MAX608EPA

Frequency - Switching:	Up to 300kHz
Base Part Number:	MAX608
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	1.8 V ~ 16.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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The MAX608EPA is a monolithic DC-DC switching controller that emphasizes simplicity and reliability, providing up to 200mA with <2µA supply current. It operates from input voltages as low as 1.2V and produces 12Voutputs from as low as 0.8V input. The device is available in the space-saving 6-pin SOT-23 package, making it especially suitable for the small profile and fast-paced market of battery-based solutions.

Applications of MAX608EPA

The MAX608EPA finds usage in many applications, including portable devices such as mobile phones, digital still cameras, PDAs, cell phones and laptop computers. Other applications include embedded systems, industrial telemetry and instrumentation, automotive, and low-voltage analog and digital systems.

Working Principle

The MAX608EPA is a synchronous DC-DC converter designed to produce a 12V output voltage from an input voltage as low as 0.8V. It provides up to 200mA of output current and features a two-wire control-and-sense bus (SET and OPERATE) to facilitate external programming. When commanded on by a logic high on the OPERATE pin, a high-side switch is activated, raising the power switch node voltage to the input voltage supply. The voltage on the SET pin then sets the power switch off-time. When the power switch node reaches the set voltage, the MAX608EPA turns off the high-side switch and terminates the on-time until the next OPERATE command is received.

Voltage Regulation

The MAX608EPA features an integrated voltage feedback loop to regulate the output voltage. The voltage feedback loop maintains a constant output voltage during line transients, load transients, and temperature fluctuations. Its loop is fast enough to maintain stability with most ceramic output capacitors.

Synchronous Rectification

In addition to its internal feedback loop, the MAX608EPA includes a low on-resistance, 5V high-side n-channel power switch. To ensure low power dissipation from the power switch, the device includes a high-side N-channel MOSFET with a low RDS (ON), operating up to a 20V input voltage range. It also uses an efficient synchronous rectification technique, eliminating the need for an external Schottky diode. Furthermore, low power dissipation is maintained by controlling the power switch off-time with thevoltage on the SET pin.

PCB Design Considerations

When designing a board using the MAX608EPA, it is important to pay attention to a few key design considerations. First and foremost are the layout of the power supply and the power switch. When routing the power supply traces and the power switch, separate grounds should be used. This helps to reduce the amount of noise pickup on the power switch node while keeping the power supply traces away from other circuit elements that could cause interference. Additionally, it is important to minimize the power dissipation of the power switch and ensure that maximum output current capability is achieved. This can be accomplished by using a proper-sized inductor, output capacitor, and output voltage ripple. In summary, the MAX608EPA is a compact, space-saving monolithic DC-DC switching controller. Its integrated voltage feedback loop provides stable output voltage regulation, and its efficient synchronous rectification eliminates the need for an external Schottky diode. With its low operating voltage of 1.2V and 200mA output capacity, it is suitable for many applications, including portable devices, embedded systems, and industrial applications. Careful attention should be paid to the layout of the power supply and the power switch to achieve maximum output current capability and reduce power dissipation.

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