L6722TR STMicroelectronics, L6722TR Datasheet - Page 31

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

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

L6722
Caution:
Remote Sense Connection must be routed as parallel nets from the FBG/FBR pins to the load
in order to avoid the pick-up of any common mode noise. Connecting these pins in points far
from the load will cause a non-optimum load regulation, increasing output tolerance.
Locate current reading components close to the device. It's also important to minimize any
offset in the measurement and, to get a better precision, to connect the traces as close as
possible to the sensing elements.
Boot capacitor extra charge. Systems that do not use Schottky diodes in parallel to the low-
side mosfet might show big negative spikes on the phase pin. This spike can be limited as well
as the positive spike but has an additional consequence: it causes the bootstrap capacitor to be
over-charged. This extra-charge can cause, in the worst case condition of maximum input
voltage and during particular transients, that boot-to-phase voltage overcomes the abs. max.
ratings also causing device failures. It is then suggested in this cases to limit this extra-charge
by:
Figure 18. Power connections and related connections layout (same for all phases).
UGATEx
PHASEx
LGATEx
PGNDx
–
–
adding a small resistor in series to the boot diode (one resistor can be enough for all
the three diodes if placed upstream the boot diode anode, see
using non-capacitive boot diodes (such as standard diodes).
V
C
IN
IN
L
LOAD
PHASEx
BOOTx
SGND
VCC
To limit C
BOOT
Extra-Charge
+Vcc
Figure
V
C
IN
IN
12 Layout guidelines
L
18)
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