LTC3603 Linear Dimensions Semiconductor, LTC3603 Datasheet - Page 6

• Manufacturer Part Number: LTC3603
• Description: Monolithic Synchronous Step-Down Regulator
• Manufacturer: Linear Dimensions Semiconductor

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PIN FUNCTIONS
BLOCK DIAGRAM
LTC3603
INTV
SYNC/MODE (Pin 2/Pin 4): Mode Select and External
Clock Synchronization Input.
PGOOD (Pin 3/Pin 5): Power Good Output. Open-drain
logic output that is pulled to ground when the output volt-
age is not within ±10% of regulation point.
RT (Pin 4/Pin 6): Frequency Set Pin.
ITH (Pin 5/Pin 7): Error Amplifi er Compensation Point.
V
SGND (Pin 7/Pin 9): Signal Ground.
RUN (Pin 8/Pin 10): Run Control Input. This pin may be
tied to PV
TRACK/SS (Pin 9/Pin 11): Tracking Input for the Controller
or Optional External Soft-Start Input. This pin allows the
start-up of V
6
FB
(Pin 6/Pin 8): Feedback Pin.
CC
(Pin 1/Pin 3): Output of Internal 5V LDO.
IN
to enable the chip.
OUT
to “track” the external voltage at this pin
TRACK/SS
V
PGOOD
FB
0.54V
0.66V
1μA
0.6V
MSE/UF Package
+
+
+
–
+
–
+
–
SOFT-START
REFERENCE
VOLTAGE
SYNC/MODE
1ms
AMPLIFIER
ERROR
+
–
OSILLATOR
ITH
+
–
RT
COMPARATOR
BURST
BCLAMP
COMPENSATION
RUN
RECOVERY
SLOPE
LOGIC
using an external resistor divider. An external soft-start can
be programmed by connecting a capacitor between this
pin and ground. Leave this pin fl oating to use the internal
1ms soft-start clamp. Do not tie this pin to INTV
PV
PGND (Pins 10, 11/Pins 12, 13, 14, 15): Power
Ground.
SW (Pins 12, 13/Pins 16, 17, 18, 19): Switch Node Con-
nection to the Inductor.
BOOST (Pin 14/Pin 20): Bootstrapped Supply to the Top
Side Floating Gate Driver.
PV
this pin with a capacitor to PGND
Exposed Pad (Pin 17/Pin 21): SGND. Exposed Pad is
signal ground and must be soldered to the PCB.
SYNC/MODE
I-COMPARATOR
IN
IN
OVER-CURRENT
.
COMPARATOR
COMPARATOR
(Pins 15, 16/Pins 1,2): Power Input Supply. Decouple
MAIN
REVERSE
COMPENSATION
SLOPE
+
–
+
–
+
–
BOOST
INTV
CC
PGND
PGND
PGND
SW
SW
SW
PV
3602 BD
IN
CC
or to
3603f