Allegro A8698, A8697 - 25 V INPUT, 3 OR 4 A STEP-DOWN REGULATORS
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The Allegro A8698 and A8697 are constant offtime current mode step-down regulators with a wide input voltage range. Regulation voltage is set by external resistors, to output voltages as low as 0.8 V.
These parts include an integrated power DMOS switch to reduce the total solution footprint. They also feature internal compensation, allowing users to design stable regulators with minimal design efforts.
As with all Allegro devices, the A869x devices boast a stable performance over the whole range of parameters, especially a flat efficiency curve across the full output current range.
The off-time can be set with an external resistor, allowing flexibility in inductor selection (see also Coilcraft Website).
Additionally, these devices have a logic level enable pin which can shut the device down and put it into a low quiescent current mode for power sensitive applications.
The A8698 and A8697 are supplied in a lowprofile 8-lead SOIC with exposed thermal pad (package LJ).
Features
- 8 to 25 V input voltage
- Very wide input range
- Integrated DMOS switch
- No external FET needed
- Adjustable fixed off-time
- User adjustability
- Adjustable 0.8 to 20 V output
- User adjustability
- High efficiency curve across output current
- Minimal change in efficiency across wide operating range
- 3 A (A8698) or 4 A (A8697) output in SOIC-8 package with exposed thermal pad
- High output current in small industry standard package footprint
- Internal compensation
- Minimizes number of external components required