Datasheet

5.2A
+
-
FB
COMP
CONTROL
LOGIC
EN
CURRENT LIMIT
OVERVOLTAGE
UNDERVOLTAGE
ERROR AMP
PWM COMPARATOR
SS/TRK
PGOOD
+
-
+5.5V
REGULATOR
VCC
BOOT
VCC
THERMAL
PROTECTION
GND
SW
VIN
CURRENT SENSE
VCC
1.25V
BOOT
BOOT
UVLO
4.25V
AGND
+
740 mV
880 mV
PG-L
PG-L
2.7V
g
m
= 515 Pmho
VREF
+
-
800 mV
+
-
+
VCC
2 PA
DISCHARGE
DISCHARGE
SLOPE COMP
4.5 PA
+
-
-2.8A
NEGATIVE
CURRENT LIMIT
+2.7V
REGULATOR
2.7V
+
-
+
-
+
-
+
-
RT
OSCILLATOR
LM20343
www.ti.com SNVS559B –MAY 2008–REVISED APRIL 2013
Block Diagram
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