Diodes Incorporated
New Product Announcement
AP74502Q / AP74502HQ
80V Low IQ Ideal Diode Controller Provides Enhanced Protection Against Reverse Battery and Overvoltage in 48V Systems
The automotive-compliant AP74502Q and AP74502HQ provide a simple, cost-effective protection solution for reverse-polarity and overvoltage conditions.
They drive two external back-to-back N-channel MOSFETs which, coupled with their OVLO pin, provide input overvoltage protection as well as limited inrush current control.
The AP74502Q has a peak gate drive source capability of 60µA, which provides a longer turn-on time and hence, inrush current limitation. The AP74502HQ has an 11mA peak gate drive source capacity.
The AP74502Q and AP74502HQ do not have reverse current blocking features and are suitable for input reverse polarity protection of loads that may return energy to the input supply. This includes automotive body control module motor loads.
The products' wide supply input range of 3.2V to 75V supports RVP and overvoltage protection in existing 12V and 24V battery systems, as well as the growing 48V automotive battery systems utilized in xEV vehicles. Their 3.2V operation capability ensures correct operation even in the severe cold-cranking conditions within automotive systems.
The AP74502Q and AP74502HQ are available in the industry-standard SOT28 package.
Automotive-compliant - AEC qualified, manufactured in sites certified to IATF 16949 supporting PPAP documents.
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The DIODES Advantage
The 80V-rated AP74502Q and AP74502HQ provide reverse battery polarity and overvoltage protection to increase robustness of off-battery automotive applications.
- 80V Maximum Input: Protects 12V, 24V, 48V battery systems from overvoltage conditions.
- Correct Operation Down 3.2V Across All Temperatures: Supports severe cold-crank requirement in automotive systems.
- Drives Back-to-Back External N-MOSFETs with Overvoltage Detection: Protects and isolates downstream systems from battery overvoltage conditions.
- Two Gate Drive Options: Provides targeted inrush current control.
- AEC-Q100 Grade 1 Qualified with 150°C Maximum Junction Temperature: Supports the -40°C to +125°C ambient temperature range.
Applications
Automotive reverse battery protection in:
- Body control modules
- Exterior lighting
- Infotainment
- USB charging
- Advanced driver assistance systems (ADAS)
Typical Application
A block diagram illustrates a typical application. A 48V battery connects to a TVS diode (SMCJ51CAQ) and input capacitor (CIN). The AP74502(H)Q controller receives the VIN signal. It drives two external N-channel MOSFETs (DMTH10H028SPSWQ, Q1 and Q2) connected in series. The controller has pins for GATE, SRC, VCAP, OVLO, EN/UVLO, and GND. An output capacitor (COUT) and a DC-DC regulator (AP68355Q, 80V 3.5A) are shown connected to the output.
Automotive-Compliant Ideal Diode Portfolio
| Part Number | Max. Voltage Rating | Operating Input Voltage | Peak-Gate Source Current | Io | Overvoltage Response Time | Ambient Temperature Range | Key Features* | Package |
|---|---|---|---|---|---|---|---|---|
| AP74502Q | -80 to +80 | 3.2 to 75 | 0.06 | 62 | 0.6 | -40 to +125 | RPP, OVP, Inrush current protection | SOT28 |
| AP74502HQ | -80 to +80 | 3.2 to 75 | 11 | 62 | 0.6 | -40 to +125 | RPP, OVP, Inrush current protection | SOT28 |
| AP74700AQ | -65 to +70 | 3.2 to 65 | 11 | 80 | - | -40 to +125 | RCP, RVP with 48V specifications | SOT26, SOT28, SO-8 |
| AP74700Q | -65 to +65 | 3.2 to 60 | 11 | 80 | - | -40 to +125 | RCP, RVP | SOT26 |
| AP74701Q | -33 to +65 | 3.2 to 60 | 11 | 80 | - | -40 to +125 | RCP, RVP with VDS-Clamp | SOT28 |
* RPP: Reverse Polarity Protection, OVP: Overvoltage Protection, RCP: Reverse Current Protection, RVP: Reverse Voltage Protection
Ordering Information
| Orderable Part Number | Compliance (Only Automotive Supports PPAP) | Package | Moisture Sensitivity | Quantity | Carrier |
|---|---|---|---|---|---|
| AP74502QTA8-7 | Automotive | SOT28 | MSL-1 | 3,000 | 7" Tape & Reel |
| AP74502HQTA8-7 | Automotive | SOT28 | MSL-1 | 3,000 | 7" Tape & Reel |
