1.2A DUAL HIGH-SPEED MOSFET DRIVERS
1
2
3
4
5
6
7
8
TC1426
TC1427
TC1428
ELECTRICAL CHARACTERISTICS: Over operating temperature range with 4.5V ≤ VDD + ≤ 16V unless
otherwise specified.
Symbol
Parameter
Test Conditions
Min
Typ
Max
Unit
Input
VIH
Logic 1, Input Voltage
Logic 0, Input Voltage
Input Current
3
—
—
—
—
0.8
10
V
V
VIL
IIN
—
0V ≤ VIN ≤ VDD
– 10
µA
Output
VOH
High Output Voltage
Low Output Voltage
Output Resistance
Test Figures 1 and 2
Test Figures 1 and 2
VDD – 0.025
—
—
15
—
0.025
23
V
V
Ω
VOL
RO
—
—
VIN = 0.8V,
IOUT = 10mA, VDD = 16V
VIN = 3V,
IOUT = 10mA, VDD = 16V
—
10
—
18
—
I
Latch-Up Current
Withstand Reverse Current
> 500
mA
Switching Time (Note 1)
tR
Rise Time
Fall Time
Test Figures 1 and 2
Test Figures 1 and 2
Test Figures 1 and 2
Test Figures 1 and 2
—
—
—
—
—
—
—
—
60
40
nsec
nsec
nsec
nsec
tF
tD1
Delay Time
Delay Time
125
125
tD2
Power Supply
IS
Power Supply Current
VIN = 3V (Both Inputs)
VIN = 0V (Both Inputs)
—
—
—
—
13
mA
0.7
Note: 1. Switching times guaranteed by design.
SUPPLY BYPASSING
INPUT STAGE
Large currents are required to charge and discharge
capacitive loads quickly. For example, charging a 1000-pF
load to 16V in 25nsec requires an 0.8A current from the
device power supply.
To guarantee low supply impedance over a wide fre-
quency range, a parallel capacitor combination is recom-
mended for supply bypassing. Low-inductance ceramic
MLC capacitors with short lead lengths (< 0.5-in.) should
be used. A 1.0-µF film capacitor in parallel with one or two
0.1-µF ceramic MLC capacitors normally provides adequate
bypassing.
The input voltage level changes the no-load or quies-
cent supply current. The N-channel MOSFET input stage
transistor drives a 2.5 mA current source load. With a logic
"1" input, the maximum quiescent supply current is 9mA.
Logic "0" input level signals reduce quiescent current to 500
µA maximum. Unused driver inputs must be connected
to VDD or GND. Minimum power dissipation occurs for logic
"0" inputs for the TC1426/27/28.
The drivers are designed with 100 mV of hysteresis.
This provides clean transitions and minimizes output stage
current spiking when changing states. Input voltage thresh-
olds are approximately 1.5V, making logic "1" input any
voltage greater than 1.5V up to VDD. Input current is less
than 1µA over this range.
GROUNDING
The TC1426 and TC1428 contain inverting drivers.
Individual ground returns for the input and output circuits or
a ground plane should be used. This will reduce negative
feedback that causes degradation in switching speed char-
acteristics.
The TC1426/27/28 may be directly driven by the TL494,
SG1526/27, TC38C42, TC170 and similar switch-mode
power supply integrated circuits.
TELCOM SEMICONDUCTOR, INC.
4-209
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
