LTC3560_15 Datasheet, PDF (6/16 Pages) Linear Technology – 2.25MHz, 800mA Synchronous Step-Down Regulator in ThinSOT

LTC3560
TYPICAL PERFORMANCE CHARACTERISTICS
(From Figure 1a Except for the Resistive Divider Resistor Values)
Load Step
Load Step
Load Step
V_OUT
200mV/DIV
AC COUPLED
I_L
1A/DIV
I_LOAD
1A/DIV
V_IN = 3.6V
20μs/DIV
V_OUT = 1.8V
I_LOAD = 0A TO 800mA
Burst Mode OPERATION
3560 G22
V_OUT
200mV/DIV
AC COUPLED
I_L
1A/DIV
I_LOAD
1A/DIV
V_IN = 3.6V
20μs/DIV
V_OUT = 1.8V
I_LOAD = 50mA TO 800mA
Burst Mode OPERATION
3560 G23
V_OUT
200mV/DIV
AC COUPLED
I_L
1A/DIV
I_LOAD
1A/DIV
V_IN = 3.6V
20μs/DIV
V_OUT = 1.8V
I_LOAD = 100mA TO 800mA
Burst Mode OPERATION
3560 G24
PIN FUNCTIONS
RUN (Pin 1): Run Control Input. Forcing this pin above 1.5V
enables the part. Forcing this pin below 0.3V shuts down
the device. In shutdown, all functions are disabled drawing
<1μA supply current. Do not leave RUN floating.
GND (Pin 2): Ground Pin.
SW (Pin 3): Switch Node Connection to Inductor. This pin
connects to the drains of the internal main and synchronous
power MOSFET switches.
V_IN (Pin 4): Main Supply Pin. Must be closely decoupled
to GND, Pin 2, with a 10μF or greater ceramic capacitor.
V_FB (Pin 5): Feedback Pin. Receives the feedback voltage
from an external resistive divider across the output.
SYNC/MODE (Pin 6): External Clock Synchronization and
Mode Select Input. To synchronize with an external clock,
apply a clock with a frequency between 1MHz and 3MHz.
To select pulse-skipping mode, tie to V_IN. Grounding this
pin selects Burst Mode operation. Do not leave this pin
floating.
FUNCTIONAL DIAGRAM
SYNC/MODE
6
SLOPE
COMP
OSC
OSC
FREQ
SHIFT
V_FB
5
+
0.6V
– ^EA
V_IN
RUN
1
0.6V REF
SHUTDOWN
6
0.65V
– ^EN _SLEEP
0.4V
+
BURST
I_COMP
SQ
RQ
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
I_RCMP
4 VIN
5Ω
3 SW
2 GND
3560 BD
3560fb