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LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
DESCRIPTION
KEY FEATURES
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The LX8211A adjustable voltage linear regulator combines low dropout, high accuracy, very low ground current and fast response in a very small footprint. Using the Enable pin the regulator is switched on with TTL logic levels, which is especially useful for batteryoperated equipment. Other features include independent thermal and short circuit current protection. The regulator is stable with a low value ceramic output capacitor.
The PNP output transistor allows for ultra low dropout typically less than 140mV at 100mA.
Dropout Voltage Typically 140mV @ 100mA Ultra Low Shutdown Current Typically Less Than 1A High Output Accuracy Trimmed to 0.25% Standard Pinout in SOT-23-5 Current and Over Temperature Protection Stable With Low Cost Ceramic Output Capacitor APPLICATIONS Battery Operated Systems Laptop, Notebook and PDA's Cellular Telephones / Pagers Hand-Held Instruments Linear post Regulators for SMPS
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
PRODUCT HIGHLIGHT
1
ON
VIN
3
VOUT
5
R2 + VOUT = VADJ 1+ IADJ R2 R1
R1 COUT 10F
+
CIN 1F
OFF
ENABLE
Part
ADJUST GND
4
CBYP 470pF
LX8211A
2
R2
CBYP Optional for low noise
TJ (C) -40 to 125
PACKAGE ORDER INFO Plastic SOT-23 SE 5-PIN OUTPUT VOLTAGE
RoHS Compliant / Pb-free
LX8211A LX8211A
PACKAGE MARKING E2C
Adjustable
LX8211A-00ISE
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX8211A-25ISE-TR)
Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS Input Voltage (VIN) ...................................................................................... -0.3V to +15V Enable Input ........................................................................................-0.3V to VIN + 0.3V Output Current (IOUT) ............................................................................................. 150mA Maximum Junction Temperature (TJ) ....................................................................... 150C Peak Package Solder Reflow Temperature (40 second max. 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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1 2 3
SE PACKAGE
(Top View)
5
4
RoHS / Pb-free 100% Matte Tin Lead Finish
THERMAL DATA
SE
5-PIN SOT-23 PACKAGE
Two - Layer Board Four - Layer Board
Thermal Resistance - Junction to Ambient, JA 220C/W 220C/W
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. FUNCTIONAL PIN DESCRIPTION PIN NAME VIN GND ENABLE ADJUST VOUT PIN NUMBER 1 2 3 4 5 Unregulated Input Supply Voltage Ground Pin Enable Control Input, Enable High Adjust Control Input for Resistor Divider Network. Regulated Output Voltage. Regulator stability is achieved with an external capacitor of 10F. DESCRIPTION
PACKAGE DATA PACKAGE DATA
Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
RECOMMENDED OPERATING CONDITIONS Parameter Input Operating Voltage Range (Note 1) Minimum Output Voltage Enable Input Voltage Range Continuous Output Current Range Operating Temperature Range Input Capacitor (VIN to GND) Output Capacitor (VOUT to GND) Symbol
VIN ENABLE
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Min
3.0 2.3 0 0.1
LX8211A Typ
Max
13.0 VIN
Units
V V
IOUT TJ CIN COUT
-40 1.0 10
150 125 1.0*
mA
C F F
Note 1: The minimum VIN has to meet two conditions VIN > 3.0V and VIN > VOUT + VDROPOUT. * Size your output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR and larger value capacitor will improve the response to these load steps.
ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature -40C TJ 125C except where noted. Test conditions: VIN = VOUT+1V, VOUT = 2.9V; IOUT = 10mA; CIN = 1F; COUT = 10F; TJ = TA, using low duty cycle pulse testing methods.
Parameter Symbol Test Conditions Min Adjust Reference Voltage VADJ Note 3 1.225 LX8211A Typ 1.25 Max 1.275 V Units
V Line Regulation O VIN V Load Regulation O IO
VRV VRI
VIN = VOUT + 1.0 TO 13 Volts, IOUT=0.1mA TJ = 25C, IOUT: 0.5 TO 150mA IOUT: 0.5 TO 150mA ILOAD = 10mA, VO = -1% ILOAD = 50mA, VO = -1% ILOAD = 100mA, VO = -1%
ILOAD = 150mA, VO = -1% Enable = Hi, IOUT = 100mA
0.04 0.05
0.1 0.2 0.5 0.1
%/V %VNOM %VNOM V V V
V A A A nA A V
Dropout Voltage (VIN - VO )
(Note2)
VDO
0.12 0.175
0.25 600 1300
0.23 0.3
0.35 1500 2500 5
Ground Pin Current
IGND
Enable = Hi, IOUT = 150mA Enable = Low (Standby)
Adjust Input Bias Current Enable Pin Current Enable Threshold Short Circuit Current Limit Power Supply Rejection Ratio Output Noise Thermal Shutdown Temperature
IADJ IEN VIH VIL IOUTSC
PSRR
Current Flows Out of Pin 4 VEN = VIN 2.0
50
500 25
ELECTRICALS ELECTRICALS
0.18 VOUT = 0V TJ = 25C, f = 120Hz TJ = 25C, COUT = 10F 400 75 260 170
V mA dB nv /Hz C
eN TSD
Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 1% below the nominal value. Note 3: Limits require operation within recommended operating conditions. Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
BLOCK DIAGRAM
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VIN
Thermal Shutdown
VOUT
Current Limit
ENABLE
Control Logic
ADJUST
VREF
GND
+ LX8211A
Figure 1 - Simplified Adjustable Version Block Diagram
BLOCK DIAGRAM BLOCK DIAGRAM
Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
TYPICAL CHARACTERISTICS Typical performance characteristics, unless otherwise specified are: CIN = 1F, COUT = 10F, CBY = 470pF, VIN = 4V, VOUT = 2.9V, TA = 25C, ENABLE is tied to VIN. VOUT (Programmed to 2.9V) vs. TEMPERATURE V ADJUST vs. TEMPERATURE
1.252
V ADJUST, Volts 2.915 2.91 2.905 2.9 2.895 2.89 2.885 2.88 -50 -25 0 25 50 75 100 125 150
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1.25 V ADJUST, Volts 1.248 1.246 1.244 1.242 1.24 1.238 -50 -25 0 25 50 75 100 125 150
TEMPERATURE, C
TEMPERATURE, C
DROPOUT VOLTAGE (Vin=3.9V)
300 DROPOUT VOLTAGE, mV 250 200 150 100 50 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE, C 150mA 100mA 10mA
CURRENT, mA 550 525 500 475 450 425 400 375 350 325 300 -50
SHORT CIRCUIT CURRENT vs. TEMP and VIN
VIN=13V VIN=3.9V
-25
0
25
50
75
100
125
150
TEMPERATURE, C
GROUND CURRENT vs IOUT (Vin=3.9V)
2.25 2.00 1.75 CURRENT, mA 1.50 1.25 1.00 0.75 0.50 0.25 0 -50 -25 0 25 50 75 100 125 150 TEMPERATURE, C 150mA 100mA 10mA
LINE and LOAD REGULATION
0.30 0.25 VOUT, % CHANGE 0.20 0.15 LINE (3.9-13v) 0.10 0.05 0.00 -50 -25 0 25 50 75 100 125 150 LOAD(0.5MA-150MA)
CHARTS CHARTS
TEMPERATURE, C
Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
TYPICAL CHARACTERISTICS (CONTINUED) Typical performance characteristics, unless otherwise specified are: CIN = 1F, COUT = 10F, CBY = 470pF, VIN = 4V, VOUT = 2.9V, TA = 25C, ENABLE is tied to VIN. Power Supply Rejection vs. Frequency
10MA LOAD CBYPASS = 470PF
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 100 1K 10K 100K
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Enable Response
VIN = 4V, CIN = 1F, COUT = 10F, CBYP = 470pF, IOUT = 100mA. CH2 = VOUT = 2.9V. CH1 - VENABLE
Line Regulation Step Response
VIN = 4V, CIN = 1F, COUT = 10F, CBYP = 470pF, IOUT = 100mA. CH2 = VOUT = 2.9V. CH1 = VIN from 3.5V to 4.5V
Load Transient Response
VIN = 4V, CIN = 1F, COUT = 10F, CBYP = 470pF, IOUT = 50mA. CH2 = VOUT = 2.9V. CH4 = ISTEP = 20mA to 70mA
Load Transient Response
VIN = 4V, CIN = 1F, COUT = 10F, CBYP = 470pF, STEP Load = 100mA. CH2 = VOUT = 2.9V. CH4 = ISTEP = 20mA to 100mA
CHARTS CHARTS
Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
APPLICATION INFORMATION
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Description
The LX8211A is a family of LDO (Low Dropout) linear regulators in a small SOT-23 Package, which provides a compact and cost effective solution. The family includes several fixed output voltages, along with an adjustable version. The internal PNP power device provides low dropout regulation with fast line and load transient response. It also includes internal current limit and thermal shutdown circuitry. This section contains information about the selection of external capacitors, thermal, and layout consideration.
Minimum Load Requirement
The LX8211A is stable even at zero load; no minimum load is required for operation, which is especially important in keep-alive applications. However line regulation is improved with a minimum load of 100A.
Temperature Protection
Thermal protection shuts the LX8211A down when the junction temperature exceeds approximately 150C; there is no appreciable thermal hysteresis.
Input Capacitor
To improve load transient response and noise rejection a bypass capacitor is recommended, but it is not required for stability. There are no requirements for the ESR (Equivalent Series Resistor) on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitor will be around 1F over the entire operating temperature range. For the LX8211A connect a ceramic type capacitor (1F) between VIN and ground.
Short Circuit Current Protection
The LX8211A includes over current protection, when the output load current exceeds typically 400mA the circuit forces the regulator to decrease in output.
Thermal Consideration
Thermal shutdown protects the integrated circuit from thermal overload caused from a rise in junction temperature during power dissipation. This means of protection is intended for fault protection only and not as a means of current or power limiting during normal application usage. Proper thermal evaluation should be done to ensure that the junction temperature does not exceed its maximum rating. Operating at the maximum TJ of 150C can impact reliability. Due to variation in individual device electrical characteristics and thermal resistance, the built in thermal overload protection may be activated at power levels slightly above or below the rated dissipation. Power dissipation for regulator can be calculated using the following equation:
Output Capacitor
To maintain a constant output voltage a feedback loop is necessary. The feedback loop causes a well known a phase shift, the amount of phase shift determines the loop stability. Therefore the LX8211A, like any low dropout regulator, requires an output capacitor with low ESR (Equivalent Series Resistor) connected between VOUT and GND to stabilize the internal control loop. For the LX8211A a ceramic, tantalum, or electrolytic capacitor with the minimum recommended capacitance value at 10F with ESR between 5m and 1 will satisfy the stability for whole operating range.
PD = (VIN(MAX)-VOUT(MIN)) * IOUT(MAX)
(Note: power dissipation resulting from quiescent current is negligible)
Adjustable Output Voltage
The LX8211A-00 adjustable regulator's output voltage can be externally set by connecting the ADJ pin to an external resistor divider (See Figure 1). The output voltage can be calculated using:
VOUT = 1.251 +

For the SOT23 package, thermal resistance, JA is 220C/W when mounted on a FR4 copper clad PCB. Junction temperature of the integrated circuit can be calculated using:
R2 + [I * R2] R1 ADJ
TJ = TA + TRISE, substituting: TA + (PD * JA).
An example: Given conditions: TA = 60C, VIN= 4.2V, VOUT= 2.7V, IOUT= 100mA. Calculated values: Total Power dissipation PD(total) = (4.2-2.7) V * 0.1A =0.15W Junction Temperature
Enable
The Enable pin allows the LX8211A to be turned on and off. The Enable pin is compatible with standard TTL-CMOS levels. A logic zero (0.4V) on the Enable pin shuts the LX8211A off and reduces the supply current to less than 1A. Pulling the Enable input high (2.0V) causes normal operation to resume. If the Enable feature is not used, this pin can be connected to VIN.
TJ = 60C +(0.15W *220C/W) = 93C
APPLICATION APPLICATION
Layout Consideration:
The layout must be done with low impedance paths for VIN, VOUT, and Ground by applying sufficient wide traces to avoid voltage drops and pick up noise. Adding an area of PCB copper to the GND pin (pin2) will reduce the overall JA since it is thermally connected to the device substrate. This will lower the device junction temperature improving the overall output accuracy. The input / output capacitors must be placed as close as possible to the voltage regulator output pin. To allow the same voltage reference for all circuits, use a star configuration from the output capacitor to the different loads.
Page 7
Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
PACKAGE DIMENSION
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SE
5 Pin Plastic SOT-23
D G
Dim A A1 B C D E F G H I J K
Note:
H
E
A1
A C B K
MILLIMETERS MIN MAX 0.90 1.30 0.90 1.45 0.25 0.50 0.09 0.20 2.80 3.10 1.50 1.75 0.95 BSC 1.90 BSC 2.60 3.00 0.35 0.55 0.00 0.15 10 MAX
INCHES MIN MAX 0.035 0.051 0.035 0.057 0.010 0.020 0.004 0.008 0.110 0.122 0.059 0.069 0.038 BSC 0.075 BSC 0.102 0.118 0.014 0.022 0.000 0.006 10 MAX
F
J
I
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.
MECHANICALS MECHANICALS
Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX8211A
TM (R)
150mA Low Dropout Regulator
PRODUCTION DATA SHEET
NOTES
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NOTES NOTES
PRODUCTION DATA - Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Copyright (c) 2006 Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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