PG – Testpoint
Used to monitor the power-good flag. This flag indicates whether the output voltage has
reached its regulation point. This pin is an open-drain output that requires a pullup resistor
to the appropriate logic voltage (any voltage less than 20 V).
PG_PU – Testpoint
The top connection of an optional 100-kΩ pullup resistor that ties directly to the open-
drain PG pin. Supply an appropriate voltage to this test point, or tie it directly to the VOUT
test point to observe the PG flag operation if the output voltage is set less than 20 V.
SYNC – Testpoint
The input terminal for an optional external input clock to the converter as well a mode pin
for converter. If used, the external clock frequency must be between 200 kHz and 500
kHz.
2.2 Voltage Setup
Set the input voltage (V
IN
) range for the converter between the operating voltage range of 3.5 V to 60 V. If a load
is driven, it must be applied to the VOUT terminal and must not exceed the maximum load current of 5 A for
LM76005-Q1.
Note
Please remove R3 and tie BIAS pin to ground if output voltage is set higher than 24 V.
2.3 Operation
For proper operation of the LM76005-Q1, VIN, GND, and VOUT must be properly configured as stated above. In
this configuration, the device starts up when power is applied, and the output voltage of the regulator (V
OUT
)
comes up to the proper value. The default setting for output voltage of the LM76005-Q1 is 3.3 V. Other output
voltages can be set by replacing the feedback pin resistor dividers R7 and R8; consult the data sheet for proper
selection of these resistor values.
The default frequency for the LM76005QEVM is 400 kHz. If other frequencies are desired within the frequency
range of 200 kHz and 500 kHz, the R
T
resistor value can be changed. See the
Synchronous Step-Down Voltage Regulator Data Sheet
T
resistor. Change inductor
L2 and total output capacitance for proper control loop operation.
Setup
SNVU694A – FEBRUARY 2020 – REVISED JULY 2020
LM76005QEVM User’s Guide
3
Copyright © 2020 Texas Instruments Incorporated
