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TPS65287RHA Datasheet(PDF) 6 Page - Texas Instruments

No. de pieza TPS65287RHA
Descripción Electrónicos  4.5-V to 18-V Input, High Current, Synchronous Step Down Three DC-DC Converter
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65287RHA Datasheet(HTML) 6 Page - Texas Instruments

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TPS65287
SLVSBX2 – MAY 2013
www.ti.com
TERMINAL FUNCTIONS
NAME
NO.
I/O
DESCRIPTION
Current limit setting for Buck3. Fit a resistor from this pin to ground to set
RLIM3
1
I
the peak current limit on the output inductor.
Soft start pin for Buck3. Fit a small ceramic capacitor to this pin to set the
SS3
2
I
converter soft start time.
Compensation for Buck3. Fit a series RC circuit to this pin to complete
COMP3
3
O
the compensation circuit of this converter.
Feedback pin for Buck3. Connect a divider set to 0.8 V from the output of
FB3
4
I
the converter to ground.
PB_IN
5
I
Push button input (active low)
Oscillator set. This resistor sets the frequency of internal autonomous
ROSC
6
I
clock.
Feedback pin for Buck1. Connect a divider set to 0.8 V from the output of
FB1
7
I
the converter to ground.
Compensation pin for Buck1. Fit a series RC circuit to this pin to complete
COMP1
8
O
the compensation circuit of this converter.
Soft-start pin for Buck1. Fit a small ceramic capacitor to this pin to set the
SS1
9
I
converter soft-start time.
Current limit setting pin for Buck1. Fit a resistor from this pin to ground to
RLIM1
10
I
set the peak current limit on the output inductor.
Enable pin for Buck1. A high signal on this pin enables the regulator
EN1
11
I
Buck. For a delayed start-up add a small ceramic capacitor from this pin
to ground.
Bootstrap capacitor for Buck1. Fit a 47-nF ceramic capacitor from this pin
BST1
12
to the switching node.
VIN1
13
I
Input supply for Buck1. Fit a 10-µF ceramic capacitor close to this pin.
LX1
14, 15
O
Switching node for Buck1
LX2
16, 17
O
Switching node for Buck2
VIN2
18
I
Input supply for Buck2. Fit a 10-µF ceramic capacitor close to this pin.
Bootstrap capacitor for Buck2. Fit a 47-nF ceramic capacitor from this pin
BST2
19
to the switching node.
Enable pin for Buck2. A high signal on this pin enables the regulator. For
EN2
20
I
a delayed start-up add a small ceramic capacitor from this pin to ground.
Current limit setting pin for Buck2. Fit a resistor from this pin to ground to
RLIM2
21
I
set the peak current limit on the output inductor.
Soft-start pin for Buck2. Fit a small ceramic capacitor to this pin to set the
SS2
22
I
converter soft-start time.
Compensation pin for Buck2. Fit a series RC circuit to this pin to complete
COMP2
23
O
the compensation circuit of this converter.
Feedback input for Buck2. Connect a divider set to 0.8 V from the output
FB2
24
I
of the converter to ground.
Forces PWM operation in all converters when set high. If low converters
F_PWM
25
I
will operate in automatic PFM/PWM mode.
INT
26
O
Open drain interrupt output
Power good. Open drain output asserted low after all converters and
PGOOD
27
O
sequenced and within regulation. Polarity is factory selectable (active high
default).
Internal supply. Connect a 4.7-
μF to 10-μF ceramic capacitor from this pin
V7V
28
O
to ground.
Internal supply. Connect a 3.3-
μF to 10-μF ceramic capacitor from this pin
V3V
29
O
to ground.
Set USB current limit by an external resistor to ground. Connect this pin
RSET
30
I
to ground to set USB current limit to default 1.2 A.
IC
31
I
This pin should be connected to V7V pin
USB_VIN
32
I
USB switch Input supply
USB_VO
33
O
USB switch output
6
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Product Folder Links: TPS65287


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