LT8390A 60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum FEATURES DESCRIPTION n 4-Switch Single Inductor Architecture Allows V The LT 8390A is a synchronous 4-switch buck-boost DC/DC IN Above, Below or Equal to V controller that regulates output voltage, input or output OUT n Up to 95% Efficiency at 2MHz current from an input voltage above, below, or equal to n Proprietary Peak-Buck Peak-Boost Current Mode the output voltage. The proprietary peak-buck peak-boost n Wide V Range: 4V to 60V current mode control scheme allows adjustable and syn- IN n 1.5% Output Voltage Accuracy: 1V V 60V chronizable 600kHz to 2MHz fixed frequency operation, or OUT n 3% Input or Output Current Accuracy with Monitor internal 25% triangle spread spectrum frequency modula- n Spread Spectrum Frequency Modulation for Low EMI tion for low EMI. With a 4V to 60V input voltage range, n High Side PMOS Load Switch Driver 0V to 60V output voltage capability, and seamless low n No Top MOSFET Refresh Noise in Buck or Boost noise transitions between operation regions, the LT8390A n Adjustable and Synchronizable: 600kHz to 2MHz is ideal for voltage regulator, battery and supercapacitor n V Disconnected from V During Shutdown charger applications in automotive, industrial, telecom, OUT IN n Available in 28-Lead TSSOP with Exposed Pad and and even battery-powered systems. 28-Lead QFN (4mm 5mm) The LT8390A provides input or output current monitor n AEC-Q100 Qualified for Automotive Applications and power good flag. Fault protection is also provided to detect output short-circuit condition, during which the APPLICATIONS LT8390A retries, latches off, or keeps running. All registered trademarks and trademarks are the property of their respective owners. n Automotive, Industrial, Telecom Systems n High Frequency Battery-Powered System TYPICAL APPLICATION 95% Efficient 48W (12V 4A) 2MHz Buck-Boost Voltage Regulator 1H 5m 10m V V OUT IN 6V TO 28V 12V 22F 22F 0.1F 0.1F 4A CONTINUOUS SW1 LSP LSN SW2 0.1F 63V 0.1F 16V 4V TO 56V BST1 BST2 2 100V 16V TRANSIENT 22F 2 2 16V Efficiency vs V IN 4.7F 100V INTV INTV 100 CC CC BG1 BG2 2 GND 90 TG1 TG2 LT8390A V V IN OUT 1F 1F 80 383k 10 EN/UVLO ISP 1F 10 70 169k 110k LOADTG ISN I = 4A OUT I = 2A TEST FB OUT SSFM OFF 60 CONTINUOUS OPERATION WITH ISMON ISMON 10k SYNC/SPRD HIGHEST COMPONENT TEMPERATURE INTV CC BELOW 90C (T = 25C) CTRL INTV SSFM ON A CC 50 4.7F 0 5 10 15 20 25 30 35 40 133k 100k 100k LOADEN INPUT VOLTAGE (V) V PGOOD PGOOD REF 8390a TA01b SS V RT 0.47F C 59.0k 22nF 10k 2MHz 2.2nF 8390a TA01a Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8390A ABSOLUTE MAXIMUM RATINGS (Note 1) V , EN/UVLO, V , ISP, ISN ...................................60V FB, LOADEN, SYNC/SPRD, CTRL, PGOOD ..................6V IN OUT (ISP-ISN) .........................................................1V to 1V Operating Junction Temperature Range (Notes 2, 3) BST1, BST2 ...............................................................66V LT8390AE .......................................... 40C to 125C SW1, SW2, LSP, LSN .................................... 6V to 60V LT8390AI ........................................... 40C to 125C INTV , (BST1-SW1), (BST2-SW2) .............................6V LT8390AH .......................................... 40C to 150C CC (BST1-LSP), (BST1-LSN) ............................................6V LT8390AJ .......................................... 40C to 150C Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION TOP VIEW TOP VIEW BG1 1 28 BG2 BST1 2 27 BST2 SW1 3 26 SW2 28 27 26 25 24 23 TG1 4 25 TG2 TG1 1 22 TG2 LSP 5 24 V OUT LSP 2 21 V OUT LSN 6 23 LOADTG LSN 3 20 LOADTG 29 V 4 19 SYNC/SPRD V 7 22 SYNC/SPRD IN 29 IN GND GND INTV 5 18 RT INTV 8 21 RT CC CC EN/UVLO 6 17 V C EN/UVLO 9 20 V C TEST 7 16 FB TEST 10 19 FB LOADEN 8 15 SS LOADEN 11 18 SS 9 10 11 12 13 14 V 12 17 PGOOD REF CTRL 13 16 ISMON ISP 14 15 ISN UFD PACKAGE 28-LEAD (4mm 5mm) PLASTIC QFN FE PACKAGE 28-LEAD PLASTIC TSSOP = 43C/W, = 3.4C/W JA JC EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB = 30C/W, = 5C/W JA JC EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB Rev. B 2 For more information www.analog.com V SW1 REF CTRL BST1 ISP BG1 ISN BG2 ISMON BST2 PGOOD SW2