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LTC3615 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC3615
Description  Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter
PDF  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3615 Datasheet(HTML) 13 Page - Linear Technology

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LTC3615

3615f
Burst Mode Operation—External Clamp
Connecting the MODE pin to a voltage in the range of 0.5V
to 0.8V enables Burst Mode operation with external clamp.
Duringthismodeofoperation,theminimumvoltageonthe
ITH pin is externally set by the voltage on the MODE pin.
It is recommended to use Burst Mode operation with the
internal clamp for ambient temperatures above 85°C.
Pulse-Skipping Mode Operation
Pulse-skipping mode is similar to Burst Mode operation,
but the LTC3615 does not disable power to the internal
circuitry during sleep mode. This improves output voltage
ripple but uses more quiescent current compromising
light load efficiency.
Connecting the MODE pin to SVIN enables pulse-skipping
mode. As the load current decreases, the peak inductor
current will be determined by the voltage on the ITH pin
until the ITH voltage drops below 450mV, corresponding
to 0A. At this point switching cycles will be skipped to
keep the output voltage in regulation.
Forced Continuous Mode Operation
In forced continuous mode the inductor current is con-
stantly cycled which creates a minimum output voltage
ripple at all output current levels.
Connecting the MODE pin, to a voltage in the range of
1.1V to SVIN • 0.58 will select the forced continuous mode
operation.
The forced continuous mode must be used if the output
is required to sink current.
Dropout Operation
Astheinputsupplyvoltageapproachestheoutputvoltage,
the duty cycle increases toward the maximum on-time.
Further reduction of the supply voltage forces the main
switch to remain on for more than one cycle, eventually
reaching 100% duty cycle. The output voltage will then be
determined by the input voltage minus the voltage drop
across the internal P-channel MOSFET and the inductor.
operaTion
Figure 2. Modes of Operation
LTC3615
SVIN
VIN
MODE
SW1
FB1
SGND
0V
VOUT1
RM1
RM2
LTC3615
SVIN
VIN
MODE
SGND
0V
LTC3615
SVIN
VIN
MODE
SGND
0V
RM1
RM2
3615 F02
LTC3615
SVIN
VIN
MODE
SGND
0V
2a. Burst Mode Operation
Internally Controlled
2b. Burst Mode Operation
Externally Controlled
2c. Pulse-Skipping Mode
2d. Forced Continuous Mode



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