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06-10-2017

150V Fast High Side Protected N-Channel MOSFET Driver Provides 100% Duty Cycle Capability

Analog Devices » LTC7000, LTC7000-1

Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC7000/-1, a high speed, high side N-channel MOSFET driver that operates up to a 150 V supply voltage. Its internal charge pump fully enhances an external N-channel MOSFET switch, allowing it to remain on indefinitely. The LTC7000/-1’s powerful 1 Ω gate driver can drive large gate capacitance MOSFETs with very short transition times, ideal for both high frequency switching and static switch applications.

Analog Devices - LTC7000, LTC7000-1

The LTC7000/-1 operates over a 3.5 V to 135 V, 150 VPK input supply range with a 3.5 V to 15 V bias voltage range. It detects an overcurrent condition by monitoring the voltage across an external sense resistor placed in series with the drain of the external MOSFET. When the LTC7000/-1 senses that the switch current has exceeded a preset level, a fault flag is asserted and the switch is turned off for a period of time set by an external timing capacitor. After a predetermined time period, the LTC7000/-1 automatically retries.

The LTC7000/-1 is designed to receive a ground referenced, low voltage digital input signal and quickly drive a high side N-channel power MOSFET whose drain can be as high as 150 V above ground. The fast 13 ns rise and fall times, when driving a 1,000 pF load, minimize switching losses. The LTC7000 is the full featured device and has additional features over the LTC7000-1, including enable, overvoltage lockout, adjustable current limit and current monitoring.

The LTC7000 is available in the MSOP-16 package and the LTC7000-1 is available in the MSOP-16 (12) with four leads removed for high voltage spacing. Three operating junction temperature grades are available, with extended and industrial versions from –40 to 125°C, high temp automotive version from –40 °C to 150 °C and a military grade from –55 °C to 150 °C. The 1,000-piece price starts at $2.75 each.

Summary of Features: LTC7000/-1

  • Wide VIN Operating Range: 3.5 V to 135 V (150 V Abs Max)
  • 100% Duty Cycle Capability
  • 1 Ω Pull-Down, 2 Ω Pull-Up for Fast Turn-On and Turn-Off Times
  • Short-Circuit Protected
  • Automatic Restart Timer
  • Open-Drain Fault Flag
  • Integrated Bootstrap Diode
  • Adjustable Turn-On Slew Rate
  • Bias Supply from 3.5 V to 15 V
  • Adjustable Current Limit (LTC7000)
  • Current Monitor Output (LTC7000)
  • Adjustable Input Undervoltage and Overvoltage Lockout (LTC7000)
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