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TPS65261RHBR Datasheet(PDF) 3 Page - Texas Instruments

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No. de pieza TPS65261RHBR
Descripción Electrónicos  4.5V to 18V Input Voltage, 3A/2A/2A Output Current Triple Synchronous Step-Down Converter
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65261RHBR Datasheet(HTML) 3 Page - Texas Instruments

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EN3
PGOOD
MODE
RESET
FB2
V7V
SS2
COMP2
32
9
31
10
30
11
29
12
28
13
27
14
26
15
25
16
24
1
23
2
22
3
21
4
20
5
19
6
18
7
17
8
FB1
COMP1
SS1
SS3
ROSC
AGND
FB3
COMP3
Thermal Pad
TPS65261, TPS65261-1
www.ti.com
SLVSCD3B – DECEMBER 2013 – REVISED MAY 2014
6 Pin Configuration and Functions
RHB PACKAGE
(TOP VIEW)
(There is no electric signal down bonded to thermal pad inside IC.
Exposed thermal pad must be soldered to PCB for optimal thermal performance.)
Pin Functions
PIN
DESCRIPTION
NO.
NAME
Enable for buck3. Float to enable. Can use this pin to adjust the input under-voltage lockout of buck3 with a resistor
1
EN3
divider.
An open drain output, asserts low if output voltage of any buck beyond regulation range due to thermal shutdown,
2
PGOOD
over-current, under-voltage or ENx shut down.
3
RESET
Open drain power failure output signal.
When high, an automatic power-up/power-down sequence is provided according to states of EN1, EN2 and EN3
4
MODE
pins.
5
V7V
Internal LDO for gate driver and internal controller. Connect a 1µF capacitor from the pin to power ground
6
FB2
Feedback Kelvin sensing pin for buck2 output voltage. Connect this pin to buck2 resistor divider.
Error amplifier output and Loop compensation pin for buck2. Connect a series resistor and capacitor to compensate
7
COMP2
the control loop of buck2 with peak current PWM mode.
Soft-start and tracking input for buck2. An internal 5µA pull-up current source is connected to this pin. The soft-start
8
SS2
time can be programmed by connecting a capacitor between this pin and ground.
Boot strapped supply to the high side floating gate driver in buck2. Connect a capacitor (recommend 47nF) from
9
BST2
BST2 pin to LX2 pin.
Switching node connection to the inductor and bootstrap capacitor for buck2. The voltage swing at this pin is from a
10
LX2
diode voltage below the ground up to PVIN2 voltage.
Power ground connection of buck2. Connect PGND2 pin as close as practical to the (–) terminal of VIN2 input
11
PGND2
ceramic capacitor.
Input power supply for buck2. Connect PVIN2 pin as close as practical to the (+) terminal of an input ceramic
12
PVIN2
capacitor (suggest 10µF).
Input power supply for buck3. Connect PVIN3 pin as close as practical to the (+) terminal of an input ceramic
13
PVIN3
capacitor (suggest 10µF).
Power ground connection of buck3. Connect PGND3 pin as close as practical to the (–) terminal of VIN3 input
14
PGND3
ceramic capacitor.
Switching node connection to the inductor and bootstrap capacitor for buck3. The voltage swing at this pin is from a
15
LX3
diode voltage below the ground up to PVIN3 voltage.
Copyright © 2013–2014, Texas Instruments Incorporated
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