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It is recommended that a minimum capacitance of 0. It is primarily designed for computer applications powered from an ATX power supply. See Tech Brief TB Select a package and heatsink that maintains the junction temperature below the rating with a maximum expected ambient temperature. Connect this pin to the VTT output at the physical point datasheet desired regulation. Information furnished datsheet Intersil is believed to be accurate and reliable. Initialization The ISL automatically initializes upon receipt of input power.

This reset lasts for three soft start cycles, which is typically 24ms one soft start cycle is typically 8. This method allows the VDDQ regulator to both source and sink current.

The voltage at this pin is regulated to 0.

The maximum rDS ON at the highest junction temperature. Minimizing the response time can minimize the output capacitance required.

When attempting to restart a faulted regulator, the ISL will follow the preset start up sequencing. The goal of the compensation network is to provide a closed loop transfer function with the highest 0dB crossing frequency f0dB and adequate phase margin.

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 may result from datwsheet use. The power dissipation includes two loss components; datashfet loss and switching loss.


Graphics cards – GPU and memory supplies? These voltage spikes can degrade efficiency, radiate noise into the circuit, and lead to device over-voltage stress. Figure 2 shows the connections ag9173 the critical components in the converter. I is the output inductor ripple current.

Use the remaining printed circuit layers for small signal wiring. High ground currents are conducted directly through the exposed paddle of the QFN package which must be electrically connected to the ground plane through a path as low in inductance as possible.

Phase margin is the difference between the closed loop phase at f0dB and degrees. Special sequencing of the input supplies is not necessary. If the disabled regulator is used as the input for another regulator, then that cascoded regulator will also experience a fault condition due to a loss of input.

Doing so may interfere with daatasheet shootthrough protection.

(PDF) AT9173 Datasheet download

Nd and Ne refer to the number of terminals on each D and E. All references to timing in this datasheef are in reference to Figure 1.

L minus L1 to be equal to or greater than 0. The ISL will immediately shut down when the Fault Counter reaches a count of 4 when the system is restarting from an S5 state into the active, or S0, state. For reliable operation, select bulk capacitors with voltage and current ratings above the maximum input voltage and largest RMS current required by the circuit. The bulk filter capacitor values are generally determined by the ESR Effective Series Resistance and voltage rating requirements rather than actual capacitance requirements.

These capacitors must be capable of handling the surge-current at power-up.


Check the compensation gain at FP2 with the capabilities of the error amplifier. However, the Equivalent Series Inductance ESL of these capacitors increases with case size and can reduce the usefulness of the capacitor to high slew-rate transient loading. The power plane should support the input power and output power nodes.


Ensure that both MOSFETs are within their maximum junction temperature at high ambient temperature by calculating the temperature rise according to package thermal-resistance specifications.

The response time is the time required to slew the inductor current from an initial current value to the transient current level. Under and Over-voltage Monitoring on All Outputs? High frequency capacitors initially supply the transient and slow the current load rate seen dztasheet the bulk capacitors.


A kHz Synchronous Buck Regulator with a precision 0. Shoot-Through Protection A shoot-through condition occurs when both the upper and lower MOSFETs are turned on simultaneously, effectively shorting the input voltage to ground. Using the above guidelines should give a Compensation Gain similar to the curve plotted. Integrated Thermal Shutdown Protection?

It is typically connected to the 5V standby rail of an ATX power supply. This allows the termination voltage to float during the S3 sleep state. The following equations give the approximate response time interval for application and removal of a transient load: The over-current function cycles the soft-start function in a hiccup mode to provide fault protection.

All dimensions are in millimeters. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. Any parasitic inductance in the switched current path generates a large voltage spike during the switching interval.

For information regarding Intersil Corporation and its products, see www.