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TPS65251RHAR Datasheet(PDF) 4 Page - Texas Instruments

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No. de Pieza. TPS65251RHAR
Descripción  4.5-V TO 18-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE BUCK SWITCHER WITH INTEGRATED FET
Descarga  31 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS65251RHAR Datasheet(HTML) 4 Page - Texas Instruments

 
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TPS65251
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
www.ti.com
TERMINAL FUNCTIONS (DCA)
NAME
NO.
I/O
DESCRIPTION
RLIM3
1
I
Current limit setting for Buck 3. Fit a resistor from this pin to ground to set
the peak current limit on the output inductor.
SS3
2
I
Soft start pin for Buck 3. Fit a small ceramic capacitor to this pin to set the
converter soft start time.
COMP3
3
O
Compensation for Buck 3. Fit a series RC circuit to this pin to complete
the compensation circuit of this converter.
FB3
4
I
Feedback input for Buck 3. Connect a divider set to 0.8V from the output
of the converter to ground.
SYNC
5
I
Synchronous clock input. If there is a sync clock in the system, connect to
the pin. When not used connect to GND.
ROSC
6
I
Oscillator set. This resistor sets the frequency of internal autonomous
clock. If external synchronization is used resistor should be fitted and set
to ~70% of external clock frequency.
FB1
7
I
Feedback pin for Buck 1. Connect a divider set to 0.8 V from the output of
the converter to ground.
COMP1
8
O
Compensation pin for Buck 1. Fit a series RC circuit to this pin to
complete the compensation circuit of this converter.
SS1
9
I
Soft start pin for Buck 1. Fit a small ceramic capacitor to this pin to set the
converter soft start time.
RLIM1
10
I
Current limit setting pin for Buck 1. Fit a resistor from this pin to ground to
set the peak current limit on the output inductor.
EN1
11
I
Enable pin for Buck 1. A low level signal on this pin disables it. If pin is
left open a weak internal pull-up to V3V will allow for automatic enable.
For a delayed start-up add a small ceramic capacitor from this pin to
ground.
BST1
12
I
Bootstrap capacitor for Buck 1. Fit a 47-nF ceramic capacitor from this pin
to the switching node.
VIN1
13
I
Input supply for Buck 1. Fit a 10-µF ceramic capacitor close to this pin.
LX1
14, 15
O
Switching node for Buck 1
LX2
16, 17
O
Switching node for Buck 2
VIN2
18
I
Input supply for Buck 2. Fit a 10-µF ceramic capacitor close to this pin.
BST2
19
I
Bootstrap capacitor for Buck 2. Fit a 47-nF ceramic capacitor from this pin
to the switching node.
EN2
20
I
Enable pin for Buck 2. A low level signal on this pin disables it. If pin is
left open a weak internal pull-up to V3V will allow for automatic enable.
For a delayed start-up add a small ceramic capacitor from this pin to
ground.
RLIM2
21
I
Current limit setting for Buck 2. Fit a resistor from this pin to ground to set
the peak current limit on the output inductor.
SS2
22
I
Soft start pin for Buck 2. Fit a small ceramic capacitor to this pin to set the
converter soft start time.
COMP2
23
O
Compensation pin for Buck 2. Fit a series RC circuit to this pin to
complete the compensation circuit of this converter
FB2
24
I
Feedback input for Buck 2. Connect a divider set to 0.8 V from the output
of the converter to ground.
LOW_P
25
I
Low power operation mode(active high) input for TPS65251
GND
26
Ground pin
PGOOD
27
O
Power good. Open drain output asserted after all converters are
sequenced and within regulation. Polarity is factory selectable (active high
default).
V7V
28
O
Internal supply. Connect a 10-µF ceramic capacitor from this pin to
ground.
V3V
29
O
Internal supply. Connect a 10-µF ceramic capacitor from this pin to
ground.
AGND
30
Analog ground. Connect all GND pins and the power pad together.
GND
31
Ground pin
4
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Product Folder Link(s): TPS65251


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