A8698ELJ-T

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Function:	Step-Down
Output Configuration:	Positive
Topology:	Buck
Output Type:	Adjustable
Number of Outputs:	1
Voltage - Input (Min):	8V
Voltage - Input (Max):	25V
Voltage - Output (Min/Fixed):	0.8V
Voltage - Output (Max):	20V
Current - Output:	3A
Frequency - Switching:	--
Synchronous Rectifier:	No
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Supplier Device Package:	8-SOIC-EP
Base Part Number:	A8698

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A8698ELJ-T application field and working principle

The A8698ELJ-T is a high speed, high-temperature, surface-mount step-down DC-DC switching regulator. The device is a non-synchronous buck regulator capable of providing up to 5 A of output current. It has an optimized on-time control of 4 µs, where the frequency is set by a resistor to median frequencies such as 500 kHz, and input voltages from 1.5-7 V.

Application field

The A8698ELJ-T is well suited for various portable applications such as PC cards, netbooks, portable media players, and other highly integrated, portable applications. It is an ideal device for battery-powered, medium to high current step-down applications requiring portability, compactness, and low power dissipation. It is also suitable for use in main power supplies, portable chargers, and automotive applications.

Working principle

The A8698ELJ-T is designed to provide high efficiency step-down regulated power supplies. It is a switched-mode regulator with a fixed switching frequency that is predetermined by an external resistor. The device has an internal synchronous rectifier topology with very low switch-on resistance for high efficiency.In operation, the output voltage is sensed and compared with a reference voltage to provide a control signal for the switch. For exceptional response, the device features a continuous-conduction control loop (CCC) with a built-in clock, allowing the device to run without an external clock signal. It senses when the load current reaches zero and shuts off the switch while keeping the output regulator on until the output current reaches its level again. This helps to reduce switching losses during light load and no load conditions.When the supply voltage is above the regulation voltage, the current-sense signal drives the switch\'s gate voltage low, preventing the switch from conducting. The switch is continuously turned on and off in order to maintain the output voltage at the desired level, while minimizing losses and minimizing any load transients. The output voltage is controlled to within a fixed voltage range depending on the external component values.

Conclusion

The A8698ELJ-T is a high-efficiency, high-temperature, surface-mount DC-DC switching regulator, capable of providing up to 5 A of output current. It is suitable for use in a wide range of portable applications including PC cards, netbooks, portable media players, and other highly integrated, portable applications. It has an optimized on-time control of 4 µs and provides excellent response with a continuously conducted control loop. This makes it an ideal solution for battery powered applications where compactness, low power dissipation and portability are of paramount importance.

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