Overview
Description
The ISL81805 is a dual synchronous boost controller that generates two independent outputs or one output with two interleaved phases for a wide variety of applications in industrial and general purpose segments. With a wide input and output voltage ranges, the controller is suitable for telecommunication, data center, and computing applications.
The ISL81805 uses peak current mode control with phase interleaving for the two outputs. Each output has a voltage regulator, current monitor, and average current regulator to provide independent average voltage and current control. The internal Phase-Locked Loop (PLL) oscillator assures an accurate frequency setting from 100kHz to 1MHz, and the oscillator can be synchronized to an external clock signal for frequency synchronization and phase interleave paralleling applications. This PLL circuit can output a phase-shift-programmable clock signal that is expanded to three, four, and six phases with required interleaving phase shift.
The ISL81805 features programmable soft-start and accurate threshold enable functions along with a power-good indicator to simplify power supply rail sequencing. It also provides full protection features such as OVP, UVP, OTP, and average and peak current limit on both outputs to ensure high reliability.
The IC is packaged in a space conscious 32 Ld 5 × 5 mm TQFN.
Features
- Wide input voltage range: 4.5V to 80V
- Wide output voltage range: 5V to 80V
- Four MOSFET drivers with adaptive shoot-through protection
- Constant output voltage and output current feedback loop control
- Light-load efficiency enhancement
- Low ripple diode emulation and burst mode operation
- Programmable soft-start
- Supports startup into pre-biased rails
- Programmable frequency: 100kHz to 1MHz
- Support current sharing with cascade phase interleaving
- External clock sync
- Clock out with accurate phase angle controlled by PLL or frequency dithering
- PGOOD indicator
- Input current monitor
- Selectable mode between PWM/DE/Burst
- Accurate EN/UVLO threshold: ±2%
- Low shut down current: 5μA
- Complete protection: OCP (pulse by pulse and optional hiccup or constant current mode), OVP, OTP, and UVP
Comparison
Applications
Documentation
Featured Documentation
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Design & Development
Boards & Kits
Evaluation
ISL81805EVAL1Z
Active
Dual-Phase Synchronous Boost EVB with 9V to 36V Input Range, 48V 5A Output
The ISL81805EVAL1Z dual-phase evaluation board features the ISL81805, an 80V high voltage dual synchronous boost controller that offers external soft-start, independent enable functions, and integrates UV/OV/OC/OT protection. A programmable switching frequency ranging from 100kHz to 1MHz helps...
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Evaluation
ISL81805EVAL2Z
Active
Dual-Output Sync Boost EVB - 9V to 36V Vin Range for 48V 3A Output, 9V to 20V Vin Range for 24V 5A Output
The ISL81805EVAL2Z dual-output evaluation board features the ISL81805, an 80V high voltage dual synchronous boost controller that offers external soft-start, independent enable functions, and integrates UV/OV/OC/OT protection. A programmable switching frequency ranging from 100kHz to 1MHz helps...
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Evaluation
ISL81805EVAL3Z
Active
Dual-Output Negative-to-Positive EVB, with -36V to -60V Input Range, 28V 20A Output and 5V 20A Output
The ISL81805EVAL3Z dual-output evaluation board, with negative-to-positive voltage conversion features the ISL81805, which is an 80V high voltage, dual synchronous boost controller that offers external soft-start and independent enable functions and integrates UV/OV/OC/OT protection. A...
Recommended Documents:
Evaluation
ISL81805EVAL4Z
Preview
Dual-Phase Negative-to-Positive EVB with -36V to -60V Input Range, 28V 20A Output
The ISL81805EVAL4Z dual-phase negative-to-positive voltage conversion evaluation board features the ISL81805, which is an 80V high voltage, dual synchronous boost controller that offers external soft-start and independent enable functions and integrates UV/OV/OC/OT protection. A programmable...
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Reference Designs
CN190-1-5GPWR-REFZ
Active
5G Second Stage Power Reference Design
The CN190-1-5GPWR-REFZ reference design provides an Application Accelerator Unit (AAU) Power Amplifier (PA) power solution to enable -48V to 48V non-isolated solution. It supports up to 1500W of output. This board allows quick evaluation of the ISL81805 80V dual synchronous boost controller and...
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Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
Product Options
Applied Filters:
Videos & Training
High-performance 80V Dual-phase Buck and Boost Controllers for GaN FETs
An overview of the industry’s first high-performance 80V dual-phase buck and boost controllers optimized to drive GaN FETs. With high efficiency, tight load regulation and current sharing, these devices deliver ideal power solutions for industrial automation, telecommunications, medical and automotive applications.
Video List
