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LX8941
TM (R)
Adjustable Low Dropout Regulator
PRELIMINARY DATA SHEET
DESCRIPTION The Microsemi LX8941 is an adjustable, low dropout regulator rated for more than 1A of output current. It can regulate with as low as 0.8V headroom between the input and output voltages, at 1A output current, thus minimizing power dissipation. In addition, it can be used in applications where worst case supplies require a low input / output differential to maintain regulation. This feature makes it ideal for some processor applications that require 4V operation from a 5V supply. In addition, the LX8941 provides an on / off switch that reduces the IC quiescent current when activated, making it ideal for battery operated applications.
KEY FEATURES 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 Available in 5-Lead Plastic TO220 & Surface-Mount TO-263
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IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
PRODUCT HIGHLIGHT
Dropout Voltage vs. Output Current vs. Temperature
5V 10 F
ON OFF R2 187
IN
Dropout Voltage - (mV)
Part LX8941
OUT
R1 412
4V
600 500 400 300 200 100 0 100 500 1000 Output Current (mA)
125C 25C -40C
ADJ
22F
PACKAGE ORDER INFO
TA (C) 0 to 70
P
Plastic TO-220 5 pin LX8941CP
DD
Plastic TO-263 5 Pin LX8941CDD
LX8941 LX8941
RoHS Compliant / Pb-free Transition DC: 0543
RoHS Compliant / Pb-free Transition DC: 0535
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX8941CDD-TR)
Copyright (c) 2001 Rev. 0.7a, 2005-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX8941
TM (R)
Adjustable Low Dropout Regulator
PRELIMINARY DATA SHEET
ABSOLUTE MAXIMUM RATINGS Input Voltage (VIN) ........................................................................................................26V Operating Temperature Range ................................................................................... 150C Storage Temperature Range.........................................................................-65C to 150C Lead Temperature (Soldering 10 seconds)................................................................. 300C Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260C (+0 -5)
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.
PACKAGE PIN OUT
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TAB is GND
5 4 3 2 1
ON/OFF ADJ GND VO VIN
P PACKAGE
(Top View)
TAB is GND
5 4
ON/OFF ADJ GND VO VIN
THERMAL DATA
3 2
P
Plastic TO-220 5-Pin 4.5C/W 60C/W
1
THERMAL RESISTANCE-JUNCTION TO TAB, JT
DD PACKAGE
(Top View)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
RoHS / Pb-free 100% matte Tin Lead Finish
DD
Plastic TO-263 5-Pin 4.5C/W 60C/W
THERMAL RESISTANCE-JUNCTION TO CASE, JC
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS Parameter Input Voltage (Note 2) Load Current (with Adequate Heatsinking) Input Capacitor (VIN to GND) Output Capacitor with ESR of 10 max., (VOUT to GND) Symbol VIN LX8941 Typ Units V mA F F
Min 3.8 5 0.1 10
Max 26 1000
P D PACKAGE DATA
Copyright (c) 2001 Rev. 0.7a, 2005-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX8941
TM (R)
Adjustable Low Dropout Regulator
PRELIMINARY DATA SHEET
ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature of 0C to 125C for the LX8941CP; VIN = 10V, IO = 1A, COUT = 22F 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.
Parameter ADJ Pin Voltage (Note 3) Line Regulation Load Regulation Dropout Voltage Symbol VADJ VOI VOL V Test Conditions IO = 0A, TA = 25C VO + 2V < VIN < 26V, IO = 5mA 50mA < IO < 1A, VO = VADJ IO = 100mA IO = 500mA IO = 1A IO = < 5mA, 7 < VIN < 26V IO = 500mA IO = 1000mA VIN = 10V, IO = 1A VIN = 26V 10Hz - 100kHz, IO = 5mA fO = 120Hz, 1VRMS, IO = 100mA 2 0.1 -10 -0.3 50 0.8 LX8941 Typ 1.25 1 10 150 275 400 3 30 115 2 1.2 150 20 RR 66 Units V mV mV mV mV mV mA mA mA A A VRMS mV / 1000hr dB V A V A
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Min 1.225
Quiescent Current Adjust Pin Current Current Limit Output Noise Voltage (Note 4) Long Term Stability (Note 4) Ripple Rejection (Note 4) Enable Logic Section On Threshold Voltage On Threshold Current Off Threshold Voltage Off Threshold Current
IQ IADJ ICL VO RMS
Max 1.275 50 50 300 500 800 15 50 180 20
1
Note 4: These parameters although guaranteed, are not tested in production.
SIMPLIFIED BLOCK DIAGRAM
INPUT VOLTAGE
C1* 0.1F
VIN
LX8941
VO
C2 10F
OUTPUT VOLTAGE
Thermal Shutdown +
ADJ
E ELECTRICALS
ON / OFF
ON OFF
ON / OFF Circuit
GND
Figure 1 - Simplified Block Diagram
Copyright (c) 2001 Rev. 0.7a, 2005-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX8941
TM (R)
Adjustable Low Dropout Regulator
PRELIMINARY DATA SHEET
PACKAGE DIMENSIONS
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DD
3-Pin Plastic TO-263
A I D C
B K M N
H F G E
0 -8
J
Seating Plane
Dim A B C D E F G H I J K M N
MILLIMETERS MIN MAX 10.03 10.67 8.51 9.17 4.19 4.59 1.14 1.40 0.330 0.51 1.19 1.34 2.41 2.66 2.29 2.79 - 1.65 0 0.25 14.60 15.87 7 3
INCHES MIN MAX 0.395 0.420 0.335 0.361 0.165 0.181 0.045 0.055 0.013 0.020 0.047 0.053 0.095 0.104 0.090 0.110 - 0.065 0 0.010 0.575 0.625 7 3
P
5-Pin Plastic TO-220
B S F T
A
1
5 R
C
K D
Dim A B C D F G J K N R S T
Note:
MILLIMETERS MIN MAX 14.23 16.51 9.66 10.66 3.56 4.82 0.46 0.89 3.56 4.06 3.40 0.31 1.14 12.70 14.73 6.80 TYP 2.04 2.92 1.14 1.39 5.85 6.85
INCHES MIN MAX 0.560 0.650 0.380 0.420 0.140 0.190 0.018 0.035 0.140 0.160 0.134 0.012 0.045 0.500 0.580 0.268 TYP 0.080 0.115 0.045 0.055 0.230 0.270
M MECHANICALS
J
G N
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.
Copyright (c) 2001 Rev. 0.7a, 2005-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX8941
TM (R)
Adjustable Low Dropout Regulator
PRELIMINARY DATA SHEET
NOTES
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N 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.
Copyright (c) 2001 Rev. 0.7a, 2005-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5

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