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LM3478: Difference between LM3478 and LM3488

Part Number: LM3478
Other Parts Discussed in Thread: LM3488, LM5155, LM5156


Can I please get the difference between LM3478 and LM3488?

Also I am planning to use such controller as low side buck as shown in below pic. Are there any newer ones apart from these two chips that can do close to 100% duty cycle with internal options for slope compensation.

Thanks, Prithvi