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
µVRMS
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
µs
(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
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1
TSOP–5
SN SUFFIX
CASE 483
PIN CONNECTIONS AND
MARKING DIAGRAM
ON/OFF
GND
NC
1
P28YW
2
3
(Top View)
P28 = Device Code
Y
= Year
W = Work Week
5
V
in
•
Ultra Low–Noise: 150 nV/√Hz @ 100 Hz, 40
µVRMS
100 Hz –
•
•
•
•
•
•
•
100 kHz Typical, Iout = 60 mA, C
o
= 1.0
µF
Fast Response Time from OFF to ON: 40
µs
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
4
V
out
Applications
•
Noise Sensitive Circuits: VCOs RF Stages, etc.
•
Bursting Systems (TDMA Phones)
•
All Battery Operated Devices
ORDERING INFORMATION
Device
NCP4561SNT1–28
Voltge
Output*
2.8 V
Shipping
3000/Tape & Reel
ON/
OFF
NC
1
3
On/Off
Band Gap
Reference
5
Thermal
Shutdown
V
in
* Contact your ON Semiconductor sales
representative for other output voltage values.
4
*Current Limit
*Antisaturation Protection
*Load Transient Improvement
V
out
GND
2
Figure 1. Simplified Block Diagram
©
Semiconductor Components Industries, LLC, 2001
1
June, 2001 – Rev. 1
Publication Order Number:
NCP4561/D
NCP4561
PIN FUNCTION DESCRIPTIONS
Pin #
1
2
3
4
5
Pin Name
ON/OFF
GND
NC
V
out
V
in
Function
Shuts or
wakes–up the IC
The IC’s ground
None
Delivers the
output voltage
Powers the IC
It makes no arm to connect the pin to a known potential, like in a pin–to–pin
replacement case.
This pin requires a 1.0
µF
output capacitor to be stable.
A positive voltage up to 12 V can be applied upon this pin.
Description
A 900 mV level on this pin is sufficient to start the IC. A 150 mV shuts it down.
MAXIMUM RATINGS
Value
Rating
Power Supply Voltage
ESD Capability, HBM Model
ESD Capability, Machine Model
Maximum Power Dissipation
NW Suffix, Plastic Package
Thermal Resistance Junction–to–Air
Operating Ambient Temperature
Maximum Junction Temperature (Note 1.)
Maximum Operating Junction Temperature (Note 2.)
Storage Temperature Range
Pin #
5
All Pins
All Pins
P
D
R
qJ–A
T
A
T
Jmax
T
J
T
stg
Symbol
V
in
Min
–
–
–
–
–
–
–
–
–
Max
12
1.0
200
Internally
Limited
210
–40 to +85
150
125
–60 to +150
Unit
V
kV
V
W
°C/W
°C
°C
ELECTRICAL CHARACTERISTICS
(For Typical Values T
A
= 25°C, for Min/Max values T
A
= –40°C to +85°C, Max T
J
= 125°C unless otherwise noted)
Characteristics
Pin #
Symbol
Min
Typ
Max
Unit
Logic Control Specifications
Input Voltage Range
ON/OFF Input Resistance
ON/OFF Control Voltages (Note 3.)
Logic Zero, OFF State, I
O
= 50 mA
Logic One, ON State, I
O
= 50 mA
1
1
1
V
ON/OFF
R
ON/OFF
V
ON/OFF
–
900
–
–
150
–
0
–
–
250
V
in
–
V
kW
mV
Currents Parameters
Current Consumption in OFF State
OFF Mode Current: V
in
= V
out
+ 1.0 V, I
O
= 0, V
OFF
= 150 mV
Current Consumption in ON State
ON Mode Current: V
in
= V
out
+ 1.0 V, I
O
= 0, V
ON
= 3.5 V
Current Consumption in ON State, ON Mode
Saturation Current: V
in
= V
out
– 0.5 V, No Output Load
Current Limit V
in
= Vout
nom
+ 1.0 V,
Output is brought to Vout
nom
– 0.3 V
1. Internally Limited by Shutdown.
2. Specifications are guaranteed below this value.
3. Voltage Slope should be Greater than 2.0 mV/ms.
IQ
OFF
IQ
ON
IQ
SAT
I
MAX
–
–
–
100
0.1
180
800
180
2.0
–
–
–
mA
mA
mA
mA
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NCP4561
ELECTRICAL CHARACTERISTICS
(continued)
(For Typical Values T
A
= 25°C, for Min/Max values T
A
= –40°C to +85°C, Max T
J
= 125°C unless otherwise noted)
Characteristics
Pin #
Symbol
Min
Typ
Max
Unit
Output Voltages
V
out
+ 1.0 V < V
in
< 6.0 V, T
A
= 25°C, 1.0 mA < I
out
< 80 mA
V
out
+ 1.0 V < V
in
< 6.0 V, T
A
= –40°C to +85°C, 1.0 mA < I
out
< 80 mA
4
4
V
out
V
out
2.758
2.716
2.8
2.8
2.842
2.884
V
V
Line and Load Regulation, Dropout Voltages
Line Regulation
V
out
+ 1.0 V < V
in
< 12 V, I
out
= 80 mA
Load Regulation
V
in
= V
out
+ 1.0 V, C
out
= 1.0
mF,
I
out
= 1.0 to 80 mA
Dropout Voltage (Note 4.)
I
out
= 30 mA
I
out
= 60 mA
I
out
= 80 mA
4/5
4
Reg
line
Reg
load
–
–
–
–
20
40
mV
mV
mV
4
4
4
V
in
–V
out
V
in
–V
out
V
in
–V
out
–
–
–
90
140
160
150
200
250
Dynamic Parameters
Ripple Rejection
V
in
= V
out
+ 1.0 V + 1.0 kHz 100 mVpp Sinusoidal Signal
Output Noise Density @ 1.0 kHz
RMS Output Noise Voltage
C
out
= 1.0
mF,
I
out
= 50 mA, F = 100 Hz to 1.0 MHz
Output Rise Time
C
out
= 1.0
mF,
I
out
= 50 mA, 10% of Rising ON Signal to 90% of
Nominal V
out
4/5
4
4
4
Noise
t
rise
Ripple
–
–
–
–
–70
150
35
40
–
–
–
–
dB
nV/
√Hz
mV
ms
Thermal Shutdown
Thermal Shutdown
4. V
out
is brought to V
out
– 100 mV.
–
–
125
°C
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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.
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.
Output Noise Voltage
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.
Thermal Protection
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
µVRMS.
Maximum Power Dissipation
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 Package Power Dissipation
The maximum total dissipation for which the regulator
will operate within its specs.
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.
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.
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NCP4561
TYPICAL CHARACTERISTICS
6.000
5.500
GROUND CURRENT (mA)
5.000
4.500
4.000
3.500
3.000
2.500
2.000
1.500
1.000
0.500
0.000
0
20
40
60
80
100
OUTPUT CURRENT (mA)
85°C
–40°C
25°C
QUIESCENT CURRENT (µA)
205
210
200
195
190
185
–60
–40
–20
0
20
40
60
80
100
AMBIENT TEMPERATURE (°C)
Figure 2. Ground Current vs. Output Current
Figure 3. Quiescent Current vs. Temperature
2.810
200
85°C
OUTPUT VOLTAGE (V)
DROPOUT (mV)
150
25°C
2.805
2.800
2.795
2.790
2.785
2.780
2.775
2.770
2.765
2.760
00
2.755
–20
40
60
80
100
0
20
40
60
80
100
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
–40°C
25°C
85°C
100
–40°C
50
Figure 4. Dropout vs. Output Current
Figure 5. Output Voltage vs. Output Current
OUTPUT NOISE SPECTRAL DENSITY
180
160
DROPOUT VOLTAGE (mV)
140
120
100
80
60
40
20
0
–60
–40
–20
0
20
40
60
80
100
30 mA
60 mA
80 mA
1000
V
in
= V
out
+ 1
C
out
= 1
µF
I
O
= 10 & 50 mA
NOISE (nV/sqrt Hz)
100
10
RMS Noise
10 Hz to 100 kHz: 36
µV
10 Hz to 1 MHz: 47
µV
1
0.01
0.1
1
10
100
1000
TEMPERATURE (°C)
FREQUENCY (kHz)
Figure 6. Dropout Voltage vs. Temperature
Figure 7. Typical Noise Density Performance
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