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MIC3838

Push-Pull DC/DC Controller w/Turn On Threshold of 12.5V

Status: In Production

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
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Overview
Documents
Development Environment
RoHS Information
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Device Overview

Summary

The MIC3838/39 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.

Additional 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
Parametrics
Name
Value
Supported Topologies
Push-Pull, Half Bridge, Full Bridge
Supported Outputs
1
Minimum Input Voltage (V)
8.3
Maximum Input Voltage (V)
15
Duty Cycle Max (%)
0.49
Operating Frequency (Hz)
Adj. to 1MHz
Soft Start
True
Internal Voltage Bias
True
Current Limit / Short Circuit Protection
True
Input UVLO Typ (V)
12.5
Operating Supply Current (mA)
1.5
Package
10/MSOP

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (Kg)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
MIC3838YMM
0.024500
0.135600
10
MSOP
3x3x1.0mm
NiPdAu
e4
MIC3838YMM-TR
0.024500
0.431180
10
MSOP
3x3x1.0mm
NiPdAu
e4
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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