ISL8105
+5V or +12V Single-Phase Synchronous Buck Converter PWM Controller with Integrated MOSFET Gate Drivers
Key Features
- 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
- 0.6V Internal Reference Voltage
- ±1.0% Tolerance Over the Commercial Temperature Range (0°C to +70°C)
- ±1.5% Tolerance Over the Industrial Temperature Range (-40°C to +85°C).
- Integrated MOSFET Gate Drivers that Operate from VBIAS (+5V to +12V)
- Bootstrapped High-side Gate Driver with Integrated Boot Diode
- Drives N-Channel MOSFETs
- Simple Voltage-Mode PWM Control
- Traditional Dual Edge Modulation
- Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
- Fixed Operating Frequency
- 300kHz for ISL8105
- 600kHz for ISL8105A
- Fixed Internal Soft-Start with Pre-biased Load Capability
- Lossless, Programmable Overcurrent Protection
- Uses Bottom-side MOSFET's rDS(ON)
- Enable/Disable Function Using COMP/EN Pin
- Output Current Sourcing and Sinking Currents
- Pb-Free (RoHS Compliant)
Description
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.
Applications
- 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
