ltc3525esc6-5-trpbf Linear Technology Corporation, ltc3525esc6-5-trpbf Datasheet - Page 7

• Manufacturer Part Number: ltc3525esc6-5-trpbf
• Description: 400ma Micropower Synchronous Step-up Dc/dc Converter With Output Disconnect
• Manufacturer: Linear Technology Corporation

PI FU CTIO S
BLOCK DIAGRA
⎯ S ⎯ H ⎯ D ⎯ N (Pin 1): Logic Controlled Shutdown Input. Con-
nect to a voltage >1V to enable the LTC3525. Connect to
a voltage <0.4V to disable the LTC3525.
GND (Pins 2, 5): Ground.
V
V
+ 0.2V typical), it is powered from V
bypass capacitor from V
1µF is recommended.
IN
IN
U
until V
(Pin 3): Input Voltage. The LTC3525 is powered from
SHDN
OUT
U
1
exceeds V
SHUTDOWN
SHUTDOWN
V
THERMAL
OUT
V
UVLO
V
BEST
U
REF
SHUTDOWN
IN
IN
. Once V
W
STARTUP
to GND. A minimum value of
VB
SHUTDOWN
V
REF
TSD
UVLO
V
OUT
SEL
OUT
is greater than (V
GATE DRIVERS
CONDUCTION
ANTI-CROSS
. Place a ceramic
LOGIC
AND
GND
5
I
PK
I
VAL
WAKE
IN
SW
COMPARATOR
6
GND
INTEGRATOR
2
–
+
I
PK
ADJUST
OFFSET
V
Synchronous Rectifi er. Connect the output fi lter capacitor
from V
10µF ceramic is recommended. Use 22µF for reduced
output ripple. The output disconnect feature disconnects
V
SW (Pin 6): Switch Pin. Connect an inductor from this
pin to V
across SW and V
to zero to minimize EMI.
COMPARATOR
OUT
OUT
I
VALLEY
–
+
(Pin 4): Output Voltage Sense and the Output of the
from V
+
–
OUT
ADJUST
IN
LTC3525-3.3/LTC3525-5
COMPARATOR
. An internal antiringing resistor is connected
to GND, close to the IC. A minimum value of
SLEEP
IN
–
+
OFFSET
when ⎯ S ⎯ H ⎯ D ⎯ N is <0.4V.
IN
after the inductor current has dropped
FB
V
REF
+
–
ADJUST
SWITCH
WELL
V
3
IN
LTC3525-3/
3525 BD
4
V
OUT
3525fa
7