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參數(shù)資料
| 型號(hào)： | LT1579CS8-3.3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | CAP 33UF 80V ELECT TG SMD |
| 中文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.75 V DROPOUT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 15/20頁(yè) |
| 文件大小： | 352K |
| 代理商： | LT1579CS8-3.3 |
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15
LT1579
APPLICATIO
S I
N
FOR
ATIO
U
Example: The low-battery detector must be tripped at a
terminal voltage of 5.5V. There is a 100k pull-up resistor
to 5V on the output of the comparator and 200mV of
hysteresis is needed to prevent chatter. With a 1M resistor
for R1, what other resistor values are needed
Using the formulas in Figure 3,
)
.
–1 5
.
Use a standard value of 2.7M
. With the 100k pull-up
resistor, this gives a sink current and logic flag voltage of
approximately 45
μ
A at 0.4V. The hysteresis in this case
will be:
W
U
R
V
V
V
M
1
(
M
2
5 5
1 5
2 67
.
=
(
)
=
Hysteresis
mV
M
M
1
mV
=
+
=
18
1
2 7
.
67
An additional 133mV of hysteresis is needed, so a resistor
and diode must be added. The value of R3 will be:
R
V
mV
V
mV
V
M
M
3
1 5
(
18
133
2 7
.
10 5
=
+
)
(
)
=
.
–0 6
–0 4
.
A standard value of 10M
can be used. The additional
current flowing through R3 into the comparator output is
negligible and can usually be ignored
Logic Flags
The low-battery comparator outputs and the status flags
of the LT1579 are open collector outputs capable of
sinking up to 5mA. See the curve of Logic Flag Output
Voltage vs. Current in the Typical Performance Character-
istics.
There are two status flags on the LT1579. The BACKUP
flag and the DROPOUT flag provide information on which
input is supplying power to the load and give early warning
of loss of output regulation. The BACKUP flag goes low
when the secondary input begins supplying power to the
load. The DROPOUT flag signals the dropout condition on
both inputs, warning of an impending drop in output
voltage. The conditions that set either status flag are
determined by input to output voltage differentials and
current supplied to the load from each input. Normal
output deviation during transient load conditions (with
sufficient input voltages) will not set the status flags.
Timing Diagram
The timing diagram for the 5V dual battery supply is shown
in Figure 4. The schematic is the same as the 5V Dual
Battery Supply on the front of the data sheet. All logic flag
outputs have 100k pull-up resistors added. Note that there
is no time scale for the timing diagram. The timing diagram
is meant as a tool to help in understanding basic operation
of the LT1579. Actual discharge rates will be a function of
the load current and the type of batteries used. The load
current used in the example was 100mA DC.
Figure 4. Basic Dual Battery Timing Diagram
B
C
D
E
6V
5V
V
IN1
6V
5V
5V
0
0
0
1
1
0
1
0
1
0
100mA
4.8V
100mA
V
IN2
I
IN1
I
IN2
V
OUT
BACKUP
DROPOUT
LB02
LB01
LTC1579 F03
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1579CS8-5 | CAP 33UF 80V ELECT TG SMD |
| LT1579-3 | 300mA Dual Input Smart Battery Backup Regulator |
| LT1579CGN | 300mA Dual Input Smart Battery Backup Regulator |
| LT1579CGN-3 | 300mA Dual Input Smart Battery Backup Regulator |
| LT1579CGN-3.3 | 300mA Dual Input Smart Battery Backup Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
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| LT1579CS8-5 | 制造商:Linear Technology 功能描述:LDO Regulator Pos 5V 0.3A 8-Pin SOIC N |
| LT1579CS8-5#PBF | 功能描述:IC LDO REG SMART DUAL 5V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| LT1579CS8-5#TR | 功能描述:IC REG LDO SMART DUAL 5V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
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