LX8941_07 [MICROSEMI]

PRELIMINARY DATA SHEET; 初步数据表


型号：	LX8941_07
厂家：	Microsemi
描述：	PRELIMINARY DATA SHEET 初步数据表
文件：	总5页 (文件大小：144K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LX8941

Adjustable Low Dropout Regulator

PRELIMINARY DATA SHEET

KEY FEATURES

DESCRIPTION

The Microsemi LX8941 is an

This feature makes it ideal for some

2% Internally Trimmed Output

Output Current In Excess of 1A

Input – Output Differential Less

Than 0.8V @ 1A

Reverse Battery Protection

Short Circuit Protection

Internal Thermal Overload

Protection

adjustable, low dropout regulator rated for processor applications that require 4V

more than 1A of output current. It can operation from a 5V supply. In addition, the

regulate with as low as 0.8V headroom LX8941 provides an on / off switch that

between the input and output voltages, at reduces the IC quiescent current when

1A output current, thus minimizing power activated, making it ideal for battery

dissipation. In addition, it can be used in operated applications.

applications where worst case supplies

require a low input / output differential to

maintain regulation.

Available in 5-Lead Plastic TO-

220 & Surface-Mount TO-263

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

PRODUCT HIGHLIGHT

Dropout Voltage vs. Output

Current vs. Temperature

OUT

600

500

400

Part

LX8941

412

10 µF

ADJ

22µF

300

187

OFF

125°C

200

25°C

-40°C

100

500

1000

Output Current (mA)

PACKAGE ORDER INFO

Plastic TO-220

5 pin

Plastic TO-263

5 Pin

T_A(°C)

RoHS Compliant / Pb-free

Transition DC: 0543

Transition DC: 0535

0 to 70

LX8941CP

LX8941CDD

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8941CDD-TR)

Rev. 0.7a, 2005-11-10

Microsemi

Page 1

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX8941

Adjustable Low Dropout Regulator

PRELIMINARY DATA SHEET

ABSOLUTE MAXIMUM RATINGS

PACKAGE PIN OUT

Input Voltage (V_IN)........................................................................................................26V

Operating Temperature Range................................................................................... 150°C

Storage Temperature Range.........................................................................-65°C to 150°C

Lead Temperature (Soldering 10 seconds)................................................................. 300°C

Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260°C (+0 -5)

TAB is GND

ON/OFF

ADJ

GND

V_O

V_IN

P PACKAGE

(Top View)

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to

Ground. Currents are positive into, negative out of specified terminal.

TAB is GND

ON/OFF

ADJ

GND

THERMAL DATA

V_O

V_IN

Plastic TO-220 5-Pin

DD PACKAGE

(Top View)

THERMAL RESISTANCE-JUNCTION TO TAB, θ_JT

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ_JA

4.5°C/W

60°C/W

RoHS / Pb-free 100% matte Tin Lead Finish

Plastic TO-263 5-Pin

THERMAL RESISTANCE-JUNCTION TO CASE, θ_JC

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ_JA

4.5°C/W

60°C/W

Junction Temperature Calculation: T_J= T_A+ (P_Dx θ_JA).

The θ_JAnumbers are guidelines for the thermal performance of the device/pc-board system. All of the

above assume no ambient airflow.

RECOMMENDED OPERATING CONDITIONS

LX8941

Typ

Parameter

Symbol

Units

Min

3.8

0.1

Max

1000

Input Voltage (Note 2)

VIN

Load Current (with Adequate Heatsinking)

Input Capacitor (VIN to GND)

Output Capacitor with ESR of 10Ω max., (VOUT to GND)

µF

Rev. 0.7a, 2005-11-10

Microsemi

Page 2

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX8941

Adjustable Low Dropout Regulator

PRELIMINARY DATA SHEET

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, the following specifications apply over the operating ambient temperature of 0°C to 125°C for the LX8941CP;

_IN= 10V, I_O= 1A, C_OUT= 22µF and are for DC characteristics only. Low duty cycle pulse testing techniques are used which maintain

junction and case temperatures equal to the ambient temperature. Note 3: The output voltage range is 4 to 25V and is determined by the

two external resistor, R1 and R2. See Product Highlight.

LX8941

Parameter

Symbol

Test Conditions

I_O= 0A, T_A= 25°C

V_O+ 2V < V_IN< 26V, I_O= 5mA

50mA < I_O< 1A, V_O= V_ADJ

I_O= 100mA

I_O= 500mA

I_O= 1A

I_O= < 5mA, 7 < V_IN< 26V

I_O= 500mA

Units

Min

1.225

Typ

1.25

Max

1.275

ADJ Pin Voltage (Note 3)

Line Regulation

Load Regulation

V_ADJ

∆V_OI

∆V_OL

150

275

400

300

500

800

Dropout Voltage

∆V

Quiescent Current

I_Q

I_O= 1000mA

V_IN= 10V, I_O= 1A

V_IN= 26V

115

1.2

150

180

µA

µV_RMS

mV /

1000hr

Adjust Pin Current

Current Limit

I_ADJ

I_CL

Output Noise Voltage (Note 4)

V_{O RMS}

10Hz – 100kHz, IO = 5mA

Long Term Stability (Note 4)

Ripple Rejection (Note 4)

Enable Logic Section

On Threshold Voltage

On Threshold Current

Off Threshold Voltage

Off Threshold Current

R_R

f_O= 120Hz, 1V_RMS, I_O= 100mA

µA

0.1

0.8

-10

-0.3

µA

Note 4: These parameters although guaranteed, are not tested in production.

SIMPLIFIED BLOCK DIAGRAM

INPUT

VOLTAGE

V_IN

C1*

0.1µF

LX8941

V_O

OUTPUT

VOLTAGE

10µF

Thermal

Shutdown

ADJ

ON /

OFF

ON / OFF

Circuit

OFF

GND

Figure 1 – Simplified Block Diagram

Rev. 0.7a, 2005-11-10

Microsemi

Page 3

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX8941

Adjustable Low Dropout Regulator

PRELIMINARY DATA SHEET

PACKAGE DIMENSIONS

3-Pin Plastic TO-263

MILLIMETERS

INCHES

Dim

MIN

10.03

8.51

4.19

1.14

0.330

1.19

2.41

2.29

–

MAX

10.67

9.17

4.59

1.40

0.51

1.34

2.66

2.79

1.65

0.25

15.87

MIN

MAX

0.420

0.361

0.181

0.055

0.020

0.053

0.104

0.110

0.065

0.010

0.625

0.395

0.335

0.165

0.045

0.013

0.047

0.095

0.090

–

14.60

0.575

7°

3°

7°

3°

0° -8°

Seating Plane

5-Pin Plastic TO-220

MILLIMETERS

INCHES

Dim

MIN

14.23

9.66

3.56

0.46

3.56

3.40

0.31

12.70

MAX

16.51

10.66

4.82

0.89

4.06

MIN

MAX

0.650

0.420

0.190

0.035

0.160

0.560

0.380

0.140

0.018

0.140

0.134

0.012

0.500

1.14

14.73

0.045

0.580

6.80 TYP

0.268 TYP

2.04

1.14

5.85

2.92

1.39

6.85

0.080

0.045

0.230

0.115

0.055

0.270

Note:

1. Dimensions do not include mold flash or protrusions;

these shall not exceed 0.155mm(.006”) on any side.

Lead dimension shall not include solder coverage.

Rev. 0.7a, 2005-11-10

Microsemi

Page 4

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX8941

Adjustable Low Dropout Regulator

PRELIMINARY DATA SHEET

NOTES

PRELIMINARY DATA – Information contained in this document is pre-production data

and is proprietary to Microsemi. It may not be modified in any way without the express

written consent of Microsemi. Product referred to herein is offered in pre-production form

only and may not have completed Microsemi’s Quality Assurance process for Release to

Production. Microsemi reserves the right to change or discontinue this proposed product

at any time.

Rev. 0.7a, 2005-11-10

Microsemi

Integrated Products Division

Page 5

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

LX8941_07 [MICROSEMI]

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