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PDF LM2591HVS-ADJ Data sheet ( Hoja de datos )
| Número de pieza | LM2591HVS-ADJ | |
| Descripción | SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2003
LM2591HV
SIMPLE SWITCHER®Power Converter 150 kHz 1A
Step-Down Voltage Regulator
General Description
The LM2591HV 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
LM2590HV, but without some of the supervisory and perfor-
mance features of the latter.
Requiring a minimum number of external components, these
regulators are simple to use and include internal frequency
compensation†, improved line and load specifications and a
fixed-frequency oscillator.
The LM2591HV 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 5-lead TO-220 package with several
different lead bend options, and a 5-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 5-pin TO-220 and TO-263 (surface mount)
Package
n Input voltage range up to 60V
n 150 kHz fixed frequency internal oscillator
n On/Off control
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)
10129301
SIMPLE SWITCHER® and Switchers Made Simple® are registered trademarks of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS101293
www.national.com
1 page  
Typical Performance Characteristics (Circuit of Figure 1) (Continued)
Switch Current Limit
Dropout Voltage
Operating
Quiescent Current
10129306
Shutdown
Quiescent Current
10129307
Minimum Operating
Supply Voltage
10129308
Feedback Pin
Bias Current
10129309
10129310
5
10129311
www.national.com
5 Page 
Inductor Value Selection Guides (For Continuous Mode Operation) (Continued)
FIGURE 4. LM2591HV-ADJ
10129367
FIGURE 5. Current Ripple Ratio
10129368
11 www.national.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LM2591HVS-ADJ.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM2591HVS-ADJ | SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator | National Semiconductor |
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