ISL81601

60V Bidirectional 4-Switch Synchronous Buck-Boost Controller

OVERVIEW

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 ends 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 over load 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.

KEY 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

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL81601
Topology
Buck-Boost
POR
Yes
# of Outputs
1
SYNCH Capability
Yes
Input Voltage Min (V)
4.5
Clock Out
Yes
VIN1 (max) (V)
60
Bi-direction
Yes
Output Voltage Min (V)
0.8
Dither
Yes
Output Voltage Max (V)
60
External Bias
Yes
IOUT @ RL
20
Parallelable
Yes
IQ
3 µA
Control Type
Current Mode

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