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TPS65261 Datasheet(PDF) 3 Page - Texas Instruments

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No. de Pieza. TPS65261
Descripción  2.7 to 6-V Input Voltage, 3-A/2-A/2-A Output Current Triple Synchronous Step-Down Converter
Descarga  36 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS65261 Datasheet(HTML) 3 Page - Texas Instruments

 
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Thermal
Pad
25
BST1
16
BST3
26
LX1
15
LX3
27
PGND1
14
PGND3
28
VIN1
13
VIN3
29
EN1
12
VIN2
30
EN2
11
PGND2
31
EN3
10
LX2
32
GND
9
BST2
3
TPS65266-1
www.ti.com
SLVSDA6 – OCTOBER 2016
Product Folder Links: TPS65266-1
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Copyright © 2016, Texas Instruments Incorporated
5 Pin Configuration and Functions
RHB PACKAGE
32-Pin (VQFN)
Top View
A.
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
1
AGND
Analog ground pin
2
AGND
Analog ground pin
3
AGND
Analog ground pin
4
PGOOD
An open-drain output; asserts low if output voltage of bucks beyond regulation range due to thermal shutdown, over-
current, under-voltage, or ENx low.
5
VINQ
Input voltage of converter controller and reference power supply bias. TI recommends to connect a 1-µF capacitor
from the pin to analog ground and put the capacitor as near as possible to this pin.
6
FB2
Feedback Kelvin sensing pin for buck2 output voltage. Connect this pin to buck2 feedback resistor divider.
7
COMP2
Error amplifier output and loop compensation pin for buck2. Connect a series resistor and capacitor to compensate
the control loop of buck converter 2 with peak current PWM mode.
8
SS2
Soft-start and tracking input for buck2 converter. An internal 5.5-µA pullup current source is connected to this pin.
The soft-start time of buck2 can be programmed by connecting a capacitor between this pin and ground.
9
BST2
Boot strapped supply to the high-side floating gate driver in buck2 converter. Connect a capacitor (47 nF
recommended) from BST2 pin to LX2 pin.
10
LX2
Switching node connection to the inductor and bootstrap capacitor for buck2 converter. The voltage swing at this pin
is from a diode voltage below the ground up to VIN2 voltage.
11
PGND2
Power ground connection of buck2. Connect PGND2 pin as close as practical to the (–) terminal of VIN2 input
ceramic capacitor.


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