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PDF NCP623 Data sheet ( Hoja de datos )
| Número de pieza | NCP623 | |
| Descripción | Ultra Low Noise 150 mA Low Dropout Voltage Regulator with ON/OFF Control | |
| Fabricantes | ON | |
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NCP623
Ultra Low Noise
150 mA Low Dropout
Voltage Regulator with
ON/OFF Control
Housed in a Micro8t or QFN6 package, the NCP623 delivers up to
150 mA where it exhibits a typical 180 mV dropout. With an
incredible noise level of 25 mVRMS (over 100 Hz to 100 kHz, with a
10 nF bypass capacitor), the NCP623 represents the ideal choice for
sensitive circuits, especially in portable applications where noise
performance and space are premium. The NCP623 also excels in
response time and reacts in less than 25 ms when receiving an OFF to
ON signal (with no bypass capacitor).
Due to a novel concept, the NCP623 accepts output capacitors without
any restrictions regarding their Equivalent Series Resistance (ESR) thus
offering an obvious versatility for immediate implementation.
With a typical DC ripple rejection better than −90 dB (−70 dB @
1.0 kHz), it naturally shields the downstream electronics against
choppy power lines.
Additionally, thermal shutdown and short−circuit protection
provide the final product with a high degree of ruggedness.
Features
• Very Low Quiescent Current 170 mA (ON, no load), 100 nA
(OFF, no load)
• Very Low Dropout Voltage, Typical Value is 137 mV at an Output
Current of 100 mA
• Very Low Noise with External Bypass Capacitor (10 nF),
Typically 25 mVrms over 100 Hz to 100 kHz
• Internal Thermal Shutdown
• Extremely Tight Line Regulation Typically −90 dB
• Ripple Rejection −70 dB @ 1.0 kHz
• Line Transient Response: 1.0 mV for DVin = 3.0 V
• Extremely Tight Load Regulation, Typically 20 mV at DIout = 150 mA
• Multiple Output Voltages Available
• Logic Level ON/OFF Control (TTL−CMOS Compatible)
• ESR can vary from 0 to 3.0 W
Applications
• All Portable Systems, Battery Powered Systems, Cellular
Telephones, Radio Control Systems, Toys and Low Voltage Systems
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MARKING
DIAGRAMS
8
Micro8
DM SUFFIX
CASE 846A
XXX
AYW
1
1
QFN6, 3X3
NCP6
MN SUFFIX
23yy
1
CASE 488AE
ALYW
XXX
yy
A
L
Y
W
= Specific Device Code
= Voltage Option
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
Bypass
NC
NC
ON/OFF
18
27
36
45
Micro8
(Top View)
VOUT
GND
GND
VIN
VIN
GND
VOUT
16
25
34
ON/OFF
GND
Bypass
QFN6
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information on page 12 of
this data sheet.
© Semiconductor Components Industries, LLC, 2004
August, 2004 − Rev. 0
1
Publication Order Number:
NCP623/D
1 page  
NCP623
APPLICATION HINTS
Input Decoupling − As with any regulator, it is necessary
to reduce the dynamic impedance of the supply rail that
feeds the component. A 1.0 mF capacitor either ceramic or
tantalum is recommended and should be connected close to
the NCP623 package. Higher values will correspondingly
improve the overall line transient response.
Output Decoupling − Due to a novel concept, the
NCP623 is a stable component and does not require any
Equivalent Series Resistance (ESR) neither a minimum
output current. Capacitors exhibiting ESRs ranging from a
few mW up to 3.0 W can thus safely be used. The minimum
decoupling value is 1.0 mF and can be augmented to fulfill
stringent load transient requirements. The regulator accepts
ceramic chip capacitors as well as tantalum devices.
Noise Performances − Unlike other LDOs, the NCP623
is a true low−noise regulator. With a 10 nF bypass capacitor,
it typically reaches the incredible level of 25 mVRMS overall
noise between 100 Hz and 100 kHz. To give maximum
insight on noise specifications, ON Semiconductor includes
spectral density graphics as well as noise dependency versus
bypass capacitor.
The bypass capacitor impacts the start−up phase of the
NCP623 as depicted by the data−sheet curves. A typical
1.0 ms settling time is achieved with a 10 nF bypass
capacitor. However, due to its low−noise architecture, the
NCP623 can operate without bypass and thus offers a typical
20 ms start−up phase. In that case, the typical output noise
stays lower than 65 mVRMS between 100 Hz − 100 kHz.
Protections − The NCP623 hosts several protections,
conferring natural ruggedness and reliability to the products
implementing the component. The output current is
internally limited to a minimum of 175 mA while
temperature shutdown occurs if the die heats up beyond
150°C. These value lets 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:
Pmax
+
TJmax –
RqJA
TA
If TJmax is internally limited to 150°C, then the NCP623 can
dissipate up to 595 mW @ 25°C.
The power dissipated by the NCP623 can be calculated
from the following formula:
Ptot + ǀVin @ Ignd(Iout)ǁ ) ǀVin * Vout ǁ @ Iout
or
Vinmax
+
Ptot ) Vout @ Iout
Ignd ) Iout
If a 150 mA output current is needed, the ground current
is extracted from the data−sheet curves: 6.5 mA @ 150 mA.
For a NCP623NW28R2 (2.8 V), the maximum input voltage
will then be 6.48 V, a rather comfortable margin.
Typical Application − The following figure portraits the
typical application for the NCP623 where both input/output
decoupling capacitors appear.
On/Off
C1
10 nF
654
C3
1.0 mF
NCP623
1 23
C2
1.0 mF
Input
Output
Figure 2. A Typical NCP623 Application with
Recommended Capacitor Values (QFN6)
Output
Input
87 6 5
C2
1.0 mF
NCP623
C3
1.0 mF
1
C1
10 nF
234
NC NC
On/Off
Figure 3. A Typical NCP623 Application with
Recommended Capacitor Values (Micro8)
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5
5 Page 
NCP623
TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage
250 250
150 mA
200 200
85°C
100 mA
150
25°C
150
−40°C
60 mA
100 100
50
0
10 60 100
IO (mA)
Figure 22. Dropout Voltage versus Iout
150
50 10 mA
0
−40 −20 0 20 40 60 80 100
TEMPERATURE (°C)
Figure 23. Dropout Voltage versus Temperature
Output Voltage
2.805
2.860
2.800
1 mA
2.840
2.795
2.790
2.785
2.780
60 mA
100 mA
150 mA
2.820
2.800
2.780
2.775
2.760
2.770
−40 −20
0 20 40 60
TEMPERATURE (°C)
2.740
80 100
0
Figure 24. Output Voltage versus Temperature
25°C −40°C
85°C
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
Figure 25. Output Voltage versus Iout
160
Ripple Rejection Performances
0
−10 Vin = 3.8 V
−20 Vout = 2.8 V
−30 CO = 1.0 mF
Iout = 60 mA
−40 Tamb = 25°C
−50
−60
−70
−80
−90
−100
100
1000
10,000
0
Vin = 3.8 V
−20 Vout = 2.8 V
CO = 1.0 mF
−40 Iout = 60 mA
Tamb = 25°C
−60
−80
−100
−120
100,000
10
100
1000
10,000 100,000 1,000,000
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 26. Ripple Rejection versus Frequency with
10 nF Bypass Capacitor
Figure 27. Ripple Rejection versus Frequency
without Bypass Capacitor
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11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCP623.PDF ] | |
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