Modern electronic systems require host different regulated voltages po

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Modern electronic systems require host different regulated voltages po

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AND8170/D Small, Simple, Buck Controller Replace High Current LDOs
Modern electronic systems require host different regulated voltages power their various subsystems. number voltage levels needed boards risen generations processors, memory, etc., have been introduced with lower voltage requirements. Also, required voltage keeps decreasing designers must include other voltage trend distributed power architectures design individual, nonisolated, Point-Of-Load (POL) converters supply power each individual load. power supply usually exists generating additional lower voltages often requires additional post-regulators. dropout, linear regulators, LDOs, typically used post-regulation because they easily implemented provide relatively noise-free power source. However, higher currents, such above, LDOs take great deal space dissipate much power thus heat. dropout applications where need another voltage rail, already have rail, simple buck converter provides more efficient choice than linear regulator. example would rail from existing rail. load, could used post-regulator, best-case efficiency would V/5.0 which equates approximately 66%. Also, dissipates Another example power rail derived from existing rail. load, best-case efficiency would V/3.3 which equates approximately 76%. power dissipation example, linear regulator would have come TO-220 D2PAK package (X23 high). circuit question cannot dissipate power efficiently (for instance, enclosed systems with little airflow) heat given exceed thermal budget system. Alternatively, circuit Figure shows simple, five (Thin SOT-23-5), buck controller. design that provides from input, efficiency output ripple voltage this circuit mVp-p. This circuit also does require external compensation disabled shut load with chip enable (CE) pin. this makes this solution about simple implement it's rival, LDO.
NCP1550SN33 NCP1550SN25 NCP1550SN18
NTHS4101P
Vout Vout Vout MBRM110L Vout NCP1550SN33 Vout NCP1550SN25 Vout NCP1550SN18
NCP1550SN18 NCP1550SN25 NCP1550SN33 VOUT
Vout Vout
Figure Simple Buck Controller Converting 1.8, 2.5, from
Semiconductor Components Industries, LLC, 2004
August, 2004 Rev.
Publication Order Number: AND8170/D
AND8170/D
EFFICIENCY Iout Circuit from Figure Circuit from Figure NCP1550SN33 NCP1550SN25 NCP1550SN18
Figure NCP1550 Efficiency Iout
Figure Output Ripple mA/div)
Proper passive component selection helped raise system's overall efficiency. MOSFET used (NTHS4101P) typical RDS(on) around designed operating point comes very small thermally efficient ChipFET package. Schottky used (MBRM110L) device which offers lower than most comparable devices. Figure shows Schottky platform compares other typical platforms. More information about this product family found application note AND8083/D, "Efficiency Improvements Using Schottky Diodes" from Semiconductor.
Semiconductor
Improvement
Industry Typical
Figure Schottky Typical Competition
Schottky starts showing benefits duty cycle circuit decreases conducts more current. instance, since voltage levels continue lower, rail necessary. This solution still outperforms LDO. instance, wanted supply from rail, would have best-case efficiency V/3.3 which equates approximately with power dissipation circuit from Figure with above conditions efficiency another note, buck converters draw less current from input power sources than LDOs. LDO's input current same output current, buck converter's input current function efficiency converter. instance, converter mentioned previously, which efficiency 83%, (Vo*Io)/*Vin. Therefore, which equates savings input current from solution. solutions, which have efficiencies their given conditions 88%, input current equates respectively. This reduction input current helps keep power budget existing converters down which equate smaller size, better performance, lower cost. Finally, user scale this design higher currents adjusting transistor, diode, inductor, capacitor accordingly. More details components required operation found NCP1550 data sheet. This solution provides good replacement LDOs when requires high currents, dropout, good thermal performance, i.e. efficiency, without adding much complexity.
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AND8170/D
Table Bill Materials Circuit from Figure
Version Designator Version Designator Version Designator Description PFM/PWM Step-Down DC-DC Controller Schottky Power Rectifier Power MOSFET Profile Tantalum Chip Capacitor Tantalum Chip Capacitor Power Inductor Value Vout, 1.90 Tolerance Footprint Thin SOT-23-5 POWERMITER ChipFETt 6032-28 7343-31 Manufacturer Semiconductor Semiconductor Semiconductor Kemet Kemet Sumida Manufacturer Part Number NCP1550SN33T1 MBRM110LT3 NTHS4101PT1 T491C336K010AS T494D686K010AS CDC5D233R3 Description PFM/PWM Step-Down DC-DC Controller Schottky Power Rectifier Power MOSFET Profile Tantalum Chip Capacitor Power Inductor Value Vout, 1.44 Tolerance Footprint Thin SOT-23-5 POWERMITER ChipFETt 6032-28 Manufacturer Semiconductor Semiconductor Semiconductor Kemet Sumida Manufacturer Part Number NCP1550SN25T1 MBRM110LT3 NTHS4101PT1 T491C336K010AS CDC5D235R6 Description PFM/PWM Step-Down DC-DC Controller Schottky Power Rectifier Power MOSFET Profile Tantalum Chip Capacitor Power Inductor Value Vout, 1.36 Tolerance Footprint Thin SOT-23-5 POWERMITE® ChipFETt 6032-28 Manufacturer Semiconductor Semiconductor Semiconductor Kemet Sumida Manufacturer Part Number NCP1550SN18T1 MBRM110LT3 NTHS4101PT1 T491C336K010AS CDC5D236R8
Figure NCP1550 Evaluation Board
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AND8170/D
ChipFET trademark Vishay Siliconix. POWERMITE registered trademark used under license from Microsemi Corporation.
Semiconductor registered trademarks Semiconductor Components Industries, (SCILLC). SCILLC reserves right make changes without further notice products herein. SCILLC makes warranty, representation guarantee regarding suitability products particular purpose, does SCILLC assume liability arising application product circuit, specifically disclaims liability, including without limitation special, consequential incidental damages. "Typical" parameters which provided SCILLC data sheets and/or specifications vary different applications actual performance vary over time. operating parameters, including "Typicals" must validated each customer application customer's technical experts. SCILLC does convey license under patent rights rights others. SCILLC products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure SCILLC product could create situation where personal injury death occur. Should Buyer purchase SCILLC products such unintended unauthorized application, Buyer shall indemnify hold SCILLC officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs, damages, expenses, reasonable attorney fees arising directly indirectly, claim personal injury death associated with such unintended unauthorized use, even such claim alleges that SCILLC negligent regarding design manufacture part. SCILLC Equal Opportunity/Affirmative Action Employer. This literature subject applicable copyright laws resale manner.
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AND8170/D

Modern electronic systems require host different regulated voltages po

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