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34708 Datasheet(PDF) 70 Page - Freescale Semiconductor, Inc |
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34708 Datasheet(HTML) 70 Page - Freescale Semiconductor, Inc |
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70 / 159 page  Analog Integrated Circuit Device Data Freescale Semiconductor 70 MC34708 Functional Block Description 7.5.6.7 VUSB2 VUSB2 has an internal PMOS pass FET which will support loads up to 65 mA. To support load currents an external PNP is provided. The external PNP configuration is offered to avoid excess on-chip power dissipation at high loads and large differentials between BP and output settings. For lower current requirements, an integrated PMOS pass FET is included. The input pin for the integrated PMOS option is shared with the base current drive pin for the PNP option. The external PNP configuration must be committed as a hardwired board level implementation. The recommended PNP device is the ON Semiconductor™ NSS12100XV6T1G, which is capable of handling up to 250 mW of continuous dissipation, at minimum footprint and 75 °C of ambient. For use cases where up to 500 mW of dissipation is required, the recommended PNP device is ON Semiconductor NSS12100UW3TCG. For stability reasons, a small minimum ESR may be required. A short-circuit condition will shut down the VUSB2 regulator and generate an interrupt for SCPI. The nominal output voltage of this regulator is SPI configurable, and can be 2.5 V, 2.6 V, 2.75 V, or 3.0 V. The output current when working with the internal pass FET is 65 mA, and could be up to 350 mA when working with an external PNP. VREFDDRL TRANSIENT Transient Load Response •VIN = VINMIN, VINMAX - 5.0 - mV Notes 58. guaranteed at 25 °C only Table 59. VUSB2 Voltage Control Parameter Value Output Voltage ILoad max VUSB2CONFIG = 0 Internal Pass FET VUSB2CONFIG = 1 External PNP VUSB2[1:0] 00 2.5 V 65 mA 350 mA 01 2.6 V 65 mA 350 mA 10 2.75 V 65 mA 350 mA 11 3.00 V 65 mA 350 mA Table 60. VUSB2 Electrical Specification Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C TA 85 C, unless otherwise noted. Typical values at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted. Symbol Characteristic Min Typ Max Unit Notes GENERAL VUSB2IN Operating Input Voltage Range VINMIN to VINMAX VNOM + 0.25 - 4.5 V IUSB2 Operating Current Load Range ILMIN to ILMAX • Internal pass FET • External PNP Not exceeding PNP max power 0.0 0.0 - - 65 350 mA VUSB2IN Extended Input Voltage Range • Performance may be out of specification UVDET - 4.5 V VUSB2 ACTIVE MODE - DC VUSB2 Output Voltage VOUT •VINMIN < VIN < VINMAX ILMIN < IL < ILMAX VNOM - 3% VNOM VNOM + 3% V Table 58. VREFDDR Electrical Specification Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C TA 85 C, unless otherwise noted. Typical values at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted. Symbol Characteristic Min Typ Max Unit Notes |
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