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/µs 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.
Key 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
- 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)
Applications
- Power Supplies for Microprocessors
- 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
Order Information| Part Number | Package Type | Weight(g) | Pins | MSL Rating | Peak Temp (°C) | RoHS Status |
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| ISL6520CB | 8 Ld SOIC | 0.072 | 8 | 1 | 240 | |
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| ISL6520CB-T | 8 Ld SOIC T+R | 0.072 | 8 | 1 | 240 | |
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| ISL6520CBZ | 8 Ld SOIC | 0.072 | 8 | 1 | 260 | RoHS |
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| ISL6520CBZ-T | 8 Ld SOIC T+R | 0.072 | 8 | 1 | 260 | RoHS |
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| ISL6520CR | 16 Ld QFN | 0.043 | 16 | 1 | 240 | |
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| ISL6520CR-T | 16 Ld QFN T+R | 0.043 | 16 | 1 | 240 | |
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| ISL6520CRZ | 16 Ld QFN | 0.043 | 16 | 3 | 260 | RoHS |
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| ISL6520CRZ-T | 16 Ld QFN T+R | 0.043 | 16 | 3 | 260 | RoHS |
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| ISL6520IB | 8 Ld SOIC | 0.072 | 8 | 1 | 240 | |
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| ISL6520IB-T | 8 Ld SOIC T+R | 0.072 | 8 | 1 | 240 | |
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| ISL6520IBZ | 8 Ld SOIC | 0.072 | 8 | 1 | 260 | RoHS |
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| ISL6520IBZ-T | 8 Ld SOIC T+R | 0.072 | 8 | 1 | 260 | RoHS |
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| ISL6520IR | 16 Ld QFN | 0.043 | 16 | 1 | 240 | |
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| ISL6520IR-T | 16 Ld QFN T+R | 0.043 | 16 | 1 | 240 | |
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| ISL6520IRZ | 16 Ld QFN | 0.043 | 16 | 3 | 260 | RoHS |
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| ISL6520IRZ-T | 16 Ld QFN T+R | 0.043 | 16 | 3 | 260 | RoHS |
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| ISL6520EVAL1 | | | | N/A | | |
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