Features
- Drives two N-Channel MOSFETs
- Operates from +5V or +12V input
- Simple single-loop control design
- Voltage-mode PWM control
- Fast transient response
- High-bandwidth error amplifier
- Full 0-100% duty ratio
- Excellent output voltage regulation
- 0.8V internal reference
- ±1% over line voltage and temperature
- Overcurrent fault monitor
- Does not require extra current sensing element
- Uses MOSFETs rDS(ON)
- Converter can source and sink current
- Pre-Biased Load Start Up
- Small converter size
- Constant frequency operation
- 200kHz free-running oscillator programmable from 50kHz to over 1MHz
- 14-lead SOIC package and 16-lead 5x5mm QFN Package
- QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat No Leads-Product Outline
- Near Chip-Scale Package Footprint; Improves PCB Efficiency and Thinner in Profile
- Pb-Free Available (RoHS Compliant)
Description
The ISL6522B provides complete control and protection for a DC-DC converter optimized for high-performance microprocessor applications. It is designed to drive two N-Channel MOSFETs in a synchronous rectified buck topology. The ISL6522B integrates all of the control, output adjustment, monitoring and protection functions into a single package. The output voltage of the converter can be precisely regulated to as low as 0. 8V, with a maximum tolerance of ±1% over temperature and line voltage variations. The ISL6522B provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a 200kHz free-running triangle-wave oscillator that is adjustable from below 50kHz to over 1MHz. The error amplifier features a 15MHz gain-bandwidth product and 6V/µs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0-100%. The ISL6522B protects against overcurrent conditions by inhibiting PWM operation. The ISL6522B monitors the current by using the rDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor.
Parameters
| Attributes | Value |
|---|---|
| Outputs (#) | 1 |
| Topology [Rail 1] | Buck |
| Input Voltage (Min) [Rail 1] (V) | 2.5 |
| Input Voltage (Max) [Rail 1] | 12 - 12 |
| Output Voltage (Min) [Rail 1] (V) | 0.8 |
| Output Voltage (Max) [Rail 1] (V) | 12 |
| Output Current (Max) [Rail 1] (A) | 30 |
| Switching Frequency Range (Typical) (kHz) | 50 - 1000 |
| Qualification Level | Standard |
| Temp. Range (°C) | -40 to +85°C |
| Simulation Model Available | No |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| QFN | 5.0 x 5.0 x 0.90 | 16 | 0.8 |
Applications
- Power supply for Pentium®, Pentium Pro, PowerPC® and AlphaPC microprocessors
- FPGA Core DC/DC Converters
- Low-voltage distributed power supplies
Knowledge Base
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How should I electrically connect the thermal pad for the ISL6522B?
Question: How should I electrically connect the thermal pad for the ISL6522B? Answer: The ISL6522B thermal pad should be electrically connected to ground.
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