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LT3990-3.3

Analog Devices

350mA Step-Down Regulator

FEATURES n Low Ripple Burst Mode® Operation 2.5µA IQ at 12VIN to 3.3VOUT Output Ripple < 5mVP-P n Wide Input Voltag...


LT3990-3.3

Analog Devices


Octopart Stock #: O-1516815

Findchips Stock #: 1516815-F

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Description
FEATURES n Low Ripple Burst Mode® Operation 2.5µA IQ at 12VIN to 3.3VOUT Output Ripple < 5mVP-P n Wide Input Voltage Range: 4.2V to 62V Operating n Adjustable Switching Frequency: 200kHz to 2.2MHz n Integrated Boost and Catch Diodes n 350mA Output Current n Fixed Output Voltages: 3.3V, 5V 2µA IQ at 12VIN n Accurate Programmable Undervoltage
More View Lockout n FMEA Fault Tolerant (MSOP Package) Output Stays at or Below Regulation Voltage During Adjacent Pin Short or When a Pin is Left Floating n Low Shutdown Current: IQ = 0.7µA n Internal Sense Limits Catch Diode Current n Power Good Flag n Small, Thermally Enhanced 16-Pin MSOP and (3mm × 3mm) DFN Packages n AEC-Q100 Qualified for Automotive Applications APPLICATIONS n Automotive Battery Regulation n Power for Portable Products n Industrial Supplies LT3990/LT3990-3.3/LT3990-5 62V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes DESCRIPTION The LT®3990 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 62V, and consumes only 2.5µA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 5mV in a typical application. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions. An accurate programmable undervoltage lockout feature is available, producing a low shutdown current of 0.7µA. A power good flag signals when VOUT reaches 90% of the programmed output voltage. The LT3990 is available in small, thermally enhanced 16-pin MSOP and 3mm × 3mm DFN packages. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 5V Step-Down Converter VIN 6.5V TO 62V OFF ON VIN BOOST LT3990-5 EN/UVLO SW PG BD 0.22µF 33µH VOUT 5V 350mA 2.2µF RT VOUT GND 374k f = 400kHz 22µF 3990 TA01a POWER LOSS (mW) Power Loss 1000 VIN = 12V 100 10 1 0.1 0.01 0.001 0.01 0.1 1 10 LOAD CURRENT (mA) 100 3990 TA01b 3990b 1 LT3990/LT3990-3.3/LT3990-5 ABSOLUTE MAXIMUM RATINGS (Note 1) VIN, EN/UVLO Voltage...62V BOOST Pin Voltage..75V BOOST Pin Above SW Pin..30V FB/VOUT, RT Voltage...6V PG, BD Voltage...30V Operating Junction Temperature






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