ISL8105 and ISL8105A are single-phase PWM controllers with integrated MOSFET gate drivers for synchronous buck converters. The devices operate from +5V or +12V bias supply voltage. ISL8105 integrates a linear regulator, boot diode, and N-Channel MOSFET gate drivers, reducing external component count and board space requirements. These features make the IC suitable for a wide range of applications. Utilizing voltage-mode control, the output voltage can be precisely regulated to as low as 0.6V. The 0.6V internal reference features a maximum tolerance of ±1.0% over the commercial temperature range, and ±1.5% over the industrial temperature range. Two fixed oscillator frequency versions are available; 300kHz (ISL8105 for high efficiency applications) and 600kHz (ISL8105A for fast transient applications). The ISL8105 features the capability of safe start-up with pre-biased load. It also provides overcurrent protection by monitoring the ON-resistance of the bottom-side MOSFET to inhibit PWM operation appropriately. During start-up interval, the resistor connected to BGATE/BSOC pin is employed to program overcurrent protection condition. This approach simplifies the implementation and does not deteriorate converter efficiency.
The ISL8105 family is a single‑phase PWM controller for synchronous buck converters that can be powered from a +5 V or +12 V bias supply. It integrates a linear regulator, boot diode and N‑channel MOSFET gate drivers, reducing external component count and board space.
The device features voltage‑mode control with a 0.6 V internal reference, selectable fixed oscillator frequencies (300 kHz for ISL8105, 600 kHz for ISL8105A), safe start‑up with pre‑biased load, and over‑current protection that monitors the bottom‑side MOSFET’s on‑resistance.
| Operating Frequency | 300 kHz (ISL8105) / 600 kHz (ISL8105A) |
|---|---|
| Input Voltage Range | 1.0 V to 12 V (up to 20 V with restrictions) |
| Output Voltage Range | 0.6 V to Vout (adjustable) |
| Internal Reference Voltage | 0.6 V |
| Reference Voltage Tolerance | ±1.0 % (commercial, 0 °C‑70 °C) / ±1.5 % (industrial, –40 °C‑85 °C) |
| Thermal Resistance (DFN) | 4.5 °C/W |
The controller can be powered from either a +5 V or a +12 V bias supply.
It monitors the on‑resistance of the bottom‑side MOSFET and uses a resistor (Rgsoc) to set the trip level.
The internal reference voltage is 0.6 V.
ISL8105 uses 300 kHz, while ISL8105A uses 600 kHz.