• UC1844J CDIP


Current Mode PWM Controller 200mA 500kHz 8-Pin CDIP Tube


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  • Part Number : UC1844J

  • Package/Case : CDIP

  • Brands : TI

  • Components Categories : Switching Regulator or Controllers

  • Datesheet : UC1844J DataSheet (PDF)

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Overview of UC1844J

The UCx84x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. The internally implemented circuits include an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator that also provides current-limit control, and a totem-pole output stage that is designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The UCx84x family offers a variety of package options, temperature range options, choice of maximum duty cycle, and choice of turnon and turnoff thresholds and hysteresis ranges. Devices with higher turnon or turnoff hysteresis are ideal choices for off-line power supplies, while the devices with a narrower hysteresis range are suited for DC-DC applications. The UC184x devices are specified for operation from –55°C to 125°C, the UC284x series is specified for operation from –40°C to 85°C, and the UC384x series is specified for operation from 0°C to 70°C.

Key Features

  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1 mA)
  • Automatic feedforward compensation
  • Pulse-by-pulse current limiting
  • Enhanced load-response characteristics
  • Undervoltage lockout with hysteresis
  • Double-pulse suppression
  • High-current totem-pole output
  • Internally trimmed bandgap reference
  • Up to 500-kHz operation
  • Error amplifier with low output resistance


The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Source Content uid UC1844J Pbfree Code Yes
Rohs Code No Part Life Cycle Code Active
Ihs Manufacturer TEXAS INSTRUMENTS INC Part Package Code DIP
Package Description DIP, DIP8,.3 Pin Count 8
Reach Compliance Code not_compliant ECCN Code EAR99
HTS Code 8542.39.00.01 Samacsys Manufacturer Texas Instruments
Control Technique PULSE WIDTH MODULATION Input Voltage-Max 30 V
Input Voltage-Min 11 V Input Voltage-Nom 15 V
JESD-30 Code R-GDIP-T8 JESD-609 Code e0
Length 9.58 mm Number of Functions 1
Number of Terminals 8 Operating Temperature-Max 125 °C
Operating Temperature-Min -55 °C Output Current-Max 1 A
Output Voltage-Nom 5 V Package Body Material CERAMIC, GLASS-SEALED
Package Code DIP Package Equivalence Code DIP8,.3
Package Shape RECTANGULAR Package Style IN-LINE
Peak Reflow Temperature (Cel) NOT SPECIFIED Qualification Status Not Qualified
Seated Height-Max 5.08 mm Supply Current-Max (Isup) 25 mA
Supply Voltage-Max (Vsup) 30 V Supply Voltage-Min (Vsup) 12 V
Surface Mount NO Switcher Configuration BUCK-BOOST
Switching Frequency-Max 500 kHz Technology BICMOS
Temperature Grade MILITARY Terminal Finish Tin/Lead (Sn/Pb)
Terminal Form THROUGH-HOLE Terminal Pitch 2.54 mm
Terminal Position DUAL Time@Peak Reflow Temperature-Max (s) NOT SPECIFIED
Width 7.62 mm

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