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CMPWR150SAT Datasheet(PDF) 5 Page - California Micro Devices Corp |
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CMPWR150SAT Datasheet(HTML) 5 Page - California Micro Devices Corp |
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5 / 8 page  © 1999 California Micro Devices Corp. All rights reserved. 9/99 215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 5 CMPWR150 CALIFORNIA MICRO DEVICES When V AUX is present, the VCC supply current is less than 10µA until V CC exceeds VAUX, at which point VCC then powers the controller (0.15mA). When V CC reaches VSELECT, the regulator is enabled. Typical Transient Characteristics The transient characterization test set-up shown below includes the effective source impedance of the V CC supply (R S). This was measured to be approximately 0.2Ω. It is recommended that this effective source impedance be no greater than 0.25Ω to ensure precise switching is maintained during V CC selection and deselection. Both the rise and fall times during V CC power-up/down sequencing were controlled at a 20 millisecond duration. This is considered to represent worst case conditions for most application circuits. A maximum rated load current of 500mA was used during characterization, unless specified otherwise. Typical DC Characteristics (continued) Figure 4. V CC Supply Current (No Load). During a selection or deselection transition, the DC load current is switching from V AUX to VCC and vice versa. In addition to the normal load current, there may also be an in-rush current for charging/discharging the load capacitor. The total current pulse being applied to either V AUX or VCC is equal to the sum of the dc load and the corresponding in- rush current. Transient currents in excess of 1.0 amps can readily occur for brief intervals when either supply commences to power the load. The oscilloscope traces of V CC power-up/down show the full bandwidth response at the V CC and VOUT pins under full load (500mA) conditions. See Application Note AP-211 for more information. V CC Power-up Cold Start. Figure 5 shows the output response during an initial V CC power-up with VAUX not present. When V CC reaches the select threshold, the regulator turns on. The uncharged output capacitor causes maximum in-rush current to flow, resulting in a large voltage disturbance at the V CC pin of about 230mV. The built-in hysteresis of 250mV ensures the regulator remains enabled throughout the transient. Prior to V CC reaching an acceptable logic supply level (2V), a disturbance on the Drive pin can be observed. Figure 5. V CC Power-up Cold Start. F V CC Supply Current of the device is shown across the entire VCC range for both V AUX present (3.3V) and absent (0V) in Figure 4. In the absence of V AUX, the supply current remains fixed at approximately 0.15mA until V CC reaches the Select voltage threshold of 4.35V. At this point the regulator is enabled and a supply current of 1.0mA is conducted. Transient Characteristics Test Set-up CMPWR150 |
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