Datasheet

LT3509
7
3509fd
For more information www.linear.com/LT3509
block DiagraM
SHUTDOWN
AND
SOFT-START
CONTROL
OVERVOLTAGE
DETECT
COMMON
CIRCUITRY
1 OF 2 REGULATOR CHANNELS SHOWN
SWITCH
LOGIC
CLAMP
–17mV
18mΩ
GND
BD
V
REF
0.8V
SWITCH
DRIVER
ERROR
AMPLIFIER
DA CURRENT
COMPARATOR
L1
D1
R1
R2
MAIN CURRENT
COMPARATOR
POWER
SWITCH
BOOST
DIODE
BOOST
SW
DA
C5
FB
V
C
SLOPE
R
T
RT
SYNC
C3
C4
C1
RUN/SS2
RUN/SS1
V
IN
V
OUT
V
REF
AND
CORE
VOLTAGE
REGULATOR
OSCILLATOR
–
3509 BD
C2
NOTE: THE BD PIN
IS COMMON TO
BOTH CHANNELS
Figure 1. Functional Block Diagram
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