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LP2901-Q1 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. LP2901-Q1
Description  LOW-POWER QUAD DIFFERENTIAL COMPARATOR
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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APPLICATION INFORMATION
IN +
IN −
OUT
30 k
+
VCC
1/4 LP2901
IN +
IN −
100 k
1/4 LP2901
1/4 SN54/74LS00 or
1/4 SN54/74ALS1000A
VCC
+
12
3
OUT
VCC
VO
Q2
Q1
Q3
I1 = 6 µA
LP2901-Q1
LOW-POWER QUAD DIFFERENTIAL COMPARATOR
SLCS148 – SEPTEMBER 2005
Figure 1 shows the basic configuration for using the LP2901 comparator. Figure 2 shows the diagram for using it
as a CMOS driver.
Figure 1. Basic Comparator
Figure 2. CMOS Driver
All pins of any unused comparators should be grounded. The bias network of the LP2901 establishes a drain
current that is independent of the magnitude of the power-supply voltage over the range of 2 V to 30 V. It usually
is necessary to use a bypass capacitor across the power-supply line.
The differential input voltage may be larger than VCC without damaging the device. Protection should be provided
to prevent the input voltages from going negative by more than –0.3 V. The output section has two distinct
modes of operation, the Darlington mode and the ground-emitter mode. This unique drive circuit permits the
device to sink 30 mA at VO = 2 V in the Darlington mode and 700 µA at VO = 0.4 V in the ground-emitter mode.
Figure 3 is a simplified schematic diagram of the output section. The output section is configured in a Darlington
connection (ignoring Q3). If the output voltage is held high enough (above 1 V), Q1 is not saturated and the
output current is limited only by the product of the hFE of Q1, the hFE of Q2, and I1 and the 60-Ω saturation
resistance of Q2. The devices are capable of driving LEDs, relays, etc. in this mode while maintaining an
ultra-low power-supply current of 60
µA typical.
Figure 3. Output-Section Schematic Diagram
4




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