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Número de pieza | LM2590HVS-3.3 | |
Descripción | SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator/ with Features | |
Fabricantes | National Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de LM2590HVS-3.3 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
No Preview Available ! December 2001
LM2590HV
SIMPLE SWITCHER®Power Converter 150 kHz 1A
Step-Down Voltage Regulator, with Features
General Description
The LM2590HV series of regulators are monolithic inte-
grated circuits that provide all the active functions for a
step-down (buck) switching regulator, capable of driving a
1A load with excellent line and load regulation. These de-
vices are available in fixed output voltages of 3.3V, 5V, and
an adjustable output version.
This series of switching regulators is similar to the
LM2591HV with additional supervisory and performance fea-
tures.
Requiring a minimum number of external components, these
regulators are simple to use and include internal frequency
compensation†, improved line and load specifications,
fixed-frequency oscillator, Shutdown/Soft-start, output error
flag and flag delay.
The LM2590HV operates at a switching frequency of 150
kHz thus allowing smaller sized filter components than what
would be needed with lower frequency switching regulators.
Available in a standard 7-lead TO-220 package with several
different lead bend options, and a 7-lead TO-263 Surface
mount package.
Other features include a guaranteed ±4% tolerance on out-
put voltage under all conditions of input voltage and output
load conditions, and ±15% on the oscillator frequency. Ex-
ternal shutdown is included, featuring typically 90 µA
standby current. Self protection features include a two stage
current limit for the output switch and an over temperature
shutdown for complete protection under fault conditions.
Features
n 3.3V, 5V, and adjustable output versions
n Adjustable version output voltage range, 1.2V to 57V
±4% max over line and load conditions
n Guaranteed 1A output load current
n Available in 7-pin TO-220 and TO-263 (surface mount)
Package
n Input voltage range up to 60V
n 150 kHz fixed frequency internal oscillator
n Shutdown/Soft-start
n Out of regulation error flag
n Error flag delay
n Low power standby mode, IQ typically 90 µA
n High Efficiency
n Thermal shutdown and current limit protection
Applications
n Simple high-efficiency step-down (buck) regulator
n Efficient pre-regulator for linear regulators
n On-card switching regulators
n Positive to Negative converter
Note: † Patent Number 5,382,918.
Typical Application (Fixed Output Voltage Versions)
SIMPLE SWITCHER® and Switchers Made Simple® are registered trademarks of National Semiconductor Corporation.
© 2001 National Semiconductor Corporation DS101347
10134701
www.national.com
1 page Typical Performance Characteristics (Circuit of Figure 1)
NormalizedOutput Voltage
Line Regulation
Efficiency
10134702
Switch SaturationVoltage
Switch Current Limit
10134703
Dropout Voltage
10134704
Operating
Quiescent Current
10134705
10134706
Shutdown Quiescent Current
Minimum Operating
Supply Voltage
10134707
10134708
10134709
10134710
5 www.national.com
5 Page FIGURE 3. Timing Diagram for 5V Output
INDUCTOR VALUE SELECTION GUIDES
(For Continuous Mode Operation)
10134732
FIGURE 4. LM2590HV-3.3
10134726
11 www.national.com
11 Page |
Páginas | Total 20 Páginas | |
PDF Descargar | [ Datasheet LM2590HVS-3.3.PDF ] |
Número de pieza | Descripción | Fabricantes |
LM2590HVS-3.3 | SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator/ with Features | National Semiconductor |
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