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ISL78200 Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL78200 Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 19 page 1 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter ISL78200 The ISL78200 is a synchronous buck controller with a 90mΩ high side MOSFET and low side driver integrated. The ISL78200 supports a wide input voltage range from 3V to 40V. Regarding the output current capability, the ISL78200 can typically support a continuous load of 2.5A under conditions of 5V VOUT, VIN range of 8V to 36V, 500kHz, +85°C ambient temperature with still air. For any specific application, the actual maximum output current depends upon the die temperature not exceeding +125°C with the power dissipated in the IC, which is related to input voltage, output voltage, duty cycle, switching frequency, ambient temperature and board layout, etc. Refer to the Output Current section on page 14 for more details. The ISL78200 has flexible selection of operation modes of forced PWM mode and PFM mode. In PFM mode, the quiescent input current is as low as 300µA and can be further reduced to 180µA with AUXVCC connected to VOUT under 12V VIN and 5V VOUT application. The load boundary between PFM and PWM can be programmed to cover wide applications. The low side driver can be either used to drive an external low side MOSFET for a synchronous buck, or left unused for a standard non-synchronous buck. The low side driver can also be used to drive a boost converter as a pre-regulator that greatly expands the operating input voltage range down to 3V or lower (refer to “Typical Application Schematic III - Boost Buck Converters” on page 5). The ISL78200 offers the most robust current protections. It uses peak current mode control with cycle-by-cycle current limiting. It is implemented with frequency foldback under current limit condition; in addition, the hiccup overcurrent mode is also implemented to guarantee reliable operations under harsh short conditions. The ISL78200 has comprehensive protections against various faults including overvoltage and over-temperature protections, etc. Features • Ultra Wide Input Voltage Range 3V to 40V • Selectable Mode Operation - Forced PWM Mode -PFM Mode - Programmable Current Boundary between PFM and PWM Modes • 300µA IC Quiescent Current (PFM, No Load); 180µA Input Quiescent Current (PFM, No Load, VOUT Connected to AUXVCC) • Less than 3µA Standby Input Current (IC Disabled) • Operational Topologies -Synchronous Buck -Non-Synchronous Buck -Two Stage Boost Buck • Programmable Frequency from 200kHz - 2.2MHz and Frequency Synchronization Capability • ±1% Tight Voltage Regulation Accuracy • Reliable Cycle by Cycle Overcurrent Protection - Temperature Compensated Current Sense - Frequency Foldback - Programmable OC Limit -Hiccup Mode Protection in Worst Case Short Condition • 20 Ld HTSSOP Package • Pb-Free (RoHS Compliant) Applications • Automotive Applications • General Purpose Power Regulator • 24V Bus Power •Battery Power • Embedded Processor and I/O Supplies FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE, VOUT 5V, TA = +25°C VOUT ISL78200 VCC SGND MODE BOOT VIN PHASE PGND FS EXT_BOOST EN FB COMP VIN AUXVCC LGATE ILIMIT SS SYNC PGOOD 50 55 60 65 70 75 80 85 90 95 100 0.1m 1m 10m 100m 1 2.5 LOAD CURRENT (A) 6V VIN 12V VIN 24V VIN 40V VIN September 22, 2011 FN7641.0 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. |
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