ONSEMI NCP4561SN28T1

NCP4561
Ultra Low-Noise Low
Dropout Voltage Regulator
with 1.0 V ON/OFF Control
The NCP4561 is a Low DropOut (LDO) regulator featuring
excellent noise performances. Thanks to its innovative concept, the
circuit reaches an incredible 40 VRMS noise level without an
external bypass capacitor. Housed in a small SOT–23 5 leads–like
package, it represents the ideal designer’s choice when space and
noise are at premium.
The absence of external bandgap capacitor unleashes the response
time to a wake–up signal and makes it stay within 40 s (in repetitive
mode), pushing the NCP4561 as a natural candidate in portable
applications.
The NCP4561 also hosts a novel architecture which prevents
excessive undershoots when the regulator is the seat of fast transient
bursts, as in any bursting systems.
Finally, with a static line regulation better than –75 dB, it naturally
shields the downstream electronics against choppy lines.
Features
• Ultra Low–Noise: 150 nV/√Hz @ 100 Hz, 40 VRMS 100 Hz –
•
•
•
•
•
•
5
1
TSOP–5
SN SUFFIX
CASE 483
PIN CONNECTIONS AND
MARKING DIAGRAM
ON/OFF
1
GND
2
NC
3
5
Vin
4
Vout
P28YW
•
100 kHz Typical, Iout = 60 mA, Co = 1.0 F
Fast Response Time from OFF to ON: 40 s Typical at a 200 Hz
Repetition Rate
Ready for 1.0 V Platforms: ON with a 900 mV High Level
Nominal Output Current of 80 mA with a 100 mA Peak Capability
Typical Dropout of 90 mV @ 30 mA, 160 mV @ 80 mA
Ripple Rejection: 70 dB @ 1.0 kHz
1.5% Output Precision @ 25°C
Thermal Shutdown
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(Top View)
P28 = Device Code
Y
= Year
W = Work Week
Applications
• Noise Sensitive Circuits: VCOs RF Stages, etc.
• Bursting Systems (TDMA Phones)
• All Battery Operated Devices
ON/
OFF
1
NC
3
GND
2
On/Off
ORDERING INFORMATION
5
Vin
4
Vout
Device
Voltage
Output*
Shipping
NCP4561SN28T1
2.8 V
3000/Tape & Reel
* Contact your ON Semiconductor sales
representative for other output voltage values.
Thermal
Shutdown
Band Gap
Reference
*Current Limit
*Antisaturation Protection
*Load Transient Improvement
Figure 1. Simplified Block Diagram
 Semiconductor Components Industries, LLC, 2002
May, 2002 – Rev. 2
1
Publication Order Number:
NCP4561/D
NCP4561
PIN FUNCTION DESCRIPTIONS
Pin #
Pin Name
Function
Description
1
ON/OFF
Shuts or
wakes–up the IC
2
GND
The IC’s ground
3
NC
None
It makes no arm to connect the pin to a known potential, like in a pin–to–pin
replacement case.
4
Vout
Delivers the
output voltage
This pin requires a 1.0 F output capacitor to be stable.
5
Vin
Powers the IC
A positive voltage up to 12 V can be applied upon this pin.
A 900 mV level on this pin is sufficient to start the IC. A 150 mV shuts it down.
MAXIMUM RATINGS
Value
Rating
Pin #
Symbol
Min
Max
Unit
5
Vin
–
12
V
–
1.0
kV
Power Supply Voltage
ESD Capability, HBM Model
All Pins
ESD Capability, Machine Model
All Pins
–
200
V
Maximum Power Dissipation
NW Suffix, Plastic Package
Thermal Resistance Junction–to–Air
PD
–
W
RJ–A
–
Internally
Limited
210
Operating Ambient Temperature
Maximum Junction Temperature (Note 1)
Maximum Operating Junction Temperature (Note 2)
TA
TJmax
TJ
–
–
–
–40 to +85
150
125
°C
Tstg
–
–60 to +150
°C
Storage Temperature Range
°C/W
ELECTRICAL CHARACTERISTICS
(For Typical Values TA = 25°C, for Min/Max values TA = –40°C to +85°C, Max TJ = 125°C unless otherwise noted)
Pin #
Symbol
Min
Typ
Max
Unit
Input Voltage Range
1
VON/OFF
0
–
Vin
V
ON/OFF Input Resistance
1
RON/OFF
–
250
–
k
ON/OFF Control Voltages (Note 3)
Logic Zero, OFF State, IO = 50 mA
Logic One, ON State, IO = 50 mA
1
VON/OFF
–
900
–
–
150
–
Characteristics
Logic Control Specifications
mV
Currents Parameters
Current Consumption in OFF State
OFF Mode Current: Vin = Vout + 1.0 V, IO = 0, VOFF = 150 mV
IQOFF
–
0.1
2.0
A
Current Consumption in ON State
ON Mode Current: Vin = Vout + 1.0 V, IO = 0, VON = 3.5 V
IQON
–
180
–
A
Current Consumption in ON State, ON Mode
Saturation Current: Vin = Vout – 0.5 V, No Output Load
IQSAT
–
800
–
A
Current Limit Vin = Voutnom + 1.0 V,
Output is brought to Voutnom – 0.3 V
IMAX
100
180
–
mA
1. Internally Limited by Shutdown.
2. Specifications are guaranteed below this value.
3. Voltage Slope should be Greater than 2.0 mV/s.
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NCP4561
ELECTRICAL CHARACTERISTICS (continued)
(For Typical Values TA = 25°C, for Min/Max values TA = –40°C to +85°C, Max TJ = 125°C unless otherwise noted)
Characteristics
Pin #
Symbol
Min
Typ
Max
Unit
Vout + 1.0 V < Vin < 6.0 V, TA = 25°C, 1.0 mA < Iout < 80 mA
4
Vout
2.758
2.8
2.842
V
Vout + 1.0 V < Vin < 6.0 V, TA = –40°C to +85°C, 1.0 mA < Iout < 80 mA
4
Vout
2.716
2.8
2.884
V
4/5
Regline
–
–
20
mV
4
Regload
–
–
40
mV
4
4
4
Vin–Vout
Vin–Vout
Vin–Vout
–
–
–
90
140
160
150
200
250
4/5
Ripple
–
–70
–
dB
–
150
–
nV/
√Hz
Output Voltages
Line and Load Regulation, Dropout Voltages
Line Regulation
Vout + 1.0 V < Vin < 12 V, Iout = 80 mA
Load Regulation
Vin = Vout + 1.0 V, Cout = 1.0 F, Iout = 1.0 to 80 mA
Dropout Voltage (Note 4)
Iout = 30 mA
Iout = 60 mA
Iout = 80 mA
mV
Dynamic Parameters
Ripple Rejection
Vin = Vout + 1.0 V + 1.0 kHz 100 mVpp Sinusoidal Signal
Output Noise Density @ 1.0 kHz
4
RMS Output Noise Voltage
Cout = 1.0 F, Iout = 50 mA, F = 100 Hz to 1.0 MHz
4
Noise
–
35
–
V
Output Rise Time
Cout = 1.0 F, Iout = 50 mA, 10% of Rising ON Signal to 90% of
Nominal Vout
4
trise
–
40
–
s
–
–
125
°C
Thermal Shutdown
Thermal Shutdown
4. Vout is brought to Vout – 100 mV.
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NCP4561
DEFINITIONS
Load Regulation
Line Regulation
The change in output voltage for a change in output
current at a constant chip temperature.
The change in output voltage for a change in input voltage.
The measurement is made under conditions of low
dissipation or by using pulse technique such that the average
chip temperature is not significantly affected. One usually
distinguishes static line regulation or DC line regulation (a
DC step in the input voltage generates a corresponding step
in the output voltage) from ripple rejection or audio
susceptibility where the input is combined with a frequency
generator to sweep from a few hertz up to a defined
boundary while the output amplitude is monitored.
Dropout Voltage
The input/output differential at which the regulator output
no longer maintains regulation against further reductions in
input voltage. Measured when the output drops 100 mV
below its nominal value (which is measured at 1.0 V
differential value). The dropout level is affected by the chip
temperature, load current and minimum input supply
requirements.
Thermal Protection
Output Noise Voltage
This is the integrated value of the output noise over a
specified frequency range. Input voltage and output current
are kept constant during the measurement. Results are
expressed in VRMS.
Internal thermal shutdown circuitry is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated at typically 125°C,
the regulator turns off. This feature is provided to prevent
catastrophic failures from accidental overheating.
Maximum Power Dissipation
Maximum Package Power Dissipation
The maximum total dissipation for which the regulator
will operate within its specs.
The maximum power package power dissipation is the
power dissipation level at which the junction temperature
reaches its maximum operating value, i.e. 125°C.
Depending on the ambient temperature, it is possible to
calculate the maximum power dissipation and thus the
maximum available output current.
Quiescent Current
The quiescent current is the current which flows through
the ground when the LDO operates without a load on its
output: internal IC operation, bias, etc. When the LDO
becomes loaded, this term is called the Ground current. It is
actually the difference between the input current (measured
through the LDO input pin) and the output current.
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NCP4561
TYPICAL CHARACTERISTICS
6.000
210
QUIESCENT CURRENT (A)
GROUND CURRENT (mA)
5.500
5.000
4.500
4.000
–40°C
25°C
3.500
3.000
2.500
85°C
2.000
1.500
1.000
0.500
0.000
0
20
40
80
60
100
205
200
195
190
185
–60
–40
–20
0
20
40
60
80
100
OUTPUT CURRENT (mA)
AMBIENT TEMPERATURE (°C)
Figure 2. Ground Current vs. Output Current
Figure 3. Quiescent Current vs. Temperature
2.810
200
2.805
150
OUTPUT VOLTAGE (V)
DROPOUT (mV)
85°C
25°C
100
–40°C
50
85°C
2.800
2.795
25°C
2.790
2.785
2.780
–40°C
2.775
2.770
2.765
2.760
2.755
00
–20
40
60
80
0
100
20
40
60
80
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
Figure 4. Dropout vs. Output Current
Figure 5. Output Voltage vs. Output Current
100
OUTPUT NOISE SPECTRAL DENSITY
180
1000
140
NOISE (nV/sqrt Hz)
DROPOUT VOLTAGE (mV)
Vin = Vout + 1
Cout = 1 F
IO = 10 & 50 mA
80 mA
160
120
60 mA
100
80
30 mA
60
40
100
10
RMS Noise
10 Hz to 100 kHz: 36 V
10 Hz to 1 MHz: 47 V
20
0
–60
–40
–20
0
20
40
60
80
1
0.01
100
0.1
1
10
100
1000
FREQUENCY (kHz)
TEMPERATURE (°C)
Figure 6. Dropout Voltage vs. Temperature
Figure 7. Typical Noise Density Performance
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NCP4561
POWER SUPPLY REJECTION RATIO
Mag (dB)
Vin = Vout + 1
Cout = 1 F
Iload = 10 mA
–7.50
–15.00
PSSR (dB)
–22.50
–30.00
–37.50
–45.00
–52.50
–60.00
–67.50
10
100
1k
10 k
100 k
1M
FREQUENCY (Hz)
Figure 8. Typical Ripple Rejection Performance
(Iload = 10 mA)
POWER SUPPLY REJECTION RATIO
Mag (dB)
Vin = Vout + 1
Cout = 1 F
Iload = 60 mA
–7.50
–15.00
PSSR (dB)
–22.50
–30.00
–37.50
–45.00
–52.50
–60.00
–67.50
10
100
1k
10 k
100 k
1M
FREQUENCY (Hz)
Figure 9. Typical Ripple Rejection Performance
(Iload = 60 mA)
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NCP4561
APPLICATION HINTS
Input Decoupling
Protections
As with any regulator, it is necessary to reduce the
dynamic impedance of the supply rail that feeds the
component. A 1.0 F capacitor either ceramic or tantalum is
recommended and should be connected close to the
NCP4561 package. Higher values will correspondingly
improve the overall line transient response.
The NCP4561 hosts several protections, giving natural
ruggedness and reliability to the products implementing the
component. The output current is internally limited to a
maximum value of 180 mA typical while temperature
shutdown occurs if the die heats up beyond 125°C. These
values let you assess the maximum differential voltage the
device can sustain at a given output current before its
protections come into play.
The maximum dissipation the package can handle is given
by:
Output Decoupling
Thanks to a novel concept, the NCP4561 is a stable
component and does not require any specific Equivalent
Series Resistance (ESR) neither a minimum output current.
Capacitors exhibiting ESRs ranging from a few m up to
3.0 can thus safely be used. The minimum decoupling
value is 1.0 F and can be augmented to fulfill stringent load
transient requirements. The regulator accepts ceramic chip
capacitors as well as tantalum devices.
T
T
A
P max Jmax
R
JA
If TJmax is limited to 125°C, then the NCP4561 can
dissipate up to 470 mW @ 25°C. The power dissipated by
the NCP4561 can be calculated from the following formula:
Noise Decoupling
Ptot V
Unlike other LDOs, the NCP4561 is a true low–noise
regulator. Without the need of an external bypass capacitor,
it typically reaches the incredible level of 40 VRMS overall
noise between 100 Hz and 100 kHz. To give maximum
insight on noise specifications, ON Semiconductor includes
spectral density graphics. The classical bypass capacitor
impacts the start–up phase of standard LDOs. However,
thanks to its low–noise architecture, the NCP4561 operates
without a bypass element and thus offers a typical 40 s
start–up phase.
in
I
(I ) V V out I out
gnd out
in
or
Vin max Ptot V out I out
I
gnd
I out
If a 80 mA output current is needed, the ground current is
extracted from the data–sheet curves: 4.0 mA @ 80 mA. For
a NCP4561SN28T1 (2.8 V) delivering 80 mA and operating
at 25°C, the maximum input voltage will then be 8.3 V.
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NCP4561
Typical Applications
The following figure portrays the typical application of the NCP4561.
Dropout
Charge
SW*
4
Output
5
Input
3
1
+
2
NCP4561
C3
1.0 F
+
C2
1.0 F
R1
100 k
On/Off
*Enables the IC When Closed
Figure 10. A Typical Application Schematic
PCB Layout Considerations
inductances/capacitances are minimized. This layout is the
basis for the NCP4561 performance evaluation board. The
BNC connectors give the user an easy and quick evaluation
mean.
As for any low noise designs, particular care has to be
taken when tackling Printed Circuit Board (PCB) layout.
The figure below gives an example of a layout where stray
ON SEMICONDUCTOR
NCP4561 EVALUATION BOARD
DROPOUT
+
IN
_
+
OUT
_
ON Semiconductor
NCP4561 EVALUATION BOARD
OUT
OFF
ON
IN
ON/OFF
Figure 11. PCB Layout
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NCP4561
Understanding the Load Transient Improvement
During this decreasing phase, the LDO stops the PNP bias
and one can consider the LDO asleep. If by misfortune a
current shot appears, the reaction time is incredibly
lengthened and a strong undershoot takes place. This
reaction is clearly not acceptable for line sensitive devices,
such as VCOs or other Radio–Frequency parts. This
problem is dramatically exacerbated when the output
current drops to zero rather than a few mA. In this later case,
the internal feedback network is the only discharge path,
accordingly lengthening the output voltage decay period.
The NCP4561 cures this problem by implementing a
clever design where the LDO detects the presence of the
overshoot and forces the system to go back to steady–state
as soon as possible, ready for the next shot, which positively
improves the response time and decreases the negative peak
voltage.
The NCP4561 features a novel architecture which allows
the user to easily implement the regulator in burst systems
where the time between two current shots is kept very small.
The quality of the transient response time is related to
many parameters, among which the closed–loop bandwidth
with the corresponding phase margin plays an important
role. However, other characteristics also come into play like
the series pass transistor saturation. When a current
perturbation suddenly appears on the output, e.g. a load
increase, the error amplifier reacts and actively biases the
PNP transistor. During this reaction time, the LDO is in
open–loop and the output impedance is rather high. As a
result, the voltage brutally drops until the error amplifier
effectively closes the loop and corrects the output error.
When the load disappears, the opposite phenomenon takes
place with a positive overshoot. The problem appears when
this overshoot decays down to the LDO steady–state value.
NCP4561 has a fast start–up phase
unacceptable level. NCP4561 offers the best of both worlds
since it no longer includes a bypass capacitor and starts in
less than 40 s typically (Repetitive at 200 Hz). It also
ensures a low–noise level of 40 VRMS 100 Hz–100 kHz.
The following picture details the typical NCP4561 startup
phase.
Thanks to the lack of bypass capacitor the NCP4561 is
able to supply its downstream circuitry as soon as the OFF
to ON signal appears. In a standard LDO, the charging time
of the external bypass capacitor hampers the response time.
A simple solution consists in suppressing this bypass
element but, unfortunately, the noise rises to an
Tek Run: 5.00 MS/s
Sample
Vout
500 mV/div
C4 High
2.78 V
C4 Mean
2.426 V
ON/OFF Pin Voltage
1 V/div
Ch3 1.00 V
Ch4 500 mV
M 10.0 s Ch3
1.82 V
(Conditions: Vin = 3.8 V, Iload = 10 mA, Cout = 1 F)
Figure 12. Start–Up Waveform
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NCP4561
TYPICAL TRANSIENT RESPONSES
Tek Run: 1.00 MS/s
Sample
Vout
200 mV/div
C4 Max
2.800 V
C4 Mean
2.7840 V
C4 Min
2.720 V
Iload
20 mA/div
Ch2 20.0 mV M 50.0 s Ch2
Ch4 200 mV
38.4 mV
(Conditions: Vin = 3.8 V, Cout = 1 F)
Figure 13. Load Current is Pulsed from 0 to 40 mA
Sample
Tek Run: 1.00 MS/s
Vout 200 mV/div
C4 Max
2.844 V
C4 Mean
2.7852 V
C4 Min
2.708 V
Iload
20 mA/div
Ch1 20.0 mV
Ch4 200 mV
M 50.0 s Ch1
78.8 mV
(Conditions: Vin = 3.8 V, Cout = 1 F)
Figure 14. Load Current is Pulsed from 0 to 80 mA
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NCP4561
TYPICAL TRANSIENT RESPONSES
Tek Run: 1.00 MS/s
Sample
Vout
200 mV/div
C4 Max
2.824 V
C4 Mean
2.7848 V
C4 Mean
2.776 V
Iload
20 mA/div
Ch2 20.0 mV M 50.0 s Ch2
Ch4 200 mV
38.4 mV
(Conditions: Vin = 3.8 V, Cout = 1 F)
Figure 15. Load Current is Switched from 40 to 0 mA
Tek Stop: 1.00 MS/s
1930 Acgs
Vout 200 mV/div
C4 Max
2.844 V
C4 Mean
2.7848 V
C4 Min
2.708 V
Iload
20 mA/div
Ch1 20.0 mV
Ch4 200 mV
M 50.0 s Ch1
0V
(Conditions: Vin = 3.8 V, Cout = 1 F)
Figure 16. Load Current is Switched from 80 to 0 mA
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NCP4561
MINIMUM RECOMMENDED FOOTPRINT FOR SURFACE MOUNTED APPLICATIONS
Surface mount board layout is a critical portion of the
total design. The footprint for the semiconductor packages
must be the correct size to insure proper solder connection
interface between the board and the package. With the
correct pad geometry, the packages will self align when
subjected to a solder reflow process.
0.094
2.4
0.037
0.95
0.074
1.9
0.037
0.95
0.028
0.7
0.039
1.0
inches
mm
TSOP–5
(TSOP–5 is footprint compatible with SOT23–5)
ORDERING INFORMATION
Device
NCP4561SN28T1
Voltage Output*
Package
Shipping
2.8 V
TSOP–5
3000 Units /Tape & Reel
*Contact your ON Semiconductor sales representative for other output voltage values.
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NCP4561
PACKAGE DIMENSIONS
TSOP–5
SN SUFFIX
PLASTIC PACKAGE
CASE 483–01
ISSUE B
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. MAXIMUM LEAD THICKNESS INCLUDES LEAD
FINISH THICKNESS. MINIMUM LEAD THICKNESS
IS THE MINIMUM THICKNESS OF BASE
MATERIAL.
D
S
5
4
1
2
3
B
L
G
A
J
C
0.05 (0.002)
H
M
K
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DIM
A
B
C
D
G
H
J
K
L
M
S
MILLIMETERS
MIN
MAX
2.90
3.10
1.30
1.70
0.90
1.10
0.25
0.50
0.85
1.05
0.013
0.100
0.10
0.26
0.20
0.60
1.25
1.55
0
10 2.50
3.00
INCHES
MIN
MAX
0.1142 0.1220
0.0512 0.0669
0.0354 0.0433
0.0098 0.0197
0.0335 0.0413
0.0005 0.0040
0.0040 0.0102
0.0079 0.0236
0.0493 0.0610
0
10 0.0985 0.1181
NCP4561
Notes
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NCP4561
Notes
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NCP4561
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
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Email: [email protected]
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Phone: 81–3–5740–2700
Email: [email protected]
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For additional information, please contact your local
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NCP4561/D