Datasheet

TPS65250
www.ti.com SLVSAA3C –JUNE 2010–REVISED OCTOBER 2012
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 there is no synchronous clock, the operating frequency of the
regulators is set to the 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 TPS65250
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.
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Product Folder Links: TPS65250