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LP3982ILD-2.77 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LP3982ILD-2.77
Description  Micropower, Ultra Low-Dropout, Low-Noise, 300mA CMOS Regulator
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP3982ILD-2.77 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Typical Performance Characteristics Unless otherwise specified, V
IN =VO + 0.5V, CIN =COUT =
2.2µF, C
CC = 33nF, TJ = 25˚C, VSHDN =VIN. (Continued)
Power-Up Response
Power-Down Response
20036911
20036912
Application Information
General Information
LP3982 is package, pin and performance compatible with
Maxim’s MAX8860 excluding reverse battery protection and
Dual Modefunction (fixed and adjustable combined).
Figure 1 shows the functional block diagram for the LP3982.
A 1.25V bandgap reference, an error amplifier and a PMOS
pass transistor perform voltage regulation while being sup-
ported by shutdown, fault, and the usual Temperature and
current protection circuitry
The regulator’s topology is the classic type with negative
feedback from the output to one of the inputs of the error
amplifier. Feedback resistors R
1 and R2 are either internal or
external to the IC, depending on whether it is the fixed
voltage version or the adjustable version. The negative feed-
back and high open loop gain of the error amplifier cause the
two inputs of the error amplifier to be virtually equal in
voltage. If the output voltage changes due to load changes,
the error amplifier provides the appropriate drive to the pass
transistor to maintain the error amplifier’s inputs as virtually
equal. In short, the error amplifier keeps the output voltage
constant in order to keep its inputs equal.
Output Voltage Setting (ADJ version only)
The output voltage is set according to the amount of nega-
tive feedback (Note that the pass transistor inverts the feed-
back signal.) Figure 2 simplifies the topology of the LP3982.
This type of regulator can be represented as an op amp
configured as non-inverting amplifier and a fixed DC Voltage
(V
REF) for its input signal. The special characteristic of this
op amp is its extra-large output transistor that only sources
current. In terms of its non-inverting configuration, the output
voltage equals V
REF times the closed loop gain:
Utilize the following equation for adjusting the output to a
particular voltage:
Choose R
2 = 100k to optimize accuracy, power supply re-
jection, noise and power consumption.
20036913
FIGURE 1. Functional Block Diagram for the LP3982
www.national.com
6


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