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L6743B

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Pins description and connection diagrams L6743B
4/16
2 Pins description and connection diagrams
2.1 Pin description
Table 1. Pin description
Figure 3. Pins connection (top view)
Pin # Name Function
1BOOT
High-side driver supply.
This pin supplies the high-side floating driver. Connect through a
R
BOOT
- C
BOOT
capacitor to the PHASE pin.
Internally connected to the cathode of the integrated bootstrap diode. See
Section 5.3 for guidance in designing the capacitor value.
2PWM
Control input for the driver, 5 V compatible.
This pin controls the state of the driver and which external MOSFET have to
be turned-ON according to EN status. If left floating and in conjunction with EN
asserted, it causes the driver to enter the high-impedance (HiZ) state which
causes all MOSFETs to be OFF. See Section 5.1 for details about HiZ.
3EN
Enable input for the driver. Internally pulled low by 15 kΩ.
Pull high to enable the driver according to the PWM status. If pulled low will
cause the drive to enter HiZ state with all MOSFET OFF regardless of the
PWM status.
See Section 5.1 for details about HiZ.
4VCC
Device and LS driver power supply. Connect to any voltage between 5 V and
12 V. Bypass with low-ESR MLCC capacitor to GND.
5LGATE
Low-side driver output.
Connect directly to the low-side MOSFET gate. A small series resistor can be
useful to reduce dissipated power especially in high frequency applications.
6GND
All internal references, logic and drivers are referenced to this pin. Connect to
the PCB ground plane.
7 PHASE
high-side driver return path. Connect to the high-side MOSFET source.
This pin is also monitored for the adaptive dead-time management and pre-
OV protection.
8UGATE
high-side driver output.
Connect to high-side MOSFET gate.
-TH. PAD
Thermal pad connects the silicon substrate and makes good thermal contact
with the PCB. Connect to the PGND plane.
L6743B Maximum ratings
5/16
3 Maximum ratings
3.1 Absolute maximum ratings
Table 2. Absolute maximum ratings
3.2 Thermal data
Table 3. Thermal data
Symbol Parameter Value Unit
V
CC,
V
PVCC
to GND -0.3 to 15 V
V
BOOT
, V
UGATE
to GND
to PHASE
41
15
V
V
PHASE
to GND -8 to 26 V
V
LGATE
to GND -0.3 to VCC + 0.3 V
V
PWM,
V
EN
to GND -0.3 to 7 V
V
CC,
V
PVCC
to GND -0.3 to 15 V
Symbol Parameter Value Unit
R
THJA
Thermal resistance junction to ambient
(Device soldered on 2s2p, 67 mm x 69 mm board)
45 °C/W
R
THJC
Thermal resistance junction to case 5 °C/W
T
MAX
Maximum junction temperature 150 °C
T
STG
Storage temperature range 0 to 150 °C
T
J
Junction temperature range 0 to 125 °C
P
TOT
Maximum power dissipation at 25 °C
(Device soldered on 2s2p PC board)
2.25 W
Electrical specifications L6743B
6/16
4 Electrical specifications
4.1 Electrical characteristics
Table 4. Electrical characteristics
(V
CC
= 12 V±15 %, T
J
= 0 °C to 70 °C unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
Supply current and power-on
I
CC
VCC supply current
UGATE and LGATE = OPEN
BOOT = 12 V
5mA
I
BOOT
BOOT supply current
UGATE = OPEN;
PHASE to GND; BOOT = 12 V
2mA
UVLO
VCC
VCC turn-ON VCC rising 4.1 V
VCC turn-OFF VCC falling 3.5 V
PWM and EN input
PWM
Input high - V
PWM_IH
PWM rising 2 V
Input low - V
PWM_IL
PWM falling 0.8 V
Input leakage
PWM = 3.3 V 270 µA
PWM = 0 V -360 µA
t
HiZ
HiZ hold-off time See Figure 4 150 ns
t
prop_L
Propagation delays See Figure 4
50 75 ns
t
prop_H
30 45 ns
EN
Input high - V
EN_IH
EN rising 2 V
Input low - V
EN_IH
EN falling 0.8 V
Input resistance to GND 15 kΩ
Input leakage EN = 3.3 V 220 µA
Gate drivers
R
HIHS
HS source resistance BOOT - PHASE = 12 V; 100 mA 2.3 2.8 Ω
I
UGATE
HS source current
(1)
1. Parameter(s) guaranteed by designed, not fully tested in production
BOOT - PHASE = 12 V;
C
UGATE
to PHASE = 3.3 nF
2A
R
LOHS
HS sink resistance BOOT - PHASE = 12 V; 100 mA 2 2.5 Ω
R
HILS
LS source resistance 100 mA 1.3 1.8 Ω
I
LGATE
LS source current
(1)
C
LGATE
to GND = 5.6 nF 3 A
R
LOLS
LS sink resistance 100 mA 1 1.5 Ω
Protections
V
PRE_OV
Pre-OV threshold PHASE rising 1.8 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

L6743B

Mfr. #:
Buy L6743B
Manufacturer:
STMicroelectronics
Description:
Gate Drivers Hi-current MOSFET Driver
Lifecycle:
New from this manufacturer.
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