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| LTC3525L-3 Datasheet, PDF (6/12 Pages) Linear Technology – 400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect | |||
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LTC3525L-3
PI FU CTIO S
SHDN (Pin 1): Logic Controlled Shutdown Input. Connect
to a voltage >0.88V to enable the LTC3525L-3. Connect to
a voltage <0.3V to disable the LTC3525L-3.
GND (Pins 2, 5): Ground.
VIN (Pin 3): Input Voltage. The LTC3525L-3 is powered
from VIN until VOUT exceeds VIN. Once VOUT is greater
than (VIN + 0.2V typical), it is powered from VOUT. Place
a ceramic bypass capacitor from VIN to GND. A minimum
value of 1µF is recommended.
VOUT (Pin 4): Output Voltage Sense and the Output of the
Synchronous Rectiï¬er. Connect the output ï¬lter capacitor
from VOUT to GND, close to the IC. A minimum value of
10µF ceramic is recommended. Use 22µF for reduced
output ripple. The output disconnect feature disconnects
VOUT from VIN when SHDN is <0.3V.
SW (Pin 6): Switch Pin. Connect an inductor from this
pin to VIN. An internal antiringing resistor is connected
across SW and VIN after the inductor current has dropped
to zero to minimize EMI.
BLOCK DIAGRA
VIN
VOUT
VBEST
VSEL
VB
SW
6
VIN
3
WELL
SWITCH
SHDN
1
SHUTDOWN
SHUTDOWN GATE DRIVERS
AND
ANTI-CROSS
CONDUCTION
+
OFFSET â
VREF
UVLO
VREF
UVLO
ADJUST
IPK
+
STARTUP
SHUTDOWN
THERMAL
TSD
SHUTDOWN
LOGIC
IPK
COMPARATOR
OFFSET â
ADJUST
IVAL
IVALLEY
COMPARATOR
FB
WAKE
INTEGRATOR
VREF
SLEEP
COMPARATOR
ADJUST
5
GND
2
GND
VOUT
4
VOUT
3525 BD
3525lf
6
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