LT3508 - Dual Monolithic 1.4A Step-Down Switching Regulator Data Sheet\r\n Linear Technology Corpora

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Specifications	LT3508 - Dual Monolithic 1.4A Step-Down Switching Regulator Data Sheet\r\n Linear Technology Corporation
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LT3508 1 3508fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Dual Monolithic 1.4A Step-Down Switching Regulator The

Specifications	LT3508 - Dual Monolithic 1.4A Step-Down Switching Regulator Data Sheet\r\n Linear Technology Corporation
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Content	LT3508 1 3508fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Dual Monolithic 1.4A Step-Down Switching Regulator The LT®3508 is a dual current mode PWM step-down DC/DC converter with internal power switches capable of generating two 1.4A outputs. The wide input voltage range of 3.7V to 36V makes the LT3508 suitable for regulating power from a wide variety of sources, including automo- tive batteries, 24V industrial supplies and unregulated wall adapters. Both converters are synchronized to a single os- cillator programmable up to 2.5MHz and run with opposite phases, reducing input ripple current. Its high operating frequency allows the use of small, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple. Each regulator has independent tracking and soft- start circuits and generates a power good signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs. Cycle-by-cycle current limit, frequency foldback and ther- mal shutdown provide protection against shorted outputs, and soft-start eliminates input current surge during start- up. The low current (<2μA) shutdown mode enables easy power management in battery-powered systems. 3.3V and 5V Dual Output Step-Down Converter with Output Sequencing n Wide Input Voltage Range: 3.7V to 36V n Two 1.4A Output Switching Regulators with Internal Power Switches n Adjustable 250kHz to 2.5MHz Switching Frequency n Synchronizable over the Full Frequency Range n Anti-Phase Switching Reduces Ripple n Uses Small Inductors and Ceramic Capacitors n Accurate Programmable Undervoltage Lockout n Independent Tracking, Soft-Start and Power Good Circuits Ease Supply Sequencing n Output Adjustable Down to 800mV n Small 4mm × 4mm 24-Pin QFN or 16-Pin Thermally Enhanced TSSOP Surface Mount Packages n Automotive n DSP Power Supplies n Wall Transformer Regulation n DSL and Cable Modems n PCI Express VIN5.6V TO 36V BOOST2 LT3508 VINSHDN GND 3508 TA01a RT/SYNC 100pF 10µF 22µF 4.7µF 0.22µF0.22µF ON OFF 43k 150pF 51k10.7k 52.3k fSW = 700kHz 35.7k 100k 56.2k 11.5k 10µH6.8µH POWER GOOD OUT2 5V 1.4A OUT1 3.3V 1.4A 1nF BOOST1 SW2SW1 FB2FB1 VC2 PG1 VC1 TRACK/SS1 PG2TRACK/SS2 , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. LOAD CURRENT (A) 065 EFFICIENCY (%) 70 75 80 85 95 0.51 3508 TA01b 1.5 90 VIN = 12V VOUT2 = 5V VOUT1 = 3.3V Efﬁ ciency
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Following Datasheets	350_appnote (1 pages) 350_appnote2 (1 pages) 352001 (1 pages) 3526lfb (16 pages) 3526llb2f (16 pages) 355_manual (23 pages) 358_REV3 (9 pages) 3598fa-1 (24 pages) 3599fa-1 (24 pages) 360_1 (6 pages)
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LT3508 - Dual Monolithic 1.4A Step-Down Switching Regulator Data Sheet\r\n Linear Technology Corporation

LT3508 - Dual Monolithic 1.4A Step-Down Switching Regulator Data Sheet\r\n Linear Technology Corporation