ICGOO在线商城 > 集成电路(IC) > PMIC - 稳压器 - 线性 > MIC49150-1.5YMM
数量阶梯 | 香港交货 | 国内含税 |
+xxxx | $xxxx | ¥xxxx |
查看当月历史价格
查看今年历史价格
MIC49150-1.5YMM产品简介:
ICGOO电子元器件商城为您提供MIC49150-1.5YMM由Micrel设计生产,在icgoo商城现货销售,并且可以通过原厂、代理商等渠道进行代购。 MIC49150-1.5YMM价格参考。MicrelMIC49150-1.5YMM封装/规格:PMIC - 稳压器 - 线性, Linear Voltage Regulator IC Positive Fixed 1 Output 1.5V 1.5A 8-MSOP。您可以下载MIC49150-1.5YMM参考资料、Datasheet数据手册功能说明书,资料中有MIC49150-1.5YMM 详细功能的应用电路图电压和使用方法及教程。
参数 | 数值 |
产品目录 | 集成电路 (IC)半导体 |
描述 | IC REG LDO 1.5V 1.5A 8MSOP低压差稳压器 Dual Supply, LV 1.5A LDO(Lead Free) |
产品分类 | |
品牌 | Micrel |
产品手册 | |
产品图片 | |
rohs | 符合RoHS无铅 / 符合限制有害物质指令(RoHS)规范要求 |
产品系列 | 电源管理 IC,低压差稳压器,Micrel MIC49150-1.5YMM- |
数据手册 | |
产品型号 | MIC49150-1.5YMM |
产品目录页面 | |
产品种类 | 低压差稳压器 |
供应商器件封装 | 8-MSOP |
其它名称 | 576-1806-5 |
包装 | 管件 |
商标 | Micrel |
回动电压—最大值 | 500 mV |
安装类型 | 表面贴装 |
安装风格 | SMD/SMT |
封装 | Tube |
封装/外壳 | 8-TSSOP,8-MSOP(0.118",3.00mm 宽) |
封装/箱体 | MSOP-8 |
工作温度 | -40°C ~ 125°C |
工厂包装数量 | 100 |
最大工作温度 | + 125 C |
最大输入电压 | 6.5 V |
最小工作温度 | - 40 C |
最小输入电压 | 1.4 V |
标准包装 | 100 |
电压-跌落(典型值) | 0.28V @ 1.5A |
电压-输入 | 最高 6.5V |
电压-输出 | 1.5V |
电流-输出 | 1.5A |
电流-限制(最小值) | 1.6A |
稳压器拓扑 | 正,固定式 |
稳压器数 | 1 |
系列 | MIC49150 |
线路调整率 | 0.01 % / V |
负载调节 | 0.2 % |
输出电压 | 1.5 V |
输出电流 | 1.5 A |
输出端数量 | 1 Output |
输出类型 | Fixed |
MIC49150 1.5A Low Voltage LDO Regulator w/Dual Input Voltages General Description Features The MIC49150 is a high-bandwidth, low-dropout, 1.5A volt- • Input Voltage Range: age regulator ideal for powering core voltages of low- – V : 1.4V to 6.5V IN power microprocessors. The MIC49150 implements a dual – V : 3.0V to 6.5V supply configuration allowing for very low output BIAS • Stable with 1µF ceramic capacitor impedance and very fast transient response. • ±1% initial tolerance The MIC49150 requires a bias input supply and a main input supply, allowing for ultra-low input voltages on the • Maximum dropout voltage (VIN–VOUT) of 500mV main supply rail. The input supply operates from 1.4V to over temperature 6.5V and the bias supply requires between 3V and 6.5V • Adjustable output voltage down to 0.9V for proper operation. The MIC49150 offers fixed output • Ultra fast transient response (Up to 10MHz bandwidth) voltages from 0.9V to 1.8V and adjustable output voltages • Excellent line and load regulation specifications down to 0.9V. • Logic controlled shutdown option The MIC49150 requires a minimum of output capacitance for stability, working optimally with small ceramic • Thermal shutdown and current limit protection capacitors. • Power MSOP-8 and S-Pak packages The MIC49150 is available in an 8-pin power MSOP pack- • Junction temperature range: –40°C to 125°C age and a 5-pin S-Pak. Its operating temperature range is –40°C to +125°C. Applications Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. • Graphics processors • PC add-in cards • Microprocessor core voltage supply • Low voltage digital ICs • High efficiency linear power supplies • SMPS post regulators Typical Application MIC49150BR V = 1.8V V = 1.0V IN OUT IN OUT R1 VBIAS= 3.3V BIAS ADJ R2 COUT= 1µF CBIAS= 1µF GND Ceramic Ceramic C = 1µF IN Ceramic Low Voltage, Fast Transient Response Regulator Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com November 2006 1 M9999-111306
Micrel, Inc. MIC49150 Ordering Information Part Number Output Junction Voltage Package Standard Pb-Free / Current Temp. Range RoHS Compliant MIC49150-0.9BMM MIC49150-0.9YMM 1.5A 0.9V –40° to +125°C 8-Pin Power MSOP MIC49150-1.2BMM MIC49150-1.2YMM 1.5A 1.2V –40° to +125°C 8-Pin Power MSOP MIC49150-1.5BMM MIC49150-1.5YMM 1.5A 1.5V –40° to +125°C 8-Pin Power MSOP MIC49150-1.8BMM MIC49150-1.8YMM 1.5A 1.8V –40° to +125°C 8-Pin Power MSOP MIC49150BMM MIC49150YMM 1.5A Adj. –40° to +125°C 8-Pin Power MSOP MIC49150-0.9BR MIC49150-0.9WR* 1.5A 0.9V –40° to +125°C 5-Pin S-PAK MIC49150-1.2BR MIC49150-1.2WR* 1.5A 1.2V –40° to +125°C 5-Pin S-PAK MIC49150-1.5BR MIC49150-1.5WR* 1.5A 1.5V –40° to +125°C 5-Pin S-PAK MIC49150-1.8BR MIC49150-1.8WR* 1.5A 1.8V –40° to +125°C 5-Pin S-PAK MIC49150BR MIC49150WR* 1.5A Adj. –40° to +125°C 5-Pin S-PAK * RoHS Compliant with ‘high-melting solder’ exemption. Pin Configuration EN/ADJ. 1 8 GND 5 VOUT 4 VIN VBIAS 2 7 GND AB 3 GND T VIN 3 6 GND 2 VBIAS 1 EN/ADJ. VOUT 4 5 GND 8-Pin Power MSPO (MM) 5-Pin S-Pak (R) Pin Description Pin Number Pin Number Pin Name Pin Name 8-MSOP 5-SPak 1 1 EN Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. ADJ Adjustable regulator feedback input. Connect to resistor voltage divider. 2 2 VBIAS Input Bias Voltage for powering all circuitry on the regulator with the exception of the output power device. 3 4 VIN Input voltage which supplies current to the output power device. 4 5 OUT Regulator Output. 5/6/7/8 3 GND Ground (TAB is connected to ground on S-Pak). November 2006 2 M9999-111306
Micrel, Inc. MIC49150 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (V ).........................................................8V Supply Voltage (V ).........................................1.4V to 6.5V IN IN Bias Supply Voltage (V )..............................................8V Bias Supply Voltage (V ).................................3V to 6.5V BIAS BIAS Enable Input Voltage (V )...............................................8V Enable Input Voltage (V )..................................0V to 6.5V EN EN Power Dissipation.....................................Internally Limited Junction Temperature (T )..................–40°C ≤ T ≤ +125°C J J ESD Rating(3)..................................................................4kV Package Thermal Resistance MSOP-8 (θ ).....................................................80°C/W JA S-Pak (θ )..........................................................2°C/W JC Electrical Characteristics(4) T = 25°C with V = V + 2.1V; V = V + 1V; bold values indicate –40°C< T < +125°C, unless noted(5). A BIAS OUT IN OUT J Parameter Condition Min Typ Max Units Output Voltage Accuracy At 25°C –1 +1 % Over temperature range –2 +2 % Line Regulation V = V +1V to 6.5V –0.1 0.01 +0.1 %/V IN OUT Load Regulation I = 0mA to 1.5A 0.2 1 % L 1.5 % Dropout Voltage (V - V ) I = 750mA 130 200 mV IN OUT L 300 mV I = 1.5A 280 400 mV L 500 mV Dropout Voltage (V - V ), I = 750mA 1.3 V BIAS OUT L Note 5 I = 1.5A 1.65 1.9 V L 2.1 V Ground Pin Current, Note 6 I = 0mA 15 mA L I = 1.5A 15 25 mA L 30 mA Ground Pin Current in V ≤ 0.6V, (I + I ), Note 7 0.5 1 µA EN BIAS CC Shutdown 2 µA Current thru V I = 0mA 9 15 mA BIAS L 25 mA I = 1.5A 32 mA L Current Limit MIC49150 1.6 2.3 3.4 A 4 A Enable Input (Note 7) Enable Input Threshold Regulator enable 1.6 V (Fixed Voltage only) Regulator shutdown 0.6 V Enable Pin Input Current Independent of state 0.1 1 µA Reference Reference Voltage 0.891 0.9 0.909 V 0.882 0.918 V Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. 5. For V ≤1V, V dropout specification does not apply due to a minimum 3V V input. OUT BIAS BIAS 6. I = I + (I – I ). At high loads, input current on V will be less than the output current, due to drive current being supplied by V . GND BIAS IN OUT IN BIAS 7. Fixed output voltage versions only. November 2006 3 M9999-111306
Micrel, Inc. MIC49150 Typical Characteristics PowerSupplyRejectionRatio PowerSupplyRejectionRatio DropoutVoltage (InputSuppl ) (BiasSuppl ) (InputSuppl ) 80 80 300 70 70 mV)250 60 60 E ( G200 B)50 B)50 TA RR (d40 VBIAS=3.3V RR (d40 VBIAS=3.3V T VOL150 PS30 VIN=1.8V PS30 VIN=1.8V OU100 20 VOUT=1.0V 20 VOUT=1.0V OP V =5V I =1.5A I =1.5A R 50 BIAS 10 COUT =1µFceramic 10 COUT =1µFceramic D VOUT=1.0V OUT OUT 0 0 0 0 0 0 0 0 0 0 0 0 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 20 40 60 80 00 20 40 60 FREQUENCY (kHz) FREQUENCY (kHz) OUTPUT CURR1ENT1 (mA1) 1 DropoutVoltage DropoutVoltage DropoutVoltage (BiasSupply) vs. Temperature vs. Temperature 1.8 (InputSupply) (BiasSupply) 1.6 400 2.0 DROPOUT VOLTAGE (V)0000111.......02468024 VVIONU=T=2.51V.5V DROPOUT VOLTAGE (mV)11223305050550000000 VIVOBOUIUATTS===115.5.V5AV DROPOUT VOLTAGE (V)000011111.........246802468 VIVOIOUNUT=T==21.51.5V.5AV 0 200 400 600 800 000 200 400 600 0-40-20 0 20 40 60 80 100120 0-40-20 0 20 40 60 80 100120 OUTPUT CURR1ENT1 (mA1) 1 TEMPERATURE(°C) TEMPERATURE(°C) DropoutCharacteristics DropoutCharacteristics LoadRegulation (InputVoltage) (BiasVoltage) 1.505 1.6 1.6 1.504 GE (V)11..24 IOUT=10mA GE (V)11..24 IOUT=10mA TAGE (V)111...555000123 UT VOLTA001...680 IOUT=1.5A UT VOLTA001...680 IOUT=1.5A TPUT VOL111...445990890 TP0.4 TP0.4 OU1.497 VBIAS=5V OU0.20 VVBOIUATS==15.V5V OU0.20 VVIONU=T=2.51V.5V 11..4499560 00 00 00 00 00VIN00=2.500V 00 0 0.I5NPUT1 VOLT1A.5GE (V2) 2.5 0 1 BIA2S VO3LTA4GE (5V) 6 7 2OUT4PU6T CU8RR10ENT12 (mA14) 16 MaximumBiasCurrent MaximumBiasCurrent BiasCurrent vs.BiasVoltage vs. Temperature vs. Temperature 300 300 45 V =2.5V 40 IN RRENT (mA)122505000 VIVOAIUNDT=J==21.05.5VVA RRENT (mA)122505000 VVBAIDAJS==05VV RRENT (mA)22330505 IOUT=750mA IOUVVTOBI=UATS1=5=0150.V5mVA U U V =2.5V U I =100mA S C100 S C100 IN S C15 OUT BIA 50 BIA 50 BIA10 *cNurorteen:tMwaitxhiminupmutbiniadsrcouproreutntisbias 5 IOUT=10mA 0 0 0 3 3.5 4 4.5 5 5.5 6 6.5 -40-20 0 20 40 60 80 100120 -40-20 0 20 40 60 80 100120 BIAS VOLTAGE (V) TEMPERATURE(°C) TEMPERATURE(°C) November 2006 4 M9999-111306
Micrel, Inc. MIC49150 Typical Characteristics (cont.) BiasCurrent GroundCurrent BiasCurrent vs.OutputCurrent vs.BiasVoltage vs.BiasVoltage 50 14 14 V =5V BIAS I 40 VIN=2.5V A)12 A)12 BIAS V =1.5V m m RRENT (mA)2300 IBIAS OUT CURRENT (1680 CURRENT (1680 CU10 GROUND 24 IVVOIOUNUT=T==20.51mV.5AV GROUND 24 IVVOIOUNUT=T==21.510V.05mVA 0 0 0 0 0 0 0 0 0 0 0 0 20 40 60 80 00 20 40 60 3 3.5 4 4.5 5 5.5 6 6.5 3 3.5 4 4.5 5 5.5 6 6.5 OUTPUT CURR1ENT1 (mA1) 1 BIAS VOLTAGE (V) BIAS VOLTAGE (V) BiasCurrent BiasCurrent BiasCurrent vs.BiasVoltage vs.BiasVoltage vs.InputVoltage 50 50 20 UND CURRENT (mA)234000 IBIAS IVVOIOUNUT=T==27.515V.05mVA UND CURRENT (mA)234000 IBIAS IOUT=1500mA AS CURRENT (mA)111116802468 VVBOIUATS==15.V5V IOUIOTU=T1=000mmAA RO10 RO10 VIN=2.5V BI 4 G G VOUT=1.5V 2 0 0 0 3 3.5 4 4.5 5 5.5 6 6.5 3 3.5 4 4.5 5 5.5 6 6.5 0 0.5 1 1.5 2 2.5 BIAS VOLTAGE (V) BIAS VOLTAGE (V) INPUT VOLTAGE (V) BiasCurrent ReferenceVoltage ReferenceVoltage vs.InputVoltage vs.InputVoltage vs.BiasVoltage 300 0.901 0.901 VBIAS=5V 1500mA V) V) mA)250 VOUT=1.5V GE ( VBIAS=5V GE ( VIN=2.5V RRENT (125000 750mA E VOLTA0.900 E VOLTA0.900 U C C BIAS C10500 EFEREN EFEREN R R 0 0.899 0.899 0 0.5 1 1.5 2 2.5 1.4 2.4 3.4 4.4 5.4 6.4 3 3.5 4 4.5 5 5.5 6 6.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) BIAS VOLTAGE (V) OutputVoltage ShortCircuitCurrent EnableThreshold vs. Temperature vs. Temperature vs.BiasVoltage 1.55 3.0 1.6 GE (V)111...555234 VVBINIA=S2=.55VV RRENT (A)22..05 OLD (V)11..24 ON VOLTA11..5501 UIT CU1.5 HRESH01..80 OFF UTPUT 111...444789 T CIRC1.0 VVBIA=S2=.55VV ABLE T00..46 O1.46 HOR0.5 VIONUT=0V EN0.2 VIN=2.5V 1.45 S 0 0 -40-20 0 20 40 60 80 100120 -40-20 0 20 40 60 80 100120 3 3.5 4 4.5 5 5.5 6 6.5 TEMPERATURE(°C) TEMPERATURE(°C) BIAS VOLTAGE (V) November 2006 5 M9999-111306
Micrel, Inc. MIC49150 Typical Characteristics (cont.) EnableThreshold vs. Temperature 1.6 V)1.4 ON D (1.2 L O H1.0 S OFF RE0.8 H T0.6 E L NAB0.4 VBIAS=5V E0.2 VIN=2.5V 0 -40-20 0 20 40 60 80 100120 TEMPERATURE(°C) November 2006 6 M9999-111306
Micrel, Inc. MIC49150 Functional Characteristics November 2006 7 M9999-111306
Micrel, Inc. MIC49150 Functional Diagram V BIAS V IN Ilimit VEN/ADJ Fixed Enable Bandgap Adj. V V Open OUT IN R1 Circuit Fixed R2 November 2006 8 M9999-111306
Micrel, Inc. MIC49150 Application Information type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60% The MIC49150 is an ultra-high performance, low-dropout respectively over their operating temperature ranges. To linear regulator designed for high current applications use a ceramic chip capacitor with Y5V dielectric, the requiring fast transient response. The MIC49150 utilizes value must be much higher than an X7R ceramic or a two input supplies, significantly reducing dropout tantalum capacitor to ensure the same capacitance voltage, perfect for low-voltage, DC-to-DC conversion. value over the operating temperature range. Tantalum The MIC49150 requires a minimum of external comp- capacitors have a very stable dielectric (10% over their onents and obtains a bandwidth of up to 10MHz. As a operating temperature range) and can also be used with µCap regulator, the output is tolerant of virtually any type this device. of capacitor including ceramic type and tantalum type capacitors. Input Capacitor The MIC49150 regulator is fully protected from damage An input capacitor of 1µF or greater is recommended due to fault conditions, offering linear current limiting and when the device is more than 4" away from the bulk thermal shutdown. supply capacitance, or when the supply is a battery. Small, surface-mount, ceramic chip capacitors can be Bias Supply Voltage used for the bypassing. The capacitor should be placed V , requiring relatively light current, provides power to within 1" of the device for optimal performance. Larger BIAS the control portion of the MIC49150. V requires values will help to improve ripple rejection by bypassing BIAS approximately 33mA for a 1.5A load current. Dropout the input to the regulator, further improving the integrity conditions require higher currents. Most of the biasing of the output voltage. current is used to supply the base current to the pass transistor. This allows the pass element to be driven into Thermal Design saturation, reducing the dropout to 300mV at a 1.5A load Linear regulators are simple to use. The most current. Bypassing on the bias pin is recommended to complicated design parameters to consider are thermal improve performance of the regulator during line and characteristics. Thermal design requires the following load transients. Small ceramic capacitors from V to application-specific parameters: BIAS ground help reduce high frequency noise from being • Maximum ambient temperature (T ) injected into the control circuitry from the bias rail and A • Output current (I ) are good design practice. Good bypass techniques OUT typically include one larger capacitor such as 1µF • Output voltage (VOUT) ceramic and smaller valued capacitors such as 0.01µF • Input voltage (V ) IN or 0.001µF in parallel with that larger capacitor to • Ground current (I ) GND decouple the bias supply. The V input voltage must BIAS First, calculate the power dissipation of the regulator be 1.6V above the output voltage with a minimum V BIAS from these numbers and the device parameters from this input voltage of 3 volts. datasheet. Input Supply Voltage P = V × I + V × I – V × I D IN IN BIAS BIAS OUT OUT VIN provides the high current to the collector of the pass The input current will be less than the output current at transistor. The minimum input voltage is 1.4V, allowing high output currents as the load increases. The bias con-version from low voltage supplies. current is a sum of base drive and ground current. Ground current is constant over load current. Then the Output Capacitor heat sink thermal resistance is determined with this The MIC49150 requires a minimum of output capaci- formula: tance to maintain stability. However, proper capacitor ⎛T −T ⎞ selection is important to ensure desired transient θ =⎜ J(MAX) A ⎟−(θ +θ ) response. The MIC49150 is specifically designed to be SA ⎜⎝ PD ⎟⎠ JC CS stable with virtually any capacitance value and ESR. A The heat sink may be significantly reduced in 1µF ceramic chip capacitor should satisfy most app- applications where the maximum input voltage is known lications. Output capacitance can be increased without and large compared with the dropout voltage. Use a bound. See “Typical Characteristic” for examples of load series input resistor to drop excessive voltage and transient response. distribute the heat between this resistor and the X7R dielectric ceramic capacitors are recommended regulator. The low-dropout properties of the MIC49150 because of their temperature performance. X7R-type allow significant reductions in regulator power dissipation capacitors change capacitance by 15% over their and the associated heat sink without compromising operating temperature range and are the most stable performance. When this technique is employed, a November 2006 9 M9999-111306
Micrel, Inc. MIC49150 capacitor of at least 1µF is needed directly between the input and regulator ground. Refer to “Application Note 9” for further details and examples on thermal design and heat sink specification. MSOP-8 Minimum Load Current The MIC49150, unlike most other high current regulators, does not require a minimum load to maintain output voltage regulation. Power MSOP-8 Thermal Characteristics q JA One of the secrets of the MIC49150’s performance is its q q ground plane power MSOP-8 package featuring half the thermal JC CA heat sink area resistance of a standard MSOP-8 package. Lower AMBIENT thermal resistance means more output current or higher input voltage for a given package size. Lower thermal resistance is achieved by joining the four printed circuit board ground leads with the die attach paddle to create a Figure 1. Thermal Resistance single-piece electrical and thermal conductor. This Figure 2 shows copper area versus power dissipation concept has been used by MOSFET manufacturers for with each trace corresponding to a different temperature years, proving very reliable and cost effective for the rise above ambient. user. From these curves, the minimum area of copper Thermal resistance consists of two main elements, θ JC necessary for the part to operate safely can be (junction-to-case thermal resistance) and θ (case-to- CA determined. The maximum allowable temperature rise ambient thermal resistance). See Figure 1. θ is the JC must be calculated to determine operation along which resistance from the die to the leads of the package. θ CA curve. is the resistance from the leads to the ambient air and it includes θ (case-to-sink thermal resistance) and θ 900 CS SA (sink-to-ambient thermal resistance). 800 Using the power MSOP-8 reduces the θ dramatically 2m)700 JC m and allows the user to reduce θCA. The total thermal A (600 resistance, θ (junction-to-ambient thermal resistance) RE500 JA A is the limiting factor in calculating the maximum power R 400 E dissipation capability of the device. Typically, the power P300 P MSOP-8 has a θ of 80°C/W, this is significantly lower O200 JA C than the standard MSOP-8 which is typically 160°C/W. 100 θ is reduced because pins 5 through 8 can now be 0 CA 0 0.25 0.50 0.75 1.00 1.25 1.50 soldered directly to a ground plane which significantly POWER DISSIPATION (W) reduces the case-to-sink thermal resistance and sink to Figure 2. Copper Area vs. Power-MSOP ambient thermal resistance. Power Dissipation (∆T ) JA Low-dropout linear regulators from Micrel are rated to a 900 maximum junction temperature of 125°C. It is important 800 TJ=125°C not to exceed this maximum junction temperature during 2m)700 85°C 50°C 25°C operation of the device. To prevent this maximum m junction temperature from being exceeded, the A (600 appropriate ground plane heat sink must be used. RE500 A R 400 E P300 P O200 C 100 0 0 0.25 0.50 0.75 1.00 1.25 1.50 POWER DISSIPATION (W) Figure 3. Copper Area vs. Power-MSOP Power Dissipation (T ) A November 2006 10 M9999-111306
Micrel, Inc. MIC49150 ∆T = T – T The θ of this package is ideally 80°C/W, but it will vary J(max) A(max) JA T = 125°C depending upon the availability of copper ground plane J(max) to which it is attached. T = maximum ambient operating temp- A(max) erature Adjustable Regulator Design For example, the maximum ambient temperature is The MIC49150 adjustable version allows programming 50°C, the ∆T is determined as follows: the output voltage anywhere between 0.9Vand 5V. Two ∆T = 125°C – 50°C resistors are used. The resistor value between V and OUT ∆T = 75°C the adjust pin should not exceed 10kΩ. Larger values can cause instability. The resistor values are calculated Using Figure 2, the minimum amount of required copper by: can be determined based on the required power dissipation. Power dissipation in a linear regulator is ⎛V ⎞ R1=R2×⎜ OUT −1⎟ calculated as follows: ⎜⎝ 0.9 ⎟⎠ P = V × I + V × I – V × I D IN IN BIAS BIAS OUT OUT Where V is the desired output voltage. OUT Using a typical application of 750mA output current, 1.2V output voltage, 1.8V input voltage and 3.3V bias voltage, Enable the power dissipation is as follows: The fixed output voltage versions of the MIC49150 P = (1.8V) × (730mA) + 3.3V(30mA) – 1.2V(750mA) feature an active high enable input (EN) that allows on- D off control of the regulator. Current drain reduces to At full current, a small percentage of the output current is “zero” when the device is shutdown, with only supplied from the bias supply, therefore the input current microamperes of leakage current. The EN input has is less than the output current. TTL/CMOS compatible thresholds for simple logic P = 513mW D interfacing. EN may be directly tied to V and pulled up IN From Figure 2, the minimum current of copper required to the maximum supply voltage. to operate this application at a ∆T of 75°C is less than 100mm2. Quick Method Determine the power dissipation requirements for the design along with the maximum ambient temperature at which the device will be operated. Refer to Figure 3, which shows safe operating curves for three different ambient temperatures: 25°C, 50°C and 85°C. From these curves, the minimum amount of copper can be determined by knowing the maxi-mum power dissipation required. If the maximum ambient temperature is 50°C and the power dissipation is as above, 513mW, the curve in Figure 3 shows that the required area of copper is less than 100mm2. November 2006 11 M9999-111306
Micrel, Inc. MIC49150 Package Information 8-Pin MSOP (MM) 5-Pin S-Pak (R) November 2006 12 M9999-111306
Micrel, Inc. MIC49150 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgicalimplant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2003 Micrel, Incorporated. November 2006 13 M9999-111306
Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrel: MIC49150-1.2YMM TR MIC49150-0.9YMM TR M icrochip: MIC49150-1.5WR MIC49150-1.2WR MIC49150-1.2YMM MIC49150-1.5YMM MIC49150YMM MIC49150WR MIC49150-0.9YMM MIC49150-1.8WR MIC49150-1.8YMM MIC49150-0.9WR MIC49150-1.8YMM-TR MIC49150- 1.5YMM-TR MIC49150-1.8WR-TR MIC49150-0.9YMM-TR MIC49150WR-TR MIC49150-0.9WR-TR MIC49150- 1.2YMM-TR MIC49150-1.5WR-TR MIC49150YMM-TR