Features
- High efficiency synchronous buck regulator with up to 97% efficiency
- ±10% output voltage margining
- Adjustable current limit
- Start-up with prebiased output
- Internal soft-start - 1ms or adjustable, internal/external compensation
- Soft-stop output discharge during disabled
- Adjustable frequency from 500kHz to 4MHz - default at 1MHz
- External synchronization up to 4MHz - master to slave phase shifting capability
- Peak current limiting, hiccup mode short-circuit protection and over-temperature protection
Description
The ISL8018 is a high efficiency, monolithic, synchronous step-down DC/DC converter that can deliver up to 8A continuous output current from a 2. 7V to 5. 5V input supply. The output voltage is adjustable from 0. 6V to VIN. With an adjustable current limit, reverse current protection, prebias start and over-temperature protection, the ISL8018 offers a highly robust power solution. It uses current control architecture to deliver fast transient response and excellent loop stability. The ISL8018 integrates a pair of low ON-resistance P-channel and N-channel internal MOSFETs to maximize efficiency and minimize external component count. 100% duty-cycle operation allows less than 250mV dropout at 8A output current. Adjustable frequency and synchronization allow the ISL8018 to be used in applications requiring low noise. The ISL8018 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads. The ISL8018 is offered in a space saving 20 Ld 3x4 QFN lead free package with exposed pad lead frames for excellent thermal performance. The complete converter occupies less than 96. 8mm2 area.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck |
| Outputs (#) | 1 |
| Input Voltage (Min) [Rail 1] (V) | 2.7 |
| Input Voltage (Max) [Rail 1] (V) | 5.5 - 5.5 |
| Output Voltage (Min) [Rail 1] (V) | 0.6 |
| Output Voltage (Max) [Rail 1] (V) | 5.5 |
| Output Current (Max) [Rail 1] (A) | 8 |
| Switching Frequency Range (Typical) (kHz) | 500 - 4000 |
| Control Type | Current Mode |
| Peak Efficiency (%) | 97 |
| IQ [Rail 1] (µA) | 70 |
| SYNCH Capability | Yes |
| Qualification Level | Standard |
| Temp. Range (°C) | -40 to +85°C |
| Simulation Model Available | iSim |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| QFN | 4.0 x 3.0 x 0.90 | 20 | 0.5 |
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Renesas Boards & Kits
8A Low Quiescent Current High-Efficiency Synchronous Buck Regulator Demonstration Board
The ISL8018DEMO1Z demonstration board is intended for use by individuals with requirements for point-of-load applications sourcing from 2.7V to 5.5V. The ISL8018DEMO1Z simple smallest factor demo board is used for a quick and easy demonstration of the performance of the ISL8018 low quiescent,... Read More
8A Low Quiescent Current High-Efficiency Synchronous Buck Regulator Evaluation Board
The ISL8018EVAL3Z evaluation board is intended for use by individuals with requirements for point-of-load applications sourcing from 2.7V to 5.5V. The ISL8018EVAL3Z is used to evaluate the performance of the ISL8018 low quiescent, high-efficiency synchronous buck regulator.
The ISL8018EVAL3Z... Read More
Knowledge Base
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What is the purpose of the VSET pin on the ISL8018?
Question: What is the purpose of the VSET pin? Answer: VSET is the output margining setting of the regulators. The output voltage can margin by + or – 10% using VSET. This feature is valuable for compensating the IR dropped due to far away system load by increasing the voltage up 10 ...
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Why is it better to operate multiple ISL8018 devices out-of-phase?
Question: What are the advantages of operating ISL8018 in a multi-chip solution out-of-phase? Answer: One big benefit of operating out-of-phase is input current ripple is minimized. If we compare a three converters operating in-phase, the peak input ripple would be 24A or 12Arms at ...
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Can you show an example of using the ISL8018 in a multiple-chip application?
Question: Do you have an example of how you would configure the ISL8018 in a multi-chip configuration? Answer: See example below: In an application with two or more ISL8018, there is SYNCOUT feature which allows the channels to run at the same frequency and out-of-phase. By adjusting ...
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