LM3488Q-Q1 40V Wide Vin low-side N-channel controller for switching Regulators with 5µA shutdown current | TI.com

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40V Wide Vin low-side N-channel controller for switching Regulators with 5µA shutdown current


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  • LM5155-Q1  - The device has the SAME FUNCTIONALITY as the compared device, but is not pin-for-pin equivalent and may not be parametrically equivalent.   For applications requiring lower quiescent current or higher efficiency


The LM3488 is a versatile low-side N-FET high-performance controller for switching regulators. This device is suitable for use in topologies requiring low-side FET, such as boost, flyback, or SEPIC. Moreover, the LM3488 can be operated at extremely high switching frequency to reduce the overall solution size. The switching frequency of LM3488 can be adjusted to any value from 100 kHz to 1 MHz by using a single external resistor or by synchronizing it to an external clock. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor.

The LM3488 has built-in features such as thermal shutdown, short-circuit protection, and overvoltage protection. Power-saving shutdown mode reduces the total supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.


  • Automotive Grade Product, AEC-Q100 Qualified
  • 8-Lead VSSOP Package
  • Internal Push-Pull Driver With 1-A Peak Current Capability
  • Current Limit and Thermal Shutdown
  • Frequency Compensation Optimized With a Capacitor and a Resistor
  • Internal Soft-Start
  • Current Mode Operation
  • Undervoltage Lockout With Hysteresis
  • Key Specifications:
    • Wide Supply Voltage Range of 2.97 V to 40 V
    • 100-kHz to 1-MHz Adjustable and Synchronizable Clock Frequency
    • ±1.5% (Overtemperature) Internal Reference
    • 5-µA Shutdown Current (Overtemperature)
  • Create a Custom Design Using the LM3488 with the WEBENCH Power Designer

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  Min   Max Range
Vin  V 2.97 to 40.0V
Vout  V 1.265 to 300V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C


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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Duty cycle (Max) (%) Operating temperature range (C) Rating Type Package Group
LM3488Q-Q1 Order now 2.97     40     1.26     500     1     100     1000     2.7     Adjustable Current Limit
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up    
100     -40 to 125     Automotive     Controller     VSSOP | 8