TL3844D Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The TL3844D is a current-mode PWM controller IC from Texas Instruments supporting 12V to 30V input, 500kHz maximum switching frequency, and 200mA gate drive output in a 14-pin SOIC package. It provides fixed-frequency peak current control for step-up and flyback converter topologies. RoHS compliant and available in volume quantities for industrial and consumer SMPS designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- TL3844D Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM control with 500kHz maximum switching frequency for compact magnetics
- 200mA totem-pole gate drive output for direct MOSFET gate driving without external driver
- Input voltage range of 12V to 30V for offline auxiliary and industrial DC-DC converters
- Maximum 48% duty cycle limit (TL3844) for single-ended flyback converter operation
- Precision 5V internal reference output for biasing external feedback networks
- Internal soft-start and cycle-by-cycle current limiting for robust overcurrent protection
Applications
The TL3844D is widely deployed as the control IC in offline flyback converters, industrial SMPS, and battery charger designs for powering embedded systems, telecom equipment, and industrial instrumentation. It is also used in isolated DC-DC modules, LED driver power stages, and auxiliary power supplies for motor drive systems where current-mode PWM control with hard-switching topology is required.
Specifications
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING REGULATOR |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 12V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 5.1V |
| Output Voltage-Min | 4.9V |
| Output Voltage-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 30mA |
| Supply Voltage-Max (Vsup) | 30V |
| Supply Voltage-Nom (Vsup) | 15V |
| Surface Mount | YES |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TL3844D:
Switching Regulator, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14
Switching Regulator, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
Switching Regulator, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14
Switching Regulator, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14
Frequently Asked Questions
What is the difference between TL3844D and TL3842BDR?
The TL3844D has a maximum duty cycle limit of 48%, making it suitable for single-ended forward and flyback converters where duty cycle must not exceed 50%. The TL3842BDR does not have this fixed duty cycle restriction. Both use current-mode PWM control with the same pinout in 14-pin SOIC packages.
What switching frequency does the TL3844D support?
The TL3844D supports a maximum switching frequency of 500kHz, programmed by an external resistor and capacitor connected to the RT and CT pins. Higher switching frequencies allow the use of smaller inductors and filter capacitors, reducing the overall SMPS physical size.
Can the TL3844D drive a power MOSFET directly?
Yes, the TL3844D provides a totem-pole output stage capable of sourcing and sinking 200mA of peak gate drive current, enabling direct driving of most power MOSFETs in low-to-medium power SMPS designs without requiring a separate discrete gate driver IC.
Is the TL3844D suitable for flyback converter designs?
Yes, the TL3844D's maximum 48% duty cycle clamp makes it particularly well-suited for single-switch flyback and forward converter topologies. The current-mode control scheme provides inherent flux balancing in the transformer and fast transient response for isolated switching power supply designs.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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