ISL6520

Features:

* Operates from +5V Input
* 0.8V to VIN Output Range
- 0.8V Internal Reference
- ±1.5% Over Line Voltage and Temperature
* Drives N-Channel MOSFETs
* Simple Single-Loop Control Design
- Voltage-Mode PWM Control
* Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
* Lossless, Programmable Over-Current Protection
- Uses Upper MOSFET's rDS(on)
* Small Converter Size
- 300kHz Fixed Frequency Oscillator
- Internal Soft Start
- 8 Ld SOIC or 16Ld 4x4mm QFN
* QFN Package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
* Pb-Free Plus Anneal Available (RoHS Compliant)




Application

* Power Supplies for Microprocessors
-PCs
- Embedded Controllers
* Subsystem Power Supplies
- PCI/AGP/GTL+ Buses
- ACPI Power Control
* Cable Modems, Set Top Boxes, and DSL Modems
* DSP and Core Communications Processor Supplies
* Memory Supplies
* Personal Computer Peripherals
* Industrial Power Supplies
* 5V-Input DC/DC Regulators
* Low-Voltage Distributed Power Supplies




Pinout






Specifications

Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.0V
Absolute Boot Voltage, VBOOT . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Upper Driver Supply Voltage, VBOOT - VPHASE. . . . . . . . . . . +6.0V
Input, Output or I/O Voltage. . . . . . . . . . . GND -0.3V to VCC +0.3V
ESD Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Class 2




Description

The ISL6520 makes simple work out of implementing a complete control and protection scheme for a DC/DC stepdown converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, the ISL6520 integrates the control, output adjustment, monitoring and protection functions into a single 8-pin package.

The ISL6520 provides simple, single feedback loop, voltage-mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over temperature and line voltage variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost and efficiency.

The error amplifier features a 15MHz gain-bandwidth product and 8V/s slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%.

Protection from over-current conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor.