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LTC3246 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 11 Page - Analog Devices

๋ถ€ํ’ˆ๋ช… LTC3246
์ƒ์„ธ๋‚ด์šฉ  Wide VIN Range Buck-Boost Charge Pump with Watchdog Timer
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LTC3246 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 11 Page - Analog Devices

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LTC3246
11
3246fa
For more information www.linear.com/LTC3246
Short-Circuit/Thermal Protection
The LTC3246 has built-in short-circuit current limiting
on both the VOUT and BIAS outputs to protect the part in
the event of a short. During short-circuit conditions, the
device will automatically limit the output current from
both outputs.
The LTC3246 has thermal protection that will shut
down the device if the junction temperature exceeds the
overtemperature threshold (typically 175ยฐC). Thermal
shutdown is included to protect the IC in cases of exces-
sively high ambient temperatures, or in cases of excessive
power dissipation inside the IC. The charge transfer will
reactivate once the junction temperature drops back to
approximately 165ยฐC.
Whenthethermalprotectionisactive,thejunctiontempera-
ture is beyond the specified operating range. The thermal
and short-circuit protection are intended for momentary
overload conditions outside normal operation. Continu-
ous operation above the specified maximum operating
conditions may impair device reliability.
Programming the Output Voltage (OUTS/ADJ Pin)
The LTC3246 output voltage programming is very flexible
offering a fixed 3.3V output, fixed 5V output as well as
adjustable output that is programmed through an external
resistor divider. The desired output regulation method is
selected through the SEL pins.
For a fixed output simply short OUTS (OUTS/ADJ pin) to
VOUT as shown in Figure 1. Fixed 3.3V operation is enabled
by driving both SEL1 and SEL2 pins high, while fixed 5V
operating is selected by driving SEL2 high with SEL1 low.
Driving both SEL1 and SEL2 low shuts down the device
causing VOUT to be pulled low by an internal impedance
of about 80k.
LTC3246
COUT
3246 F01
VOUT
FIXED 3.3V OR
FIXED 5.0V
VOUT
OUTS/ADJ
GND
Figure1. Fixed Output Operation
APPLICATIONS INFORMATION
Adjustable output programming is accomplished by con-
necting ADJ (OUTS/ADJ pin) to a resistor divider between
VOUT and GND as shown in Figure 2. Adjustable operation
isenabledbydrivingSEL1highandSEL2low.Drivingboth
SEL1 and SEL2 low shuts down the device, causing VOUT
to be pulled low by an internal impedance of about 80k.
LTC3246
COUT
3246 F02
VOUT
1.1V 1
RA
RB
RA
RB
VOUT
OUTS/ADJ
GND
Figure2. Adjustable Output Operation
Using adjustable operation, the output (VOUT) can be
programmed to regulate from 2.5V to 5V. The limited
programming range provides the required VOUT operating
voltage without overstressing the VOUT pin.
The desired adjustable output voltage is programmed by
solving the following equation for RA and RB:
RA
RB
=
VOUT
1.11V
โ€“ 1
Select a value for RB in the range of 1k to 1M and solve
for RA. Note that the resistor divider current adds to the
total no load operating current. Thus, a larger value for
RB will result in lower operating current.
2:1 Step-Down Charge Pump Operation
When the input supply is greater than about two times
the output voltage, the LTC3246 will operate in 2:1 step-
down mode. Charge transfer happens in two phases. On
the first phase, the flying capacitor (CFLY) is connected
between VIN and VOUT. On this phase, CFLY is charged up
and current is delivered to VOUT. On the second phase,
the flying capacitor (CFLY) is connected between VOUT and
GND. The charge stored on CFLY during the first phase is
transferred to VOUT on the second phase. When in 2:1
step-down mode, the input current will be approximately


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