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LT8612 Datasheet(PDF) 1 Page - Linear Technology |
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LT8612 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 38 page  LT8603 1 8603f For more information www.linear.com/LT8603 TYPICAL APPLICATION FEATURES DESCRIPTION 42V, Low IQ, Quad Output Triple Monolithic Buck Converter and Boost Controller The LT®8603 is a highly flexible, quad output regulator combining two high input voltage capable monolithic step-down switching regulators, one low input voltage capable monolithic step-down regulator, and a boost controller to satisfy a wide range of applications while occupying minimal board space. With the boost controller configured to supply the chip VIN supply, the LT8603 produces three precisely regulated outputs even when the boost input voltage falls signifi- cantly below the regulated output voltages, such as dur- ing an automotive cold crank scenario. Alternatively, with the boost controller driven from one of the step-down regulator outputs or configured as a SEPIC, the LT8603 provides four precisely regulated outputs over a wide input voltage range. The LT8603 provides robust regulation by including a cycle-by-cycle current limit for all step-down regulators, thermal shutdown, and a boost controller that can tolerate reverse battery connections and negative transient input voltages down to –42V. Cold Crank Tolerant Automotive Triple Output Supply APPLICATIONS n Flexible Power Supply System Capable of Four Regulated Outputs with VBATT << VOUT n Two High Voltage Synchronous Buck Regulators n 3V to 42V Input Voltage Range n Output Currents Up to 2.5A and 1.5A n One Low Voltage Synchronous Buck Regulator n 2.6V to 5.5V Input Voltage Range n Output Currents Up to 1.8A n One Boost Controller Allows Buck Converters to Regulate with VBATT << VOUT n Selectable Burst Mode® Operation Allows Low 28µA IQ with High Voltage Channels Active n Programmable Power-On Reset n Individual Channel Power Good Indicators n Step-Down Switching Frequency: 250kHz to 2.2MHz n Available in 40-Lead QFN (6mm × 6mm) Package n Automotive Stop-Start and Cold Crank Ride Through n Last-Gasp CPU Power Hold-Up n Industrial Controls and Power Supplies All registered trademarks and trademarks are the property of their respective owners. LT8603 Response to a Cold Crank Automotive Input Waveform 8603 TA01a OUT4 8V FOR 2V < VBATT < 8.5V GND POREN POREN VBATT 2V TO 42V (BOOST START-UP ABOVE 4.3V) LT8603 FB4 GATE4 ISN4 PG1-4 BIAS RST PG1-4 OUT2 RESET ISP4 PVIN1 VIN EN/UVLO PVIN2 BST2 OUT3 1.2V, 1.8A SW3 FB3 OUT2 3.3V, 2.5A – IPVIN3 SW2 FB2 PVIN3 BST1 OUT1 5V, 1.5A SW1 FB1 TRKSS1-2 CPOR RT SYNC FSEL4B FSEL4A INTVCC INTVCC4 RUN3 2 4 TIME (10ms/DIV) VOLTAGE 2V/DIV 0V 8603 TA01b VBATT VOUT4 VOUT1 VOUT2 VOUT3 |
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