LTC3602_15 Datasheet, PDF (6/20 Pages) Linear Technology – 2.5A, 10V, Monolithic Synchronous Step-Down Regulator

LTC3602
PIN FUNCTIONS FE/UF Package
SYNC/MODE (Pin 1/Pin 4): Mode Select and External
Clock Synchronization Input.
PGOOD (Pin 2/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.
R_T (Pin 3/Pin 6): Frequency Set Pin.
I_TH (Pin 4/Pin 7): Error Amplifier Compensation Point.
V_FB (Pin 5/Pin 8): Feedback Pin.
SGND (Pin 17/Pin 9, Pin 21): Signal Ground.
RUN (Pin 6/Pin 10): Run Control Input. This pin may be
tied to PV_IN to enable the chip.
TRACK/SS (Pin 7/Pin 11): Tracking Input for the Controller
or Optional External Soft-Start Input. This pin allows the
start-up of V_OUT to “track” the external voltage at this pin
using an external resistor divider. An external soft-start can
be programmed by connecting a capacitor between this
pin and ground. Leave this pin floating to use the internal
1ms soft-start clamp. Do not tie this pin to INTV_CC or to
PV_IN.
PGND (Pins 8, 9, 10/Pins 12, 13, 14, 15): Power
Ground.
SW (Pins 11, 12, 13/Pins 16, 17, 18, 19): Switch Node
Connection to the Inductor.
BOOST (Pin 14/Pin 20): Bootstrapped Supply to the Top
Side Floating Gate Driver.
PV_IN (Pin 15/Pins 1,2): Power Input Supply. Decouple
this pin with a capacitor to PGND
INTV_CC (Pin 16/Pin 3): Output of Internal 5V LDO.
Exposed Pad (Pin 17/Pin 21): SGND. Exposed pad is
signal ground and must be soldered to the PCB.
BLOCK DIAGRAM
1μA
0.6V
VOLTAGE
REFERENCE
TRACK/SS
1ms
SOFT-START
I_TH
SLOPE
COMPENSATION
RECOVERY
BCLAMP
ERROR
+
AMPLIFIER
BURST
+
V_FB
+
–
+
COMPARATOR
MAIN
I-COMPARATOR
0.54V
SYNC/MODE
+–
+
–
–
OSILLATOR
SLOPE
COMPENSATION
OVER-CURRENT
+
COMPARATOR
0.66V _–
PGOOD
LOGIC
REVERSE
COMPARATOR
R_T
RUN SYNC/MODE
6
BOOST
INTV_CC
PV_IN
LDO
SW
SW
SW
PGND
PGND
PGND
3602 BD
3602fb