LTC3100
16
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For more information www.linear.com/LTC3100
LDO REGULATOR OPERATION
The LDO regulator utilizes an internal 1.3?(typical)
P-channel MOSFET pass device to supply up to 100mA
of load current with a typical dropout voltage of 130mV.
The input voltage to the LDO is internally connected to
the boost output (V
BST
pin), and can share the same filter
capacitor. The LDO can be operated independently of the
boost (or buck) converter, providing a sufficient voltage
is present on V
BST
.
Soft-Start and Current Limit
The LDO has an independent current limit circuit that limits
output current to 120mA (typical). To minimize loading on
the boost converter output when enabling the LDO, the LDO
current limit is soft-started over a 500祍 period. Therefore
the rise time of the LDO output voltage will depend on the
amount of capacitance on the V
LDO
pin.
Reverse Current Blocking
The LDO is designed to prevent any reverse current from
V
LDO
back to the V
BST
pin, both in normal operation and
in shutdown. If V
LDO
is pulled above V
BST
and V
BST
is
above 1V, there will be a small (1礎 typical) current from
V
LDO
to ground.
COMMON FUNCTIONS
Oscillator
The 1.5MHz oscillator is shared by the boost and buck
converters. It will be oscillating if either converter is en-
abled. If both converters are enabled, the boost N-channel
MOSFET switch will be turned on coincident with the buck
P-channel MOSFET switch.
MODE Control
The MODE pin is used to force fixed frequency opera-
tion (MODE < 0.3V) or to enable Burst Mode operation
(MODE > 0.9V) for both the boost and buck converters.
With Burst Mode operation enabled, the two converters
will automatically enter or leave Burst Mode operation
independently, based on their respective load conditions.
There is an internal 1M?pull-up on MODE, in the event
that the pin is left open.
Note: Leaving the pin open, or connecting it to the high-
est of V
INBK
or V
BST
, will result in the lowest Burst Mode
quiescent current.
Overtemperature Shutdown
If the die temperature exceeds 150癈 (typical) both con-
verters and the LDO regulator will be disabled. All power
devices will be turned off and all switch nodes will be high
impedance. The soft-start circuits for both converters
and the LDO are reset during overtemperature shutdown
to provide a smooth recovery once the overtemperature
condition is eliminated. Both converters and the LDO will
restart (if enabled) when the die temperature drops to
approximately 130癈.
OPERATION
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