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)
- 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 to +85).
• 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
• 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 Plus Anneal Available (RoHS Compliant)Application• 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 ModulesPinout
SpecificationsBias Voltage, VBias . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +15.0V
Boot Voltage, VBOOT. . . . . . . . . . . . . . . . . . GND - 0.3V to +36.0V
TGATE Voltage, VTGATE . . . . . . . . . . . . VLX - 0.3V to VBOOT + 0.3V
BGATE/BSOC Voltage, VBGATE/BSOC . . . . GND - 0.3 to VBias + 0.3V
LX Voltage, VLX . . . . . . . . . . . . . . . . . .GND - 0.3V to VBOOT + 0.3V
Upper Driver Supply Voltage, VBOOT - VLX . . . . . . . . . . . . . . . 15V
Clamp Voltage, VBOOT - VBias . . . . . . . . . . . . . . . . . . . . . . . .. . 24V
FB, COMP/EN Voltage . . . . . . . . . . . . . . . . . .. . . . GND - 0.3V to 6V
ESD Classification, HBM . . . . . . . . . . . . . . . . . . . . . . ... . . . . . 1.5kV
ESD Classification, MM . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . 150V
ESD Classification, CDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0kV
CAUTION: Stresses above those listed in "Absolute MaximumRatings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
DescriptionThe ISL8105A is a simple single-phase PWM controller for a synchronous buck converter. The ISL8105A operates from +5V or +12V bias supply voltage. With integrated linear regulator, boot diode, and N-channel MOSFET gate drivers, the 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 ISL8105A features the capability of safe start-up with pre-biased load. The ISL8105A 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.
ISL8105A Data Sheet
