LX8942 Datasheet, PDF (1/8 Pages) Microsemi Corporation – Low Dropout Dual Regulator

LX8942
TM
®
Low Dropout Dual Regulator
PRODUCTION DATA SHEET
DESCRIPTION
The Microsemi LX8942 is a dual The high current regulator has over
8.2V/5V positive voltage regulator. One voltage shutdown to protect both the internal
output is a high current (up to 1000mA) circuitry and the load during line transients,
regulator that can be turned on or off by a such as load dump (60V). In addition, the
high impedance low current TTL high current regulator design also has built-
compatible switch. The second or standby in protection for short circuit and thermal
output remains on regardless. The on/off overload. During these fault conditions of
switch not only shuts off the high current the primary output, the standby regulator
output but actually puts the IC in a will continue to power its load.
micropower mode, achieving low The LX8942 is the 8.2 volt, ±5% version
quiescent current. This unique of a family of dual regulators with a standby
characteristic coupled with an extremely output voltage of 5V. Other high-current
low dropout, (0.55V for output current of outputs programmed for 5V and 12V
10mA) makes the LX8942 well suited for regulation are available in the SG29055,
power systems that require standby SG29125 devices. They are designed to
memory. The LX8942 includes other function over the full automotive ambient
features which were originally designed temperature range of -40°C to 85°C.
for automotive applications. These include
protection from reverse battery
installations, double battery jumps and
load dump (transients).
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
ƒ 2% Internally Trimmed Output
ƒ Two regulated outputs
ƒ Output current in excess of
1000mA
ƒ Low quiescent current standby
regulator
ƒ Drop-out Voltage, Input-output
differential <0.6V at 0.5A
ƒ Reverse battery protection
ƒ 60V load dump protection
ƒ -50V reverse transient protection
ƒ Short circuit protection
ƒ Internal thermal overload
protection
ƒ ON/OFF switch for high current
output
ƒ Surface Mount TO-252
APPLICATIONS
ƒ Automotive electronics for
controls, entertainment and
safety functions
ƒ Continuous operation systems
C1*
0.1µF
ON/OFF Switch (for
output voltage only)
PRODUCT HIGHLIGHT
Input Voltage
(VIN)
* Required close to regulator package.
** Required for stability. May be increased without bound.
Capacitor must be rated to operate at the minimum
temperature expected for the regulator system.
1
Over Voltage
Thermal
Shutdown
+
-
Regulator
Bias
4
1.23V
Reference
5V Standby
Regulator
LX8942
3
2
C2 **
47µF
Output Voltage (VOUT1)
(8.2V, 1000mA)
5
C3**
100µF
Standby Output (VSB)
(5V, 60mA)
Copyright © 2005
Rev. 1.2, 2006-01-20
Ground
T_J (°C)
-40 to 85
PACKAGE ORDER INFO
Plastic TO-252
DT _5-Pin
RoHS Compliant / Pb-free
LX8942IDT
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8942IDT-TR)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
Page 1