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LP3982 데이터시트(PDF) 12 Page - Texas Instruments

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부품명 LP3982
상세설명  LP3982 Micropower, Ultra Low-Dropout, Low-Noise, 300 mA CMOS Regulator
PDF  23 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

LP3982 데이터시트(HTML) 12 Page - Texas Instruments

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1
R3 =
+
-
1
1
R1
GT
R2
1
1
R1
VLT
VREF (GT)
R2
-
=
VREF (GT)
VUT1
R1 =
1
1
1
R3
R2
R1
GT =
+
+
VUT = R1 (VREF) GT
VLT = R1 // R2 (VREF) GT
+
-
VB
LM385A-1.2V
LMC7215
R1
R3
R2
R4
VREF
2.74M
180k
768k
301k
2.22F
VB
4 Cells
NiMH
SHDN
GND
IN
OUT
LP3982
FAULT
100k
2.22F
CERAMIC
LP3982
SNVS185D – FEBRUARY 2002 – REVISED APRIL 2013
www.ti.com
Figure 21. Minimum Battery Detector that Disconnects the Load Via the SHDN Pin of the LP3982
Resistor value for VUT and VLT are determined as follows:
(8)
(The application of Figure 21 used a GT of 5μ mho)
(9)
(10)
(11)
The above procedure assumes a rail-to-rail output comparator. Essentially, R2 is in parallel with R1 prior to
reaching the lower threshold, then R2 becomes parallel with R3 for the upper threshold. Note that the application
requires rail-to-rail input as well.
The resistor values shown in Figure 21 are the closest practical to calculated values.
Fast Start-Up
The LP3982 provides fast start-up time for better system efficiency. The start-up speed is maintained when using
the optional noise bypass capacitor. An internal 500
μA current source charges the capacitor until it reaches
about 90% of its final value.
12
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Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LP3982



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