LP8358 150mA, µCap, Dropout Voltage Regulator with Power Good LP8

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LP8358 150mA, µCap, Dropout Voltage Regulator with Power Good LP8

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LP8358 150mA, µCap, Dropout Voltage Regulator with Power Good
LP8358 150mA, µCap, Dropout Voltage Regulator with Power Good
LP8358 µCap, precise CMOS voltage regulator with Power good output RDSON. provides 150mA consumes typical 10nA shutdown mode. LP8358 output stage designed with push pull output faster transient recovery response. LP8358 optimized work with value, cost ceramic capacitors. output typically require only output capacitance stability. enable tied easy board layout. LP8358 designed portable, battery powered equipment applications with small space requirements. LP8358 available 5-pin SOT-23 package. Performance specified -40°C +125°C temperature range available fixed 1.2V. other output voltage options, please contact National Semiconductor.
Features
power good RDSON: Power good indicator Stability with capacitors ground current: 120µA 150mA output current "Zero" shutdown current mode Fast transient recovery response Auto discharge Thermal shutdown Current limiting
Applications
Processor power-up sequencing Laptop, notebook palm computer PCMCIA regulation switching
Typical Application
20057919
Ordering Information
Package 5-Pin SOT-23 Part Number LP8358MF-1.2 LP8358MFX-1.2 Package Marking LH2B Transport Media Units Tape Reel Units Tape Reel Drawing MF05A
2003 National Semiconductor Corporation
DS200579
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LP8358
Connection Diagram
SOT23-5
20057921
View
Description
Number Name Function Input Voltage Ground Enable Input Logic, Logic High Enabled Logic Shutdown leave open) Power Good Output Output Voltage
VOUT
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LP8358
Block Diagram
20057920
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LP8358
Absolute Maximum Ratings
(Note
Operating Ratings
Supply Voltages Junction Temp. Range (Note Storage Temperature Range Package Themal Resistance SOT23-5 235°C/W 2.7V -40°C +125°C -65°C 150°C
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Tolerance (Note Human Body Model Junction Temperature VIN, VOUT, Soldering Information Infrared Convection sec) Wave Soldering sec) 235°C 260°C (lead temp) 2000V 150°C -0.3 6.5V
Electrical Characteristics
Unless otherwise specified, limits guaranteed 25°C, 2.7V, 100µA, COUT 1µF, 2.0V. Boldface limits apply over entire operating temperature range, -40°C 125°C. Symbol VO/VO VO/VO IGND Parameter Output Voltage Accuracy Line Regulation Load Regulation Quiescent Current 100µA 2.7V 0.1mA 150mA (Note 0.4V (Shutdown), Conditions (Note -0.3 0.01 (Note (Note Units
Ground Current (Note 0mA, 2.0V (active), 150mA, 2.0V (active),
PSRR ILIMIT
Power Supply Rejection Ratio Current Limit Thermal Shutdown Temperature
120Hz, COUT 4.7µF, 150mA VOUT
Thermal Protection
Enable Input Power Good RDSON Delay Threshold High Threshold Output Logic-Low Voltage Power Good Output Resistance Power Good Leakage Current Delay Time Power Good VOUT VOUT OFF) IPOWERGOOD 100µA, Fault Condition IPOWERGOOD 1mA, Fault Condition Power Good Off, 5.5V Timing Diagram 0.01 10.0 Enable Input Current Enable Input Voltage Level Logic (off) 5.5V Logic High (on), 5.5V 0.4V, 5.5V 2.0V, 5.5V 0.01 0.01
Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device intended functional, specific performance guaranteed. guaranteed specifications test conditions, Electrical Characteristics. Note Human body model, 1.5k series with 100pF. Note maximum power dissipation function TJ(max) maximum allowable power dissipation ambient temperature (TJ(max)-T A)/JA. numbers apply packages soldered directly into board. Note Typical Values represent most likely parametric norm. Note limits guaranteed testing statistical analysis. Note Regulation measured constant junction temperature using duty cycle pulse testing.
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LP8358
Electrical Characteristics Timing Diagram
(Continued)
Note Ground current regulator quiescent current. total current drawn from supply load current plus ground current.
20057915
Typical delay time power good
20057925
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LP8358
Typical Performance Characteristics
25°C powergood pull resistor 47k. Ground Current Output Current
Unless otherwise specified, 3.3V, COUT 1µF, Ground Current Input Voltage
20057901
20057902
Ground Current Temperature
Short Circuit Current Temperature
20057903
20057904
Short Circuit Current Input Voltage
Power Good Delay Input Voltge
20057905
20057906
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LP8358
Typical Performance Characteristics Unless otherwise specified, 3.3V, COUT 1µF,
25°C powergood pull resistor 47k. (Continued) Power Good Delay Temperature Power Good RDSON Temperature
20057907 20057924
Output Voltage Temperature
Output Voltage Input Voltage
20057908
20057909
Output Voltage Output Current
Enable Voltage Input Voltage
20057911
20057922
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LP8358
Typical Performance Characteristics Unless otherwise specified, 3.3V, COUT 1µF,
25°C powergood pull resistor 47k. (Continued) Enable Voltage Temperature Voltage Noise Frequency
20057923
20057912
PSRR Frequency
Power Reset Delay Time
20057914 20057913
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LP8358
Application Notes
LP8358 linear regulator with power good output designed used with ESR, cost ceramic capacitors. EXTERNAL CAPACITORS LP8358 regulator requires output capacitor maintain stability. capacitor must least greater. capacitor low-ESR ceramic chip capacitor, however improved capacitance over temperature, tantalum capacitors used. input capacitor recommend when supply capacitance more than inches away from device, when supply battery. dielectric ceramic capacitors recommended because their temperature performance. X7R-type capacitor change capacitance over their operating temperature range most stable type ceramic capacitors. dielectric capacitors change value much respectively over their operating temperature range. ceramic chip capacitor with dielectric, value must much higher than X7/R ceramic tantalum capacitor ensure same minimum capacitance value over operating temperature range. Tantalum capacitors have very stable dielectric (10% over their operating temperature range) also used with this device. ENABLE/SHUTDOWN LP8358 active high enable that allows regulator disabled. Applying Logic Level Shutdown will cause output turn off, this state current consumed regulator goes nearly zero. Applying Logic Level high 2.0V) enables output voltage. enable/shutdown must left floating; floating enable cause indeterminate state output. ACTIVE SHUTDOWN LP8358 designed with N-channel MOSFET that acts shutdown clamp. N-channel turns when device disabled allow output capacitor load discharge POWER GOOD power good output open-drain output with extreme RDSON. designed essentially work power-on reset generator once regulated voltage and/
fault condition. When fault condition occurs, output power good goes low. power good output comes back once output reached nominal value delay passed timing diagram. LP8358 internal circuit monitors overcurrent, temperature falling output voltage. these conditions flagged this indicates fault condition. flagged condition output into onchip delay circuit that drives open drain output transistor. TRANSIENT RESPONSE LP8358 implements unique output stage dramatically improve transient response recovery time. output totem-pole configuration with P-channel MOSFET pass device N-channel MOSFET clamp. N-channel clamp significantly smaller device that prevents output voltage from overshooting when heavy load removed. This feature helps speed transient response significantly decreasing transient response recovery time during transition from heavy load light load. THERMAL BEHAVIOR LP8358 regulator internal thermal shutdown protect device from over heating. Under operating conditions, maximum junction temperature LP8358 must below 125°C. Maximum power dissipation calculated based output current voltage drop across part. maximum power dissipation PD(MAX) (TJ(MAX) junction-to-ambient thermal resistance, 235°C/W LP8358 SOT23-5 package. maximum ambient temperature J(MAX) maximum junction temperature die, 125°C. When operating LP8358 room temperature, maximum power dissipation 425mW. actual power dissipated regulator (VIN -VOUT)IL +VIN IGND Substituting PD(MAX), determined above, solving operating condition that critical application will give maximum operating condition regulator circuit. prevent device from entering thermal shutdown, maximum power dissipation cannot exceeded.
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LP8358 150mA, µCap, Dropout Voltage Regulator with Power Good
Physical Dimensions
unless otherwise noted
inches (millimeters)
5-Pin SOT23-5 Package Number MF05A
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
National Semiconductor Asia Pacific Customer Support Center Fax: +65-6250 4466 Email: ap.support@nsc.com Tel: +65-6254 4466
National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LP8358 150mA, µCap, Dropout Voltage Regulator with Power Good LP8

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