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SG1845L-883B-TR

Description
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CQCC20, LCC-20
CategoryPower/power management    The power supply circuit   
File Size757KB,19 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
Download Datasheet Parametric View All

SG1845L-883B-TR Overview

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CQCC20, LCC-20

SG1845L-883B-TR Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerMicrosemi
package instructionQCCN, LCC20,.35SQ
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage25 V
Minimum input voltage12 V
Nominal input voltage15 V
JESD-30 codeS-CQCC-N20
JESD-609 codee0
length8.89 mm
Number of functions1
Number of terminals20
Maximum operating temperature125 °C
Minimum operating temperature-55 °C
Maximum output current1 A
Package body materialCERAMIC, METAL-SEALED COFIRED
encapsulated codeQCCN
Encapsulate equivalent codeLCC20,.35SQ
Package shapeSQUARE
Package formCHIP CARRIER
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Filter levelMIL-STD-883 Class B
Maximum seat height2.286 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency500 kHz
technologyBIPOLAR
Temperature levelMILITARY
Terminal surfaceTIN LEAD
Terminal formNO LEAD
Terminal pitch1.27 mm
Terminal locationQUAD
Maximum time at peak reflow temperatureNOT SPECIFIED
width8.89 mm
SG1844/SG1845/SG3844/SG3845
Current Mode PWM Controller
Description
The SG1844/45 family of control ICs provides all the
required 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 under-voltage
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 SG3844/45 is designed for the commercial
range of 0°C to 70°C.
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
Undervoltage Lockout with 6V Hysteresis
(SG1844 only)
Double Pulse Suppression
High-Current Totem-Pole Output
Internally Trimmed Bandgap Reference
500kHz Operation
Under-voltage Lockout
SG1844 - 16 Volts
SG1845 - 8.4 Volts
Low Shoot-through Current <75mA Over
Temperature
Application
Available to MIL-STD-883
Available to DSCC
– Standard Microcircuit Drawing (SMD)
SGR1844/45 Rad-Tolerant Version Available
Product Highlight
R
ST
I
ST
V
cc
AC
INPUT
SG3844
Figure 1 ·
Product Highlight
November 2014 Rev. 1.7
www.microsemi.com
© 2014 Microsemi Corporation- Analog Mixed Signal Group
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