Features
- Single inductor 4-switch buck-boost controller
- On-the-fly bidirectional operation with independent control of voltage and current on both ends
- Proprietary algorithm for smoothest mode transition
- MOSFET drivers with adaptive shoot-through protection
- Wide input voltage range: 4.5V to 60V
- Wide output voltage range: 0.8V to 60V
- Supports pre-biased output with SR soft-start
- Programmable frequency: 100kHz to 600kHz
- Supports parallel operation current sharing with cascade phase interleaving
- External sync with clock out or frequency dithering
- External bias for higher efficiency supports 8V - 36V input
- Output and input current monitor
- Selectable PWM mode operation between PWM/DE/Burst modes
- Accurate EN/UVLO and PGOOD indicator
- Low shutdown current: 2.7µA
- Complete protection: OCP, SCP, OVP, OTP, and UVP
- Dual-level OCP protection with average current and pulse-by-pulse peak current limit
- Selectable OCP response with either hiccup or constant current mode
- Negative pulse-by-pulse peak current limit
Description
The ISL81601 is a true bidirectional 4-switch synchronous buck-boost controller with peak and average current sensing and monitoring at both ends. Its wide input and output voltage ranges make it suitable for industrial, telecommunication, and after-market automotive applications.
The ISL81601 uses the proprietary buck-boost control algorithm with valley current modulation for Boost mode and peak current modulation for Buck mode control. The ISL81601 has four independent control loops for input and output voltages and currents. Inherent peak current sensing at both ends and cycle-by-cycle current limit of this family of products ensures high operational reliability by providing instant current limit in fast transient conditions at either end and in both directions. It also has two current monitoring pins at both input and output to facilitate Constant Current (CC) limit and other system management functions. CC operation down to low voltages avoids any runaway condition at overload or short-circuit conditions.
In addition to multilayer overcurrent protection, it also provides full protection features such as OVP, UVP, OTP, and average and peak current limit on both input and output to ensure high reliability in both unidirectional and bidirectional operation. The IC is packaged in a space-conscious 32 Ld 5mm x 5mm QFN package or easy to assemble 4.4mm x 9.7mm 38 Ld HTSSOP package. Both packages use an EPAD to improve thermal dissipation and noise immunity. Low pin count, fewer external components, and default internal values make the ISL81601 an ideal solution for quick-to-market simple power supply designs. The unique DE/Burst mode at light-load dramatically lowers standby power consumption with consistent output ripple over different load levels.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck-Boost |
| Outputs (#) | 1 |
| Input Voltage (Min) (V) | 4.5 |
| Input Voltage (Max) (V) | 60 |
| Output Voltage (Min) (V) | 0.8 |
| Output Voltage (Max) (V) | 60 |
| Quiescent Current | 50 µA |
| Switching Frequency Range (Typical) (kHz) | 600 - 600 |
| Output Per Driver UGATE Source|Sink | 2|3 |
| Output Per Driver LGATE Source|Sink | 2|3 |
| SYNCH Capability | Yes |
| Parallelable | Yes |
| Bi-direction | Yes |
| Control Type | Current Mode |
| Temp. Range (°C) | -40 to +125°C |
| Simulation Model Available | iSim |
Application Block Diagrams
 | 48V Mobility Platform This 48V mobility platform offers versatile, adaptable solutions for diverse electric mobility applications. |
 | Smart Waste Bin Smart waste bins monitor the environment and trash levels and ensure efficient communication. |
 | Power Line Feeder Terminal Unit Feeder terminal units monitor high-voltage power lines and measure and store data before uploading it to a central location. |
 | Watercraft Emergency Broadcast System The watercraft emergency broadcast system features high-performance control, HMI, GNSS connection, system encryption, and adaptive solar charging. |
 | Smart Solar Battery Charger Smart solar battery charger ensures efficient battery use, protects against overcharging, and adapts to variable inputs. |
Complete Your Design
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Renesas Boards & Kits
60V Synchronous Buck-Boost Controller Evaluation Board with 9V to 60V Vin range and 12V 10A Output
The ISL81601EVAL1Z evaluation board features the ISL81601, a 60V high voltage synchronous buck-boost controller that offers external soft-start and independent enable functions, and integrates UV/OV/OC/OT protections. A programmable switching frequency ranging from 100kHz to 600kHz helps to... Read More
60V Synchronous Buck-Boost Controller Evaluation Board with 32V to 60V Vin range and 48V 5A Output
The ISL81601EVAL2Z evaluation board features the ISL81601, a 60V high voltage synchronous buck-boost controller that offers external soft-start and independent enable functions, and integrates UV/OV/OC/OT protections. A programmable switching frequency ranging from 100kHz to 600kHz helps to... Read More
60V Buck-Boost Demo Board - GUI enables operation over 9V to 60V Vin range and 0.8V to 60V Output range
The ISL81601DEMO2Z demonstration board features the ISL81601 and RL78/G14. The ISL81601 is a 60V high voltage synchronous buck-boost controller. The RL78/G14 is a 28 pin MCU that offers digital control and measurement for charge and discharge functions. The ISL81601DEMO2Z can adjust the input... Read More
Parallelable 60V Sync Buck-Boost Controller Evaluation Board with 32V to 60V Vin range and 48V 10A Output
The ISL81601DEMO1Z demonstration board features the ISL81601, a 60V high voltage synchronous buck-boost controller that offers external soft-start, independent enable functions and integrates UV/OV/OC/OT protection. Programmable switching frequency ranging from 100kHz to 600kHz helps to optimize... Read More
Support Communities
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ISL81601 BBU. BAT – VIN. LOAD, DC – VOUT.
ISL81601 BBU. BAT – VIN. LOAD, DC – VOUT. Hello! Help me set up the ISL 81601 system to work as a backup power source. I have a battery connected to the VIN side. The load and the DC source are connected to the VOUT side. I need to charge the battery ...
Nov 13, 2024 -
ISL81601 / ISL81601DEMO2Z
Hi, i am using the demo board 2z and the PC Software evaluating ISL81601 . for my test i connect 6x Supercaps to VIN and charge to 15V@5A , Voltage 24V feed from a power supply to Vout in parallel i use a current sink with 3A. If i disconnet the ...
Apr 12, 2022 -
ISL81601 High current, powerful transistors
ISL81601 High current, powerful transistors Hello! I have problems starting the board with the ISL81601 chip. I plan to get high current (up to 50A). For this, I used low-resistance transistors (IQD005N04NM6ATMA1 Infineon transistors). 12V at the input. A resistive divider for 16.8V at the output. I attach ...
Oct 24, 2024
Knowledge Base
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What does a true bidirectional buck-boost controller do?
... and control the energy flow. Now on the right-hand side we tackle the same design using a bidirectional buck-boost controller such as ISL81401, ISL81601 or ISL81801. And as you can see only one set of electronics serves the purpose of both charging and discharging which significantly lowers the ...
Oct 21, 2020
Support Communities
