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The output is user-adjustable by means of external resistors down to 0. To avoid over-current tripping in the normal operating load range, find the ROCSET resistor from the equation above with: The over-current function cycles the soft-start function in a hiccup mode to provide fault protection.

The ripple voltage and current are approximated by the following equations: 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. Shoot-Through Protection A shoot-through datasheeet occurs when both the upper and lower MOSFETs are turned on simultaneously, effectively shorting the input voltage to ground.

Special sequencing of the input supplies is not necessary. Consult with the manufacturer of the load on specific decoupling requirements.

This is equivalent to multiplying the modulator transfer function to the compensation transfer function and plotting the gain. The lower switch realizes most of the switching losses when the converter is sinking current see the equations below.


In most cases, multiple electrolytic capacitors of small case size perform better than a single large case capacitor. The following equations give the approximate response time interval for application and removal of a transient load: A multi-layer printed circuit board is recommended.

ateg AME, Inc., ateg Datasheet

This transition is represented on Figure 1 at time t Dedicate another solid layer as a power plane and break this plane datashewt smaller islands of common voltage levels. All dimensions are in millimeters. These equations assume linear voltage-current transitions where IO is the maximum output current and VOUT is the nominal output voltage of the linear regulator.

If a regulator experiences any other fault condition an under-voltage or an overcurrent on VDDQthen that regulator, and only that regulator, will be disabled and an internal fault counter will be incremented by 1.

High frequency decoupling capacitors should be placed as close to the power pins of the load as physically possible.

The important parameters for the bulk input capacitance are the voltage rating and the RMS current xatasheet. Next are the small signal components which connect to sensitive nodes or supply critical bypass current and signal coupling.

Use only specialized low-ESR capacitors intended for switching-regulator applications for the bulk capacitors. The configuration of the pin 1 identifier is optional, but must be located within the zone indicated. The worst case response time can be either at the application or removal of load. Do not insert any circuitry between this pin and the gate of the upper MOSFET, as it may interfere with the internal adaptive shoot-through protection circuitry and render it ineffective.


With power devices switching efficiently at kHz, the resulting current transitions from one device to another cause voltage spikes across the interconnecting impedances and parasitic circuit elements. 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.

Depending on the method of lead termination at the edge of the package, a maximum 0. Integrated Thermal Shutdown Protection? The actual Modulator Gain has a high gain peak due to the high Q factor of eatasheet output filter and is not shown in Figure 6.

The FB pin is also monitored for under and over-voltage events.

Datasheet archive on 14-6-2011

Careful component datashert and printed circuit board design minimizes these voltage spikes. The initiation of soft start may affect other regulators. It is recommended that a minimum capacitance of 0.

This allows the heat to move away from the IC and also ties the pad to the ground plane through a low impedance path.

If the Fault Reset Counter reaches a count of ddatasheet another fault occurs, then the Fault Counter is cleared to 0.