LM185-1.2/LM285-1.2/LM385-1.2
Micropower Voltage Reference Diode
General Description
The LM185-1.2/LM285-1.2/LM385-1.2 are micropower 2-terminal
band-gap voltage regulator diodes. Operating over a
10μA to 20mA current range, they feature exceptionally low
dynamic impedance and good temperature stability. On-chip
trimming is used to provide tight voltage tolerance. Since the
LM185-1.2 band-gap reference uses only transistors and resistors,
low noise and good long term stability result.
Careful design of the LM185-1.2 has made the device exceptionally
tolerant of capacitive loading, making it easy to use in
almost any reference application. The wide dynamic operating
range allows its use with widely varying supplies with
excellent regulation.
The extremely low power drain of the LM185-1.2 makes it
useful for micropower circuitry. This voltage reference can be
used to make portable meters, regulators or general purpose
analog circuitry with battery life approaching shelf life.
Further, the wide operating current allows it to replace older
references with a tighter tolerance part.
The LM185-1.2 is rated for operation over a −55°C to 125°C
temperature range while the LM285-1.2 is rated −40°C to 85°
C and the LM385-1.2 0°C to 70°C. The LM185-1.2/LM285-1.2
are available in a hermetic TO-46 package and the
LM285-1.2/LM385-1.2 are also available in a low-cost TO-92
molded package, as well as SO and SOT-23. The LM185-1.2
is also available in a hermetic leadless chip carrier package.
Features
■ ±1% and 2% initial tolerance
■ Operating current of 10μA to 20mA
■ 1Ω dynamic impedance
■ Low temperature coefficient
■ Low voltage reference—1.235V
■ 2.5V device and adjustable device also available
■ LM185-2.5 series and LM185 series, respectively
Click here to download National Semiconductor pdf datasheets LM185-1.2/LM285-1.2/LM385-1.2 Micropower Voltage Reference Diode
Datasheets Download-National Semiconductor pdf datasheets
Monday, May 13, 2013
LF198/LF298/LF398, LF198A/LF398A Monolithic Sample-and-Hold Circuits
LF198/LF298/LF398, LF198A/LF398A
Monolithic Sample-and-Hold Circuits
General Description
The LF198/LF298/LF398 are monolithic sample-and-hold
circuits which utilize BI-FET technology to obtain ultra-high
dc accuracy with fast acquisition of signal and low droop
rate. Operating as a unity gain follower, dc gain accuracy is
0.002% typical and acquisition time is as low as 6 μs to
0.01%. A bipolar input stage is used to achieve low offset
voltage and wide bandwidth. Input offset adjust is accomplished
with a single pin, and does not degrade input offset
drift. The wide bandwidth allows the LF198 to be included inside
the feedback loop of 1 MHz op amps without having stability
problems. Input impedance of 1010W allows high
source impedances to be used without degrading accuracy.
P-channel junction FET’s are combined with bipolar devices
in the output amplifier to give droop rates as low as 5 mV/min
with a 1 μF hold capacitor. The JFET’s have much lower
noise than MOS devices used in previous designs and do
not exhibit high temperature instabilities. The overall design
guarantees no feed-through from input to output in the hold
mode, even for input signals equal to the supply voltages.
Features
n Operates from ±5V to ±18V supplies
n Less than 10 μs acquisition time
n TTL, PMOS, CMOS compatible logic input
n 0.5 mV typical hold step at Ch = 0.01 μF
n Low input offset
n 0.002% gain accuracy
n Low output noise in hold mode
n Input characteristics do not change during hold mode
n High supply rejection ratio in sample or hold
n Wide bandwidth
n Space qualified, JM38510
Logic inputs on the LF198 are fully differential with low input
current, allowing direct connection to TTL, PMOS, and
CMOS. Differential threshold is 1.4V. The LF198 will operate
from ±5V to ±18V supplies.
An “A” version is available with tightened electrical
specifications.
Click here to download National Semiconductor pdf datasheets LF198/LF298/LF398, LF198A/LF398A Monolithic Sample-and-Hold Circuits
Datasheets Download-National Semiconductor pdf datasheets download
Monolithic Sample-and-Hold Circuits
General Description
The LF198/LF298/LF398 are monolithic sample-and-hold
circuits which utilize BI-FET technology to obtain ultra-high
dc accuracy with fast acquisition of signal and low droop
rate. Operating as a unity gain follower, dc gain accuracy is
0.002% typical and acquisition time is as low as 6 μs to
0.01%. A bipolar input stage is used to achieve low offset
voltage and wide bandwidth. Input offset adjust is accomplished
with a single pin, and does not degrade input offset
drift. The wide bandwidth allows the LF198 to be included inside
the feedback loop of 1 MHz op amps without having stability
problems. Input impedance of 1010W allows high
source impedances to be used without degrading accuracy.
P-channel junction FET’s are combined with bipolar devices
in the output amplifier to give droop rates as low as 5 mV/min
with a 1 μF hold capacitor. The JFET’s have much lower
noise than MOS devices used in previous designs and do
not exhibit high temperature instabilities. The overall design
guarantees no feed-through from input to output in the hold
mode, even for input signals equal to the supply voltages.
Features
n Operates from ±5V to ±18V supplies
n Less than 10 μs acquisition time
n TTL, PMOS, CMOS compatible logic input
n 0.5 mV typical hold step at Ch = 0.01 μF
n Low input offset
n 0.002% gain accuracy
n Low output noise in hold mode
n Input characteristics do not change during hold mode
n High supply rejection ratio in sample or hold
n Wide bandwidth
n Space qualified, JM38510
Logic inputs on the LF198 are fully differential with low input
current, allowing direct connection to TTL, PMOS, and
CMOS. Differential threshold is 1.4V. The LF198 will operate
from ±5V to ±18V supplies.
An “A” version is available with tightened electrical
specifications.
Click here to download National Semiconductor pdf datasheets LF198/LF298/LF398, LF198A/LF398A Monolithic Sample-and-Hold Circuits
Datasheets Download-National Semiconductor pdf datasheets download
LM3404/04HV 1.0A Constant Current Buck Regulator for Driving High Power LEDs
LM3404/04HV
1.0A Constant Current Buck Regulator for Driving High
Power LEDs
General Description
The LM3404/04HV are monolithic switching regulators designed
to deliver constant currents to high power LEDs. Ideal
for automotive, industrial, and general lighting applications,
they contain a high-side N-channel MOSFET switch with a
current limit of 1.5A (typical) for step-down (Buck) regulators.
Hysteretic controlled on-time and an external resistor allow
the converter output voltage to adjust as needed to deliver a
constant current to series and series-parallel connected LED
arrays of varying number and type. LED dimming via pulse
width modulation (PWM), broken/open LED protection, lowpower
shutdown and thermal shutdown complete the feature
set.
Features
■ Integrated 1.0A MOSFET
■ VIN Range 6V to 42V (LM3404)
■ VIN Range 6V to 75V (LM3404HV)
■ 1.2A Output Current Over Temperature
■ Cycle-by-Cycle Current Limit
■ No Control Loop Compensation Required
■ Separate PWM Dimming and Low Power Shutdown
■ Supports all-ceramic output capacitors and capacitor-less
outputs
■ Thermal shutdown protection
■ SO-8 Package, PSOP-8 Package
Applications
■ LED Driver
■ Constant Current Source
■ Automotive Lighting
■ General Illumination
■ Industrial Lighting
Click here to download National Semiconductor pdf datasheets LM3404/04HV 1.0A Constant Current Buck Regulator for Driving High Power LEDs
Datasheets Download-National Semiconductor pdf datasheets download
1.0A Constant Current Buck Regulator for Driving High
Power LEDs
General Description
The LM3404/04HV are monolithic switching regulators designed
to deliver constant currents to high power LEDs. Ideal
for automotive, industrial, and general lighting applications,
they contain a high-side N-channel MOSFET switch with a
current limit of 1.5A (typical) for step-down (Buck) regulators.
Hysteretic controlled on-time and an external resistor allow
the converter output voltage to adjust as needed to deliver a
constant current to series and series-parallel connected LED
arrays of varying number and type. LED dimming via pulse
width modulation (PWM), broken/open LED protection, lowpower
shutdown and thermal shutdown complete the feature
set.
Features
■ Integrated 1.0A MOSFET
■ VIN Range 6V to 42V (LM3404)
■ VIN Range 6V to 75V (LM3404HV)
■ 1.2A Output Current Over Temperature
■ Cycle-by-Cycle Current Limit
■ No Control Loop Compensation Required
■ Separate PWM Dimming and Low Power Shutdown
■ Supports all-ceramic output capacitors and capacitor-less
outputs
■ Thermal shutdown protection
■ SO-8 Package, PSOP-8 Package
Applications
■ LED Driver
■ Constant Current Source
■ Automotive Lighting
■ General Illumination
■ Industrial Lighting
Click here to download National Semiconductor pdf datasheets LM3404/04HV 1.0A Constant Current Buck Regulator for Driving High Power LEDs
Datasheets Download-National Semiconductor pdf datasheets download
LM6165/LM6265/LM6365 High Speed Operational Amplifier download National Semiconductor pdf datasheets
LM6165/LM6265/LM6365
High Speed Operational Amplifier
General Description
The LM6165 family of high-speed amplifiers exhibits an excellent
speed-power product in delivering 300 V/μs and
725 MHz GBW (stable for gains as low as +25) with only
5 mA of supply current. Further power savings and application
convenience are possible by taking advantage of the
wide dynamic range in operating supply voltage which extends
all the way down to +5V.
These amplifiers are built with National’s VIP™ (Vertically Integrated
PNP) process which produces fast PNP transistors
that are true complements to the already fast NPN devices.
This advanced junction-isolated process delivers high speed
performance without the need for complex and expensive dielectric
isolation.
Features
n High slew rate: 300 V/μs
n High GBW product: 725 MHz
n Low supply current: 5 mA
n Fast settling: 80 ns to 0.1%
n Low differential gain: <0.1%
n Low differential phase: <0.1°
n Wide supply range: 4.75V to 32V
n Stable with unlimited capacitive load
Applications
n Video amplifier
n Wide-bandwidth signal conditioning
n Radar
n Sonar
Click here to download National Semiconductor pdf datasheets LM6165/LM6265/LM6365 High Speed Operational Amplifier
Datasheets Download-National Semiconductor pdf datasheets download
High Speed Operational Amplifier
General Description
The LM6165 family of high-speed amplifiers exhibits an excellent
speed-power product in delivering 300 V/μs and
725 MHz GBW (stable for gains as low as +25) with only
5 mA of supply current. Further power savings and application
convenience are possible by taking advantage of the
wide dynamic range in operating supply voltage which extends
all the way down to +5V.
These amplifiers are built with National’s VIP™ (Vertically Integrated
PNP) process which produces fast PNP transistors
that are true complements to the already fast NPN devices.
This advanced junction-isolated process delivers high speed
performance without the need for complex and expensive dielectric
isolation.
Features
n High slew rate: 300 V/μs
n High GBW product: 725 MHz
n Low supply current: 5 mA
n Fast settling: 80 ns to 0.1%
n Low differential gain: <0.1%
n Low differential phase: <0.1°
n Wide supply range: 4.75V to 32V
n Stable with unlimited capacitive load
Applications
n Video amplifier
n Wide-bandwidth signal conditioning
n Radar
n Sonar
Click here to download National Semiconductor pdf datasheets LM6165/LM6265/LM6365 High Speed Operational Amplifier
Datasheets Download-National Semiconductor pdf datasheets download
Sunday, May 12, 2013
LMV331 Single / LMV393 Dual / LMV339 Quad General Purpose, Low Voltage, Tiny Pack Comparators
LMV331 Single / LMV393 Dual / LMV339 Quad
General Purpose, Low Voltage, Tiny Pack Comparators
General Description
The LMV393 and LMV339 are low voltage (2.7-5V) versions
of the dual and quad comparators, LM393/339, which are
specified at 5-30V. The LMV331 is the single version, which
is available in space saving 5-pin SC70 and 5-pin SOT23
packages. The 5-pin SC70 is approximately half the size of
the 5-pin SOT23.
The LMV393 is available in 8-pin SOIC and MSOP. The
LMV339 is available in 14-pin SOIC and TSSOP.
The LMV331/393/339 is the most cost-effective solution
where space, low voltage, low power and price are the primary
specification in circuit design for portable consumer
products. They offer specifications that meet or exceed the
familiar LM393/339 at a fraction of the supply current.
The chips are built with National's advanced Submicron Silicon-
Gate BiCMOS process. The LMV331/393/339 have bipolar
input and output stages for improved noise performance.
Features
(For 5V supply, typical unless otherwise noted)
■ Guaranteed 2.7V and 5V performance
■ Industrial temperature range −40°C to +85°C
■ Low supply current 60 μA/Channel
■ Input common mode voltage range includes ground
■ Low output saturation voltage 200 mV
■ Propagation delay 200 ns
■ Space saving 5-pin SC70 and 5-Pin SOT23 packages
Applications
■ Mobile communications
■ Notebooks and PDA's
■ Battery powered electronics
■ General purpose portable device
■ General purpose low voltage applications
Click here to download National Semiconductor pdf datasheets
Datasheets Download-National Semiconductor pdf datasheets download
General Purpose, Low Voltage, Tiny Pack Comparators
General Description
The LMV393 and LMV339 are low voltage (2.7-5V) versions
of the dual and quad comparators, LM393/339, which are
specified at 5-30V. The LMV331 is the single version, which
is available in space saving 5-pin SC70 and 5-pin SOT23
packages. The 5-pin SC70 is approximately half the size of
the 5-pin SOT23.
The LMV393 is available in 8-pin SOIC and MSOP. The
LMV339 is available in 14-pin SOIC and TSSOP.
The LMV331/393/339 is the most cost-effective solution
where space, low voltage, low power and price are the primary
specification in circuit design for portable consumer
products. They offer specifications that meet or exceed the
familiar LM393/339 at a fraction of the supply current.
The chips are built with National's advanced Submicron Silicon-
Gate BiCMOS process. The LMV331/393/339 have bipolar
input and output stages for improved noise performance.
Features
(For 5V supply, typical unless otherwise noted)
■ Guaranteed 2.7V and 5V performance
■ Industrial temperature range −40°C to +85°C
■ Low supply current 60 μA/Channel
■ Input common mode voltage range includes ground
■ Low output saturation voltage 200 mV
■ Propagation delay 200 ns
■ Space saving 5-pin SC70 and 5-Pin SOT23 packages
Applications
■ Mobile communications
■ Notebooks and PDA's
■ Battery powered electronics
■ General purpose portable device
■ General purpose low voltage applications
Click here to download National Semiconductor pdf datasheets
Datasheets Download-National Semiconductor pdf datasheets download
download National Semiconductor pdf datasheets LM3421, LM3423 N-Channel Controllers for Constant Current LED Drivers
LM3421, LM3423
N-Channel Controllers for Constant Current LED Drivers
General Description
The LM3421/LM3423 devices are versatile high voltage LED
driver controllers. With the capability to be configured in a
Buck, Boost, Buck-Boost (Flyback), or SEPIC topology, and
an input operating voltage rating of 75V, these controllers are
ideal for illuminating LEDs in a very diverse, large family of
applications.
Adjustable high-side current sense with a typical sense voltage
of 100mV allows for tight regulation of the LED current
with the highest efficiency possible. Output LED current regulation
is based on peak current-mode control with predictive
Off-Time Control. This method of control eases the design of
loop compensation while providing inherent input voltage
feed-forward compensation.
The LM3421/LM3423 include a high-voltage startup regulator
that operates over a wide input range of 4.5V to 75V. The
internal PWM controller is designed for adjustable switching
frequencies of up to 2.0MHz, thus enabling compact solutions.
Additional features include: “zero” current shutdown,
precision reference, logic compatible DIM input suitable for
fast PWM dimming, cycle-by-cycle current limit, and thermal
shutdown.
The LM3423 also includes an LED output status flag, a fault
flag, a programmable fault timer, and a logic input to select
the polarity of the dimming output driver.
Click here to download National Semiconductor pdf datasheets LM3421, LM3423 N-Channel Controllers for Constant Current LED Drivers
Datasheets Download-National Semiconductor pdf datasheets download
N-Channel Controllers for Constant Current LED Drivers
General Description
The LM3421/LM3423 devices are versatile high voltage LED
driver controllers. With the capability to be configured in a
Buck, Boost, Buck-Boost (Flyback), or SEPIC topology, and
an input operating voltage rating of 75V, these controllers are
ideal for illuminating LEDs in a very diverse, large family of
applications.
Adjustable high-side current sense with a typical sense voltage
of 100mV allows for tight regulation of the LED current
with the highest efficiency possible. Output LED current regulation
is based on peak current-mode control with predictive
Off-Time Control. This method of control eases the design of
loop compensation while providing inherent input voltage
feed-forward compensation.
The LM3421/LM3423 include a high-voltage startup regulator
that operates over a wide input range of 4.5V to 75V. The
internal PWM controller is designed for adjustable switching
frequencies of up to 2.0MHz, thus enabling compact solutions.
Additional features include: “zero” current shutdown,
precision reference, logic compatible DIM input suitable for
fast PWM dimming, cycle-by-cycle current limit, and thermal
shutdown.
The LM3423 also includes an LED output status flag, a fault
flag, a programmable fault timer, and a logic input to select
the polarity of the dimming output driver.
Click here to download National Semiconductor pdf datasheets LM3421, LM3423 N-Channel Controllers for Constant Current LED Drivers
Datasheets Download-National Semiconductor pdf datasheets download
LM139/LM239/LM339/LM2901/LM3302 download LM313 National Semiconductor pdf datasheets
LM139/LM239/LM339/LM2901/LM3302
Low Power Low Offset Voltage Quad Comparators
General Description
The LM139 series consists of four independent precision
voltage comparators with an offset voltage specification as
low as 2 mV max for all four comparators. These were
designed specifically to operate from a single power supply
over a wide range of voltages. Operation from split power
supplies is also possible and the low power supply current
drain is independent of the magnitude of the power supply
voltage. These comparators also have a unique characteristic
in that the input common-mode voltage range includes
ground, even though operated from a single power supply
voltage.
Application areas include limit comparators, simple analog to
digital converters; pulse, squarewave and time delay generators;
wide range VCO; MOS clock timers; multivibrators
and high voltage digital logic gates. The LM139 series was
designed to directly interface with TTL and CMOS. When
operated from both plus and minus power supplies, they will
directly interface with MOS logic— where the low power
drain of the LM339 is a distinct advantage over standard
comparators.
Features
n Wide supply voltage range
n LM139/139A Series 2 to 36 VDC or ±1 to ±18 VDC
n LM2901: 2 to 36 VDC or ±1 to ±18 VDC
n LM3302: 2 to 28 VDC or ±1 to ±14 VDC
n Very low supply current drain (0.8 mA) — independent
of supply voltage
n Low input biasing current: 25 nA
n Low input offset current: ±5 nA
n Offset voltage: ±3 mV
n Input common-mode voltage range includes GND
n Differential input voltage range equal to the power
supply voltage
n Low output saturation voltage: 250 mV at 4 mA
n Output voltage compatible with TTL, DTL, ECL, MOS
and CMOS logic systems
Advantages
n High precision comparators
n Reduced VOS drift over temperature
n Eliminates need for dual supplies
n Allows sensing near GND
n Compatible with all forms of logic
n Power drain suitable for battery operation
Click here to download LM313 National Semiconductor pdf datasheets LM139/LM239/LM339/LM2901/LM3302
Datasheets Download-National Semiconductor pdf datasheets download
Low Power Low Offset Voltage Quad Comparators
General Description
The LM139 series consists of four independent precision
voltage comparators with an offset voltage specification as
low as 2 mV max for all four comparators. These were
designed specifically to operate from a single power supply
over a wide range of voltages. Operation from split power
supplies is also possible and the low power supply current
drain is independent of the magnitude of the power supply
voltage. These comparators also have a unique characteristic
in that the input common-mode voltage range includes
ground, even though operated from a single power supply
voltage.
Application areas include limit comparators, simple analog to
digital converters; pulse, squarewave and time delay generators;
wide range VCO; MOS clock timers; multivibrators
and high voltage digital logic gates. The LM139 series was
designed to directly interface with TTL and CMOS. When
operated from both plus and minus power supplies, they will
directly interface with MOS logic— where the low power
drain of the LM339 is a distinct advantage over standard
comparators.
Features
n Wide supply voltage range
n LM139/139A Series 2 to 36 VDC or ±1 to ±18 VDC
n LM2901: 2 to 36 VDC or ±1 to ±18 VDC
n LM3302: 2 to 28 VDC or ±1 to ±14 VDC
n Very low supply current drain (0.8 mA) — independent
of supply voltage
n Low input biasing current: 25 nA
n Low input offset current: ±5 nA
n Offset voltage: ±3 mV
n Input common-mode voltage range includes GND
n Differential input voltage range equal to the power
supply voltage
n Low output saturation voltage: 250 mV at 4 mA
n Output voltage compatible with TTL, DTL, ECL, MOS
and CMOS logic systems
Advantages
n High precision comparators
n Reduced VOS drift over temperature
n Eliminates need for dual supplies
n Allows sensing near GND
n Compatible with all forms of logic
n Power drain suitable for battery operation
Click here to download LM313 National Semiconductor pdf datasheets LM139/LM239/LM339/LM2901/LM3302
Datasheets Download-National Semiconductor pdf datasheets download
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