Datasheet

LDO1
LDO2
OUT1
OUT1-S
OUT2
OUT2-S
10 Fm
V
DDIO-n
V
DD-n
V
DDIO-3
V
DD-3
V
DDIO-2
V
DD-2
V
DDIO-1
V
DD-1
0.1 Fm
0.1 Fm
0.1 Fm0.1 Fm 0.1 Fm
0.1 Fm
0.1 Fm
0.1 Fm
C2000
Controller
10 Fm
TPS75005
SBVS144C –NOVEMBER 2011–REVISED APRIL 2012 www.ti.com
LDO BLOCKS
The TPS75005 integrates two high-bandwidth LDOs for powering the V
DD
and V
DDIO
pins of the C2000
controllers.
Input Capacitor
Although an input capacitor is not required for LDO stability, it is recommended to connect a 10-μF capacitor
across the input supply near the device. In addition to input capacitor consideration, pay attention to the printed
circuit board (PCB) design in order to reduce source impedance.
X5R- and X7R-type capacitors are highly recommended because they have minimal variation in value and ESR
over temperature. Maximum ESR should be less than 1.0 Ω.
Output Capacitors
The TPS75005 is designed to be stable using standard ceramic capacitors with capacitance values 4.7 μF or
greater. In order to meet C2000 transient requirements, a 10-µF output capacitor at each of OUT1 and OUT2 is
recommended.
X5R- and X7R-type capacitors are highly recommended because they have minimal variation in value and ESR
over temperature. Maximum ESR should be less than 1.0 Ω.
See the Sense Pins (OUT1_S AND OUT2_S) section for more details.
Sense Pins (OUT1_S AND OUT2_S)
The TPS75005 has output voltage sensing pins OUT1_S and OUT2_S. OUT1_S should be connected to OUT1
at the output capacitor of LDO1, and OUT2_S to OUT2 at the output capacitor of LDO2. Both output capacitors
should be placed close to the device to minimize OUT1_S and OUT2_S trace. Figure 27 shows capacitor
placement.
Figure 27. Output Capacitors Placement and Sense Pins
When the C2000 controller is placed far from the TPS75005 on a PCB, it is recommended to connect the output
capacitors of OUT1 and OUT2 as close as possible to the TPS75005 device in order to route OUT1 and OUT2
node to a C2000 controller, and to place 0.1-µF ceramic capacitors for each of the V
DD
and V
DDIO
pins.
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Product Folder Link(s): TPS75005