Device Information
 
 
ISL8105B Printer Friendly Version
 
+5V or +12V Single-Phase Synchronous Buck Converter PWM Controller with Integrated MOSFET Gate Drivers, Extended Soft-Start Time
 
Datasheets,
Related Docs
& Simulations		DescriptionKey
Features		Parametric
Data		Application
Diagrams		Related
Devices
 
 
Ordering Information
 iBuy direct from Intersil  iBuy direct - out of stock  Request samples
 Check distributor inventory Green/Pb(Lead free) Device  Available in RoHS/Pb-Free  
Part No. Design-In
Status		 Temp. Package MSL Price
US $		 PB Free
ISL8105BCBZ Active Comm 8 Ld SOIC 1 0.89 PB Free Out of stock Disti-Buy Sample
ISL8105BCBZ-T Active Comm 8 Ld SOIC T+R 1 0.89 PB Free Out of stock Disti-Buy  
ISL8105BCRZ Active Comm 10 Ld DFN 1 0.95 PB Free Disti-Buy Sample
ISL8105BCRZ-T Active Comm 10 Ld DFN T+R 1 0.95 PB Free Disti-Buy  
ISL8105BEVAL1Z Active   Eval Board N/A Contact Us PB Free Disti-Buy  
ISL8105BEVAL2Z Active   Eval Board N/A Contact Us PB Free Buy Direct Disti-Buy  
ISL8105BIBZ Active Ind 8 Ld SOIC 1 1.17 PB Free Out of stock Disti-Buy Sample
ISL8105BIBZ-T Active Ind 8 Ld SOIC T+R 1 1.17 PB Free Disti-Buy  
ISL8105BIRZ Active Ind 10 Ld DFN 1 1.22 PB Free Out of stock Disti-Buy Sample
ISL8105BIRZ-T Active Ind 10 Ld DFN T+R 1 1.22 PB Free Disti-Buy  
The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.
MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020
SMD = Standard Microcircuit Drawing
 
  Description

The ISL8105B 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 ISL8105B 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. The controller operates with a fixed switching frequency of 300kHz.

The ISL8105B 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.

 
  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)
    • 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 300kHz Operating Frequency
  • 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)
Related Documentation
 
Datasheet(s)   Datasheet(s):
 
Evaluation Board(s)   Evaluation Board(s):
 
 
  Parametric Data
VIN (min) (V)1
VIN (max) (V)12
VOUT (min) (V).6
VOUT (max) (V)5
IOUT (max) (A)25
VBIAS (V)5, 12
IS (typ) (mA)3.2
 
  Application Block Diagrams
 
 
 
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
 
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