ISL6520 Single Sync Buck PWM Controller for Broadband Gateway Applications

VIN (min) (V)	2.5
VIN (max) (V)	5
VOUT (min) (V)	0.8
VOUT (max) (V)	5
IOUT (max) (A)	20
VBIAS (V)	5

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, voltagemode 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/us 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.

ISL6520 特点

• 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)

ISL6520 应用

• 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

ISL6520 芯片订购指南

芯片型号	产品状态	温度范围	封装尺寸图	潮湿敏感度等级MSL	美元价格US $
ISL6520CBZ	量产	民用级	8 Ld SOIC	1
ISL6520CBZ-T	量产	民用级	8 Ld SOIC T+R	1
ISL6520CRZ	量产	民用级	16 Ld QFN	3
ISL6520CRZ-T	量产	民用级	16 Ld QFN T+R	3
ISL6520EVAL1	量产		评估板	N/A
ISL6520IBZ	量产	工业级	8 Ld SOIC	1
ISL6520IBZ-T	量产	工业级	8 Ld SOIC T+R	1
ISL6520IRZ	Coming Soon	工业级	16 Ld QFN	3
ISL6520IRZ-T	Coming Soon	工业级	16 Ld QFN T+R	3
ISL6520CB	停产	民用级	8 Ld SOIC	1	N/A
ISL6520CB-T	停产	民用级	8 Ld SOIC T+R	1	N/A
ISL6520CR	停产	民用级	16 Ld QFN	1	N/A
ISL6520CR-T	停产	民用级	16 Ld QFN T+R	1	N/A
ISL6520IB	停产	工业级	8 Ld SOIC	1	N/A
ISL6520IR	停产	工业级	16 Ld QFN	1	N/A
ISL6520IR-T	停产	工业级	16 Ld QFN T+R	1	N/A
ISL6520IB-T	To Be Discontinued	工业级	8 Ld SOIC T+R	1

ISL6520 应用技术支持与电子电路设计开发资源下载

1. ISL6520 数据资料 datatSheet 下载.PDF
2. Power 电源管理器件产品选型指南 . pdf