LTC3772_15 Datasheet, PDF (7/20 Pages) Linear Technology – Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

W
FU CTIO AL DIAGRA
LTC3772
V_IN
UNDERVOLTAGE ^UV
LOCKOUT
1µA
I_TH/RUN
SHUTDOWN
– ^COMPARATOR
+
SHDN
VOLTAGE
REFERENCE
0.8V
SLEEP
– ^COMPARATOR
SLEEP
+
0.15V
0.225V
ERROR
AMPLIFIER
1.2V
SW
BURST
CLAMP
+
I_TH
BUFFER
–
75mV
+–
SLOPE
COMPENSATION
I_PRG
CURRENT
COMPARATOR
I_LIM
RS ^{R S}
LATCH Q
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
0V
OVERVOLTAGE
COMPARATOR
0.88V
550kHz
OSCILLATOR
V_IN
FREQUENCY
FOLDBACK
PGATE
SHORT-CIRCUIT
DETECT
+–
0.3V
V_FB
0.8V
SOFT-START
RAMP
GND
3772 FD
3772f
7