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TPS54910PWPG4 Datasheet(PDF) 8 Page - Texas Instruments

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Part # TPS54910PWPG4
Description  3-V TO 4-V INPUT, 9-A OUTPUT SYNCHRONOUS BUCK PWM SWITCHER WITH INTEGRATED FETs
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54910PWPG4 Datasheet(HTML) 8 Page - Texas Instruments

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TPS54910
SLVS421C − MARCH 2002 − REVISED FEBRUARY 2005
www.ti.com
8
APPLICATION INFORMATION
Figure 10 shows the schematic diagram for a typical
TPS54910 application. The TPS54910 (U1) can provide
up to 9 A of output current at a nominal output voltage of
1.8 V. For proper thermal performance, the exposed
thermal PowerPAD underneath the integrated circuit,
TPS54910, package must be soldered to the
printed-circuit board.
28
6
VIN
24
23
22
21
20
VIN
VIN
VIN
VIN
14
13
12
11
10
9
8
7
PH
PH
PH
PH
PH
PH
PH
PH
PH
5
BOOT
19
18
17
16
15
PGND
PGND
PGND
PGND
PGND
POWERPAD
AGND
VSENSE
COMP
PWRGD
SS/ENA
SYNC
RT
27
26
VBIAS
25
4
3
2
1
U1
TPS54910PWP
0.047 µF
C9
0.047 µF
L1
0.65 µH
C8
22 µF
C10
10 µF
C12
10 µF
VO
3300 pF
VI
R7
2.4 Ω
C11
3300 pF
C7
22 µF
C5
22 µF
R6
71.5 kΩ
C6
1 µF
C3
R7
10 kΩ
C4
R3
10 kΩ
150 pF
C2
R2
301 Ω
1000 pF
C1
R1
10 Ω
R4
9.76 kΩ
Analog and Power Grounds Are Tied at the Pad Under the Package of IC
Figure 10. Application Circuit
COMPONENT SELECTION
The values for the components used in this design
example were selected for best load transient response
and small PCB area. Additional design information is
available at www.ti.com.
INPUT FILTER
The input voltage is a nominal 3.3 VDC. The input filter
(C10) is a 10-µF ceramic capacitor (Taiyo Yuden). C12 is
also a 10-µF ceramic capacitor (Taiyo Yuden) that
provides high-frequency decoupling of the TPS54910
from the input supply. C12 must be located as close as
possible to the device. Ripple current is carried in both C10
and C12, and the return path to PGND must avoid the
current circulating in the output capacitors C5, C7, and C8.
FEEDBACK CIRCUIT
The values for these components are selected to provide
fast transient response times.
The resistor divider network of R1 and R4 sets the output
voltage for the circuit at 1.8 V. R1 along with R2, R3, C1,
C2, and C4 forms the loop compensation network for the
circuit. For this design, a Type-3 topology is used.
OPERATING FREQUENCY
In the application circuit, RT is grounded through a 71.5-kΩ
resistor to select the operating frequency of 700 kHz. To
set a different frequency, place a 68-kΩ to 180-kΩ resistor
between RT (pin 28) and analog ground or leave RT
floating to select the default of 350 kHz. The resistance can
be approximated using the following equation:
R +
500 kHz
Switching Frequency
100 [kW]
(1)


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