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Table 1
Test Point Descriptions
Test Points
Reference Designator/
Functional Name
Description
VIN_F
Input voltage test point close to VIN of the PI3740.
+VOUT SENSE1
–VOUT SENSE 1
Output voltage test points.
VDR
A 5.1V auxiliary supply with max loading of 2mA. If used this pin must have a se-
ries resistance such as R103 = 1k
Ω
with a decoupling cap of 0.1µF such as C124.
PGD
Power good indicator. During a regulator fault this pin is pulled internally to signal
ground.
EN
Input to the regulator. If left floating or driven high (VEN_MAX = 5.5V) regulator
will be enabled.
SGND
Internal logic ground.
TRK
Soft-start and track input. An external capacitor may be connected between TRK
pin and SGND to increase the rise time of the internal reference during soft-start.
IMON
Output of the internal current sense amplifier.
EAO
Error Amp output. External connection for additional compensation and current
sharing.
EXT_REF
Error Amp Inverting Input separated with REA3 = 10k
Ω
.
VSP
Non-inverting input to an independent amplifier.
VSN
Inverting input to an independent amplifier.
VDIFF
Output of the internal independent amplifier.
LGH
Input for constant current amplifier.
SYNCO
Synchronization Output.
SYNCI
Synchronization Input.