Integrated Circuits (ICs)

UC1844L

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Texas Instruments

SWITCHING CONTROLLER

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Integrated Circuits (ICs)

UC1844L

Active

Texas Instruments

SWITCHING CONTROLLER

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Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	UC1844L

Clock Sync	False
Control Features	Frequency Control
Duty Cycle (Max) [Max]	48 %
Frequency - Switching [Max]	500 kHz
Function	Step-Up/Step-Down, Step-Up
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-55 °C
Output Configuration	Isolation Capable, Positive
Output Phases	1
Output Type	Transistor Driver
Package / Case	20-LCC (J-Lead)
Supplier Device Package	20-PLCC
Supplier Device Package [x]	9
Supplier Device Package [y]	9
Synchronous Rectifier	False
Topology	Forward, Flyback, Boost
Voltage - Supply (Vcc/Vdd) [Max]	30 V
Voltage - Supply (Vcc/Vdd) [Min]	10 V

UC1844 Series

Current Mode PWM Controller

Part	Supplier Device Package [x]	Supplier Device Package [y]	Supplier Device Package	Control Features	Operating Temperature [Max]	Operating Temperature [Min]	Frequency - Switching [Max]	Topology	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Package / Case	Output Phases	Output Type	Mounting Type	Output Configuration	Function	Duty Cycle (Max) [Max]	Number of Outputs	Current - Supply	Package / Case	Package / Case	Voltage - Supply [Min]	Voltage - Supply [Max]	Applications	Voltage - Input [Max]	Voltage - Input [Min]
Texas Instruments UC1844L	9	9	20-PLCC	Frequency Control	125 °C	-55 °C	500 kHz	Boost Flyback Forward	10 V	30 V	20-LCC (J-Lead)	1	Transistor Driver	Surface Mount	Isolation Capable Positive	Step-Up Step-Up/Step-Down	48 %	1
Texas Instruments 5962-8670403XA
Texas Instruments UC1844AMDREP			8-SOIC		125 °C	-55 °C					8-SOIC			Surface Mount					11 mA	0.154 in	3.9 mm	10 VDC	30 VDC	PWM Controller	6.3 V	-3 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Bulk	54	$ 5.60
		57	$ 5.29
	N/A	84	$ 6.39

Description

General part information

UC1844 Series

The UC1842A/3A/4A/5A family of control ICs is a pin-for-pin compatible improved version of the UC3842/3/4/5 family. Providing the necessary features to control current mode switched mode power supplies, this family has the following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

Documents

Technical documentation and resources

No documents available