1.2A DUAL HIGH-SPEED MOSFET DRIVERS
TC1426
TC1427
TC1428
ELECTRICAL CHARACTERISTICS:
Over operating temperature range with 4.5V
≤
V
DD
+
≤
16V unless
otherwise specified.
Symbol
Input
V
IH
V
IL
I
IN
Output
V
OH
V
OL
R
O
High Output Voltage
Low Output Voltage
Output Resistance
Test Figures 1 and 2
Test Figures 1 and 2
V
IN
= 0.8V,
I
OUT
= 10mA, V
DD
= 16V
V
IN
= 3V,
I
OUT
= 10mA, V
DD
= 16V
I
Latch-Up Current
Withstand Reverse Current
Switching Time
(Note 1)
t
R
t
F
t
D1
t
D2
I
S
Rise Time
Fall Time
Delay Time
Delay Time
Test Figures 1 and 2
Test Figures 1 and 2
Test Figures 1 and 2
Test Figures 1 and 2
—
—
—
—
—
—
—
—
60
40
125
125
nsec
nsec
nsec
nsec
V
DD
– 0.025
—
—
—
> 500
—
—
15
10
—
—
0.025
23
18
—
mA
V
V
Ω
Logic 1, Input Voltage
Logic 0, Input Voltage
Input Current
0V
≤
V
IN
≤
V
DD
3
—
– 10
—
—
—
—
0.8
10
V
V
µA
Parameter
Test Conditions
Min
Typ
Max
Unit
1
2
3
4
5
6
7
Power Supply
Power Supply Current
V
IN
= 3V (Both Inputs)
V
IN
= 0V (Both Inputs)
Note:
1. Switching times guaranteed by design.
—
—
—
—
13
0.7
mA
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.
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 V
DD
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 V
DD
. Input current is less
than 1µA 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.
4-209
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.
TELCOM SEMICONDUCTOR, INC.
8
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
