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TPS54335 Datasheet(PDF) 4 Page - Texas Instruments

No. de pieza TPS54335
Descripción Electrónicos  4.5V to 28V Input, 3A Output, Synchronous Step Down SWIFT??Converter
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54335 Datasheet(HTML) 4 Page - Texas Instruments

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TPS54335
TPS54336
1
2
3
4
5
6
7
8
BOOT
VIN
PH
GND
RT
EN
COMP
VSENSE
PowerPAD
(9)
1
2
3
4
5
6
7
8
BOOT
VIN
PH
GND
SS
EN
COMP
VSENSE
PowerPAD
(9)
TPS54335
TPS54336
SLVSC03 – MAY 2013
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
The Electrical Ratings specified in this section will apply to all specifications in this document unless otherwise noted. These
specifications will be interpreted as conditions that will not degrade the device’s parametric or functional specifications for the
life of the product containing it. TJ = –40°C to +150°C, VIN =4.5 TO 28V, (unless otherwise noted)
PARAMETERS
CONDITIONS
MIN
TYP
MAX
UNIT
SWITCHING FREQUENCY
TPS54335
50
1500
kHz
TPS54335, Rrt = 100 k
384
480
576
kHz
Switching frequency range
TPS54335, Rrt = 1000 k
Ω, –40°C~105°C
40
50
60
kHz
TPS54335, Rrt = 30 k
1200
1500
1800
kHz
Internal switching frequency
TPS54336
272
340
408
kHz
SLOW START
Internal slow start time
TPS54335
2
ms
Slow start charge current
TPS54336
2.3
µA
PIN ASSIGNMENTS
8-PIN SOIC WITH THERMAL PAD
(TOP VIEW)
PIN FUNCTIONS
PIN
DESCRIPTION
NAME
NUMBER
A bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor is below the
BOOT
1
minimum required by the output device, the output is forced to switch off until the capacitor is
refreshed.
Vin
2
Input supply voltage, 4.5 V to 28 V.
PH
3
The source of the internal high side power MOSFET.
GND
4
Ground.
VSENSE
5
Inverting node of the gm error amplifier.
Error amplifier output, and input to the output switch current comparator. Connect frequency
COMP
6
compensation components to this pin.
EN
7
Enable pin. Float to enable.
RT (TPS54335)
8
Connect to an external timing resistor to adjust the switching frequency of the device.
Slow-start and tracking. An external capacitor connected to this pin sets the internal voltage reference
SS (TPS54336)
8
rise time. The voltage on this pin overrides the internal reference.
GND pin should be connected to the exposed thermal pad for proper operation. This thermal pad
Powerpad
9
should be connected to any internal PCB ground plane using multiple vias for good thermal
performance.
4
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Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: TPS54335 TPS54336


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