A4410中文资料Adjustable Frequency Buck or Buck/Boost Pre-Regulator with a Synchronous Buck, 3 Internal LDOs, Window Watchdog Timer, and NPOR数据手册Allegro规格书

描述 Description

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. 

Applications

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, 2017Recommended Substitutions: For existing customer transition, and for new customers or new applications,use A4408KLVTR-T.

特性 Features

• 2.8 VIN to 36 VIN operating range, 40 VIN maximum
• Adjustable PWM switching frequency: 250 kHz to 2.4 MHz
• 1.25 V / 750 mADC / 1 APEAK synchronous buck (1V25)
• 5 V (V5P) internal tracking LDO regulator with fold back short circuit and short-to-battery protections
• Power-on reset with fixed delay of 15 ms for 1V25/3V3 UV and OV protection (NPOR)
• Active low, watchdog timer enable/disable pin (WDENn)
• PowerOK output for V5/V5P UV and OV (POK5V)
• Two ignition enable inputs (ENBAT1 and ENBAT2)
• SLEW rate control pin helps reduce EMI/EMC
• OV and UV protection for all four CPU supply rails
• Thermal shutdown protection
• -40°C to 150°C junction temperature range