LT8630 100V, 0.6A Synchronous Micropower Step-Down High Efficiency Switching Regulator Fea T Descrip T n Ultrawide Input Voltage Range: 3V to 100V The LT 8630 is a current mode PWM step-down DC/DC n Boundary Mode Switching for Highest Efficiency converter with internal synchronous switches that provide n Output Voltage Range: 0.8V to 60V current for output loads up to 0.6A. The wide input range n Internal Synchronous Switches of 3V to 100V makes the LT8630 suitable for regulating n Burst Mode Operation: power from a wide variety of sources, including automotive 16A I at 12V to 5V and industrial systems and 36V to 72V telecom supplies. Q IN OUT 7A I at 48V to 5V Variable frequency boundary mode switching maximizes Q IN OUT n Low Dropout: 99% Maximum Duty Cycle efficiency across a wide range of input voltages. Low ripple n Peak Current Mode Control Burst Mode operation enables high efficiency operation n Programmable Undervoltage Lockout down to very low output currents while keeping the output n Power Good Flag ripple below 5mV. The soft-start feature controls the ramp n Flexible Output Voltage Tracking rate of the output voltage, eliminating input current surge n Short-Circuit Protection during start-up, while also providing output tracking. A n Low Shutdown Current: 5A power good flag signals when the output voltage is within n Tolerates Pin Open/Short Faults 7.5% of the regulated output. Undervoltage lockout can n Thermally Enhanced 20-Lead TSSOP with High be programmed using the EN/UV pin. Shutdown mode Voltage Lead Spacing reduces the total quiescent current to < 5A. The LT8630 is available in a 20-lead TSSOP package with exposed pad for low thermal resistance and high voltage lead spacing. a T L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks n Automotive Supplies of Linear Technology Corporation. All other trademarks are the property of their respective n owners. Telecom Supplies n Distributed Supply Regulation Typical a T 12V, 0.6A Step-Down Converter Efficiency at V = 12V OUT 100 V IN V BST IN 13V TO 100V LT8630 90 0.1F 22H 2.2F EN/UV SW 80 PG 70 IND 60 V OUT 12V INTV V CC OUT 50 0.6A 2.2F 10pF 1M 40 V = 24V IN RT FB V = 48V IN 71.5k 30 V = 72V 8.66k IN TR/SS V = 100V IN GND 20 47F 0 100 200 300 400 500 600 700 800 0.1F LOAD CURRENT (mA) 8630 TA01b 8630 TA01a 8630f 1 For more information www.linear.com/LT8630 EFFICIENCY (%) ion pplica ions pplica ion uresLT8630 a Te Maxi Mu M r a T p c F T (Note 1) V , EN/UV, PG ........................................................100V IN TOP VIEW IND, V , ...................................................... 60V/0.3V OUT V 1 20 SW IN FB, TR/SS ...................................................................4V Operating Junction Temperature Range 3 EN/UV 18 BST LT8630EFE (Note 2) ............................... 40C to 125C LT8630IFE (Note 2) ................................ 40C to 125C PG 5 16 INTV GND CC Storage Temperature Range .................. 65C to 150C 21 NC 6 15 NC DNC 7 14 IND RT 8 13 NC NC 9 12 V OUT TR/SS 10 11 FB FE PACKAGE VARIATION FE20(16) 20-LEAD PLASTIC TSSOP = 40C/W, = 10C/W JA JC(PAD) EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB o r D i n F Ma T (