L6728ATR STMicroelectronics, L6728ATR Datasheet - Page 5

• Manufacturer Part Number: L6728ATR
• Description: IC CTLR PWM SGL HI FREQ 10VFQFPN
• Manufacturer: STMicroelectronics

Specifications of L6728ATR

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 660kHz
• Duty Cycle: 67%
• Voltage - Supply: 5 V ~ 12 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 10-DFN
• Frequency-max: 660kHz
• Topology: Buck
• Output Voltage: 0.8 V
• Output Current: 1500 mA
• Switching Frequency: 660 KHz
• Duty Cycle (max): 67 %
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Synchronous Pin: No
• For Use With: 497-8228 - BOARD EVALUATION W/L6728497-6418 - BOARD EVAL BASED ON L6728
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8324-2

L6728A
2
2.1
Pins description and connection diagrams
Figure 3.
Pin descriptions
Table 2.
Pin #
1
2
3
4
5
6
7
8
LGATE / OC
COMP / DIS
PHASE
UGATE
Pins connection (top view)
Pin description
Name
BOOT
GND
VCC
FB
LGATE / OC
HS driver supply.
Connect through a capacitor (100 nF) to the floating node (LS-Drain) pin
and provide necessary bootstrap diode from V
HS driver return path, current-reading and adaptive-dead-time monitor.
Connect to the LS drain to sense R
current. This pin is also used by the adaptive-dead-time control circuitry to
monitor when HS MOSFET is OFF.
HS driver output. Connect directly to HS MOSFET gate.
LGATE. LS driver output. Connect directly to LS MOSFET gate.
OC over-current threshold set. During a short period of time following V
rising over UVLO threshold, a 10 μA current is sourced from this pin.
Connect to GND with an R
Threshold. The resulting voltage at this pin is sampled and held internally
as the OC set point. Maximum programmable OC threshold is 0.55 V. A
voltage greater than 0.6 V activates an internal clamp and causes OC
threshold to be set at the maximum value.
All internal references, logic and drivers are connected to this pin.
Connect to the PCB ground plane.
Device and Drivers power supply.
Operative range from 5 V to 12 V. Filter with at least 1 μF MLCC to GND.
COMP. Error amplifier output. Connect with an R
compensate the device control loop.
DIS. The device can be disabled by pushing this pin lower than 0.75 V (typ).
Setting free the pin, the device enables again.
Error amplifier inverting input.
Connect with a resistor R
divider may be used to regulate voltages higher than the reference.
PHASE
UGATE
BOOT
GND
1
2
3
4
5
L6728A
FB
Pins description and connection diagrams
OCSET
to the output regulated voltage. Output resistor
10
9
8
7
6
Function
resistor greater than 5 kΩ to program OC
DS(on)
PGOOD
VSEN
FB
COMP / DIS
VCC
drop to measure the output
CC
F
.
- C
F
// C
P
to FB to
CC
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