ISL8106

Wide VIN, 7V to 25V, Single-Phase PWM Controller with Integrated MOSFET Drivers

OVERVIEW

The ISL8106 is a Single-Phase Synchronous-Buck PWM Controller with a input voltage range of +7.0V to +25.0V featuring Intersil's Robust Ripple Regulator (R3 ) technology that delivers exceptional dynamic response to input voltage and output load transients. Integrated MOSFET drivers, 5V LDO, and bootstrap diode result in fewer components and smaller implementation area for power supply systems.

The ISL8106 features a 1.5ms digital soft-start and can be started into a pre-biased output voltage. A resistor divider is used to program the output voltage setpoint. The ISL8106 can be configured to operate in forced-continuousconduction- mode (FCCM) or in diode-emulation-mode (DEM), which improves light-load efficiency. In FCCM the controller always operates as a synchronous rectifier, switching the bottom-side MOSFET regardless of the output load. With DEM enabled, the bottom-side MOSFET is disabled preventing negative current flow from the output inductor during low load operation. This makes the ISL8106 an excellent choice for all "green" applications. An audio filter prevents the PWM switching frequency from entering the audible spectrum due to extremely light load while in DEM.

A PGOOD pin featuring a unique fault-identification capability significantly reduces system trouble-shooting time and effort. The pull-down resistance of the PGOOD pin is 30Ω for an overcurrent fault, 60Ω for an overvoltage fault, or 90Ω for either an undervoltage fault or during soft-start. Overcurrent protection is accomplished by measuring the voltage drop across the rDS(ON) of the bottom-side MOSFET. A single resistor programs the overcurrent and short-circuit points. Overvoltage and undervoltage protection is monitored at the FB voltage feedback pin.

KEY FEATURES

  • Wide input voltage range: +7.0V to +25.0V
  • High performance R3 technology delivers extremely fast transient response
  • +0.6V Internal Reference
  • ±0.6% tolerance over the commercial temperature Range (0°C to +70°C)
  • ±1.0% tolerance over the industrial temperature range (-40°C to +85°C)
  • Output voltage range: +0.6V to VCC-0.3V
  • Selectable forced continuous conduction mode or diode emulation mode
  • Integrated MOSFET drivers with shoot-through protection
  • External type-two loop compensation
  • Internal 5V low-dropout regulator with Integrated bootstrap diode
  • Programmable PWM frequency: 200kHz to 600kHz
  • PWM minimum frequency above audible spectrum
  • Internal digital soft-start with prebiased startup capability
  • Power good monitor with fault identification by PGOOD pull down resistance
  • Lossless, programmable overcurrent protection
  • Uses bottom-side MOSFET's rDS(ON)
  • Undervoltage protection, soft crowbar overvoltage protection and over-temperature protection
  • Pb-free plus anneal available (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8106
Basic Information
Production Status
Mass Production
iSim Model
YES
Input Voltage Min (V)
7
Input Voltage Max (V)
25
Output Voltage Min (V)
0.6
Output Voltage Max (V)
3.3
Output Current Max (A)
12
VBIAS (min)
5 V
VBIAS (max) (V)
5
IS (min)
2 mA
IS (typ)
2.2 mA
Qualification Level
Standard
VID
No
Bias Voltage Range (V)
N/A (Internal)
Can Sample
YES
Temperature Range
-40 to +85

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