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TC1426 Datasheet(PDF) 3 Page - TelCom Semiconductor, Inc

Part No. TC1426
Description  1.2A DUAL HIGH-SPEED MOSFET DRIVERS
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Maker  TELCOM [TelCom Semiconductor, Inc]
Homepage  http://www.telcom-semi.com
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TC1426 Datasheet(HTML) 3 Page - TelCom Semiconductor, Inc

   
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TELCOM SEMICONDUCTOR, INC.
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1.2A DUAL HIGH-SPEED MOSFET DRIVERS
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
3
V
VIL
Logic 0, Input Voltage
0.8
V
IIN
Input Current
0V
≤ VIN ≤ VDD
– 10
10
µA
Output
VOH
High Output Voltage
Test Figures 1 and 2
VDD – 0.025
V
VOL
Low Output Voltage
Test Figures 1 and 2
0.025
V
RO
Output Resistance
VIN = 0.8V,
15
23
IOUT = 10mA, VDD = 16V
VIN = 3V,
10
18
IOUT = 10mA, VDD = 16V
I
Latch-Up Current
Withstand Reverse Current
> 500
mA
Switching Time (Note 1)
tR
Rise Time
Test Figures 1 and 2
60
nsec
tF
Fall Time
Test Figures 1 and 2
40
nsec
tD1
Delay Time
Test Figures 1 and 2
125
nsec
tD2
Delay Time
Test Figures 1 and 2
125
nsec
Power Supply
IS
Power Supply Current
VIN = 3V (Both Inputs)
13
mA
VIN = 0V (Both Inputs)
0.7
Note: 1. Switching times guaranteed by design.
SUPPLY BYPASSING
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.
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.
INPUT STAGE
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 1
µA over this range.
The TC1426/27/28 may be directly driven by the TL494,
SG1526/27, TC38C42, TC170 and similar switch-mode
power supply integrated circuits.


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