LTC1541IS8(V2) View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1541IS8 Datasheet PDF : 8 Pages
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APPLICATIONS INFORMATION
1000
100
10
1
0.1
0.001
0.01
0.1
1
CAPACITOR VALUE (µF)
10
LTC1541 • F02
Figure 2. Damping Resistance vs Bypass Capacitor Value
8 VCC
LTC1541
7 COMPOUT
5V TO 8V
6 REF
×1
R1
430Ω
–
COMP
C1
5 COMPIN+ +
1µF
GND
4
LTC1541 • F03a
Figure 3a. Reference Transient Response Test Circuit
LTC1541
Op Amp Stability
Unlike other industry standard micropower CMOS op
amps, the op amp in the LTC1541 maintains stability in
unity-gain configuration while driving heavy capacitive
loads of up to 1000pF.
Although this family is primarily designed for low frequency
applications, good layout is extremely important. Low power,
high impedance circuits may increase the effects of board
leakage and stray capacitance. For example, the combina-
tion of a 10M resistance (from leakage between traces on a
contaminated, poorly designed PC board) and a 2pF stray
capacitance provides a pole at approximately 8kHz, which is
near the amplifier’s bandwidth. Board routing and layout
should minimize leakage and stray capacitance. In some
cases, stray capacitance may be unavoidable and it may be
necessary to add a small capacitor across the feedback
resistor to compensate (Figure 4); select the smallest
capacitor value that ensures stability.
Inputs
The input common mode range for both the op amp and
comparator is from the negative supply to within 1.3V of the
positive supply. The inputs can be taken more than 300mV
below the negative supply without damaging the device if
the current out of the pin is limited to less than 1mA. Unlike
the bipolar input op amp and comparator, the output of the
LTC1541 will not reverse phase when the inputs are taken
above the common mode input range.
8V
V+
5V
VREF
OUT
2ms/DIV
LTC1541 • F03b
Figure 3b. Reference and Comparator Output Transient Response
AMPIN+ +
OP AMP
–
R2
AMPOUT
R1
2pF TO 10pF
LTC1541 • F04
Figure 4. Compensation for Feedback Node Capacitance
7
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