Mfr Part #:

UC-3844

Mfr Name: ST

The ST UC3844 is a fixed-frequency, current-mode PWM controller designed for off-line and DC-to-DC converter applications. It operates with a wide voltage range and features a high switching frequency.

✓ Total Stock: 200,000 pcs

$ Price Range: $0.78

UC-3844 Available from 1 distributor

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Romaks Technologies ✓ Non-Authorised Inventory information	200,000 pcs On Request	200000 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

UC-3844 Specifications Quick View

Most important parameters for selection – full specs in datasheet.

SELECT ALL

Category	New Products
Manufacturer Name	ST
Duty Cycle (Max)	100%
Mounting Type	Surface Mount
Operating Temperature	0°C to 70°C
Operating Voltage	12V to 28V
Output Voltage	5.1V
Termination Style	GULL WING

View Similar Products (0)

UC-3844 Description

Short technical summary and product information.

The UC3844 from ST is a versatile current-mode Pulse Width Modulation (PWM) controller engineered for efficient off-line and DC-to-DC converter designs. It operates within a voltage range of 12V to 28V and supports a maximum switching frequency of 500 kHz, allowing for compact and responsive power supply solutions.

This integrated circuit features a high-current totem-pole output, optimized for driving power MOSFETs. Its design includes a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, and a high-gain error amplifier. The UC3844 also incorporates pulse-by-pulse current limiting and under-voltage lockout with hysteresis for robust operation.

Packaged in a 14-SOIC surface-mount case, the UC3844 is suitable for various applications requiring efficient power management. Its operating temperature range is 0°C to 70°C. The controller is designed for minimum external component count, simplifying circuit design and reducing board space.

Key specifications include an output pin current of 200 mA, a maximum duty cycle of 100%, and an operating supply current of 25 mA. The nominal input voltage is 15V. These characteristics make the UC3844 a reliable choice for demanding power conversion tasks.

UC-3844 Quick Information

Product Type: PWM Controller

Canonical Name: UC3844 Current Mode PWM Controller

Subcategory: DC-DC Switching Controllers

UC-3844 Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

UC-3844 Estimated Pricing

Qty	Low	High
1+	$0.78	$0.78

Estimated market price range - modelled values for guidance only, not live distributor offers.

UC-3844 Features

Fixed frequency current-mode PWM controller.
Wide operating voltage from 12V to 28V.
High switching frequency of 500 kHz.
Surface mount 14-SOIC package.
Optimized for off-line and DC-to-DC converters.

UC-3844 Applications

Used in off-line converter designs.
Suitable for DC-to-DC converter applications.
Enables precise duty cycle control.
Provides high-current totem-pole output.
Features pulse-by-pulse current limiting.

UC-3844 FAQs

7 frequently asked questions generated from this part’s specifications.

What is the operating voltage range of the ST UC-3844?

The ST UC-3844 operates within a voltage range of 12V to 28V.

What is the output voltage of the ST UC-3844?

The output voltage of the ST UC-3844 is 5.1V.

What is the maximum output pin current for the ST UC-3844?

The maximum output pin current for the ST UC-3844 is 200 mA.

What is the switching frequency of the ST UC-3844?

The switching frequency of the ST UC-3844 is 500 kHz.

What is the operating temperature range for the ST UC-3844?

The ST UC-3844 can operate in a temperature range from 0°C to 70°C.

What is the package type of the ST UC-3844?

The ST UC-3844 comes in a 14-SOIC (0.209, 5.30mm Width) package.

What is the mounting type for the ST UC-3844?

The ST UC-3844 uses surface mount technology.