A4410: Adjustable Frequency Buck or Buck/Boost Pre-Regulator with a Synchronous Buck, 3 Internal LDOs, Window Watchdog Timer, and NPOR


The A4410 is a power management IC that uses a buck or buck/boost pre-regulator to efficiently convert automotive battery voltages into a tightly regulated intermediate voltage complete with control, diagnostics, and protections. The output of the pre-regulator supplies a 5 V / 250 mAMAX tracking/protected LDO, a 3.3 V / 160 mAMAX LDO, a 5 V / 150 mAMAX LDO, and a 1.25 V / 750 mADC / 1 APEAK synchronous buck regulator. Designed to supply CAN or microprocessor power supplies in high temperature environments, the A4410 is ideal for under hood applications.

Enable inputs to the A4410 include a logic level (ENB) and two high-voltage (ENBAT1 and ENBAT2). The A4410 provides flexibility by including a TRACK pin to set the reference of the tracking regulator to either the 5 V or the 3.3 V output, so the A4410 can be adapted across multiple platforms with different sensors and supply rails.

Diagnostic outputs from the A4410 include a power-on-reset output (NPOR) with a fixed 15 ms delay, an ENBAT1 and ENBAT2 status outputs, and a PowerOK output for the 5 V and 5 V protected LDOs (POK5V). Dual bandgaps, one for regulation and one for fault checking, improve long-term reliability of the A4410.

The A4410 contains a Window Watchdog timer that can be programmed to accept a wide range of clock frequencies (WDADJ). The watchdog timer has a fixed 30 ms activation delay to accommodate processor startup. The watchdog timer has an enable/disable pin (active LOW, WDENn) to facilitate initial factory programming or field re-flash programming.

Protection features include under and over voltage lockout on all four CPU supply rails. In case of a shorted output, all linear regulators feature fold back over current protection. In addition, the V5P output is protected from a short-to-battery event. Both switching regulators include pulse-by-pulse current limit, hiccup mode short circuit protection, LX short circuit protection, missing asynchronous diode protection (VREG only) and thermal shutdown. The A4410 is supplied in a low profile, 38-lead eTSSOP package (suffix “LV”) with exposed power pad. 


  • Electronic Power Steering (EPS)
  • Transmission Control (TCU)
  • Advanced Braking Systems (ABS)
  • Emissions Control Modules
  • Other automotive applications

These parts are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Date of status change: June 5, 2017

Recommended Substitutions: For existing customer transition, and for new customers or new applications, use A4408KLVTR-T.

Top Features

  • Automotive AEC-Q100 qualified
  • 2.8 VIN to 36 VIN operating range, 40 VIN maximum
  • Buck or buck/boost pre-regulator (VREG)
  • Adjustable PWM switching frequency: 250 kHz to 2.4 MHz
  • PWM frequency can be synchronized to external clock
  • 1.25 V / 750 mADC / 1 APEAK synchronous buck (1V25)
  • 3.3 V (3V3) and 5 V (V5) internal LDO regulators with fold back short circuit protections
  • 5 V (V5P) internal tracking LDO regulator with fold back short circuit and short-to-battery protections
  • TRACK sets either 3V3 or V5 as the reference for V5P
  • Power-on reset with fixed delay of 15 ms for 1V25/3V3 UV and OV protection (NPOR)
  • Programmable watchdog timer with a 30 ms activation delay
  • Active low, watchdog timer enable/disable pin (WDENn)
  • Dual band gaps for increased reliability: BGVREF, BGFAULT
  • PowerOK output for V5/V5P UV and OV (POK5V)
  • Logic enable input (ENB) for microprocessor control
  • Two ignition enable inputs (ENBAT1 and ENBAT2)
  • ENBAT1 and ENBAT2 status indicator outputs
  • SLEW rate control pin helps reduce EMI/EMC
  • Frequency dithering helps reduce EMI/EMC
  • OV and UV protection for all four CPU supply rails
  • Pin-to-pin and pin-to-ground tolerant at every pin
  • Thermal shutdown protection
  • -40°C to 150°C junction temperature range

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
APEK4410KLV-01-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Distributor Stock
A4410KLVTR-T 38-lead TSSOP -40°C to 135°C Yes View Data pre-EOL Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.