Mfr Part #:

UC3844

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

✓ Total Stock: 35 pcs

$ Price Range: $0.75

UC3844 Available from 1 distributor

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Hybrid Electronics ✓ Non-Authorised Inventory information	35 pcs On Request	35 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

UC3844 Specifications Quick View

Most important parameters for selection – full specs in datasheet.

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Category	New Products
Manufacturer Name	STMicroelectronics
Duty Cycle	100 %
Mounting Type	Surface Mount
Operating Temperature	0°C to 70°C
Output Current	200 mA
Voltage	12V to 28V

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UC3844 Description

Short technical summary and product information.

The UC3844 is a versatile current-mode Pulse Width Modulation (PWM) controller designed by STMicroelectronics for efficient operation in offline and DC-to-DC converter applications. It requires minimal external components for implementation.

Key electrical specifications include an operating voltage range of 12V to 28V and a maximum switching frequency of 500 kHz. The controller supports a maximum duty cycle of 100% and features a high-current totem-pole output capable of driving a Power MOSFET. It also includes under-voltage lockout (UVLO) thresholds at 16V (on) and 10V (off) with hysteresis.

This PWM controller is optimized for various power supply designs, offering features such as automatic feed-forward compensation, pulse-by-pulse current limiting, and enhanced load response characteristics. The UC3844 is housed in a 14-SOIC surface-mount package and operates within a temperature range of 0°C to 70°C.

Its design incorporates an internally trimmed bandgap reference and a low-offset error amplifier, contributing to precise control and stable operation. The device is suitable for applications requiring efficient power conversion and robust performance.

UC3844 Quick Information

Product Type: PWM Controller

Series: UC3844

Canonical Name: UC3844 Current Mode PWM Controller

Subcategory: AC DC Converters, Offline Switches

UC3844 Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

UC3844 Estimated Pricing

Qty	Low	High
1+	$0.75	$0.75

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

UC3844 Features

Current-mode PWM controller.
Wide 12V to 28V operating voltage.
High 500 kHz switching frequency.
100% maximum duty cycle.
Surface mount 14-SOIC package.

UC3844 Applications

Optimized for offline converters.
Suitable for DC-to-DC converters.
Enables efficient power conversion.
Provides robust performance.

UC3844 FAQs

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

What is the operating voltage range for the UC3844?

The UC3844 operates within a voltage range of 12V to 28V.

What is the switching frequency of the UC3844 PWM controller?

The switching frequency for the UC3844 is 500 kHz.

What is the maximum duty cycle for the UC3844?

The UC3844 has a maximum duty cycle of 100%.

What are the UVLO thresholds for the UC3844?

The UC3844 has UVLO thresholds of 16V (on) and 10V (off).

What is the operating temperature range for the UC3844?

The UC3844 operates between 0°C and 70°C.

What type of package is the UC3844 available in?

The UC3844 is available in a 14-SOIC surface mount package.