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LTC1436AIGN Datasheet(PDF) 1 Page - Linear Technology |
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LTC1436AIGN Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LTC1436A LTC1436A-PLL/LTC1437A High Efficiency Low Noise Synchronous Step-Down Switching Regulators Figure 1. High Efficiency Step-Down Converter FEATURES DESCRIPTION , LTC and LT are registered trademarks of Linear Technology Corporation. Adaptive Power is a trademark of Linear Technology Corporation. s Maintains Constant Frequency at Low Output Currents s Dual N-Channel MOSFET Synchronous Drive s Programmable Fixed Frequency (PLL Lockable) s Wide VIN Range: 3.5V to 36V Operation s Low Minimum On-Time ( ≤300ns) for High Frequency, Low Duty Cycle Applications s Very Low Dropout Operation: 99% Duty Cycle s Low Dropout, 0.5A Linear Regulator for CPU I/O or Low Noise Audio Supplies s Built-In Power-On Reset Timer s Programmable Soft Start s Low-Battery Detector s Remote Output Voltage Sense s Foldback Current Limiting (Optional) s Pin Selectable Output Voltage s Logic Controlled Micropower Shutdown: IQ < 25µA s Output Voltages from 1.19V to 9V s Available in 24-Lead Narrow SSOP and 28-Lead SSOP Packages The LTC ®1436A/LTC1437A are synchronous step-down switching regulator controllers that drive external N-channel power MOSFETs in a phase lockable, fixed frequency architecture. The Adaptive Power TM output stage selectively drives two N-channel MOSFETs at frequencies up to 400kHz while reducing switching losses to maintain high efficiencies at low output currents. An auxiliary 0.5A linear regulator using an external PNP pass device provides a low noise, low dropout voltage source. A secondary winding feedback control pin (SFB) guarantees regulation regardless of the load on the main output by forcing continuous operation. An additional comparator is available for use as a low- battery detector. A power-on reset timer (POR) is included which generates a signal delayed by 65536/fCLK (300ms typically) after the output is within 5% of the regulated output voltage. Internal resistive dividers provide pin selectable output voltages with remote sense capability. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum). APPLICATIONS s Notebook and Palmtop Computers, PDAs s Cellular Telephones and Wireless Modems s Portable Instruments s Battery-Operated Devices s DC Power Distribution Systems TYPICAL APPLICATION COSC RUN/SS VIN VPROG + + + VIN 4.5V TO 22V CB 0.1 µF 4.7 µF 1000pF LTC1436A M1 Si4412DY L1 4.7 µH RSENSE 0.02 Ω COUT 100 µF 6.3V × 2 R1 35.7k R2 102k CIN 22 µF 35V × 2 COSC 43pF CSS 0.1 µF CC 510pF 100pF RC 10k VOUT 1.6V 5A M2 Si4412DY D1 MBRS140T3 SENSE+ SENSE– SGND M3 IRLML2803 DB CMDSH-3 TGL TGS SW BOOST BG PGND 1436 F01 INTVCC ITH VOSENSE |
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