SM74101 Datasheet, PDF (8/23 Pages) Texas Instruments – SM74101 Tiny 7A MOSFET Gate Driver

SM74101
SNOSBA2B – JULY 2011 – REVISED MAY 2015
7 Detailed Description
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7.1 Overview
The SM74101 is a high speed, high peak current (7A) single channel MOSFET driver. The high peak output
current of the SM74101 will switch power MOSFET’s on and off with short rise and fall times, thereby reducing
switching losses considerably. The SM74101 includes both inverting and non-inverting inputs that give the user
flexibility to drive the MOSFET with either active low or active high logic signals. The driver output stage consists
of a compound structure with MOS and bipolar transistor operating in parallel to optimize current capability over a
wide output voltage and operating temperature range. The bipolar device provides high peak current at the
critical Miller plateau region of the MOSFET V_GS , while the MOS device provides rail-to-rail output swing. The
totem pole output drives the MOSFET gate between the gate drive supply voltage V_CC and the power ground
potential at the V_EE pin.
7.2 Functional Block Diagram
V_CC
UVLO
IN
Level
OUT
Shift
INB
IN_REF
V_EE
7.3 Feature Description
7.3.1 Detailed Operating Description
The control inputs of the driver are high impedance CMOS buffers with TTL compatible threshold voltages. The
negative supply of the input buffer is connected to the input ground pin IN_REF. An internal level shifting circuit
connects the logic input buffers to the totem pole output drivers. The level shift circuit and the separate
input/output ground pins provide the option of single supply or split supply configurations. When driving the
MOSFET gate from a single positive supply, the IN_REF and V_EE pins are both connected to the power ground.
The isolated input and output stage grounds provide the capability to drive the MOSFET to a negative V_GS
voltage for a more robust and reliable off state. In split supply configuration, the IN_REF pin is connected to the
ground of the controller which drives the SM74101 inputs. The V_EE pin is connected to a negative bias supply
that can range from the IN_REF potential to as low as 14 V below the Vcc gate drive supply. For reliable
operation, the maximum voltage difference between V_CC and IN_REF or between V_CC and V_EE is 14V.
The minimum recommended operating voltage between Vcc and IN_REF is 3.5V. An Under Voltage Lock Out
(UVLO) circuit is included in the SM74101 which senses the voltage difference between V_CC and the input
ground pin, IN_REF. When the V_CC to IN_REF voltage difference falls below 2.8V the driver is disabled and the
output pin is held in the low state. The UVLO hysteresis prevents chattering during brown-out conditions; the
driver will resume normal operation when the V_CC to IN_REF differential voltage exceeds 3.0V.
8
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