Datasheet
Q1
Z1/C1
R2
R3
To
Load
R
S
CARD EDGE
CONNECTOR
PLUG-IN CARD
V
IN
GND
OUT
PGD
PWR
TIMER
RETRY
SCL
SMBA
VREF
DIODE
VAUX
SENSE
GATE
VIN_K
UVLO/EN
OVLO
AGND
SDAI
FB
CL
VDD
ADR0
ADR1
ADR2
LM5066
VIN
GND
SDAO
MMBT3904
R1
LM5066
SNVS655G –JUNE 2011–REVISED FEBRUARY 2013
www.ti.com
- The AGND and GND connections should be connected at the pins of the device.The ground connections for
the various components around the LM5066 should be connected directly to each other, and to the LM5066’s
GND and AGND pin connection, and then connected to the system ground at one point. Do not connect the
various component grounds to each other through the high current ground line.
- Provide adequate thermal sinking for the series pass device (Q
1
) to help reduce stresses during turn-on and
turn-off.
- The board’s edge connector can be designed such that the LM5066 detects via the UVLO/EN pin that the
board is being removed, and responds by turning off the load before the supply voltage is disconnected. For
example, in Figure 17, the voltage at the UVLO/EN pin goes to ground before V
IN
is removed from the LM5066
as a result of the shorter edge connector pin. When the board is inserted into the edge connector, the system
voltage is applied to the LM5066’s VIN pin before the UVLO voltage is taken high, thereby allowing the LM5066
to turn on the output in a controlled fashion.
Figure 17. Recommended Board Connector Design
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Product Folder Links: LM5066