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产品型号LM2941CSX的概述

LM2941CSX简介 LM2941CSX是一款高性能的线性稳压器，它的设计理念是提供稳定的输出电压，以满足各种电子设备的需求。这款芯片具有低压差、高电流输出能力以及良好的瞬态响应性能，适用于各种应用，包括但不限于电源管理、高保真音频设备、通信设备及其他需要稳定电压的电子系统。 LM2941CSX的主输出电压为5V，最大输出电流为1A，适用于绝大多数商业和工业应用。与其他稳压器相比，LM2941CSX在输入电压范围内具有相对较低的压降，这使得其在采用电池供电设备中的使用特别便利。此外，芯片内部集成了热关断和过流保护功能，大大提高了其在意外情况下的安全性。 LM2941CSX的详细参数 1. 输入电压范围：4.75V 至 26V 2. 输出电压：5V（固定） 3. 输出电流：最大 1A 4. 静态电流：约 5 mA 5. 压差：最大 0.5V（1A 时） 6. 纹波抑制比（PSRR）：典...

产品型号LM2941CSX的Datasheet PDF文件预览

LM2941, LM2941C

www.ti.com

SNVS770G –JUNE 1999–REVISED APRIL 2013

LM2941/LM2941C 1A Low Dropout Adjustable Regulator

Check for Samples: LM2941, LM2941C

FEATURES

DESCRIPTION

The LM2941 positive voltage regulator features the

ability to source 1A of output current with a typical

dropout voltage of 0.5V and a maximum of 1V over

•

WSON Space Saving Package

Output Voltage Adjustable From 5V to 20V

Dropout Voltage Typically 0.5V @ I_O= 1A

Output Current in Excess of 1A

Trimmed Reference Voltage

the entire temperature range. Furthermore,

quiescent current reduction circuit has been included

which reduces the ground pin current when the

differential between the input voltage and the output

voltage exceeds approximately 3V. The quiescent

current with 1A of output current and an input-output

differential of 5V is therefore only 30mA. Higher

quiescent currents only exist when the regulator is in

the dropout mode (V_IN− V_OUT≤ 3V).

Reverse Battery Protection

Internal Short Circuit Current Limit

Mirror Image Insertion Protection

P⁺Product Enhancement Tested

TTL, CMOS Compatible ON/OFF Switch

Designed also for vehicular applications, the LM2941

and all regulated circuitry are protected from reverse

battery installations or two-battery jumps. During line

transients, such as load dump when the input voltage

can momentarily exceed the specified maximum

operating voltage, the regulator will automatically shut

down to protect both the internal circuits and the load.

Familiar regulator features such as short circuit and

thermal overload protection are also provided.

Connection Diagrams

TO-220 Plastic Package

8-Lead WSON Surface Mount Package

ADJ

ON/OFF

GND

INPUT

N/C

GND*

N/C

Figure 1. Top View

See Package Number KC

OUTPUT

TO-263 Surface-Mount Package

* TIE TO GND OR LEAVE FLOATING

Figure 3. Top View

See Package Number NGN

Figure 2. See Package Number KTT

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

LM2941, LM2941C

SNVS770G –JUNE 1999–REVISED APRIL 2013

www.ti.com

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings⁽¹⁾⁽²⁾

LM2941T, LM2941S, LM2941LD

LM2941CT, LM2941CS

60V

45V

Input Voltage (Survival Voltage, ≤ 100ms)

(3)

Internal Power Dissipation

Internally Limited

150°C

Maximum Junction Temperature

Storage Temperature Range

−65°C ≤ T_J≤ +150°C

260°C, 10s

235°C, 30s

±2 kV

TO-220 (T), Wave

TO-263 (S)

Soldering Temperature⁽⁴⁾

WSON-8 (LD)

(5)

ESD Rating

(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for

which the device is intended to be functional, but device parameter specifications may not be ensured under these conditions. For

ensured specifications and test conditions, see the Electrical Characteristics.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and

specifications.

(3) The maximum power dissipation is a function of T_J(max), θ_JA, and T_A. The maximum allowable power dissipation at any ambient

temperature is P_D= (T_J(max) − T_A)/θ_JA. If this dissipation is exceeded, the die temperature will rise above 150°C and the LM2941 will go

into thermal shutdown. If the TO-263 package is used, the thermal resistance can be reduced by increasing the P.C. board copper area

thermally connected to the package: Using 0.5 square inches of copper area, θ_JAis 50°C/W; with 1 square inch of copper area, θ_JAis

37°C/W; and with 1.6 or more square inches of copper area, θ_JAis 32°C/W. Thermal performance for the WSON package was obtained

using a JESD51-7 board with six vias, using no airflow and an ambient temperature of 22°C. The value θ_JAfor the WSON package is

specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance

and power dissipation for the WSON package, refer to Application Note AN-1187 (literature number SNOA401). It is recommended that

6 vias be placed under the center pad to improve thermal performance.

(4) Refer to JEDEC J-STD-020C for surface mount device (SMD) package reflow profiles and conditions. Unless otherwise stated, the

temperature and time are for Sn-Pb (STD) only.

(5) The Human Body Model (HBM) is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin. Test method is per

JESD22–A114.

Operating Ratings

Maximum Input Voltage

26V

−40°C ≤ T_J≤ 125°C

0°C ≤ T_J≤ 125°C

−40°C ≤ T_J≤ 125°C

0°C ≤ T_J≤ 125°C

−40°C ≤ T_J≤ 125°C

LM2941T

LM2941CT

LM2941S

LM2941CS

LM2941LD

Temperature Range

Electrical Characteristics—LM2941T, LM2941S, LM2941LD

5V ≤ V_O≤ 20V, V_IN= V_O+ 5V, C_O= 22μF, unless otherwise specified. Specifications in standard typeface apply for T_J= 25°C,

while those in boldface type apply over the full Operating Temperature Range.

LM2941T

LM2941S

LM2941LD

Limit

Units

(Limits)

Parameter

Conditions

Typ

1.237/1.211

1.313/1.339

10/10

V(min)

V(max)

(1)

Reference Voltage

5mA ≤ I_O≤ 1A

1.275

Line Regulation

Load Regulation

V_O+ 2V ≤ V_IN≤ 26V, I_O= 5mA

50mA ≤ I_O≤ 1A

mV/V(max)

10/10

100 mADC and 20 mArms

f_O= 120Hz

Output Impedance

Quiescent Current

mΩ/V

V_O+ 2V ≤ V_IN< 26V, I_O= 5mA

15/20

45/60

mA(max)

V_IN= V_O+ 5V, I_O= 1A

(1) The output voltage range is 5V to 20V and is determined by the two external resistors, R1 and R2. See Typical Application Circuit.

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Product Folder Links: LM2941 LM2941C

LM2941, LM2941C

www.ti.com

SNVS770G –JUNE 1999–REVISED APRIL 2013

Electrical Characteristics—LM2941T, LM2941S, LM2941LD (continued)

5V ≤ V_O≤ 20V, V_IN= V_O+ 5V, C_O= 22μF, unless otherwise specified. Specifications in standard typeface apply for T_J= 25°C,

while those in boldface type apply over the full Operating Temperature Range.

LM2941T

LM2941S

LM2941LD

Limit

Units

(Limits)

Parameter

Conditions

Typ

10Hz–100kHz

I_O= 5mA

RMS Output Noise, % of V_OUT

0.003

Ripple Rejection

f_O= 120Hz, 1 Vrms, I_L= 100mA

0.005

0.4

0.02/0.04

%/V(max)

%/1000 Hr

V(max)

Long Term Stability

I_O= 1A

0.5

0.8/1.0

200/200

1.6

Dropout Voltage

I_O= 100mA

V_INMax = 26V⁽²⁾

110

1.9

mV(max)

A(min)

Short Circuit Current

Maximum Line Transient

V_OMax 1V Above Nominal V_O

R_O= 100, t ≤ 100ms

60/60

26/26

V(min)

V_DC

Maximum Operational Input Voltage

Reverse Polarity

DC Input Voltage

R_O= 100, V_O≥ −0.6V

t ≤ 100ms, R_O= 100Ω

−30

−15/−15

V(min)

Reverse Polarity

Transient Input Voltage

−75

1.30

−50/−50

0.80/0.80

2.00/2.00

100/300

V(min)

V(max)

V(min)

ON/OFF Threshold

Voltage ON

_O≤ 1A

ON/OFF Threshold

Voltage OFF

ON/OFF Threshold

Current

V_ON/OFF= 2.0V, I_O≤ 1A

μA(max)

(2) Output current capability will decrease with increasing temperature, but will not go below 1A at the maximum specified temperatures.

Electrical Characteristics—LM2941CT, LM2941CS

5V ≤ V_O≤ 20V, V_IN= V_O+ 5V, C_O= 22μF, unless otherwise specified. Specifications in standard typeface apply for T_J= 25°C,

while those in boldface type apply over the full Operating Temperature Range.

Limit

(1)

Units

(Limits)

V(min)

Parameter

Conditions

Typ

1.237/1.211

(2)

Reference Voltage

5mA ≤ I_O≤ 1A

1.275

1.313/1.339

V(max)

Line Regulation

Load Regulation

V_O+ 2V ≤ V_IN≤ 26V, I_O= 5mA

50mA ≤ I_O≤ 1A

mV/V(max)

100 mADC and 20 mArms

f_O= 120Hz

Output Impedance

Quiescent Current

mΩ/V

V_O+ 2V ≤ V_IN< 26V, I_O= 5mA

mA(max)

V_IN= V_O+ 5V, I_O= 1A

45/60

RMS Output Noise,

% of V_OUT

10Hz–100kHz

I_O= 5mA

0.003

Ripple Rejection

f_O= 120Hz, 1 Vrms, I_L= 100mA

0.005

0.4

0.02

%/V(max)

%/1000 Hr

V(max)

Long Term Stability

I_O= 1A

0.5

0.8/1.0

200/200

1.6

Dropout Voltage

I_O= 100mA

110

1.9

mV(max)

A(min)

(3)

Short Circuit Current

V_INMax = 26V

(1) All limits specified at room temperature (standard typeface) and at temperature extremes (boldface type). All room temperature limits are

100% production tested. All limits at temperature extremes are ensured via correlation using standard Statistical Quality Control (SQC)

methods.

(2) The output voltage range is 5V to 20V and is determined by the two external resistors, R1 and R2. See Typical Application Circuit.

(3) Output current capability will decrease with increasing temperature, but will not go below 1A at the maximum specified temperatures.

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Product Folder Links: LM2941 LM2941C

LM2941, LM2941C

SNVS770G –JUNE 1999–REVISED APRIL 2013

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Electrical Characteristics—LM2941CT, LM2941CS (continued)

5V ≤ V_O≤ 20V, V_IN= V_O+ 5V, C_O= 22μF, unless otherwise specified. Specifications in standard typeface apply for T_J= 25°C,

while those in boldface type apply over the full Operating Temperature Range.

Limit

(1)

Units

Parameter

Conditions

Typ

(Limits)

Maximum Line

Transient

V_OMax 1V Above Nominal V_O

R_O= 100Ω, T ≤ 100ms

V(min)

V_DC

Maximum Operational

Input Voltage

Reverse Polarity

DC Input Voltage

R_O= 100Ω, V_O≥ −0.6V

T ≤ 100ms, R_O= 100Ω

−30

−55

1.30

−15

−45

0.80

2.00

100

V(min)

V(max)

V(min)

μA(max)

Reverse Polarity

Transient Input Voltage

ON/OFF Threshold

Voltage ON

_O≤ 1A

ON/OFF Threshold

Voltage OFF

ON/OFF Threshold

Current

V_ON/OFF= 2.0V, I_O≤ 1A

Thermal Performance

Thermal Resistance

Junction-to-Case, θ_JC

5-Lead TO-220

°C/W

5-Lead TO-263

8-Lead WSON

5.3

Thermal Resistance

Junction-to-Ambient, θ_JA

5-Lead TO-220

(1)

5-Lead TO-263 (See TO-263 Mounting)

8-Lead WSON (See WSON Mounting)

(1) The maximum power dissipation is a function of T_J(max), θ_JA, and T_A. The maximum allowable power dissipation at any ambient