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ISL8105A
600kHz, Single-Phase Sync Buck Converter PWM Controller with Integrated MOSFET Gate Drivers

热度 45

The ISL8105, ISL8105A is a simple single-phase PWM controller for a synchronous buck converter. It operates from +5V or +12V bias supply voltage. With integrated linear regulator, boot diode, and N-Channel MOSFET gate drivers, the ISL8105, ISL8105A reduces external component count and board space requirements. These make the IC suitable for a wide range of applications.

Utilizing voltage-mode control, the output voltage can be precisely regulated to as low as 0.6V. The 0.6V internal reference features a maximum tolerance of ±1.0% over the commercial temperature range, and ±1.5% over the industrial temperature range. Two fixed oscillator frequency versions are available; 300kHz (ISL8105 for high efficiency applications) and 600kHz (ISL8105A for fast transient applications).

The ISL8105, ISL8105A features the capability of safe start-up with pre-biased load. It also provides overcurrent protection by monitoring the ON-resistance of the bottom-side MOSFET to inhibit PWM operation appropriately. During start-up interval, the resistor connected to BGATE/BSOC pin is employed to program overcurrent protection condition. This approach simplifies the implementation and does not deteriorate converter efficiency.

  • Operates from +5V or +12V Bias Supply Voltage
    • 1.0V to 12V Input Voltage Range (up to 20V possible with restrictions; see "Input Voltage Considerations" on page 9)
    • 0.6V to VIN Output Voltage Range
      • 5V or 12V DC/DC Regulators
      • Industrial Power Systems
      • Telecom and Datacom Applications
      • Test and Measurement Instruments
      • Distributed DC/DC Power Architecture
      • Point of Load Modules
 
Alternatives
Parameters ISL8105A ISL8105 ISL6545 ISL6545A
VIN (min) (V)1 1 1 1
VIN (max) (V)12 12 12 12
VOUT (min) (V)0.6 0.6 0.6 0.6
VOUT (max) (V)5 5 5 5
IOUT (max) (A)25 25 25 25
VBIAS (min)4.9 V 4.9 V 4.5 V 4.5 V
VBIAS (max)14.4 V 14.4 V 14.4 V 14.4 V
IS (typ)3.2 mA 3.2 mA 3.2 mA 3.2 mA
Qualification LevelStandard Standard Standard Standard

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