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PDF LM238K Data sheet ( Hoja de datos )
| Número de pieza | LM238K | |
| Descripción | THREE-TERMINAL 5A ADJUSTABLE VOLTAGE REGULATORS | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM238K (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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LM138 - LM238 - LM338
Three-terminal 5 A adjustable voltage regulators
Features
■ Guaranteed 7 A peak output current
■ Guaranteed 5 A output current
)■ Adjustable output down to 1.2 V
t(s■ Line regulation typically 0.005 %/V
uc■ Load regulation typically 0.1 %
d■ Guaranteed thermal regulation
ro■ Current limit constant with temperature
P■ Standard 3-lead transistor package
oleteDescription
bsThe LM138, LM238, LM338 are adjustable 3-
Oterminal positive voltage regulators capable of
-supplying in excess of 5 A over a 1.2 V to 32 V
)output range. They are exceptionally easy to use
t(sand require only 2 resistors to set the output
voltage. Careful circuit design has resulted in
ucoutstanding load and line regulation comparable
dto many commercial power supplies. The LM138
rofamily is supplied in a standard 3-lead transistor
Ppackage.
teA unique feature of the LM138 family is time-de-
lependent current limiting. The current limit circuitry
oallows peak currents of up to 12 A to be drawn
sfrom the regulator for short periods of time. This
ballows the LM138 to be used with heavy transient
Oloads and speeds start-up under full-load
TO-3
protection remains functional even if the
adjustment pin is accidentally disconnected.
Normally, no capacitors are needed unless the
device is situated far from the input filter
capacitors in which case an input bypass is
needed. An optional output capacitor can be
added to improve transient response. The
adjustment terminal can be bypassed to
achieve.very high ripple rejection ratios which are
difficult to achieve with standard 3-terminal
regulators.
Besides replacing fixed regulators or discrete
designs, the LM238 is useful in a wide variety of
other applications. Since the regulator is "floating"
and sees only the input-to-output differential
voltage, supplies of several hundred volts can be
regulated as long as the maximum input to input
differential is not exceeded.
The LM138, LM238, LM338 are packaged in
standard steel TO-3 transistor package. The
conditions. Under sustained loading conditions,
LM138 is rated for operation from - 55 °C to
the current limit decreases to a safe value
150 °C, the LM238 from - 25 °C to 150 °C and the
protecting the regulator. Also included on the chip LM338 from 0 °C to 125 °C.
are thermal overload protection and safe area
protection for the power transistor. Overload
Table 1. Device summary
Part numbers
LM138
LM238
LM338
Order codes
LM138K
LM238K
LM338K
Temperature range
-55 °C to 150 °C
-25 °C to 150 °C
0 °C to 125 °C
April 2008
Rev 2
1/23
www.st.com
23
1 page  
LM138 - LM238 - LM338
3 Maximum ratings
Maximum ratings
Table 2. Absolute maximum ratings
Symbol
Parameter
Value
Unit
VI - VO
PD
Input-output voltage differential
Power dissipation
35
Internally limited
V
TSTG Storage temperature range
-65 to 150
°C
TLEAD
ct(s)TOP
Lead temperature (Soldering, 10 seconds)
LM138
Operating junction temperature range LM238
LM338
300
-55 to 150
-25 to 125
0 to 125
°C
°C
ProduNote:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
leteTable 3. Thermal data
soSymbol
Parameter
ObRthJC
Obsolete Product(s) -RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient
Value
1.4
35
Unit
°C/W
°C/W
5/23
5 Page 
LM138 - LM238 - LM338
Figure 15. Line transient response
Typical characteristics
Figure 16. Load transient response
Obsolete Product(s) - Obsolete Product(s)
11/23
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet LM238K.PDF ] | |
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