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PDF NCP690 Data sheet ( Hoja de datos )
| Número de pieza | NCP690 | |
| Descripción | Very Low Dropout Regulator (VLDO) | |
| Fabricantes | ON Semiconductor | |
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NCP690, NCP691, NCP692
www.Data
1 A, Low IGND, Very Low
Dropout Regulator (VLDO)
with/without Enable
The NCP690, NCP691, NCP692 CMOS LDO family provides 1 A
of output current with enhanced ESD in either fixed voltage options or
an adjustable output voltage from 5.0 V down to 1.25 V. This device is
designed for space constrained and portable battery powered
applications and offer additional features such as high PSRR, low
Quiescent and Ground current consumption, low noise operation,
short circuit and thermal protection. The device is designed to be used
with low cost ceramic capacitors and is packaged in the 6−Lead
DFN3x3 package.
Features
• Output Voltage Options: Adjustable, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V
– Other Options Possible
• Adjustable Output by External Resistors from 5.0 V down to 1.25 V
• Guaranteed 1 A Output Current
• ±1.5% Output Voltage Tolerance over All Operating Conditions
(Adjustable)
• ±2% Output Voltage Tolerance over All Operating Conditions
(Fixed)
• Typical Noise Voltage of 50 mVrms without a Bypass Capacitor
• Typical Dropout Voltage of 190 mV at 1 A (Vout = 2.5 V, TJ = 25°C)
• Active Output Discharge
• Active Low Enable Pin (NCP691 Device)
• Active High Enable Pin (NCP692 device)
• Enhanced ESD: 4 kV and 400 V
Applications
• Laptops and PCI Cards
• Modem Banks and Telecom Boards
• DSP, FPGA, Microprocessor Boards
• Portable, Battery−Power Applications
• Hard Disk Drives
• These are Pb−Free Devices
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DFN6 3x3
MN SUFFIX
1 CASE 506AH
MARKING DIAGRAM
1 xxxzz
AYWW
G
Pb−Free
xxx = 690, 691, 692
zz = 15, 18, 25, 33, 50, AD
A = Assembly Location
Y = Year
WW = Work Week
G = Pb−Free Package
PIN ASSIGNMENT
1
GND
1
GND
NCP690 − 6 PIN DFN
Fixed Version
(Bottom View)
NCP691, NCP692 −
6 PIN DFN
Fixed Version
(Bottom View)
1
GND
1
GND
© Semiconductor Components Industries, LLC, 2009
September, 2009 − Rev. 6
NCP690 − 6 PIN DFN
Adjustable Version
(Bottom View)
NCP691, NCP692 −
6 PIN DFN
Adjustable Version
(Bottom View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
1 Publication Order Number:
NCP690/D
1 page  
NCP690, NCP691, NCP692
Table 3. ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
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Value
Unit
Input Voltage (Note 1)
Chip Enable Voltage
Output Voltage
Output Voltage / Sense Input, (SNS pin)
Electrostatic Discharge
Human Body Model
VIN
VEN
VOUT
VSNS
ESD
−0.3 to 6.5
−0.3 to 6.5
−0.3 to 6.5
−0.3 to 6.5
4000
V
V
V
V
V
Machine Model
400
Maximum Junction Temperature
TJ_MAX
150
_C
Storage Temperature Range
TSTG
−65 to 150
_C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
NOTE:
This device series contains ESD protection and exceeds the following tests:
ESD HBM tested per JEDEC standard: JESD22−A114
ESD MM tested per JEDEC standard: JESD22−A115
Latch–up Current Maximum Rating: ≤ 150 mA per JEDEC standard: JESD78
Table 4. PACKAGE THERMAL CHARACTERISTICS
Rating
Thermal Resistance,
Junction−to−Ambient (Note 2)
DFN6 3x3, 1 oz Cu
DFN6 3x3, 2 oz Cu
Thermal Resistance, Junction−to−Pin
Condition
64 mm2 Cu
645 mm2 Cu
64 mm2 Cu
645 mm2 Cu
Symbol
RqJA
RqJA
RqJL
Value
169
70
151
62
15
Unit
°C/W
°C/W
°C/W
Table 5. OPERATING RANGES
Rating
Symbol
Operating Input Voltage (Notes 3 and 4)
VIN
Operating Junction Temperature Range
TJ
Operating Ambient Temperature Range
TA
1. Minimum VIN = (VOUT + VDO) or 1.5 V, whichever is higher.
2. Soldered on FR4 copper area, please refer to Applications Section for Safe Operating Area.
3. Minimum VIN = (VOUT + VDO) or 1.5 V, whichever is higher.
4. Refer to Electrical Characteristics and Application Information for Safe Operating Area.
Value
1.5 to 6.0
−40 to 125
−40 to 85
Unit
V
°C
°C
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5
5 Page 
NCP690, NCP691, NCP692
DEFINITIONS
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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 100 mV
below its nominal value. The junction temperature, load
current, and minimum input supply requirements affect the
dropout level.
Output Noise Voltage
This is the integrated value of the output noise over a
specified 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 disable current (IDIS.)
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.
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 NCP690 regulator is self−protected with internal
thermal shutdown and internal current limit. Typical
application circuit is shown in Figure 1.
Input Decoupling (CIN)
A ceramic 10 mF capacitor is recommended and should be
connected close to the NCP690 package. Higher
capacitance and lower ESR will improve the overall line
transient response.
Output Decoupling (COUT)
The NCP690 does not require a minimum Equivalent
Series Resistance (ESR) for the output capacitor. The
minimum output decoupling capacitor required for stability
is 1 mF. In order to improve the load transient response and
start up performance 10 mF capacitor is recommended. The
regulator is stable with ceramic chip as well as tantalum
capacitors. Larger values improve noise rejection and load
transient response.
No−Load Regulation Considerations
The required minimum 100 mA load current is assured by
the internal resistor divider network.
The NCP690 contain 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,
Noise Decoupling
The NCP690 is a low noise regulator and needs no
external noise reduction capacitor. Unlike other low noise
regulators which require an external capacitor and have slow
startup times, the NCP690 operates without a noise
reduction capacitor, has a typical 50 ms turn−on time and
achieves a 50 mVrms overall noise level between 10 Hz and
100 kHz.
Enable Operation
The enable pin will turn the regulator on or off. The
threshold limits are covered in the electrical characteristics
table in this data sheet. The turn−on/turn−off transient
voltage being supplied to the enable pin should exceed a
slew rate of 10 mV/ms to ensure correct operation. If the
enable function is not to be used then the pin should be
connected to VIN.
Adjustable Operation
The output voltage can be adjusted from 1 to 4 times the
typical 1.250 V regulation voltage by the use of resistor
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCP690.PDF ] | |
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