LT3692A Monolithic Dual Tracking 3.5A Step-Down Switching Regulator FeaTuresDescripTion n Wide Input Range: The LT®3692A is a dual current mode PWM step-down – Operation from 3V to 36V DC/DC converter with two internal 3.8A switches. Independent – OVLO Protects Circuit Through 60V Transients input voltage, shutdown, feedback, soft-start, UVLO current n Independent Supply, Shutdown, Soft-Start, UVLO, limit and comparator pins for each channel simplify complex Programmable Current Limit and Programmable power supply tracking and sequencing requirements. Power Good for Each 3.5A Regulator To optimize efficiency and component size, both convert- n Die Temperature Monitor ers have a programmable maximum current limit and are n Adjustable/Synchronizable Fixed Frequency synchronized to either a common external clock input, or Operation from 250kHz to 2MHz with Synchronized a resistor settable fixed 250kHz to 2MHz internal oscillator. Clock Output A frequency divider is provided for channel 1 to further n Independent Synchronized Switching Frequencies optimize component size. At all frequencies, a 180° phase Optimize Component Size relationship between channels is maintained, reducing volt- n Antiphase Switching age ripple and component size. A clock output is available n Outputs Can Be Paralleled for synchronizing multiple regulators. n Flexible Output Voltage Tracking n Low Dropout: 95% Maximum Duty Cycle Minimum input to output voltage ratios are improved by n 5mm × 5mm QFN Package allowing the switch to stay on through multiple clock cycles n FMEA Compliant 38-Pin Exposed Pad TSSOP Package only switching off when the boost capacitor needs recharg- ing. Independent channel operation can be programmed applicaTions using the SHDN pin. Disabling both converters reduces n Automotive Supplies the total quiescent current to <10µA. n Distributed Supply Regulation The LT3692A is an improved version of the LT3692 with L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks reduced minimum on-time. of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical applicaTionIndependent Synchronized Switching FrequenciesExtend Full Frequency Input Range3.3V and 1.2V 2-Stage Dual Step-Down Multi-Frequency Converter V V IN1 OUT1 CH1: 5.5V TO 36V 4.7µF V 550kHz IN1 VIN2 SHDN1 SHDN2 BST1 BST2 0.1µF SW1 SW2 CH2: 0.22µF IND1 IND2 2.2MHz V 4.7µH 0.5µH OUT1 LT3692A VOUT2 3.3V V 1.2V OUT1 VOUT2 2.5A 1A 47µF 24.9k FB1 FB2 V 550kHz 4.02k 100p 47µF 2.2MHz IN = 30V 3692A TA01b 100k CMPI1 CMPI2 FB1 8.06k 8.06k PG CMPO1 CMPO2 SS1 SS2 ILIM1 ILIM2 VC1 VC2 RT/SYNC CLKOUT CLKOUT 0.1µF 33pF 680pF 2.2MHz 220pF 0.1µF DIV TJ GND 22pF 100k 13k 68.1k 102k 10nF 40.2k 33.2k 3692a TA01a 3692a TA01c 3692afc For more information www.linear.com/3692A 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
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