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LTC1911EMS8-1.5 Datasheet(PDF) 8 Page - Linear Technology

Part # LTC1911EMS8-1.5
Description  Low Noise, High Efficiency, Inductorless Step-Down DC/DC Converter
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1911EMS8-1.5 Datasheet(HTML) 8 Page - Linear Technology

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8
LTC1911-1.5/LTC1911-1.8
sn1911 1911is
4.7nF capacitor on SS/SHDN results in a 3ms ramp time
from 0.6V to 1.9V on the pin. If COUT is 10µF, the 3ms VREF
ramp time results in an average COUT charge current of
only 6mA (see Figure 2).
Low Current Burst Mode Operation
To improve efficiency at low output currents, a Burst Mode
function was included in the design of the LTC1911. An
output current sense circuit is used to detect when the
required output current drops below 30mA typ. When this
occurs, the oscillator shuts down and the part goes into a
low current operating state. The LTC1911 will remain in
the low current operating state until VOUT has dropped
enough to require another burst of current. Unlike tradi-
tional charge pumps who’s burst current is dependant on
many factors (i.e., supply, switch strength, capacitor
selection, etc.), the LTC1911 burst current is set by the
burst threshold. This means that the
output ripple voltage
during Burst Mode operaton will be fixed and is typically
5mV.
Short-Circuit/Thermal Protection
The LTC1911 has built-in short-circuit current limiting as
well as overtemperature protection. During short-circuit
conditions it will automatically limit its output current to
approximately 600mA. The LTC1911 will shut down if the
junction temperature exceeds approximately 160
°C. Un-
der normal operating conditions, the LTC1911 should not
go into thermal shutdown but it is included to protect the
IC in cases of excessively high ambient temperatures, or
in cases of excessive power dissipation inside the IC (i.e.,
overcurrent or short circuit). The charge transfer will
reactivate once the junction temperature drops back to
approximately 150
°C. The LTC1911 can cycle in and out
of thermal shutdown indefinitely without latch-up or
damage until the fault condition is removed.
VOUT Ripple and Capacitor Selection
The type and value of capacitors used with the
LTC1911 determine several important parameters such
as regulator control loop stability, output ripple and
charge pump strength.
The value of COUT directly controls the amount of output
ripple for a given load current. Increasing the size of COUT
will reduce the output ripple.
APPLICATIO S I FOR ATIO
Figure 2. Shutdown/Soft-Start Operation
SS/SHDN
CSS
ON OFF VCTRL
6
8
VOUT
RLOAD
LTC1911
(2a)
VCTRL
2V/DIV
VOUT
1V/DIV
CSS = 0nF
2ms/DIV
1911 F02b
COUT = 10µF
RLOAD = 10Ω
(2b)
VCTRL
2V/DIV
VOUT
1V/DIV
CSS = 4.7nF
2ms/DIV
1911 F02c
COUT = 10µF
ROUT = 10Ω
(2c)


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