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LTM4609
APPLICATIONS INFORMATION
I OUT(MAX,BUCK) =
130mV ?I L
V_UVLO=
? 1.6V
R SENSE(MAX,BUCK) =
t SOFTSTART =
In buck mode, the allowed maximum average load cur-
rent is:
+
R SENSE 2
The maximum current sensing R SENSE value for the boost
mode is:
R SENSE(MAX,BOOST) =
2 ? 160mV ? V IN
2 ? I OUT(MAX,BOOST) ? V OUT + ?I L ? V IN
The maximum current sensing R SENSE value for the buck
mode is:
2 ? 130mV
2 ? I OUT(MAX,BUCK) – ?I L
A 20% to 30% margin on the calculated sensing resistor
is usually recommended. Please refer to Table 3 for the
recommended sensing resistors for different applications.
Soft-Start
The SS pin provides a means to soft-start the regulator.
A capacitor on this pin will program the ramp rate of the
output voltage. A 1.7μA current source will charge up the
external soft-start capacitor. This will control the ramp of
the internal reference and the output voltage. The total
soft-start time can be calculated as:
2.4V ? C SS
1.7μA
When the RUN pin falls below 1.6V, then the soft-start
pin is reset to allow for proper soft-start control when
the regulator is enabled again. Current foldback and force
continuous mode are disabled during the soft-start process.
Do not apply more than 6V to the SS pin.
Run Enable
The RUN pin is used to enable the power module. The pin
can be driven with a logic input, not to exceed 6V.
The RUN pin can also be used as an undervoltage lockout
(UVLO) function by connecting a resistor from the input
supply to the RUN pin. The equation:
R1+R2
R2
Power Good
The PGOOD pin is an open drain pin that can be used to
monitor valid output voltage regulation. This pin monitors
a ±7.5% window around the regulation point.
COMP Pin
This pin is the external compensation pin. The module
has already been internally compensated for most output
voltages. A spice model is available for other control loop
optimization.
Fault Conditions: Current Limit and Overcurrent
Foldback
LTM4609 has a current mode controller, which inherently
limits the cycle-by-cycle inductor current not only in steady
state operation, but also in transient. Refer to Table 3.
To further limit current in the event of an overload condi-
tion, the LTM4609 provides foldback current limiting. If the
output voltage falls by more than 70%, then the maximum
output current is progressively lowered to about 30% of
its full current limit value for boost mode and about 40%
for buck mode.
Standby Mode (STBYMD)
The standby mode (STBYMD) pin provides several choices
for start-up and standby operational modes. If the pin is
pulled to ground, the SS pin is internally pulled to ground,
preventing start-up and thereby providing a single control
4609ff
12
For more information www.linear.com/LTM4609
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