PI3311-01-LGIZ Datasheet, PDF (19/26 Pages) Vicor Corporation – 8V to 36Vin, 15A Cool-Power ZVS Buck Regulator

Device
PI3311-X1-LGIZ
PI3318-X1-LGIZ
PI3312-X1-LGIZ
PI3301-X1-LGIZ
Output Voltage
Set
Range
1.0V
1.0 to 1.4V
1.8V
1.4 to 2.0V
2.5V
2.0 to 3.1V
3.3V
2.3 to 4.1V
Table 2 - PI33XX-X1 family output voltage ranges.
.
Output Current Limit Protection
PI33XX-X1 has two methods implemented to protect
from output short or over current condition.
Slow Current Limit protection: prevents the output
load from sourcing current higher than the
regulator’s maximum rated current. If the output
current exceeds the Current Limit (I_{OUT_CL}) for
1024us, a slow current limit fault is initiated and the
regulator is shutdown which eliminates output
current flow. After Fault Restart Delay (t_{FR_DLY}), a
soft-start cycle is initiated. This restart cycle will be
repeated indefinitely until the excessive load is
removed.
Fast Current Limit protection: PI33XX-X1 monitors
the regulator inductor current pulse-by-pulse to
prevent the output from supplying very high current
due to a sudden low impedance short. If the
regulator senses a high inductor current pulse, it will
initiate a fault and stop switching until Fault Restart
Delay ends and then initiate a soft-start cycle.
Both the Fast and Slow current limit faults are stored
in a Fault Register and can be read and cleared
(PI33XX-21 device versions only) via I²C data bus.
Input Under-Voltage Lockout
If VIN falls below the input Under Voltage Lockout
(UVLO) threshold, the regulator will enter a low
power state and initiate a fault. The system will
restart once the input voltage is reestablished and
after the Fault Restart Delay. A UVLO fault is stored
in a Fault Register and can be read and cleared
(PI33XX-21 device versions only) via I²C data bus.
vicorpower.com
800 735.6200
PI33XX-X1
Input Over Voltage Lockout
If VIN exceeds the input Over Voltage Lockout
(OVLO) threshold (V_OVLO), while the regulator is
running, the PI33XX-X1 will complete the current
cycle and stop switching. The system will resume
operation after the Fault Restart Delay. The OVLO
fault is stored in a Fault Register and can be read and
cleared (PI33XX-21 device versions only) via I²C data
bus.
Output Over Voltage Protection
The PI33XX-X1 family is equipped with output Over
Voltage Protection (OVP) to prevent damage to
input voltage sensitive devices. If the output voltage
exceeds 20% of its set regulated value, the regulator
will complete the current cycle, stop switching and
issue an OVP fault. The system will resume
operation once the output voltage falls below the
OVP threshold and after Fault Restart Delay. The
OVP fault is stored in a Fault Register and can be
read and cleared (PI33XX-21 device versions only) via
I²C data bus.
Over Temperature Protection
The internal package temperature is monitored to
prevent internal components from reaching their
thermal maximum. If the Over Temperature
Protection Threshold (OTP) is exceeded (T_OTP), the
regulator will complete the current switching cycle,
enter a low power mode, set a fault flag, and will
soft-start when the internal temperature falls below
Over-Temperature Restart Hysteresis (T_{OTP_HYS}). The
OTP fault is stored in a Fault Register and can be
read and cleared (PI33XX-21 device versions only) via
I²C data bus.
Pulse Skip Mode (PSM)
PI33XX-X1 features a PSM to achieve high efficiency
at light loads. The regulators are setup to skip pulses
if EAO falls below a PSM threshold. Depending on
conditions and component values, this may result in
single pulses or several consecutive pulses followed
by skipped pulses. Skipping cycles significantly
reduces gate drive power and improves light load
efficiency. The regulator will leave PSM once the
EAO rises above the Skip Mode threshold.
Rev 1.3
09/2015
Cool-Power^®
Page 19 of 26