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MB3889

Features: • Built-in timer-latch overcurrent protection circuit (requiring no current sense resistor)• Built-in timer-latch overvoltage protection circuit• Synchronous rectification system providing high efficiency• Power supply voltage range: 5.5 V to 18 V• PWRGOOD t...

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SeekIC No. : 004413319 Detail

MB3889: Features: • Built-in timer-latch overcurrent protection circuit (requiring no current sense resistor)• Built-in timer-latch overvoltage protection circuit• Synchronous rectificatio...

MB3889 Data Sheet

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Part Number:
MB3889
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/27

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Product Details

Description



Features:

• Built-in timer-latch overcurrent protection circuit (requiring no current sense resistor)
• Built-in timer-latch overvoltage protection circuit
• Synchronous rectification system providing high efficiency
• Power supply voltage range: 5.5 V to 18 V
• PWRGOOD terminals (open-drain) to output the protection status
• Symmetrical-phase system reducing the input capacitor loss
• Built-in channel control function
• Reference voltage: 3.5 V ± 1 %
• Error amplifier threshold voltage: 1.23 V ± 1 % (0 °C to + 85 °C)
• Support for frequency setting using an external resistor (Frequency setting capacitor integrated)
• Oscillation frequency range: 100 kHz to 500 kHz
• Built-in circuit for load-independent soft-start and discharge control
• Built-in totem-pole output for Nch MOS FET


Pinout

Connection Diagram


Specifications

Parameter Symbol Conditions Rating Unit
Min Max
Power-supply voltage VCC - - 20 V
Boot voltage VCB CB terminal - 25 V
Output current IO - - 120 mA
Peak output current IOP Duty 5%
(t = 1 / fOSC * Duty)		 - 800 mA
Power dissipation PD Ta +25 °C - 1390* mW
Storage temperature Tstg - -55 +125 °C


* : The packages are mounted on the dual-sided epoxy board (10 cm * 10 cm) .

WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.




Description

The MB3889 is a symmetrical-phase type of two-channel, DC/DC converter IC using pulse width modulation (PWM) , incorporating an overcurrent protection circuit (requiring no current sense resistor) and an overvoltage protection circuit. Providing high output driving capabilities, the MB3889 is suitable for down-conversion.

The MB3889 adopts both synchronous rectification to provide high efficiency and symmetrical phasing (two antiphase triangular waves) which contributes to making the input capacitor small.

The MB3889 contains a 5-volt regulator resulting in a reduced number of components used. It also contains a variety of protection features which output the protection status upon detection of an overvoltage or overcurrent while reducing the number of external protective devices required.

The MB3889 is an ideal built-in power supply for driving products with high speed CPU's such as home TV game devices and notebook PC's.

The MB3889 is covered by US Patent Number 6,147,477.




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