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.
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)
