ISL8115

High Voltage Synchronous Buck PWM Controller with Integrated Gate Driver and Current Sharing

Product Status: Mass Production

OVERVIEW

The ISL8115 is a synchronous buck PWM controller with current sharing capability. The current sharing function allows multiple modules to be connected in parallel to achieve higher output current and to reduce input and output ripple current, resulting in fewer components and reduced output dissipation.

Utilizing voltage-mode control with input voltage feed-forward compensation, the ISL8115 maintains a constant loop gain for optimal transient response, especially for applications with a wide input voltage range.

The ISL8115 protects against overcurrent conditions by inhibiting the PWM operation while monitoring the current with DCR of the output inductor, or a precision resistor. It also has a pre-POR overvoltage protection option, which provides some protection to the load if the upper MOSFET(s) is shorted.

The ISL8115 features remote ground sensing, programmable input voltage UVLO, output under/overvoltage protection, power-good indication, and fault Hand Shake capability.

KEY FEATURES

    $Wide VIN range operation: 2.97V to 36V; up to 5.5V output and 30A load current per phaseFast transient response$Voltage-mode PWM leading-edge modulation with non-linear control$Input voltage feed-forwardIntegrated 5V high speed 4A MOSFET gate drivers$Internal bootstrap diodeExcellent output voltage regulation$0.6V ±1.0% internal reference (-40°C ~ 125°C)$0.6V ±0.7% internal reference (-40°C ~ 105°C)$Differential voltage sensingExcellent current balancing and overcurrent protection$Peak and average overcurrent protection$Output current monitor on the ISET pinOscillator programmable from 150kHz to 1.5MHz$Frequency synchronization to external clock signalDiode emulation mode for light load efficiency improvementPower-good open drain outputPre-bias start-up functionOutput OVP, UVP; OTPAdjustable Soft-Start

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8115
Basic Information
Production Status
Mass Production
Input Voltage Min (V)
2.97
Input Voltage Max (V)
36
Output Voltage Min (V)
0.6
Output Voltage Max (V)
5.5
Output Current Max (A)
30
VBIAS (min)
2.97 V
VBIAS (max) (V)
5.5
IS (typ)
10 mA
Parametric Applications
Current sharing capability up to 6 phases
Qualification Level
Standard
VID
No VID
Bias Voltage Range (V)
2.97 to 5.5
Temperature Range
-40 to +125

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