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LTM4600HV
APPLICATIO S I FOR ATIO
should be placed directly adjacent the module input pins
in the PCB layout to minimize the trace inductance and
high frequency AC noise.
Output Capacitors
The LTM4600HV is designed for low output voltage ripple.
The bulk output capacitors C OUT is chosen with low enough
effective series resistance (ESR) to meet the output voltage
ripple and transient requirements. C OUT can be low ESR
tantalum capacitor, low ESR polymer capacitor or ceramic
capacitor (X5R or X7R). The typical capacitance is 200μF
Soft-Start and Latchoff with the RUN/SS pin
The RUN/SS pin provides a means to shut down the
LTM4600HV as well as a timer for soft-start and over-
current latchoff. Pulling the RUN/SS pin below 0.8V puts
the LTM4600HV into a low quiescent current shutdown
(I Q ≤ 75μA). Releasing the pin allows an internal 1.2μA
current source to charge up the timing capacitor C SS .
Inside LTM4600HV, there is an internal 1000pF capaci-
tor from RUN/SS pin to ground. If RUN/SS pin has an
external capacitor C SS_EXT to ground, the delay before
starting is about:
if all ceramic output capacitors are used. The internally
optimized loop compensation provides suf?cient stability
margin for all ceramic capacitors applications. Additional
t DELAY =
1 . 5 V
1 . 2 μ A
?( C SS _ EXT + 1000 pF )
output ?ltering may be required by the system designer,
if further reduction of output ripple or dynamic transient
spike is required. Refer to Table 2 for an output capaci-
tance matrix for each output voltage Droop, peak to peak
deviation and recovery time during a 5A/μs transient with
a speci?c output capacitance.
Fault Conditions: Current Limit and Over current
Foldback
The LTM4600HV has a current mode controller, which
inherently limits the cycle-by-cycle inductor current not
only in steady state operation, but also in transient.
To further limit current in the event of an over load condi-
tion, the LTM4600HV provides foldback current limiting.
If the output voltage falls by more than 50%, then the
maximum output current is progressively lowered to about
When the voltage on RUN/SS pin reaches 1.5V, the
LTM4600HV internal switches are operating with a clamp-
ing of the maximum output inductor current limited by the
RUN/SS pin total soft-start capacitance. As the RUN/SS pin
voltage rises to 3V, the soft-start clamping of the inductor
current is released.
V IN to V OUT Stepdown Ratios
There are restrictions in the maximum V IN to V OUT step
down ratio that can be achieved for a given input voltage.
These contraints are shown in the Typical Performance
Characteristics curves labeled “V IN to V OUT Stepdown
Ratio”. Note that additional thermal de-rating may apply.
See the Thermal Considerations and Output Current De-
Rating sections of this data sheet.
one sixth of its full current limit value.
4600hvfc
10
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