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參數(shù)資料
| 型號(hào)： | LM9072T |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Dual Tracking Low-Dropout System Regulator |
| 中文描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PZFM9 |
| 封裝： | POWER, TO-220, 9 PIN |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 477K |
| 代理商： | LM9072T |
Application Information
PIN DESCRIPTION AND FUNCTIONALITY
The LM9072 is a precision dual tracking voltage regulator
optimized for use in powertrain module applications but will
also find use in a wide variety of automotive and industrial
applications where precision supply regulation is required in
harsh operating environments. The following will describe
the functionality of each of the package pins.
INPUT VOLTAGE (Pin 3)
The LM9072 has been designed to connect directly to the ig-
nition or battery supply in automotive applications. For this
type of supply the regulator has been designed to withstand
up to +60V and 45V supply transients such as load dump.
An overvoltage shut down protection scheme turns OFF
both of the regulator outputs should supply transients ex-
ceed typically +33V to fully protect all load circuitry. This
higher threshold allows normal operation with 24 V
ap-
plied to the input as in the event when two batteries are used
to start a vehicle. Protection of the system is also provided
for inadvertent reverse polarity battery connections.
The current drain on the supply line is directly proportional to
the load currents on the two voltage regulators. With no load
current on either output the regulator requires 15 mA maxi-
mum quiescent current for biasing internal circuitry. During
dropout conditions (V
<
5.5V) the additional input current
can rise to 50% of the total load current. With less than 4V
applied to the input, internal biasing circuitry shuts OFF.
When switched OFF the regulator can remain connected to
the battery supply with a current drain of less than 100 μA.
MAIN OUTPUT (Pin 9)
The Main Output regulator provides a well controlled (3% tol-
erance maximum) 5V supply line with a total load current
ranging up to 350 mA. This relatively high level of output cur-
rent is sufficient to provide power to a large number of load
circuits in a variety of module applications.
This output has a short to ground current limit between
500 mA and 1A. The Main output can also withstand a short
circuit to potentials up to 7V.
To maintain stability of this supply line an output bypass ca-
pacitor is required. This capacitor must be at least 6 μF with
an equivalent series resistance (ESR) between 0.3
and 3
over temperature.
The Main Output is sensed for the generation of the system
reset output. Feedback from the Main Output is also used to
control the output voltage of the tracking regulator.
TRACKING OUTPUT (Pin 4)
The Tracking Output regulator is a key feature of the
LM9072. This output provides a voltage that directly tracks
the main output voltage within 1.5%. This 80 mA output is
provided to bias sensors and other devices located external
to the main system module.
For providing remote power the Tracking Output is fully pro-
tected against short circuit connections to the battery or input
supply (up to 27V) and to ground. These shorted fault condi-
tions do not affect the operation of the main supply nor gen-
erate a reset of the system.
The tracking characteristic allows for ratiometric operation of
sensors by providing power that is directly proportional to the
system supply. Similar to the main output a bypass capacitor
is required for stability. This capacitor should also be greater
than 6 μF with an ESR between 0.3
and 3
.
DS012906-17
FIGURE 1. Circuit Block Diagram
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM9073 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual High Current Low-Dropout System Regulator |
| LM9073S | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual High Current Low-Dropout System Regulator |
| LM9073SX | 功能描述:IC REG LDO 5V .7A/.1A TO-263-11 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
| LM9073T | 制造商:Rochester Electronics LLC 功能描述:5V DUAL OUTPUT TRACKING REGL - Bulk |
| LM9073T/NOPB | 功能描述:IC REG LDO 5V .7A/.1A TO-220-11 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
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