LTC3616 LINER [Linear Technology], LTC3616 Datasheet - Page 8

• Manufacturer Part Number: LTC3616
• Description: 6A, 4MHz Monolithic Synchronous Step-Down DC/DC Converter
• Manufacturer: LINER [Linear Technology]

PIN FUNCTIONS
LTC3616
TYPICAL PERFORMANCE CHARACTERISTICS
SRLIM/DDR (Pin 1): Slew Rate Limit. Tying this pin to
ground selects maximum slew rate. Minimum slew rate
is selected when the pin is open. Connecting a resistor
from SRLIM/DDR to ground allows the slew rate to be
continuously adjusted. If SRLIM/DDR is tied to S
mode is selected. In DDR mode the slew rate limit is set
to maximum.
RT/SYNC (Pin 2): Oscillator Frequency. This pin provides
three ways of setting the constant switching frequency:
1. Connecting a resistor from RT/SYNC to ground will set
2. Driving the RT/SYNC pin with an external clock signal
3. Tying the RT/SYNC pin to SV
8
the switching frequency based on the resistor value.
will synchronize the LTC3616 to the applied frequency.
The slope compensation is automatically adapted to the
external clock frequency.
2.25MHz oscillator frequency.
500mV/DIV
PGOOD
5V/DIV
5A/DIV
V
OUT
I
L
Start-Up from Shutdown with
Prebiased Output
(Forced Continuous Mode)
PREBIASED V
V
V
OUT
MODE
= 1.2V, I
= 1.5V
OUT
OUT
= 0A
= 2.2V
50μs/DIV
IN
enables the internal
3616 G31
VIN
, DDR
SGND (Pin 3): Signal Ground. All small-signal and compen-
sation components should connect to this ground, which
in turn should connect to PGND at a single point.
PV
nects to the source of the internal P-channel power MOSFET.
This pin is independent of SV
the same voltage or to a lower voltage supply.
SW (Pins 5, 6, 7, 8, 13, 14, 15, 16): Switch Node. Con-
nection to the inductor. These pins connect to the drains
of the internal synchronous power MOSFET switches.
NC (Pins 9, 12): Can be connected to ground or left
open.
SV
internal control circuitry and is monitored by the under-
voltage lockout comparator.
IN
IN
(Pins 4, 10, 11, 17): Power Input Supply. PV
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
(Pin 18): Signal Input Supply. This pin powers the
2.25
Output Voltage During Sinking
vs Input Voltage (V
0.47μH Inductor)
V
IN
2.75
= 3.3V, RT/SYNC = SV
INPUT VOLTAGE (V)
3.25
–3A, 2MHz, 120°C
–3A, 2MHz, 25°C
4
OUT
= 1.8V,
IN
4.5
and may be connected to
IN
unless otherwise noted.
5.25
3616 G32
IN
con-
3616f