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PDF NCP603 Data sheet ( Hoja de datos )
| Número de pieza | NCP603 | |
| Descripción | 300 mA High Performance CMOS LDO Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCP603
Product Preview
300 mA High Performance
CMOS LDO Regulator with
Enable and Enhanced ESD
Protection
The NCP603 provides 300 mA of output current at fixed voltage
options, or an adjustable output voltage from 5.0 V down to 1.250 V. It
www.DataSheet4iUs .dceosmigned for portable battery powered applications and offers high
performance features such as low power operation, fast enable
response time, and low dropout.
The device is designed to be used with low cost ceramic capacitors
and is packaged in the TSOP-5/SOT23-5.
Features
•ăOutput Voltage Options:
Adjustable, 1.3 V, 1.5 V, 1.8 V, 2.8 V, 3.0 V, 3.3 V, 3.5 V, 5.0 V
•ăAdjustable Output by External Resistors from 5.0 V down to 1.250 V
•ăFast Enable Turn-on Time of 15 ms
•ăWide Supply Voltage Range Operating Range
•ăExcellent Line and Load Regulation
•ăTypical Noise Voltage of 50 mVrms without a Bypass Capacitor
•ăEnhanced ESD Protection (HBM 3.5 kV, MM 400 V)
•ăThese are Pb-Free Devices
Typical Applications
•ăSMPS Post-Regulation
•ăHand-held Instrumentation & Audio Players
•ăNoise Sensitive Circuits – VCO, RF Stages, etc.
•ăCamcorders and Cameras
•ăPortable Computing
VIN VOUT
Fixed Voltage Only
GND
Driver w/
Current Limit
Thermal
Shutdown
+
-
+
-1.25 V
Adjustable Version Only
ADJ
ENABLE
Figure 1. Simplified Block Diagram
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
http://onsemi.com
5
1
TSOP-5
SN SUFFIX
CASE 483
MARKING DIAGRAM
5
xxx AYWG
G
1
xxx = Specific Device Code
A = Assembly Location
Y = Year
W = Work Week
G = Pb-Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
Vin 1
GND 2
ENABLE 3
5 Vout
4 ADJ/NC*
(Top View)
* ADJ - Adjustable Version
* NC - Fixed Voltage Version
ORDERING INFORMATION
See detailed ordering and shipping information in the
package dimensions section on page 12 of this data sheet.
©Ă Semiconductor Components Industries, LLC, 2007
November, 2007 - Rev. P1
1
Publication Order Number:
NCP603/D
1 page  
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NCP603
VIN
CIN
ENABLE
1
2
3
5 VOUT
COUT
4
Figure 2. Typical Application Circuit for Vout = 1.250 V
(Adjustable Version)
VIN
CIN
ENABLE
1
2
3
5
R1
4
VOUT
COUT
R2
Figure 3. Typical Application Circuit for Adjustable Vout
VIN
CIN
1
2
3
5 VOUT
COUT
4
Figure 4. Typical Application Circuit
(Fixed Voltage Version)
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5
5 Page 
NCP603
DEFINITIONS
Load Regulation
The change in output voltage for a change in output load
current at a constant 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 2% below its
nominal. The junction temperature, load current, and
minimum input supply requirements affect the dropout level.
Line Regulation
The change in output voltage for a change in input voltage.
The measurement is made under conditions of low
dissipation or by using pulse techniques such that the
average junction temperature is not significantly affected.
Line Transient Response
Typical output voltage overshoot and undershoot
response when the input voltage is excited with a given
slope.
Output Noise Voltage
This is the integrated value of the output noise over a
www.DataSheet4sUp.eccoimfied frequency range. Input voltage and output load
current are kept constant during the measurement. Results
are expressed in mVrms or nV √ Hz.
Ground Current
Ground Current is the current that flows through the
ground pin when the regulator operates without a load on its
output (IGND). This consists of internal IC operation, bias,
etc. It is actually the difference between the input current
(measured through the LDO input pin) and the output load
current. If the regulator has an input pin that reduces its
internal bias and shuts off the output (enable/disable
function), this term is called the standby current (ISTBY.)
Load Transient Response
Typical output voltage overshoot and undershoot
response when the output current is excited with a given
slope between no-load and full-load conditions.
Thermal Protection
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 175°C,
the regulator turns off. This feature is provided to prevent
failures from accidental overheating.
Maximum Package Power Dissipation
The power dissipation level at which the junction
temperature reaches its maximum operating value.
APPLICATIONS INFORMATION
The NCP603 series regulator is self-protected with
internal thermal shutdown and internal current limit. Typical
application circuits are shown in Figures 2 and 3.
Input Decoupling (Cin)
A ceramic or tantalum 1.0 mF capacitor is recommended
and should be connected close to the NCP603 package.
Higher capacitance and lower ESR will improve the overall
line transient response.
Output Decoupling (Cout)
The NCP603 is a stable component and does not require
a minimum Equivalent Series Resistance (ESR) for the
output capacitor. The minimum output decoupling value is
1.0 mF and can be augmented to fulfill stringent load
transient requirements. The regulator works with ceramic
chip capacitors as well as tantalum devices. Larger values
improve noise rejection and load regulation transient
response. Figure 28 shows the stability region for a range of
operating conditions and ESR values.
No-Load Regulation Considerations
The NCP603 adjustable regulator will operate properly
under conditions where the only load current is through the
resistor divider that sets the output voltage. However, in the
case where the NCP603 is configured to provide a 1.250 V
output, there is no resistor divider. If the part is enabled
under no-load conditions, leakage current through the pass
transistor at junction temperatures above 85°C can approach
several microamperes, especially as junction temperature
approaches 150°C. If this leakage current is not directed into
a load, the output voltage will rise up to a level
approximately 20 mV above nominal.
The NCP603 contains an overshoot clamp circuit to
improve transient response during a load current step
release. When output voltage exceeds the nominal by
approximately 20 mV, this circuit becomes active and
clamps the output from further voltage increase. Tying the
ENABLE pin to Vin will ensure that the part is active
whenever the supply voltage is present, thus guaranteeing
that the clamp circuit is active whenever leakage current is
present.
When the NCP603 adjustable regulator is disabled, the
overshoot clamp circuit becomes inactive and the pass
transistor leakage will charge any capacitance on Vout. If no
load is present, the output can charge up to within a few
millivolts of Vin. In most applications, the load will present
some impedance to Vout such that the output voltage will be
inherently clamped at a safe level. A minimum load of
10ĂmA is recommended.
http://onsemi.com
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| PDF Descargar | [ Datasheet NCP603.PDF ] | |
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