Datasheet

LTM4620A
9
4620afb
For more information www.linear.com/LTM4620A
PIN FUNCTIONS
RUN1, RUN2 (F5, F9): Run Control Pin. A voltage above
1.25V will turn on each channel in the module. A voltage
below 1.25V on the RUN pin will turn off the related chan
-
nel. Each RUN pin has a 1µA pull-up current, once the
RUN pin reaches 1.2V an additional 4.5µA pull-up current
is added to this pin.
DIFFOUT (F8): Internal Remote Sense Amplifier Output.
Connect this pin to V
OUTS1
or V
OUTS2
depending on which
output is using remote sense. In parallel operation con-
nect one
of the V
OUTS
pin to DIFFOUT for remote sensing.
Diffamp can be used for ≤3.3V outputs.
SW1, SW2 (G2, G11): Switching node of each channel
that is used for testing purposes. Also an R-C snubber
network can be applied to reduce or eliminate switch node
ringing, or otherwise leave floating. See the Applications
Information section.
PHASMD (G4): Connect this pin to SGND, INTV
CC
, or float-
ing this pin to select the phase of CLKOUT to 60 degrees,
120 degrees, and 90 degrees respectively.
CLKOUT
(G5): Clock output with phase control using the
PHASMD pin to enable multiphase operation between
devices. See the Applications Information section.
PGOOD1,
PGOOD2 (G9, G8): Output
Voltage Power
Good Indicator. Open drain logic output that is pulled to
ground when the output voltage is not within ±7.5% of
the regulation point.
INTV
CC
(H8): Internal 5V Regulator Output. The control
circuits and internal gate drivers are powered from this
voltage. Decouple this pin to PGND with a 4.7µF low ESR
tantalum or ceramic. INTV
CC
is activated when either RUN1
or RUN2 is activated.
TEMP (J6): Onboard Temperature Diode for Monitoring
the VBE Junction Voltage Change with Temperature. See
the Applications Information section.
EXTV
CC
(J7): External power input that is enabled through
a switch to INTV
CC
whenever EXTV
CC
is greater than 4.7V.
Do not exceed 6V on this input, and connect this pin to
V
IN
when operating V
IN
on 5V. An efficiency increase will
occur that is a function of the (V
IN
– INTV
CC
) multiplied
by power MOSFET driver current. Typical current require-
ment is
30
mA. V
IN
must be applied before EXTV
CC
, and
EXTV
CC
must be removed before V
IN
. A 5V output can be
tied to this pin to increase efficiency. See Applications
Information section.
V
IN
(M2-M11, L2-L11, J2-J4, J9-J11, K2-K4, K9-K11):
Power Input Pins. Apply input voltage between these pins
and GND pins. Recommend placing input decoupling
capacitance directly between V
IN
pins and GND pins.
(Recommended to Use Test Points to Monitor Signal Pin Connections.)