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FDG326P Scheda tecnica(PDF) 7 Page - Texas Instruments

Il numero della parte FDG326P
Spiegazioni elettronici  Triple-Supply Power Management IC for Powering FPGAs and DSPs
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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FDG326P Scheda tecnica(HTML) 7 Page - Texas Instruments

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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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