ISL78263

Automotive 42V Dual Synchronous Boost and Low-Iq Buck Controllers with Integrated Drivers

Product Status: Mass Production

OVERVIEW

The ISL78263 offers synchronous boost and buck controllers. The boost controller operates either as an independent channel or as a pre-boost function that supplies the buck controller. The low-IQ buck controller uses only 6µA quiescent current, allowing it to support low-power, always-on operation. Both controllers support wide duty-cycles for switching frequencies from 200kHz to 2.2MHz. Both devices can be synchronized to an external clock and offer programmable spread spectrum clocking to mitigate EMI.

In pre-boost buck mode, the boost of the ISL78263 can be set to activate during falling VIN transients and continues to operate with an input voltage down to 2.1V. This allows the buck output to maintain regulation, even as the VIN voltage falls below its output. To support the increase in input current that occurs when VIN falls, the ISL78263 integrates robust MOSFET drivers to allow the use of multiple FETs in parallel.

ISL78263 is qualified to AEC-Q100 Grade 1 and is specified to operate across an ambient temperature range of -40°C to 125°C. The device is available in a 5mmx5mm, 32 Ld WFQFN (Wettable Flank) package. The features of the ISL78263 make it ideally suited as a front-end regulator for automotive systems that must maintain always-on operation and support severe cold-cranking transients.

KEY FEATURES

  • VIN operating range: 2.1 to 42V
  • Low quiescent current: 6µA typical, buck channel
  • Switching frequency: 200kHz to 2.2MHz
  • Boost frequency at 1x or 0.2x the buck frequency
  • Dropout mode (buck) for high duty-cycle operation
  • 25ns on-times for low duty-cycle operation
  • External synchronization
  • Programmable spread spectrum clocking
  • 2A Sourcing / 3A sinking MOSFET drivers
  • Boot UV and programmable boot refresh time
  • Extensive protection mechanisms for OV/UV/OC/OT
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    APPLICATIONS

  • Automotive battery supplied application
  • In cabin systems
  • ADAS: Advanced Driver Assist Systems
  • Start-stop protected systems (such as head unit, cluster, e-Mirror)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL78263
Basic Information
Production Status
Mass Production
# of Outputs
2
Topology [Rail 1]
Buck
Input Voltage Min (V) [Rail 1]
3.5
Input Voltage Max (V) [Rail 1]
42
Output Voltage Min (V) [Rail 1]
0.8
Output Voltage Max (V) [Rail 1]
5
Output Current 1 Max (A)
10
Topology [Rail 2]
Boost
Input Voltage Min (V) [Rail 2]
2.1
Input Voltage Max (V) [Rail 2]
42
Output Voltage Min (V) [Rail 2]
5
Output Voltage Max (V) [Rail 2]
40
Output Current 2 Max (A)
2
Switching Frequency (kHz)
200 to 2200 (Buck), Boost is 1x or 0.2x of Buck
Bias Voltage (VCC) (V)
5
Temperature Range
-40 to +125

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