A8449ST, A845, A8450 Selling Leads, Datasheet
MFG:ALLEGRO Package Cooled:SMD8 D/C:09+
A8449ST, A845, A8450 Datasheet download
Part Number: A8449ST
MFG: ALLEGRO
Package Cooled: SMD8
D/C: 09+
A8449ST, A845, A8450
- Table of contents:
Info of A8449ST
Info of A845
Info of A8450
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About A840
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Datasheet: A840
File Size: 67949 KB
Manufacturer: KEC [KEC(Korea Electronics)]
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About A8450
PDF/DataSheet Download
Datasheet: A8450
File Size: 562400 KB
Manufacturer: ALLEGRO [Allegro MicroSystems]
Download : Click here to Download
About A8450
PDF/DataSheet Download
Datasheet: A8450
File Size: 562400 KB
Manufacturer: ALLEGRO [Allegro MicroSystems]
Download : Click here to Download
A8450 General Description
The A8450 is a multioutput power supply intended for automotive applications. The A8450 operates from a wide input supply range and is designed to satisfy the requirements of high ambient temperature environments.
Four regulated voltage outputs provide multiple options. The 3.3 V regulator and the 1.2 to 3.3 V adjustable regulator can be used to power microcontroller or DSP cores, or for I/O, sensing, and A-to-D conversion. Two 5 V outputs, one digital and the other analog, feature output tracking within 0.5% of each other over the operating temperature range. In addition, the analog regulator is protected against short-to-battery conditions. All four regulators feature foldback current limit protection.
The device can be enabled or disabled using two input pins. The high voltage input, on the ENBAT pin, allows enable/disable using an engine ignition or battery switch signal. The logic-level input, on the ENB pin, allows enable/disable by microcontroller or DSP signals.
When disabled, the A8450 draws less than 10 µA of current. A POR (power-on-reset) block monitors the supply voltages and provides a reset signal, with an adjustable delay, for microcontroller or DSP resets. A separate fault pin signals TSD (thermal shutdown), 5 V analog short-to-supply, and 5 V analog or digital undervoltage.
The A8450 is supplied in a 24-pin SOIC package (part number suffix LB) with fused power ground pins for enhanced thermal performance. This provides an RθJA of 35°C/W on a 4-layer board.
A8450 Maximum Ratings
- 6 V to 45 V input range
- dc-to-dc buck converter with 5.7 V output
- Overcurrent protection with foldback, and undervoltage lockout
- Dual 5 V outputs
- Digital 5 V ±2%, 200 mA
- Analog 5 V, 200 mA
- Short-to-supply protection on analog regulator
- Analog to digital regulator output tracking < 0.5%, throughout operating temperature range
- 3.3 V linear regulator, with foldback current limit
- Adjustable 1.2 V to 3.3 V linear regulator, adjustable foldback
- Ignition switch enable; Sleep mode
- 100% duty cycle operation for low input voltages
- Power OK output
- -40°C to 135°C ambient operating temperature range
The A8450 is a multioutput power supply intended for automotive applications. The A8450 operates from a wide input supply range and is designed to satisfy the requirements of high ambient temperature environments.
Four regulated voltage outputs provide multiple options. The 3.3 V regulator and the 1.2 to 3.3 V adjustable regulator can be used to power microcontroller or DSP cores, or for I/O, sensing, and A-to-D conversion. Two 5 V outputs, one digital and the other analog, feature output tracking within 0.5% of each other over the operating temperature range. In addition, the analog regulator is protected against short-to-battery conditions. All four regulators feature foldback current limit protection.
The device can be enabled or disabled using two input pins. The high voltage input, on the ENBAT pin, allows enable/disable using an engine ignition or battery switch signal. The logic-level input, on the ENB pin, allows enable/disable by microcontroller or DSP signals.
When disabled, the A8450 draws less than 10 µA of current. A POR (power-on-reset) block monitors the supply voltages and provides a reset signal, with an adjustable delay, for microcontroller or DSP resets. A separate fault pin signals TSD (thermal shutdown), 5 V analog short-to-supply, and 5 V analog or digital undervoltage.
The A8450 is supplied in a 24-pin SOIC package (part number suffix LB) with fused power ground pins for enhanced thermal performance. This provides an RθJA of 35°C/W on a 4-layer board.
A8450 Features
`6 V to 45 V input range
`dc-to-dc buck converter with 5.7 V output
`Overcurrent protection with foldback, and undervoltage lockout (UVLO)
`Dual 5 V outputs
Digital 5 V ±2%, 200 mA
Analog 5 V, 200 mA
Short-to-supply protection on analog regulator
Analog to digital regulator output tracking < 0.5%, throughout operating temperature range
`3.3 V linear regulator, with foldback current limit
`Adjustable 1.2 V to 3.3 V linear regulator, adjustable foldback current limit
`Ignition switch enable; Sleep mode
`100% duty cycle operation for low input voltages
` Power OK output
40°C to 135°C ambient operating temperature range
`dc-to-dc buck converter with 5.7 V output
`Overcurrent protection with foldback, and undervoltage lockout (UVLO)
`Dual 5 V outputs
Digital 5 V ±2%, 200 mA
Analog 5 V, 200 mA
Short-to-supply protection on analog regulator
Analog to digital regulator output tracking < 0.5%, throughout operating temperature range
`3.3 V linear regulator, with foldback current limit
`Adjustable 1.2 V to 3.3 V linear regulator, adjustable foldback current limit
`Ignition switch enable; Sleep mode
`100% duty cycle operation for low input voltages
` Power OK output
40°C to 135°C ambient operating temperature range
A8450 Connection Diagram
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