PDF《LT8619/LT8619-5》

LT8619/LT8619-5

1 For more information www.

analog.com TYPICAL APPLICATION FEATURES DESCRIPTION 60V, 1.2A Synchronous Monolithic Buck Regulator with 6?A Quiescent Current The LT?

8619 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 6μA of quiescent current. The LT8619 can deliver 1.2A of continuous current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. Low ripple Burst Mode? operation enables high efficiency down to very low output currents while keeping the output ripple to 10mVP-P. A SYNC pin allows forced continuous mode operation synchronized to an external clock. Internal com- pensation with peak current mode topology allows the use of small inductors and results in fast transient response and good loop stability. The EN/UV pin has an accurate 1V threshold and can be used to program VIN undervoltage lockout or to shut down the LT8619, reducing the input supply current to below 0.6μA. The PG flag signals when VOUT is within ±7.5% of the programmed output voltage. The LT8619 is available in a small 16-lead MSOP and 10-lead 3mm * 3mm DFN packages with exposed pad for low thermal resistance. APPLICATIONS n n Wide Input Voltage Range: 3V to 60V n n Fast Minimum Switch-On Time: 30ns n n Ultralow Quiescent Current Burst Mode Operation: n n 6μA IQ Regulating 12VIN to 3.3VOUT n n 10mVP-P Output Ripple at No Load n n Synchronizable/Programmable Fixed Frequency Forced Continuous Mode Operation: 300kHz to?2.2MHz n n High Efficiency Synchronous Operation: n n 92% Efficiency at 0.5A, 5VOUT from 12VIN n n 90% Efficiency at 0.5A, 3.3VOUT from 12VIN n n Low Dropout: 360mV at 0.5A n n Low EMI n n Accurate 1V Enable Pin Threshold n n Internal Soft-Start and Compensation n n Power Good Flag n n Small Thermally Enhanced 16-Lead MSOP Package and 10-Lead (3mm * 3mm) DFN Packages n n 12V Automotive Systems n n 12V and 24V Commercial Vehicles n n 48V Electric and Hybrid Vehicles n n Industrial Supplies All registered trademarks and trademarks are the property of their respective owners. Efficiency at VOUT = 5V 5V, 1.2A Step-Down Converter LT8619-5 10?H 66.5k OFF ON 0.1?F 22?F

8619 TA01a 1?F 2.2?F VIN 6V TO 60V VOUT 5V 1.2A BST SW BIAS PG OUT INTVCC VIN GND SYNC fOSC = 700kHz EN/UV RT PG 100k L = VISHAY IHLP-2020BZ-01 COUT = TDK C3225X7R1C226K250 Document Feedback LT8619/LT8619-5

2 For more information www.analog.com ABSOLUTE MAXIMUM RATINGS VIN, EN/UV.60V BIAS.30V BST Pin Above SW Pin.4V PG, SYNC, OUT.6V FB 2V (Notes 1, 2) ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8619EDD#PBF LT8619EDD#TRPBF LGNP 10-Lead (3mm * 3mm) Plastic DFN C40°C to 125°C LT8619IDD#PBF LT8619IDD#TRPBF LGNP 10-Lead (3mm * 3mm) Plastic DFN C40°C to 125°C LT8619EMSE#PBF LT8619EMSE#TRPBF

8619 16-Lead Plastic MSOP C40°C to 125°C LT8619IMSE#PBF LT8619IMSE#TRPBF

8619 16-Lead Plastic MSOP C40°C to 125°C LT8619EMSE-5#PBF LT8619EMSE-5#TRPBF

86195 16-Lead Plastic MSOP C40°C to 125°C LT8619IMSE-5#PBF LT8619IMSE-5#TRPBF

86195 16-Lead Plastic MSOP C40°C to 125°C Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in

500 unit reels through designated sales channels with #TRMPBF suffix. TOP VIEW

11 GND DD PACKAGE 10-LEAD (3mm * 3mm) PLASTIC DFN θJA = 43°C/W, θJC = 10°C/W EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB