MIC3839

The MIC3838 and MIC3839 are a family of complementary output push-pull PWM control ICs that feature high speed and low power consumption. The MIC3838/9 are ideal for telecom level (36V to 75V) isolated step down DC/DC conversion applications where high output current, small size, and high efficiency are required The MIC3838/9 are designed for high flexibility with minimum pin-count. The devices are easily configurable for either voltage-mode or current-mode control. Additionally, the MIC3838/9 can easily implement a volt-second clamp that automatically limits the duty cycle during input transients, allowing designers to use the smallest possible transformers and power components. A 3V reference output is also available that eliminates the need for an external reference. The dual-ended push-pull architecture of the MIC3838/9 allows more efficient utilization of the transformer than single-ended topologies, allowing smaller size DC/DC solutions. Additionally, the out-of-phase push-pull topology allows a higher effective duty cycle, reducing input and output ripple as well as stress on the external components. The dead-time between the two outputs is adjustable between 60ns to 200ns, limiting the duty cycle of each output stage to less than 50%. The MIC3838 has a turn-on threshold of 12.5V whereas the MIC3839 has a lower turn-on threshold of 4.3V. Both devices are available in a small size MSOP-10 package with an operating range of -40°C to +85°C.

Features
  • Dual output drive stages in push-pull configuration
  • Configurable for current-mode or voltage-mode control
  • Easily implements volt-second clamp
  • Leading edge current-sense blanking
  • 3V reference output available
  • 130µA typical start-up current
  • 1mA typical run current
  • Operation to 1MHz
  • On-chip error amplifier with 4MHz gain bandwidth product
  • Internal soft start
  • On-chip VDD clamping
  • Output drive stages capable of 500mA peak source current, 1A peak sink current
Parameter
Parameter Name Value Value
Supported Topologies Push-Pull, Half Bridge, Full Bridge Push-Pull, Half Bridge, Full Bridge
Supported Outputs 1 1
Minimum Input Voltage (V) 4.1 4.1
Maximum Input Voltage (V) 15 15
Duty Cycle Max (%) 0.49 0.49
Operating Frequency (Hz) Adj. to 1MHz Adj. to 1MHz
Soft Start True True
Internal Voltage Bias True True
Current Limit / Short Circuit Protection True True
Input UVLO Typ (V) 4.3 4.3
Operating Supply Current (mA) 1.5 1.5
Package 10/MSOP 10/MSOP
Documents
MIC3838/3839 - Flexible Push-Pull PWM ControllerData Sheets11/09/2015190KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MIC3839YMM10MSOP-40C to +85CTUBE**********
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC3839YMM-TR0.0245000.43118010MSOP3x3x1.0mmNiPdAue4
MIC3839YMM0.0245000.13560010MSOP3x3x1.0mmNiPdAue4
MIC3838/3839 - Flexible Push-Pull PWM Controller MIC3839