LTC3615 LINER [Linear Technology], LTC3615 Datasheet - Page 23

• Manufacturer Part Number: LTC3615
• Description: Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter
• Manufacturer: LINER [Linear Technology]

applicaTions inForMaTion
External Reference Input (DDR Mode)
If SRLIM is tied to SV
as an external reference input between 0.3V and 0.5V, if
desired (see Figure 13).
PIN VOLTAGE
PIN VOLTAGE
IN
TRACK/SS
TRACK/SS
VOLTAGE
VOLTAGE
VOLTAGE
SV
VOLTAGE
VOLTAGE
SV
VOLTAGE
, the TRACK/SS pin can be used
RUN PIN
RUN PIN
V
V
FB
FB
IN
IN
PIN
PIN
PIN
PIN
SHUTDOWN
SHUTDOWN
0.45V
0.45V
STATE
STATE
0.6V
0.6V
0.1V
0.3V
0.3V
0.1V
V
V
V
V
0V
0V
0V
0V
0V
0V
0V
0V
IN
IN
IN
IN
SOFT-START
SOFT-START
t
t
SS
SS
STATE
STATE
Figure 14. Tracking if V
> 1ms
> 1ms
Figure 13. Tracking if V
REFERENCE 0.45V
RUN STATE
RUN STATE
EXTERNAL
VOLTAGE
SRLIM
In DDR mode, the maximum slew rate is selected. If
V
is enabled. If V
rent foldback is disabled and the PGOOD pin is always
pulled down.
TRACK/SS
SRLIM
DOWN-
TRACKING
STATE
DOWN-
TRACKING
STATE
Is Tied to SV
FREQUENCY
SWITCHING
Is Low
FREQUENCY
REDUCED
SWITCHING
REDUCED
is within 0.3V and 0.5V, the PGOOD function
TRACKING
TRACKING
TRACK/SS
IN
STATE
STATE
UP-
UP-
RUN STATE
RUN STATE
TIME
TIME
is less than 0.3V, the output cur-
3615 F13
3615 F14
LTC3615

3615f