The AIC1570 is a 5-bit DAC that combines a synchronous PWM power regulator with an LDO and a linear controller. It is compatible with HIP6018 and provides 3 regulated voltages for the microprocessor core, clock, and GTL power. It features a simple voltage-mode PWM control, a dual N-channel MOSFET synchronous driver, and operates from +3.3V, +5V, and +12V inputs. The AIC1570 offers fast transient response, a full 0% to 100% duty ratio, ±1.0% output voltage for VCORE, and ±2.0% output voltage reference for VCLK and VGTL. It has a TTL compatible 5-bit digital-to-analog core output voltage selection with a range from 1.3V to 3.5V, adjustable in 0.1V steps from 2.1V to 3.5V and 0.05V steps from 1.3V to 2.05V. The AIC1570 also has adjustable current limit, microprocessor core voltage protection against shorted MOSFET, power good output voltage monitor, and over-voltage and over-current fault monitors. It operates with a 200KHz free-running oscillator programmable up to 350KHz.
The AIC1570 is a single-chip solution combining a synchronous buck converter, a low dropout linear regulator (LDO), and a linear controller. It provides three regulated voltages: the PWM controller regulates the microprocessor core voltage using an integrated 5-bit DAC for selection between 2.1V to 3.5V or 1.3V to 2.05V. The LDO provides power for the clock driver circuit, while the linear controller drives an external N-channel MOSFET for GTL bus power.
The device includes comprehensive monitoring and protection functions such as Power Good output, over-voltage protection, and adjustable current limit without an external sense resistor. It operates from +3.3V, +5V, or +12V inputs and features a free-running oscillator programmable up to 350kHz.
| Supply Voltage Range | +3.3V, +5V and +12V Inputs |
|---|---|
| Core Voltage Regulation Accuracy | +/- 1.0% |
| Clock and GTL Reference Accuracy | +/- 2.0% |
| Oscillator Frequency Range | 200KHz to 350KHz |
No, it features an adjustable current limit without an external sense resistor by monitoring the voltage drop across the upper MOSFET's Rds(on).
The free-running oscillator can be programmed up to 350KHz.
The output voltage accuracy is +1.0% for VCORE.