CS5160

http://onsemi.com

10

M 1.00 μs

Trace 1− Regulator Output Voltage (10 mV/div.)

Trace 2− Inductor Switching Node (5.0 V/div.)

Transient Response

provides unprecedented transient response to changes in

input voltage or output current. Pulse by pulse adjustment of

duty cycle is provided to quickly ramp the inductor current

to the required level. Since the inductor current cannot be

changed instantaneously, regulation is maintained by the

output capacitor(s) during the time required to slew the

inductor current.

For best transient response, a combination of a number of

high frequency and bulk output capacitors are usually used.

If the maximum on time is exceeded while responding to

a sudden increase in load current, a normal off time occurs

to prevent saturation of the output inductor.

Voltage Response to a 12 A Load Pulse

100 μs/div.

Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.)

Voltage Response to a 0 to 12 A Load Increase

10 μs/div.

Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.)

Trace 1− Inductor Switching Node (5.0 V/div.)

Voltage Response to a 12 to 0 A Load Decrease

10 μs/div.

Trace 2− Regulator Output Voltage (output set for 1.55 V, 20 mV/div.)

Trace 1− Inductor Switching Node (5 V/div.)

PROTECTION AND MONITORING FEATURES

To maintain predictable startup and shutdown

prevent the part from operating below 8.95 V minimum

and guarantees a 8.80 V minimum shutdown threshold.

Short Circuit Protection

A lossless hiccup mode short circuit protection feature is

provided, requiring only the Soft Start capacitor to

implement. If a short circuit condition occurs