.3
−
−
−
−
0.3
−
−
0.5
0.5
−
−
88
90
92
94
97
97
Thermal Shutdown (Guaranteed by Design)
Ground Current
Iout = 1.0 A
Disabled State
Enable Input Threshold Voltage
Ven
Voltage Increasing, On State, Logic High
Voltage Decreasing, Off State, Logic Low
Enable Input Current
V
mA
Ien
Enable Pin Voltage = 0.3 Vmax
Enable Pin Voltage = 1.3 Vmin
Error Flag (Fixed Output)
Veflt
1.2 V Output
3.3 V Output
% of Vout
Error Flag Output Low Voltage Saturation (Ief = 1.0 mA)
Vefdo
−
200
−
mV
Error Flag Leakage
Iefleak
−
1.0
−
mA
Tef
−
50
−
ms
Error Flag Blanking Time (Note 2)
1. Fixed output voltages available at 0.9 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V, 3.3 V per request.
2. Can be disabled per customer request.
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NCP5661
Vin
IN
ON
Enable
Block
Voltage
Reference
Block
Cin
EN
OFF
Vref = 0.9 V
R3
Vout
Output
Stage
R1
CC*
ADJ
R4
Cout
R2
GND
R1 + R2
ǒVVout
* 1Ǔ
ref
GND
*CC = 5.0 to 200 pF
Figure 1. Typical Schematic, Adjustable Output Version
Vin
IN
ON
Cin
Voltage
Reference
Block
Enable
Block
Vref = 0.9 V
R3
EN
Rflag = 100 kW
OFF
Vout
Output
Stage
Cc
R1
Cout
R4
R2
Error
Flag
GND
GND
Figure 2. Typical Schematic, Fixed Output Version
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EF
NCP5661
1.00
VDO, DROPOUT VOLTAGE (V)
VDO, DROPOUT VOLTAGE (V)
1.2
1.0
0.8
0.6
0.4
0.2
0
−40
−20
0
20
40
60
80 100 120
TJ, JUNCTION TEMPERATURE (°C)
0.95
0.90
0.85
0.80
Vout = 2.5 V Adjustable
Cin = 150 mF
Cout = 10 to 150 mF
TJ = 25°C
0.75
0.70
0.0
140
ISC, SHORT CIRCUIT LIMIT (A)
IGND, GROUND CURRENT (mA)
0.4
0.5
0.6
0.7
0.8
0.9
1.0
2.0
3.0
2.5
2.0
1.5
1.0
0.5
−20
0
20
40
60
80
100
120
1.8
1.6
1.4
1.2
1.0
−40
140
TJ, JUNCTION TEMPERATURE (°C)
−20
0
20
40
60
80
100
120
140
TJ, JUNCTION TEMPERATURE (°C)
Figure 5. Ground Current vs. Temperature
Figure 6. Short Circuit Current Limit vs.
Temperature
0.95
0.900
Vout, OUTPUT VOLTAGE (V)
Vout, OUTPUT VOLTAGE (V)
0.3
Figure 4. Dropout Voltage vs. Output Current
3.5
0.90
0.85
0.80
Iout = 10 mA
Cin = 150 mF
Cout = 1.0 to 150 mF
TJ = 25°C
0.75
0.70
1.0
0.2
Iout, OUTPUT CURRENT (A)
Figure 3. Dropout Voltage vs. Temperature
0
−40
0.1
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0.898
0.896
0.892
0.890
0.0
9.0
Vin, INPUT VOLTAGE (V)
Figure 7. Output Voltage vs. Input Voltage
Vin = 3.3 V
Iout = 1.0 A maximum
Cin = 150 mF
Cout = 1.0 to 150 mF
TJ = 25°C
0.894
0.2
0.4
0.6
0.8
Iout, OUTPUT CURRENT (A)
1.0
Figure 8. Output Voltage vs. Output Load Current
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NCP5661
0.9
90
OUTPUT CURRENT (A)
0.8
RR, RIPPLE REJECTION (dB)
TA = 25°C
L = 25 mm Copper
0.7
0.6
0.5
0.4
0.3
0.2
0.1
80
70
Iout = 10 mA
60
50
40
Vin = 4.0 V
Vout = 0.9 V
Cin = 0 mF
Cout = 1.0 mF
TJ = 25°C
30
20
10
0
0.0
0
2
4
6
8
10
12
14
16
20
0
1
10
INPUT−OUTPUT VOLTAGE DIFFERENTIAL (V)
90
90
NOISE DENSITY (nVrms/ǨHz)
100
80
70
60
Vin = 3.3 V
Vout = 0.9 V
Iout = 10 mA
Cin = 150 mF
Cout = 150 mF
TJ = 25°C
40
30
20
10
80
70
60
50
Vin = 3.3 V
Vout = 0.9 V
Iout = 1.0 A
Cin = 150 mF
Cout = 150 mF
TJ = 25°C
40
30
20
10
0
0
Start: 100 Hz
Stop: 100 kHz
Start: 100 Hz
Stop: 100 kHz
F, FREQUENCY (kHz)
F, FREQUENCY (kHz)
Figure 11. Noise Density vs. Frequency
Figure 12. Noise Density vs. Frequency
1000
1000
100
100
150 mF
10 mF
10
1.0
100 mF
10
100 mF
1.0
10 mF
150 mF
0.10
Unstable
Unstable
ESR (W)
ESR (W)
1000
Figure 10. Ripple Rejection vs. Frequency
100
50
100
F, FREQUENCY (kHz)
Figure 9. Output Current vs. Input−Output
Voltage Differential
NOISE DENSITY (nVrms/ǨHz)
Iout = 1.0 A
Stable
0.10
Stable
0.01
0.01
0
100 200 300 400 500 600 700 800 900 1000
0
100 200 300 400 500 600 700 800 900 1000
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
Figure 13. 1.2 Volt Output Stability with Output
Capacitor ESR
Figure 14. 3.3 Volt Output Stability with Output
Capacitor ESR
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NCP5661
Iout = 10 mA to 1.0 A
Iout
0.5 A/Div
Iout
0.5 A/Div
Vout
10 mV/Div
Vout
10 mV/Div
Vin = 4.0 V
Vout = 0.9 V
Cin = 150 mF
Cout = 150 mF
TJ = 25°C
Vin = 4.0 V
Vout = 0.9 V
Cin = 150 mF
Cout = 150 mF
TJ = 25°C
Iout = 1.0 A to 10 mA
TIME (1.0 ms/Div)
TIME (1.0 ms/Div)
Figure 15. Load Transient Response
Figure 16. Load Transient Response
APPLICATION INFORMATION
Adjustable Output Operation
The NCP5661 is a high performance low dropout 1.0 A
linear regulator suitable for high power applications,
featuring an ultra−fast response time and low noise without
a bypass capacitor. It is offered in both fixed and adjustable
output versions with voltages as low as 0.9 V. Additional
features, such as Enable and Error Flag (fixed output
version) increase the utility of the NCP5661. It is thermally
robust and includes the safety features necessary during a
fault condition, which provide for an attractive high current
LDO solution for server, ASIC power supplies, networking
equipment applications, and many others.
The application circuit for the adjustable output version is
shown in Figure 1. The reference voltage is 0.9 V and the
adjustable pin current is typically 40 nA. A resistor divider
network, R1 and R2, is calculated using the following
formula:
R1 + R2
ǒVVout
* 1Ǔ
ref
Current Limit Operation
As the peak output current increases beyond its limitation,
the device is internally clampled to 1.5 A, thus causing the
output voltage to decrease and go out of regulation. This
allows the device never to exceed the maximum power
dissipation.
Input Capacitor
The recommended input capacitor value is a 150 mF
OSCON with an Equivalent Series Resistance (ESR) of
50 mW. It is especially required if the power source is
located more than a few inches from the NCP5661. This
capacitor will reduce device sensitivity and enhance the
output transient response time. The PCB layout is very
important and in order to obtain the optimal solution, the Vin
and GND traces should be sufficiently wide to minimize
noise and unstable operation.
Error Flag Operation
The Error Flag pin on the NCP5661 will produce a logic
Low when it drops below the nominal output voltage. Refer
to the electrical characteristics for the threshold values at
which point the Error Flag goes Low. When the NCP5661
is above the nominal output voltage, the Error Flag will
remain at logic High.
The external pullup resistor needs to be connected
between Vin (Pin 1) and the Error Flag pin (Pin 5). A resistor
of approximately 100 kW is recommended to minimize the
current consumption. No pullup resistor is required if the
Error Flag output is not being used.
Output Capacitor
Proper output capacitor selection is required to maintain
stability. The NCP5661 is guaranteed to be stable at an
output capacitance of, Cout > 10 mF with an ESR < 300 mW
over the output current range of 10 mA to 1.0 A. For PCB
layout considerations, place the recommended ceramic
capacitor close to the output pin and keep the leads short.
This should help ensure ultra−fast transient response times.
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NCP5661
NCP5661 Evaluation Board
Figure 17. Test Board used for Evaluation
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NCP5661
ORDERING INFORMATION
Device
NCP5661DTADJRKG
Nominal Output Voltage
Package
Adj
(Pb−Free)
NCP5661DT12RKG (Note 3)
Fixed, 1.2 V
(Pb−Free)
NCP5661DT33RKG (Note 3)
Fixed, 3.3 V
(Pb−Free)
Shipping†
2500 Tape & Reel
DPAK
2500 Tape & Reel
2500 Tape & Reel
3. Fixed output voltages available at 0.9 V, 1.5 V, 1.8 V, 2.5 V, 3.0 V per request.
†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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NCP5661
PACKAGE DIMENSIONS
DPAK−5
CENTER LEAD CROP
CASE 175AA−01
ISSUE A
−T−
C
B
V
NOTES:
1. DIMENSIONING AND TOLERANCING
PER ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
SEATING
PLANE
E
R
R1
Z
A
S
DIM
A
B
C
D
E
F
G
H
J
K
L
R
R1
S
U
V
Z
1 2 3 4 5
U
K
F
J
L
H
D 5 PL
G
0.13 (0.005)
M
T
SOLDERING FOOTPRINT*
6.4
0.252
2.2
0.086
0.34 5.36
0.013 0.217
5.8
0.228
10.6
0.417
0.8
0.031
SCALE 4:1
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.
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11
INCHES
MIN
MAX
0.235 0.245
0.250 0.265
0.086 0.094
0.020 0.028
0.018 0.023
0.024 0.032
0.180 BSC
0.034 0.040
0.018 0.023
0.102 0.114
0.045 BSC
0.170 0.190
0.185 0.210
0.025 0.040
0.020
−−−
0.035 0.050
0.155 0.170
MILLIMETERS
MIN
MAX
5.97
6.22
6.35
6.73
2.19
2.38
0.51
0.71
0.46
0.58
0.61
0.81
4.56 BSC
0.87
1.01
0.46
0.58
2.60
2.89
1.14 BSC
4.32
4.83
4.70
5.33
0.63
1.01
0.51
−−−
0.89
1.27
3.93
4.32
NCP5661
The product described herein (NCP5661), 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
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PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
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Literature Distribution Center for ON Semiconductor
USA/Canada
P.O. Box 61312, Phoenix, Arizona 85082−1312 USA
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2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051
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For additional information, please contact your
local Sales Representative.
NCP5661/D