L6727 STMicroelectronics, L6727 Datasheet - Page 5

• Manufacturer Part Number: L6727
• Description: IC PWM CTLR SGL PHASE SO-8
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L6727

• Internal Switch(s): No
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: Adj to 0.8V
• Frequency - Switching: 300kHz
• Voltage - Input: 1.5 ~ 12 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Output Current: 1.5 A
• Input Voltage: - 0.3 V to + 15 V
• Switching Frequency: 300 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 80 %
• For Use With: 497-8266 - BOARD EVAL BASED ON L6727497-6258 - BOARD EVAL 1PH STPDWN CONV L6727
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6727
2
2.1
Pins description and connection diagrams
Figure 3.
Pin descriptions
Table 2.
Pin #
1
2
3
4
5
6
7
8
COMP / DIS
PHASE
UGATE
Pins connection (top view)
Pins descriptions
LGATE
BOOT
Name
GND
VCC
/ OC
FB
UGATE
LGATE
BOOT
GND
HS driver supply.
Connect through a capacitor (100 nF) to the floating node (LS-drain) pin
and provide necessary bootstrap diode from VCC.
HS driver output. Connect to HS MOSFET gate.
All internal references, logic and drivers are connected to this pin.
Connect to the PCB ground plane.
LS driver output. Connect to LS MOSFET gate.
Device and LS driver power supply.
Operative range from 4.1 V to 13.2 V. Filter with at least 1μF MLCC to GND.
Error Amplifier Inverting Input.
Connect with a resistor R
resistor R
reference.
COMP. Error amplifier output. Connect with an R
compensate the control-loop.
DIS. The device can be disabled by forcing this pin lower than 0.5V(typ). To
disable the device, the external pull-down need to overcome 10mA of
COMP output current for about 15 μs. Once disabled, COMP output current
drops to 20 μA.
OC. Over current threshold set. Connect with an R
(ONLY IF VCC is supplied by 5 V bus) to program OC threshold. When
VCC > 5V, R
HS driver return path, current-reading and adaptive-dead-time monitor.
Connect to the LS drain to sense R
This pin is also used by the adaptive-dead-time control circuitry to monitor
when HS MOSFET is OFF.
Doc ID 12933 Rev 4
OS
1
2
3
4
OCSET
to GND may be used to regulate voltages higher than the
L6727
need to be not-connected.
Pins description and connection diagrams
FB
8
7
6
5
to the output regulated voltage. Additional
Function
PHASE
COMP / DIS / OC
FB
VCC
dsON
drop to measure the output current.
F
- C
OCSET
F
// C
resistor to VCC
P
to FB to
5/34