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SG3845D-TR

Description
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, ROHS COMPLIANT, PLASTIC, SOIC-14
CategoryPower/power management    The power supply circuit   
File Size353KB,12 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
Environmental Compliance
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SG3845D-TR Overview

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14, ROHS COMPLIANT, PLASTIC, SOIC-14

SG3845D-TR Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerMicrosemi
Parts packaging codeSOIC
package instructionSOP, SOP14,.25
Contacts14
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage25 V
Minimum input voltage8.2 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G14
JESD-609 codee3
length8.64 mm
Humidity sensitivity level1
Number of functions1
Number of terminals14
Maximum operating temperature70 °C
Minimum operating temperature
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP14,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency500 kHz
technologyBIPOLAR
Temperature levelCOMMERCIAL
Terminal surfaceMATTE TIN
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature40
width3.875 mm
SG1844/SG1845 Series
C
URRENT
M
ODE
PWM C
ONTROLLER
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O V A T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
KEY FEATURES
OPTIMIZED FOR OFF-LINE
CONTROL
LOW START-UP CURRENT
(<1mA)
AUTOMATIC FEED FORWARD
COMPENSATION
TRIMMED OSCILLATOR
DISCHARGE CURRENT
PULSE-BY-PULSE CURRENT
LIMITING
ENHANCED LOAD RESPONSE
CHARACTERISTICS
UNDER-VOLTAGE LOCKOUT
WITH 6V HYSTERESIS
(SG1844 only)
DOUBLE PULSE
SUPPRESSION
HIGH-CURRENT TOTEM-POLE
OUTPUT
INTERNALLY TRIMMED
BANDGAP REFERENCE
500kHz OPERATION
UNDERVOLTAGE LOCKOUT
SG1844 - 16 volts SG1845 - 8.4
volts
LOW SHOOT-THROUGH
CURRENT <75mA OVER
TEMPERATURE
HIGH RELIABILITY
FEATURES
AVAILABLE TO MIL-STD-883B
LINFINITY LEVEL "S"
PROCESSING AVAILABLE
The SG1844/45 family of control ICs
provides all the necessary features to
implement off-line fixed frequency, current-
mode switching power supplies with a
minimum number of external components.
Current-mode architecture demonstrates
improved line regulation, improved load
regulation, pulse-by pulse current limiting
and inherent protection of the power supply
output switch. The bandgap reference is
trimmed to ±1% over temperature. Oscillator
discharge current is trimmed to less than
±10%. The SG1844/45 has undervoltage
lockout, current-limiting circuitry
and start-up current of less than 1mA. The
totem-pole output is optimized to drive the
gate of a power MOSFET. The output is low
in the off state to provide direct interface to
an N-channel device. Both operate up to a
maximum duty cycle range of zero to <50%
due to an internal toggle flip-flop which
blanks the output off every other clock
cycle. The SG1844/45 is specified for
operation over the full military ambient
temperature range of -55°C to 125°C. The
SG2844/45 is specified for the industrial
range of -25°C to 85°C, and the SG3844/45
is designed for the commercial range of 0°C
to 70°C.
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
R
ST
AC
INPUT
I
ST
V
CC
SG3844
PACKAGE ORDER INFO
T
A
(°C)
0 to 70
-25 to 85
-55 to
125
MIL-
STD/883
DESC
Plastic DIP
M
8-Pin
N
Plastic DIP
14-Pin
Plastic SOIC
DM
8-Pin
Plastic SOIC
D
14-Pin
Y
Ceramic Dip
8-Pin
J
Ceramic DIP
14-Pin
F
Cer Flatpack
10-Pin
L
Ceramic LCC
20-Pin
RoHS Compliant / Pb-free
Transition DC: 0503
RoHS Compliant / Pb-free
Transition DC:0440
SG3844M
SG3845M
SG2844M
SG2845M
SG3844N
SG3845N
SG28424N
SG2845N
SG3844DM
SG3845DM
SG2844DM
SG2845DM
SG3844D
SG3845D
SG2842D
SG2845D
SG3844Y
SG3845Y
SG2844Y
SG2845Y
SG1844Y
SG1845Y
SG1842Y/883B
SG1845Y/883B
SG1844Y/DESC
SG3844J
SG3845J
SG2844J
SG2845J
SG1844J
SG1845J
SG1844J/883B
SG1845J/883
SG1844J/DESC
SG1844L
SG1845L
SG1844L/883B
SG1845L/883B
SG1844F/DESC SG1844L/DESC
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LXSG3844N-TR)
Copyright
©
2000
Rev. 1.6c,2006-02-02
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
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