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UC1844AL

Description
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CQCC20, LCC-20
CategoryPower/power management    The power supply circuit   
File Size564KB,10 Pages
ManufacturerUnitrode Corporation
Download Datasheet Parametric Compare View All

UC1844AL Overview

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

UC1844AL Parametric

Parameter NameAttribute value
Is it Rohs certified?incompatible
MakerUnitrode Corporation
package instructionQCCN, LCC20,.35SQ
Reach Compliance Codeunknown
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
Number of functions1
Number of terminals20
Maximum operating temperature125 °C
Minimum operating temperature-55 °C
Maximum output current1 A
Nominal output voltage2.5 V
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
Maximum supply current (Isup)17 mA
surface mountYES
Switch configurationSINGLE
Maximum switching frequency500 kHz
technologyBIPOLAR
Temperature levelMILITARY
Terminal surfaceTin/Lead (Sn/Pb)
Terminal formNO LEAD
Terminal pitch1.27 mm
Terminal locationQUAD
Maximum time at peak reflow temperatureNOT SPECIFIED
UC1842A/3A/4A/5A
UC2842A/3A/4A/5A
UC3842A/3A/4A/5A
Current Mode PWM Controller
FEATURES
Optimized for Off-line and DC to DC
Converters
Low Start Up Current (<0.5mA)
Trimmed Oscillator Discharge Current
Automatic Feed Forward Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load Response Characteristics
Under-Voltage Lockout With Hysteresis
Double Pulse Suppression
Part #
UVLO On
16.0V
8.5V
16.0V
8.5V
UVLO Off
10.0V
7.9V
10.0V
7.9V
Maximum Duty
Cycle
<100%
<100%
<50%
<50%
DESCRIPTION
The UC1842A/3A/4A/5A family of control ICs is a pin for pin compat-
ible improved version of the UC3842/3/4/5 family. Providing the nec-
essary features to control current mode switched mode power
supplies, this family has the following improved features. Start up cur-
rent is guaranteed to be less than 0.5mA. Oscillator discharge is
trimmed to 8.3mA. During under voltage lockout, the output stage can
sink at least 10mA at less than 1.2V for V
CC
over 5V.
The difference between members of this family are shown in the table
below.
High Current Totem Pole Output
Internally Trimmed Bandgap Reference
500kHz Operation
Low R
O
Error Amp
UC1842A
UC1843A
UC1844A
UC1845A
BLOCK DIAGRAM
Note 1: A/B A = DIL-8 Pin Number. B = SO-14 Pin Number.
Note 2: Toggle flip flop used only in 1844A and 1845A.
9/94

UC1844AL Related Products

UC1844AL UC1842AL UC1843AL UC1845AL
Description Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CQCC20, LCC-20 Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CQCC20, LCC-20 Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CQCC20, LCC-20 Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, CQCC20, LCC-20
Is it Rohs certified? incompatible incompatible incompatible incompatible
package instruction QCCN, LCC20,.35SQ QCCN, LCC20,.35SQ QCCN, LCC20,.35SQ QCCN, LCC20,.35SQ
Reach Compliance Code unknown unknown unknown unknown
Analog Integrated Circuits - Other Types SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER
control mode CURRENT-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
Control Technology PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
Maximum input voltage 25 V 25 V 25 V 25 V
Minimum input voltage 12 V 12 V 12 V 12 V
Nominal input voltage 15 V 15 V 15 V 15 V
JESD-30 code S-CQCC-N20 S-CQCC-N20 S-CQCC-N20 S-CQCC-N20
JESD-609 code e0 e0 e0 e0
Number of functions 1 1 1 1
Number of terminals 20 20 20 20
Maximum operating temperature 125 °C 125 °C 125 °C 125 °C
Minimum operating temperature -55 °C -55 °C -55 °C -55 °C
Maximum output current 1 A 1 A 1 A 1 A
Nominal output voltage 2.5 V 2.5 V 2.5 V 2.5 V
Package body material CERAMIC, METAL-SEALED COFIRED CERAMIC, METAL-SEALED COFIRED CERAMIC, METAL-SEALED COFIRED CERAMIC, METAL-SEALED COFIRED
encapsulated code QCCN QCCN QCCN QCCN
Encapsulate equivalent code LCC20,.35SQ LCC20,.35SQ LCC20,.35SQ LCC20,.35SQ
Package shape SQUARE SQUARE SQUARE SQUARE
Package form CHIP CARRIER CHIP CARRIER CHIP CARRIER CHIP CARRIER
Peak Reflow Temperature (Celsius) NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
Certification status Not Qualified Not Qualified Not Qualified Not Qualified
Maximum supply current (Isup) 17 mA 17 mA 17 mA 17 mA
surface mount YES YES YES YES
Switch configuration SINGLE SINGLE SINGLE SINGLE
Maximum switching frequency 500 kHz 500 kHz 500 kHz 500 kHz
technology BIPOLAR BIPOLAR BIPOLAR BIPOLAR
Temperature level MILITARY MILITARY MILITARY MILITARY
Terminal surface Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
Terminal form NO LEAD NO LEAD NO LEAD NO LEAD
Terminal pitch 1.27 mm 1.27 mm 1.27 mm 1.27 mm
Terminal location QUAD QUAD QUAD QUAD
Maximum time at peak reflow temperature NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
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