LTC3636/LTC3636-1 Dual Channel 6A, 20V Monolithic Synchronous Step-Down Regulator FEATURESDESCRIPTION n Wide VIN Range: 3.1V to 20V The LTC®3636/LTC3636-1 is a high efficiency, dual- n Wide VOUT Range: channel monolithic synchronous buck regulator using a n 0.6V to 5V (LTC3636) controlled on-time current mode architecture, with phase n 1.8V to 12V (LTC3636-1) lockable switching frequency. The operating supply volt- n Output Current per Channel: 6A age range is from 3.1V to 20V, making it suitable for n High Efficiency: Up to 95% lithium-ion battery stacks as well as point of load power n Die Temperature Monitor supply applications from a 12V or 5V input. n Adjustable Switching Frequency: 500kHz to 4MHz The operating frequency is programmable from 500kHz to n External Frequency Synchronization 4MHz with an external resistor and may be synchronized n Current Mode Operation for Excellent Line and to an external clock signal. The high frequency capability Load Transient Response allows the use of small surface mount inductors and n 0.6V Reference Allows Low Output Voltages capacitors. The unique constant frequency/controlled on- n User Selectable Burst Mode® Operation or Forced time architecture is ideal for high step-down ratio applica- Continuous Operation tions that operate at high frequency while demanding fast n Output Voltage Tracking and Soft-Start Capability transient response. n Short-Circuit Protected n Overvoltage Input and Overtemperature Protection The LTC3636/LTC3636-1 can select between forced con- n Power Good Status Outputs tinuous mode and high efficiency Burst Mode operation. n Low Profile 4mm × 5mm 28-Lead QFN Package The LTC3636 and LTC3636-1 differ in their output voltage sense range. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611. n Distributed Power Systems n Battery-Powered Instruments n Point-of-Load Power Supplies TYPICAL APPLICATION VIN 10V TO 20V Efficiency vs Load Current 47µF VIN2 VIN1 ×2 100 RUN1 INTVCC fSW = 2MHz RUN2 ITH1 4.7µF 97 LTC3636/ VIN = 12V LTC3636-1 ITH2 94 RT 91 TMON MODE/SYNC TRACKSS2 TRACKSS1 88 PGOOD2 PGOOD1 85 BOOST2 BOOST1 82 0.1µF 0.1µF EFFICIENCY (%) 0.56µH 0.56µH 79 VOUT2 SW2 SW1 VOUT1 5V AT 6A 3.3V AT 6A 76 47µF 47µF 73.2k 45.3k V 73 OUT = 5V 22pF 22pF VOUT = 3.3V VFB2 GND VFB1 70 10k 10k 0 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6.0 LOAD CURRENT (A) 3636 TA01a 3636 TA01b Rev. C Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
