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
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.
Parameters
| Attributes | Value |
|---|---|
| Outputs (Max) (#) | 2 |
| Phases (Max) | 8 |
| Output Voltage (Min) (V) | 5 |
| Output Voltage (Max) (V) | 300 |
| Bias Voltage Range (V) | 40 - 40 |
| Integrated MOSFET Driver (s) | Yes |
| Input Voltage (Min) (V) | 4.5 |
| Input Voltage (Max) (V) | 80 |
| Qualification Level | Standard |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TQFN | 5.0 x 5.0 x 0.75 | 32 | 0.5 |
Application Block Diagrams
 | Power Supply for 5G Infrastructure 5G power supply offers high efficiency, low noise, and robust performance for diverse 5G applications. |
 | Peltier Cooling and Heating Vests Air-conditioned work clothes with built-in fans and a Peltier cooler offer precise temperature control for challenging work environments. |
Additional Applications
- Telecommunication
- Server and data center
- Automotive electronics
- Industrial equipment
- Power system
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Support Communities
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ISL81805 temperature is high
DEAR sir ISL81805 is currently used to develop D to D power, and the following problems are encountered 1) The IC itself is very hot, about 80 degrees C without load, and even higher to 100 degrees C when loaded. The GND PAD under the IC is connected to the ...
Apr 14, 2025 -
inquiry Regarding ISL78225
I'm looking for an integrated circuit (IC) that can control a high-voltage, high-current multiphase boost converter with the following specifications: Output Voltage: Approximately 400V Per-Phase Current: Around 40A Application: A multiphase boost converter design Does ISL78225 can meet these requirements? If not, any advice or recommendations ...
Apr 4, 2025
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