Datasheet

V
DD
, BYP, and POWERING OPTIONS
V
DD
A
C
GND
GATE
Input
Voltage
3.3V-18V
Common
Bus
CommonBusPowering
*OptionalFiltering
10*
V
DD
A
C
GND
GATE
Input
Voltage
0.8V-18V
Common
Bus
SeparateBusPowering
*OptionalFiltering
5V
2200pF
BYP
2200pF
BYP
0.01 Fm
0.01
Fm
10*
TPS2410
TPS2411
SLVS727C – NOVEMBER 2006 – REVISED JUNE 2009 .................................................................................................................................................. www.ti.com
The separate V
DD
pin provides flexibility for operational power and controlled rail voltage. While the internal
UVLO has been set to 2.5 V, the TPS2410/1 requires at least 3 V to generate the specified GATE drive voltage.
Sufficient BYP voltage to run internal circuits occurs at V
DD
voltages between 2.5 V and 3 V. There are three
choices for power, A, C, or a separate supply, two of which are demonstrated in Figure 16 . One choice for
voltage rails over 3.3 V is to power from C, since it is typically the source of reliable power. Voltage rails below
3.3 V, e.g. 2.5 V and below, should use a separate supply such as 5 V. A separate V
DD
supply can be used to
control voltages above it, for example 5 V powering V
DD
to control a 12-V bus.
V
DD
is the main source of power for the internal control circuits. The charge pump that powers BYP draws most
of its power from V
DD
. The input should be low impedance, making a bypass capacitor a preferred solution. A
10- Ω series resistor may be used to limit inrush current into the bypass capacitor, and to provide noise filtering
for the supply.
BYP is the interconnection point between a charge pump, V
(AC)
monitor amplifiers and comparators, and the gate
driver. C
(BYP)
must be used to filter the charge pump. A 2200 pF is recommended, but the value is not critical.
Figure 16. V
DD
Powering Examples
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