TPS543620

• Fixed-frequency, internally-compensated advanced current mode (ACM) control
• Integrated 25-mΩ and 6.5-mΩ MOSFETs
• Input voltage range: 4 V to 18 V
• Output voltage range: 0.5 V to 5.5 V
• Three selectable PWM ramp options to optimize the control loop performance
• Five selectable switching frequencies: 500 kHz, 750 kHz, 1 MHz, 1.5 MHz, and 2.2 MHz
• Synchronizable to an external clock
• 0.5-V, ±0.5% voltage reference accuracy over full temperature range
• Selectable soft start times: 0.5 ms, 1 ms, 2 ms, and 4 ms
• Monotonic start-up into pre-biased outputs
• Selectable current limits to support 6-A and 3-A operation
• Enable with adjustable input undervoltage lockout
• Power good output monitor
• Output overvoltage, output undervoltage, input undervoltage, overcurrent, and overtemperature protection
• Pin-to-pin compatible with TPS543820 and TPS543320
• –40°C to 150°C operating junction temperature
• 2.5-mm × 3-mm, 14-pin VQFN-HR package with 0.5-mm pitch

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The TPS543620 is a high-efficiency 18-V, 6-A synchronous buck converter employing an internally-compensated, fixed-frequency Advanced Current Mode control. It is capable of providing high efficiency while running at a switching frequency up to 2.2 MHz. The device is in a small 2.5-mm x 3-mm HotRod™ VQFN package, which coupled with high efficiency at high frequency, makes it optimal for designs requiring a small solution size. The fixed frequency controller can operate from 500 kHz to 2.2 MHz and can be synchronized to an external clock using the SYNC pin. Additional features include a high accuracy voltage reference, selectable soft start times, montonic start-up into pre-biased outputs, selectable current limits, adjustable UVLO through the EN pin, and a full suite of fault protections.