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PDF MSP1250 Data sheet ( Hoja de datos )
| Número de pieza | MSP1250 | |
| Descripción | Power Converter Step-down Voltage Regulator | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MSP1250 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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MSP1250
Power Converter 150kHz 3A
Step-down Voltage Regulator
General Description
The MSP1250 series of regulators are monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching regulator, capable of driving a 3A load
with excellent line and load regulation. These devices are avail-able in fixed output voltages
of 3.3V, 5V, 12V, and an adjust-able output version.
Requiring a minimum number of external components, these regulators are simple to use
www.DataSheet4U.com and include internal frequency compensation†, and a fixed-frequency oscillator.
The MSP1250 series 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. A standard series of inductors are
available from several different manufacturers optimized for use with the MSP1250 series.
This feature greatly simplifies the design of switch-mode power supplies.
Other features include a guaranteed ±4% tolerance on output voltage under specified input
voltage and output load conditions, and ±15% on the oscillator frequency. External
shutdown is included, featuring typically 80 µA standby current. Self-protection features
include a two stage frequency reducing current limit for the output switch and an over tem
perature shutdown for complete protection under fault conditions.
Features
3.3V, 5V, 12V, and adjustable output versions
Adjustable version output voltage range, 1.2V to 37V±4% max over line and load
conditions
Available in TO-220 and TO-263 packages
Guaranteed 3A output load current
Input voltage range up to 40V
Requires only 4 external components
Excellent line and load regulation specifications
150 kHz fixed frequency internal oscillator
TTL shutdown capability
Low power standby mode, IQ typically 80 µA
High efficiency
Uses readily available standard inductors
Thermal shutdown and current limit protection
Applications
Simple high-efficiency step-down (buck) regulator
On-card switching regulators
Positive to negative converter
1 page  
MSP1250
Power Converter 150kHz 3A
Step-down Voltage Regulator
All Output Voltage Versions Electrical Characteristics
Condition :TJ = 25
MSP1250—XX
Symbol Parameter
Conditions
Min Typ Max
(Note 4) (Note 3) (Note4
DEVICE PARAMETERS
www.DataSheet4U.com
Ib
Feedback Bias
Current
Adjustable
Version
Only, VFB = 1.3V
--
10 100
fO
Oscillator
Frequency
VSAT
VSAT Saturation
Voltage
Max Duty Cycle
DC
(ON)
Min Duty Cycle
OFF
ICL Current Limit
IL
Output Leakage
Current
IQ Quiescent Current
(Note 6)
IOUT=3A(Notes 7, 8)
(Note 8)
(Note 9)
Peak Current
(Notes 7, 8)
Output = 0V
(Notes 7, 9)
Output =-1V
(Notes 10)
(Note 9)
110
--
--
--
3.4
--
--
--
150
1.16
100
0
4.5
--
2
5
173
1.5
--
--
7.5
50
30
10
ISTBY
Standby Quiescent ON/OFF pin = 5V (OFF)
Current
(Note 10)
--
80 250
JC
JA
JA
JA
JA
VIH
VIL
IH
IL
Thermal
Resistance
TO-220 or TO-263
Junction to Case
TO-220
Package,Junction to
Ambient(Note 11)
TO-263 Package,
Junction to Ambient
(Note 12)
TO-263
Package,Junction to
Ambient(Note 13)
TO-263 Package,
Junction to
Ambient(Note 14)
CONTROL Test Circuit Figure 1
ON /OFF Pin Logic
Input
Threshold Voltage
Low (Regulator on)
High(Regulator off)
ON /OFF Pin Input
Current
VLOGIC=2.5V (Regulator
OFF)
VLOGIC=0.5V
(Regulator ON)
--
--
--
--
--
--
--
--
--
--
2 --
50 --
50 --
30 --
20 --
1.3 --
-- 0.6
-- 2.0
5 15
0.02 5
Units
nA
KHz
V
%
%
A
A
mA
mA
A
/W
/W
/W
/W
/W
V
V
V
A
A
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MSP1250.PDF ] | |
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