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LT3495B-1 Datasheet(PDF) 8 Page - Linear Technology

Part # LT3495B-1
Description  650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3495B-1 Datasheet(HTML) 8 Page - Linear Technology

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LT3495/LT3495B/
LT3495-1/LT3495B-1
8
3495b1b1fa
OPERATION
The LT3495 series utilizes a variable peak current, variable
off-time control scheme to provide high efficiency over a
wide range of output current.
The operation of the part can be better understood by
referring to the Block Diagram. The part senses the output
voltage by monitoring the voltage on the FB pin. The user
sets the desired output voltage by choosing the value of
the external top feedback resistor. The parts incorporate
a precision 76k bottom feedback resistor. Assuming that
output voltage adjustment is not used (CTRL pin is tied to
1.5Vorgreater),theinternalreference(VREF=1.235V)sets
the voltage at which FB will servo to during regulation.
The Switch Control block senses the output of the ampli-
fier and adjusts the switching frequency as well as other
parameters to achieve regulation. During the start-up of
the circuit, special precautions are taken to ensure that
the inductor current remains under control.
FortheLT3495/LT3495-1,theswitchingfrequencyisnever
allowedtofallbelowapproximately45kHz.Becauseofthis,
a minimum load must be present to prevent the output
voltage from drifting too high. For most applications, this
minimum load is automatically generated within the part
via the Shunt Control block. The level of this current is
adaptable, removing itself when not needed to improve
efficiency at higher load levels. However when the input
Table 1. Difference Between LT3495 and LT3495B/LT3495-1/LT3495B-1
PART
SWITCH CURRENT LIMIT (mA)
MINIMUM SWITCHING FREQUENCY (kHz) MINIMUM OUTPUT LOAD REQUIREMENT
LT3495
650
45
Required under certain conditions
LT3495B
650
0
Not Required
LT3495-1
350
45
Required under certain conditions
LT3495B-1
350
0
Not Required
voltage and output voltage are close, the internal shunt
current may not be large enough. Under this condition,
a minimum output load is required to prevent the output
voltage from drifting too high.
For the LT3495B/B-1, the minimum switching frequency
feature is disabled and the switching frequency can be as
low as zero. As a result, the output voltage will never drift
high and no minimum output load is required.
The LT3495 series also has a PMOS output disconnect
switch. The PMOS switch is turned on when the part is
enabledviatheSHDNpin.Whenthepartsareinshutdown,
the PMOS switch turns off, allowing the VOUTnodetogoto
ground. This type of disconnect function is often required
in power supplies.
The LT3495 series also sets a maximum switch on time of
10µs. This feature guarantees that the parts can continue
to deliver energy to the output even if the input supply
impedance becomes so large that the commanded peak
switch current is never reached.
ThedifferencebetweentheLT3495/LT3495BandLT3495-1/
LT3495B-1isthelevelofthecurrentlimit.LT3495/LT3495B
have a typical peak current limit of 650mA while the
LT3495-1/LT3495B-1 have a typical peak current limit of
350mA.ThedifferencesbetweentheLT3495andLT3495B/
LT3495-1/LT3495B-1 are listed in Table 1.


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