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FDG326P Scheda tecnica(PDF) 7 Page - Texas Instruments |
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FDG326P Scheda tecnica(HTML) 7 Page - Texas Instruments |
7 / 29 page IN3 OUT3 FB1 FB2 TPS75003-EP www.ti.com SGLS311A – DECEMBER 2006 – REVISED MARCH 2011 PIN FUNCTIONS PIN DESCRIPTION NAME RHL Ground connection for BUCK1 and BUCK2 converters. Pins 6 and 15 should be connected to the back side DGND 6, 15, PAD exposed pad by a short metal trace as shown in the PCB Layout section of this data sheet. AGND 18 Ground connection for LDO IN1 13 Input supply to BUCK1 IN2 8 Input supply to BUCK2 IN3 20 Input supply to LDO Driving the enable pin (ENx) high turns on BUCK1 regulator. Driving this pin low puts it into shutdown mode, EN1 17 reducing operating current. The enable pin does not trigger on fast negative going transients. EN2 4 Same as EN1 but for BUCK2 controller EN3 3 Same as EN1 but for LDO Connecting a capacitor between this pin and ground increases start-up time of the BUCK1 regulator by slowing SS1 16 the ramp-up of current limit. This high-impedance pin is noise-sensitive; careful layout is important. See the Typical Characteristics, Applications, and PCB Layout sections for details. SS2 5 Same as SS1 but for BUCK2 regulator. Connecting a capacitor from this pin to ground slows the start-up time of the LDO reference, therby slowing SS3 19 output voltage ramp-up. See the Applications section for details. Current sense input for BUCK1 regulator. The voltage difference between this pin and IN1 is compared to an IS1 12 internal reference to set current limit. For a robust output start-up ramp, careful layout and bypassing are required. See the Applications section for details. IS2 9 Same as IS1, but compared to IN2 and used for BUCK2 controller SW1 14 Gate drive pin for external BUCK1 P-channel MOSFET SW2 7 Same as SW1, but for BUCK2 controller FB1 11 Feedback pin. Used to set the output voltage of BUCK1 regulator FB2 10 Same as FB1, but for BUCK2 controller FB3 2 Same as FB1, but for LDO Regulated LDO output. A small ceramic capacitor ( ≥ 2.2 μF) is needed from this pin to ground to ensure OUT3 1 stability. Copyright © 2006–2011, Texas Instruments Incorporated 7 Product Folder Link(s): TPS75003-EP |
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