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KM4111 Datasheet(PDF) 6 Page - Fairchild Semiconductor

Part No. KM4111
Description  0.2mA, Low Cost, 2.7V & 5V, 35MHz Rail-to-Rail Amplifiers
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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KM4111 Datasheet(HTML) 6 Page - Fairchild Semiconductor

 
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6
REV. 1B June 2001
General Description
The KM4111 is a single supply, general purpose, voltage-
feedback amplifier fabricated on a complementary
bipolar process. The KM4111 offers 35MHz unity gain
bandwidth, 27V/
µs slew rate, and only 208µA supply
current. It features a rail-to-rail output stage and is
unity gain stable.
The design utilizes a patent pending topology that
provides increased slew rate performance. The common
mode input range extends to 300mV below ground
and to 1.2V below Vs. Exceeding these values will not
cause phase reversal. However, if the input voltage
exceeds the rails by more than 0.5V, the input ESD
devices will begin to conduct. The output will stay at
the rail during this overdrive condition.
The design uses a Darlington output stage. The out-
put stage is short circuit protected and offers “soft”
saturation protection that improves recovery time.
The typical circuit schematic is shown in Figure 1.
Figure 1: Typical Configuration
Enable/Disable Function (KM4121)
The KM4121 offers an active-low disable pin that can
be used to lower its supply current. Leave the pin
floating to enable the part. Pull the disable pin to the
negative supply (which is ground in a single supply
application) to disable the output. During the disable
condition, the nominal supply current will drop to
below 40
µA and the output will be at high impedance
with about 2pF capacitance.
Power Dissipation
The maximum internal power dissipation allowed is
directly related to the maximum junction tempera-
ture. If the maximum junction temperature exceeds
150°C, some reliability degradation will occur. If the
maximum junction temperature exceeds 175°C for an
extended time, device failure may occur.
The KM4111 is short circuit protected. However, this
may not guarantee that the maximum junction
temperature (+150°C) is not exceeded under all
conditions. Follow the maximum power derating
curves shown in Figure 2 to ensure proper operation.
Figure 2: Power Derating Curves
Overdrive Recovery
For an amplifier, an overdrive condition occurs when
the output and/or input ranges are exceeded. The
recovery time varies based on whether the input or
output is overdriven and by how much the ranges are
exceeded. The KM4111 will typically recover in less
than 20ns from an overdrive condition. Figure 3 shows
the KM4111 in an overdriven condition.
Figure 3: Overdrive Recovery
Driving Capacitive Loads
A small series resistance (Rs) at the output of the
amplifier, illustrated in Figure 4, will improve stability
and settling performance.
+
-
KM4111
Rf
0.01
µF
6.8
µF
Out
In
+Vs
+
Rg
Maximum Power Dissipation
Ambient Temperature ( C)
-50
-30
-10
10
30
50
70
90
0
0.5
1.0
1.5
2.0
SOT23-6 lead
SOT23-5 lead
Time (1
µs/div)
Input
Output
DATA SHEET
KM4111/KM4121


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