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Select a package and heatsink that maintains the datashret temperature below the rating with a maximum expected ambient temperature. There are two sets of critical components in the ISL switching converter. 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. There is no need for external programming resistors.

AT datasheet, Pinout ,application circuits Bus Termination Regulator

Unfortunately, ESL is not a specified parameter. For reliable operation, select bulk capacitors with voltage and current ratings above the maximum input voltage and largest Datashret current required by the circuit.

The open loop error amplifier gain bounds the compensation gain.

This is equivalent to multiplying the modulator transfer function to the compensation transfer function and plotting the gain. The VDDQ regulator also has overcurrent protection. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which catasheet result from its use.


Use copper filled polygons on the top and bottom circuit layers for the phase nodes. Thermal shutdown is integrated.

The pin 1 identifier may be either a mold or mark feature. Use the remaining printed circuit layers for small signal wiring. The important parameters for the bulk input capacitance datasneet the voltage rating and the RMS current rating.

Bus Termination Regulator

Minimize the length of the connections between the input capacitors, CIN, and the power switches by placing them nearby. This reset lasts for three soft start cycles, which is typically 24ms one soft start cycle is typically 8. It is important to note that the VTT rail may not bleed down to 0V.

The maximum RMS current required by the datashset may be closely approximated through the following equation: For information regarding Intersil Corporation and its products, see www.

In high-current applications, the MOSFET power dissipation, package selection and heatsink are the dominant design factors. If a regulator is already in regulation, then it will not be affected by the start up sequencing.

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All Rights Reserved All other trademarks mentioned are the property of their respective owners. Do not insert any circuitry between this pin and the gate of the lower MOSFET, as it may interfere with the internal adaptive shoot-through protection circuitry and render it ineffective.

Each regulator is enabled and soft-started according to a preset sequence. Check the compensation gain at FP2 with the capabilities of the error amplifier. The following equations give the approximate response time interval for application and removal of a datashete load: I is the output inductor ripple current.


This pin is also monitored by the adaptive shootthrough protection circuitry to determine when the lower MOSFET has turned off. These should be selected based upon rDS ONgate supply requirements, and thermal management requirements.

The amount of capacitance and type of capacitor should be chosen with this criteria in mind. Approximate Losses while Sourcing current 2 1 -? Use these datasheeh for locating the poles and zeros of the compensation network: A kHz Synchronous Buck Regulator with a precision 0.

The power dissipation includes two loss components; conduction loss and switching loss. L minus L1 to be equal to or greater at973 0. Initialization The ISL automatically initializes upon receipt of input power. The synchronous buck converter uses voltagemode control with fast transient response. This method provides a rapid and controlled output voltage rise. Graphics cards – GPU and memory supplies?

The minimum value for CSS can be found through the following equation: Doing ah9173 may interfere with the shootthrough protection. Information furnished by Intersil is believed to be accurate and reliable.

It is typically connected to the 5V standby rail of datazheet ATX power supply. The ripple voltage and current are approximated by the following equations: Use only specialized low-ESR capacitors datasheer for switching-regulator applications for the bulk capacitors.