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參數(shù)資料
| 型號(hào)： | LP2960IM-5.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Adjustable Micropower 0.5A Low-Dropout Regulators |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.8 V DROPOUT, PDSO16 |
| 封裝： | SMT-16 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大小： | 452K |
| 代理商： | LP2960IM-5.0 |
Application Hints
(Continued)
The Error signal becomes low as V
exceeds about 1.3V. It
goes high at about 5V input, where the output equals 4.75V.
Since the dropout voltage is load dependent, the input volt-
age trip points will vary with load current, but the output volt-
age trip point does not.
The comparator has an open-collector output which requires
an external pull-up resistor. This resistor may be connected
to the LP2960 output or another supply voltage.
Best operation is obtained by connecting the pull-up to the
LP2960 output. If the pull-up resistor is connected to an ex-
ternal 5V supply, the error flag will incorrectly signal “HIGH”
whenever V
IN
<
1.3V (see Error Output Timing Diagram).
In selecting a value for the pull-up resistor, note that while
the output can sink 400 μA, this current adds to battery drain.
Suggested values range from 100 k
–1 M
. The resistor is
not required if the output is unused.
If a large output capacitance is used, a false logic “HIGH”
can be generated when V
≈
1.3V. In this case, the error out-
put becomes a high impedance, causing the voltage at the
error output to rise to its pull-up value. If the pull-up resistor
is connected to V
, the error output can rise to 1.2V
(which is a logic “HIGH” signal incorrectly signifying the out-
put is in regulation).
The user may wish to divide down the error flag voltage us-
ing equal-value resistors (10 k
suggested) to ensure a
low-level logic signal during any fault condition, while still al-
lowing a valid high logic level during normal operation.
AUXILIARY COMPARATOR
The LP2960 contains an auxiliary comparator whose invert-
ing input is connected to the 1.23V reference. The auxiIiary
comparator has an open-collector output whose electrical
characteristics are similar to the dropout detection compara-
tor. The non-inverting input and output are brought out for
external connections.
SHUTDOWN INPUT
A logic-level signal will shut off the regulator output when a
“LOW” (
<
1.2V) is applied to the Shutdown input.
To prevent possible mis-operation, the Shutdown input must
be
actively
terminated.
If
the
input
is
driven
from
open-collector logic, a pull-up resistor (20 k
–100 k
rec-
ommended) should be connected from the Shutdown input
to the regulator input.
If the Shutdown input is driven from a source which actively
pulls low and high (like an op-amp), the puIl-up resistor is not
required, but may be used.
If the Shutdown input is to be unused, the cost of the pull-up
resistor can be saved by tying the Shutdown input directly to
the regulator input.
IMPORTANT:
Since the Absolute Maximum Ratings state
that the Shutdown input can not go more than 0.3V below
ground, the reverse-battery protection feature which protects
the regulator input is sacrificed if the Shutdown input is tied
directly to the regulator input.
If reverse-battery protection is required in an application, the
pull-up resistor between the Shutdown input and the regula-
tor input must be used
GROUND CONNECTIONS
The pins designated GND (see Connection Diagrams) must
be connected to the high-current ground point in the circuit.
The GND pins are electrically connected (through the lead
frame) to the die substrate, making them ideal for conducting
ground current or heat (see Heatsinking).
The parts in the surface-mount (M) package also have an
Analog Ground pin, which is the ground point on the die for
the regulator reference circuitry.
Along with the Sense pin, the availability of the Analog
Ground pin allows the designer the ability to use “remote”
sensing and eliminate output voltage errors due to IR drops
occurring along PC board traces.
IMPORTANT: The Analog Ground pin must be connected to
circuit ground at some point for the regulator to operate.
If remote sensing is not needed, the Analog Ground pin can
simply be pin-strapped to the adjacent GND pin.
HEATSINKING
A heatsink may be required with the LP2960 depending on
the maximum power dissipation and maximum ambient tem-
perature of the application. Under alI possible operating con-
ditions, the junction temperature must be within the range
specified under Absolute Maximum Ratings.
To determine if a heatsink is required, the power dissipated
by the regulator, P
D
, must be calculated.
The figure below shows the voltages and currents which are
present in the circuit, as welI as the formula for calcuIating
the power dissipated in the regulator:
Error Output Timing Diagram
DS011962-29
In shutdown mode, ERROR will go high if it has been pulled up to an
**
Exact value depends on dropout voltage. (See Application Hints)
Power Dissipation Diagram
DS011962-30
www.national.com
12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LP2960IN-3.3 | Adjustable Micropower 0.5A Low-Dropout Regulators |
| LP2960IN-5.0 | Adjustable Micropower 0.5A Low-Dropout Regulators |
| LP2960AIM-5.0 | Circular Connector; No. of Contacts:79; Series:MS27473; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:20; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:20-35 RoHS Compliant: No |
| LP2960AIN-3.3 | Circular Connector; No. of Contacts:41; Series:MS27473; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:20; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:20-41 RoHS Compliant: No |
| LP2960AIN-5.0 | Circular Connector; No. of Contacts:41; Series:MS27473; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:20; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:20-41 RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2960IMX-3.3 | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2960IMX-3.3/NOPB | 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| LP2960IMX-5.0 | 功能描述:IC REG LDO 5V .5A 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.3V 輸入電壓:最高 6V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.08V @ 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:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:LP3988IMFX-3.3 |
| LP2960IMX-5.0/NOPB | 功能描述:IC REG LDO 5V .5A 16-SOIC 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?。?- 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 |
| LP2960IN-5.0 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
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