L6722TR STMicroelectronics, L6722TR Datasheet - Page 22

IC BUCK ADJ 2A TRPL 36VFQFPN

L6722TR

Manufacturer Part Number
L6722TR
Description
IC BUCK ADJ 2A TRPL 36VFQFPN
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheet

Specifications of L6722TR

Internal Switch(s)
No
Synchronous Rectifier
No
Number Of Outputs
3
Voltage - Output
Adj to 0.8V
Current - Output
2A
Frequency - Switching
100kHz
Voltage - Input
12V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
36-VFQFN, 36-VFQFPN
Power - Output
3.5W
Operating Temperature Range
- 40 C to + 125 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-5904-2

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
L6722TR
Manufacturer:
STMicroelectronics
Quantity:
10 000
Part Number:
L6722TR
Manufacturer:
ST
0
9 Output voltage monitor and protections
9
9.1
9.2
9.3
22/34
Output voltage monitor and protections
L6722 monitors through pin VSEN the regulated voltage and compares this voltage with the
one present at the REF_IN pin to manage the OVP, UVP and PGOOD conditions. Protections
are active also during soft-start (See
Under voltage
If the output voltage monitored by VSEN drops more than -300mV below the programmed
reference for more than one clock period, the device turns off all mosfets and latches the
condition: to recover it is required to cycle Vcc or the INH pin.
UVP is active when the device is enabled, after the reference reaches 0.6V.
Over voltage
When the voltage sensed by VSEN overcomes the OVP threshold, the controller permanently
switches on all the low-side mosfets and switches off all the high-side mosfets in order to
protect the load. The FLT pin is driven high (5V) and power supply or INH pin cycling is required
to restart operations.
OVP is active as soon as the device is enabled.
Preliminary over voltage
To provide a protection while VCC is below the UVLO
disabled is fundamental to avoid damage to the load in case of failed HS mosfets. In fact, since
the device is supplied from the 12V bus, it is basically “blind” for any voltage below the turn-on
threshold (UVLO
is provided while VCC is within UVLO
This protection turns-on the low side mosfets as long as the FBR pin voltage is greater than
1.25V with a 300mV hysteresis. When set, the protection drives the LS mosfet with a gate-to-
source voltage depending on the voltage applied to VCC. This protection depends also on the
INH pin status as detailed in
A simple way to provide protection to the output in all conditions when the device is OFF (then
avoiding the unprotected red region in
through the 5VSB bus as shown in
in case of HS short, the LS mosfet is driven with 5V assuring a reliable protection of the load.
Pre-OVP is active when the device is disabled and when UVLO
VCC
). In order to give full protection to the load, a Preliminary-OVP protection
Figure
Figure
12.
Section 8
VCC
Figure
and UVLO
12-Right: 5VSB is always present before +12V and,
12-Left) consists in supplying the controller
for details).
OVP
VCC
.
threshold and when the device is
OVP
< VCC < UVLO
VCC
.
L6722

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