AEC-Q100 DC/DC Converters Allow Migration from 3A to 5A Without PCB Change
Intersil’s ISL78233/34/35 automotive DC/DC converters step-down 5V rails to POL for GPUs, FPGAs, DSPs and SOCs. The highly efficient devices deliver 3A, 4A and 5A of continuous output current to infotainment head units and Advanced Driver Assistance Systems (ADAS) employing forward-looking smart cameras to detect and classify objects.
The pin-compatible ISL78233/34/35 ICs allow you to make a simple BOM change and drop in the right device to your PCB to address the varying load requirements of entry-level to luxury car models.
- 2.7V to 5.5V input voltage range
- Very low ON-resistance FETs - P-channel 35mΩ and N-Channel 11mΩ typical values
- High efficiency synchronous buck regulator with up to 95% efficiency
- -1.2%/1% reference accuracy over temperature/load/line
- Complete BOM with as few as 3 external parts
- Internal soft-start - 1ms or adjustable
- Soft-stop output discharge during disable
- Adjustable frequency from 500kHz to 4MHz - default at 2MHz
- External synchronization up to 4MHz
- Over-temperature, overcurrent, overvoltage and negative overcurrent protection
- Shared common device pinout allows simplified output power upgrades over time
- Tiny 3mmx3mm TQFN package
- AEC-Q100 qualified
The ISL78233, ISL78234 are highly efficient, monolithic, synchronous step-down DC/DC converters that can deliver 3A (ISL78233), or 4A (ISL78234) of continuous output current from a 2.7V to 5.5V input supply. The devices use current mode control architecture to deliver a very low duty cycle operation at high frequency with fast transient response and excellent loop stability.
The ISL78233, ISL78234 integrate a very low ON-resistance P-channel (35mΩ) high-side FET and N-channel (11mΩ) low-side FET to maximize efficiency and minimize external component count. The 100% duty-cycle operation allows less than 200mV dropout voltage at 4A output current. The operation frequency of the Pulse Width Modulator (PWM) is adjustable from 500kHz to 4MHz. The default switching frequency of 2MHz is set by connecting the FS pin high.
The ISL78233, ISL78234 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference, while discontinuous mode provides higher efficiency by reducing switching losses at light loads.
Fault protection is provided by internal hiccup mode current limiting during short-circuit and overcurrent conditions. Other protection, such as overvoltage and over-temperature are also integrated into the device. A power-good output voltage monitor indicates when the output is in regulation.
The ISL78233, ISL78234 offers a 1ms Power-Good (PG) timer at power-up. When in shutdown, the ISL78233, ISL78234 discharges the output capacitor through an internal soft-stop switch. Other features include internal fixed or adjustable soft-start and internal/external compensation.
The ISL78233, ISL78234 is available in a 3mmx3mm 16 Ld Thin Quad Flat Pb-free (TQFN) package and in a 5mmx5mm 16 Ld Wettable Flank Quad Flat No-Lead (WFQFN) package with an exposed pad for improved thermal performance. The ISL78233, ISL78234 are rated to operate across the temperature range of -40°C to +125°C.
- DC/DC POL modules
- μC/μP, FPGA and DSP power
- Video processor/SOC power
- Li-ion battery powered devices
- Automotive infotainment power
|# of Outputs||1||1||1||1|
|VIN (min) (V)||2.7||2.7||2.7||2.7|
|VIN (max) (V)||5.5||5.5||5.5||5.5|
|VOUT (min) (V)||0.6||0.6||0.6||0.6|
|VOUT (max) (V)||5.5||5.5||5.5||5.5|
|IOUT (max) (A)||4||3||5||5|
|IQ||45 µA||45 µA||50 µA||50 µA|
|Switching Freq. (max)||4 MHz||4 MHz||4 MHz||4 MHz|
|Switching Freq. (min)||0.5 MHz||0.5 MHz||0.5 MHz||0.5 MHz|
|Max Duty Cycle (%)||100||100||100||100|
|Peak Efficiency (%)||95||95||95||95|
|BOM Total Footprint||141.9 mm2||141.9 mm2||141.9 mm2||141.9 mm2|
|Control Type||Current Mode||Current Mode||Current Mode||Current Mode|
|ISL78233, ISL78234 Datasheet|
3A and 4A Compact Synchronous Buck Regulators
07 Apr 2016
|07 Apr 2016||1 MB|
|ISL78234EVAL1Z Design Files|
BOM, Artwork and Schematic Files for the 3mm x 3mm TQFN ISL78234EVAL1Z Evaluation Board
12 Nov 2014
|ZIP||12 Nov 2014||710 KB|
|ISL78234EVAL2Z Design Files|
BOM, Artwork and Schematic Files for the 5mm x 5mm WFQFN ISL78234EVAL2Z Evaluation Board
08 Jan 2016
|ZIP||08 Jan 2016||723 KB|
|ISL7823xEVAL1Z User Guide|
ISL7823xEVAL1Z Evaluation Board User Guide
26 Oct 2016
|26 Oct 2016||706 KB|
|ISL7823xEVAL2Z User Guide|
5mm x 5mm WFQFN ISL7823xEVAL2Z Evaluation Board User Guide
08 Apr 2016
|08 Apr 2016||690 KB|
|Powering Automotive Cockpit Electronics|
02 May 2016
|02 May 2016||365 KB|