ISL78206

40V 2.5A Buck Controller with Integrated High-Side MOSFET

OVERVIEW

The ISL78206 is an AEC-Q100 qualified 40V, 2.5A synchronous buck controller with a high-side MOSFET and low-side driver integrated. The ISL78206 supports a wide input voltage range from 3V to 40V, output current up to 2.5A, and can be operated in synchronous and non-synchronous buck topologies. The ISL78206 provides a low system cost, high efficiency, single part buck solution for automotive applications for a wide variety of input voltages. For vehicle systems that must be kept powered during cold-cranking or start-stop operation, the ISL78206 can be replaced by its pin-to-pin alternative, the ISL78201 which offers boost-buck operation. Together, these devices offer two functional alternatives on the same PCB layout, providing convenience, flexibility, and facilitating extensive design reuse.

The ISL78206 offers the most robust current protections. It uses peak current mode control with cycle-by-cycle current limiting. It is implemented with frequency foldback undercurrent limit conditions. In addition, the hiccup overcurrent mode is also implemented to guarantee reliable operations under harsh short conditions.

The ISL78206 has comprehensive protections against various faults, including overvoltage, undervoltage, programmable overcurrent and over-temperature. Built-in soft-start allows the IC to start-up smoothly and is reactivated during hiccup mode fault recovery.

KEY FEATURES

  • Ultra wide input voltage range 3V to 40V (refer to “Input Voltage” on page 12 for more details)
  • Less than 5µA (max) shutdown input current (IC disabled)
  • Temperature range -40°C to +105°C
  • Integrated high-side MOSFET
  • Operational topologies
  • Synchronous buck
  • Non-synchronous buck
  • Programmable frequency from 200kHz to 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, pin-to-pin compatible with ISL78201 boost buck
  • AEC-Q100 qualified
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL78206
Basic Information
Production Status
Mass Production
Topology
Buck
# of Outputs
1
Input Voltage Min (V)
3
Input Voltage Max (V)
40
Output Voltage Min (V)
0.8
Output Voltage Max (V)
38
Output Current Max (A)
2.5
IQ
1.3 mA
Switching Freq. (max) (MHz)
2.2
Switching Freq. (min) (MHz)
0.2
Max Duty Cycle (%)
See Datasheet
Qualification Level
Automotive
Peak Efficiency (%)
96
POR
Yes
SYNCH Capability
Yes
Control Type
Current Mode
Switching Frequency Range (MHz)
0.2 to 2.2
Temperature Range
-40 to +105

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