ISL6528

Features:

* Pb-Free Available (RoHS Compliant)
* Provides two regulated voltages
- One standard buck PWM
- One linear controller
* Small converter size
- 600kHz constant frequency operation
- Small external component count
* Excellent output voltage regulation
- Both outputs: ±2% over temperature
* Single 5V bias and bootstrap supply
* Output voltage range: 0.8V to 3.3V
* Simple single-loop voltage-mode PWM control design
* Fast PWM converter transient response
- High-bandwidth error amplifier
- Full 0100% duty ratio
* Linear controller drives bipolar linear pass transistor
* Fully-adjustable outputs
* Undervoltage fault monitoring on both outputs




Application

* GraphicsGPU and memory supplies
* ASIC power supplies
* Embedded processor and I/O supplies
* DSP supplies




Pinout






Specifications

UGATE, BOOT. . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to +10V
VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to +7V
FB, DRIVE2, FB2, COMP, . . . . . . . . . . . GND -0.3V to VCC +0.3V
ESD Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2




Description

The ISL6528 provides the power control and protection for two output voltages in high-performance graphics cards and other embedded processor applications. The dual-output controller drives an N-Channel MOSFET in a standard buck topology and a NPN pass transistor in a linear configuration. The ISL6528 provides both a regulated high current, low voltage supply and an independent, lower current supply integrated in an 8-lead SOIC package. The controller is ideal for graphics card applications where both graphics processing unit (GPU) and memory supplies are required. The standard buck converter is a simple, single feedback loop, voltage-mode control with fast transient response. Both the switching regulator and linear regulator provide a maximum static regulation tolerance of 2% over line, load, and temperature ranges. Each output is user-adjustable by means of external resistors. An integrated soft-start feature brings both supplies into regulation in a controlled manner. Each output is monitored via the FB pins for undervoltage events. If either output drops below 52.5% of the internal reference voltage, both regulators are shutdown.