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LX8211
TM (R)
150mA CMOS Low Dropout Regulator
PRODUCTION DATA SHEET
DESCRIPTION
KEY FEATURES
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The LX8211 fixed/adjustable voltage linear regulators combines low dropout, high accuracy, ultra-low ground current and fast response in a very small footprint. Using the Enable pin the regulators 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 capacitors.
For ultra low noise operation a Bypass pin is brought out to connect an optional capacitor. Significant performance improvements over Bipolar technology are achieved designing in CMOS: increased regulator efficiency by minimizing operating ground current (typ<140uA) and it is nearly eliminated (typ<1uA) in shutdown. The PMOS output transistor allows for ultra low dropout typically less than 300mV at 100mA.
Dropout Voltage typically 175mV @ 100mA Ultra low shutdown Current typically less than 1uA High Output accuracy trimmed to 0.25% Standard pinout in SOT-23-5 Noise Bypass feature available 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
CIN 1F +
ON
VIN ENABLE
OFF
VOUT CBY/ADJUST GND COUT 1F 470pF
Optional
TJ (C) -40 to 125 -40 to 125 -40 to 125 -40 to 125 -40 to 125 -40 to 125
PACKAGE ORDER INFO Plastic SOT-23 SE 5-PIN OUTPUT VOLTAGE
RoHS Compliant / Pb-free Transition DC: 0503
PACKAGE MARKING 82A1 82B1 82D1 82E1 82G1 82K1
Adjustable 2.5V 2.7V 2.8V 3.0V 3.3V
LX8211-00ISE LX8211-25ISE LX8211-27ISE LX8211-28ISE LX8211-30ISE LX8211-33ISE
LX8211 LX8211
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX8211-25ISE-TR)
Copyright (c) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX8211
TM (R)
150mA CMOS Low Dropout Regulator
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS Input Voltage (VIN) ........................................................................................ -0.3V to +7V Enable Input ........................................................................................... -0.3V to VIN+.3V Output Current (IOUT) ............................................................................................. 150mA Operating Temperature Range .....................................................................-40 to +125 C Maximum Junction Temperature (TJ) ...................................................................... 150 C RoHS Compliant / Pb-free 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 Pin 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 CBY/ADJUST VOUT PIN NUMBER 1 2 3 4 5 Unregulated input supply voltage Ground Pin Enable Control Input, Enable High Reference bypass input. Adding an additional external capacitor reduces output noise . Or adjust control input for LX8211-00. Regulated output voltage. Regulator stability is achieved with external capacitor of 1uF APPLICATION
1
DESCRIPTION
VIN
ON 3
5
VOUT
PACKAGE DATA PACKAGE DATA
+ CIN
OFF
ENABLE CBY/ADJUST GND
2 4
R1
COUT
R1 VOUT = VADJ 1 + R2
R2
Figure 1 - Output Voltage Set Externally
Copyright (c) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX8211
TM (R)
150mA CMOS Low Dropout Regulator
PRODUCTION DATA SHEET
RECOMMENDED OPERATING CONDITIONS Parameter Input Operating Voltage Range (Note 1) Enable Input Voltage Range Continuous Output Current Range Input Capacitor (VIN to GND) Output Capacitor (VOUT to GND) Symbol
VIN ENABLE
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Min
2.5 0 .1
LX8211-xx Typ
Max
6 VIN + .3V
Units
V mA
IOUT CIN COUT
150 1.0* 2.2*
1.0 1.0
F F
Note 1: The minimum VIN has to meet two conditions VIN>2.5V 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 TA 125C except where otherwise noted. Test conditions: VIN = VOUT + 0.5V; IOUT =10mA; CIN = 1uF; COUT = 1uF; TJ=TA using low duty cycle pulse testing methods. Parameter Symbol TJ = 25C IOUT = 0mA to 150mA, VIN = VOUT + .5V to 6V TJ = 25C IOUT = 0mA to 150mA, VIN = 2.85V to 6V VIN: VOUT + 0.5 TO 6 VOLTS, IOUT=0.1mA TJ = 25C, IOUT: 0.5 TO 150mA IOUT: 0.5 TO 150mA ILOAD = 1mA, VO = -1% Dropout Voltage (VIN - VO ) (Note2) VDO ILOAD = 50mA, VO = -1% ILOAD = 100mA, VO = -1% ILOAD = 150mA, VO = -1% Ground Pin Current Adjust Input Bias Current Enable Pin Current Enable Threshold Short Circuit Current Limit Power Supply Rejection Ratio Output Noise Thermal Shutdown Temperature IGND ISTBY IADJ IEN VIH VIL IOUTSC
PSRR
Test Conditions Min -1 -2.5
LX8211-XX Typ Max 1 2.5 1.175 0.04 0.5 1.187 1.20 0.15 1.0 1.5 0.05 0.1 0.175 0.25 140 0.175 0.3 0.4 220 1 100 100 2.0 0.4
Units %VNOM %VNOM V %/V %VNOM %VNOM V V V V A A nA nA V V mA dB V C
Output Voltage (-25, -27, -28, -30, -33) Adjust Reference Voltage (-00) Line Regulation
VO VADJ VRV VRI
1.163 1.14
VO VIN VO I O
Load Regulation
Enable = Hi Enable = Low VADJ = 1.175V VEN = VIN
ELECTRICALS ELECTRICALS
VOUT = 0V TJ = 25C, f = 120Hz TJ = 25C, COUT = 10uF,CBYPASS = 470 pF
400 50 50 170
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.
Copyright (c) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX8211
TM (R)
150mA CMOS Low Dropout Regulator
PRODUCTION DATA SHEET
BLOCK DIAGRAM
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VIN
Thermal Shutdown RA
VOUT
Current Limit
ENABLE
Control Logic
+ RB VREF
CBY/ADJUST
GND
Figure 2 - Simplified Fixed Version Block Diagram (LX8211-25 / 27 / 28/ 30/ 33ISE)
VIN
Thermal Shutdown
VOUT
Current Limit
+
ENABLE
Control Logic
CBY/ADJUST
-
BLOCK DIAGRAM BLOCK DIAGRAM
VREF
GND
Figure 3 - Simplified Adjustable Version Block Diagram (LX8211-00ISE)
Copyright (c) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX8211
TM (R)
150mA CMOS Low Dropout Regulator
PRODUCTION DATA SHEET
APPLICATION INFORMATION
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Description
The LX8211 is a family of LDO (Low Drop-Out) 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 PMOS power device provides low dropout regulation with fast line and load transient response. It also includes internal current limit and thermal shutdown circuitry. In this section you will find information about selection of external capacitors, thermal and layout consideration.
Minimum Load Requirement
The LX8211 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 100uA.
Temperature Protection
The thermal protection shuts the LX8211 down when the junction temperature exceeds approximately 1500C, 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 1uF over the entire operating temperature range. For LX8211 connect ceramic type capacitor (1uF) between VIN and ground.
Short Circuit Current Protection
The LX8211 includes over current protection, when the output load current exceeds typically 400mA the circuit forces the regulator 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 dose not exceed it's 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, LX8211 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 LX8211 a ceramic, tantalum or electrolytic capacitor with the minimum recommended capacitance value at 1.0 uF with ESR between 5m and 1 will satisfy the stability for whole operating range.
Bypass Capacitor (Optional) / Adjustable Output Voltage
The LX8211 includes the extra Bypass pin to help further reduce the already low output noise in the regulator. If the output noise requirement meets the specification, omit the bypass capacitor, that's because the capacitor impacts the start up time which is inversely proportional to the size of bypass capacitor. The bypass capacitor reduces the regulator phase margin, therefore it requires a larger output capacitor to maintain stability. The LX8211-00 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:
R1 VOUT = VADJ 1 + R2
PD = (VIN(MAX)-VOUT(MIN)) * IOUT(MAX)
(Note: power dissipation resulting from quiescent current is negligible)
For the SOT23 package, thermal resistance, JA is 2200C/W when mounted on a FR4 copper clad PCB. Junction temperature of the integrated circuit can be calculated using:
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
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.
Enable
The Enable pin allows the LX8211 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 LX8211 off and reduces the supply current to less than 1uA. 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.
Copyright (c) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX8211
TM (R)
150mA CMOS Low Dropout Regulator
PRODUCTION DATA SHEET
TYPICAL CHARACTERISTICS Typical performance characteristics, unless otherwise specified are: CIN = COUT = 1F, CBY = 470pF, VIN = VOUT + 0.5V, IOUT = 10mA, TA = 25C, ENABLE is tied to VIN.
V A D J V O LT A G E v s T E M P E R A T UR E
1.185 2.525 2.52 1.18 2.515
OUTPUT VOLTAGE (V)
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O UT P UT V O LT A G E v s T E M P E R A T UR E
OUTPUT VOLTAGE (V)
1.175
2.51 2.505 2.5 2.495 2.49 2.485 2.48
1.17
1.165
1.16
1.155 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
2.475 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
D R O P O UT V O LT A G E v s T E M P E R A T UR E
350 325 300 275
DROPOUT (mV)
S H O R T C IR C UIT C UR R E N T v s T E M P E R A T UR E v s S UP P LY V O LT A G E
-340 -350 -360
250 225 200 175 150 125 100 75 50 - 50 - 25 0 25 50 75 100 125
IL =150mA
CURRENT (mA)
-370 -380 -390 -400
V I N =5V V I N =4V V I N =3V
-50 -25 0 25 50 75 100 125
IL =100mA
-410 -420 -430
TEMPERATURE (C)
TEMPERATURE (C)
G R O UN D C UR R E N T v s S UP P LY V O LT A G E
0
POWER SUPPLY / RIPPLE REJECTION vs FREQUENCY DROPUT REGION
0dB
-50
CURRENT
-100
-40
PSSR
-150
25 85
50dB
C CHARTS
-200
115
-250 2.8 3.3 3.8 4.3 4.8 5.3 5.8 6.3
100dB 0.1
SUPPLY VOLTAGE (V)
Frequency (kHz)
100
Copyright (c) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX8211
TM (R)
150mA CMOS Low Dropout Regulator
PRODUCTION DATA SHEET
TYPICAL CHARACTERISTICS (CONTINUED)
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POWER SUPPLY RIPPLE REJECTION VS. FREQUENCY
0dB CBYPASS = 0pF
POWER SUPPLY / RIPPLE REJECTION VS. FREQUENCY
0dB CBYPASS = 470pF
PSSR
50dB
PSSR Frequency (kHz)
50dB
100dB 0.1 100
100dB 0.1
Frequency (kHz)
100
ENABLE RESPONSE VIN = 3.3V CIN = 1F, COUT = 22F, CBVP = 470pF, IOUT = 100mA
VOUT = 2.5V 1V / DIV
LOAD TRANSIENT RESPONSE VIN = 3.3V, CIN = 1F, COUT = 2.2F, STEP Load = 50mA
VIN 50mV / DIV
50mV / DIV
VOUT = 2.5V
VENABLE
5V / DIV
50mA / DIV
ISTEP = 50mA
100s / DIV
20s / DIV
LINE REGULATION STEP RESPONSE CIN = 1F, COUT = 22F, CBVP = 470pF, IOUT = 100mA
LOAD TRANSIENT RESPONSE VIN = 3.3V, CIN = 1F, COUT = 2.2F, STEP Load = 100mA
10mV / DIV
VOUT = 2.5V
50mV / DIV
VOUT = 2.5V
CHARTS CHARTS
VIN 3.75V
2.75V
100m A/ DIV ISTEP = 100mA
20s / DIV
20s / DIV
Copyright (c) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX8211
TM (R)
150mA CMOS Low Dropout Regulator
PRODUCTION DATA SHEET
PACKAGE DIMENSION
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SE
5 Pin Plastic SOT-23
Dim A A1 B C D E F G H I J K
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.
D G
H
E
A1
A C
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
B
F
J
I
K
MECHANICALS MECHANICALS
Copyright (c) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX8211
TM (R)
150mA CMOS 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) 2000 Rev. 1.0d, 2007-08-29
Microsemi
Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9

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