The MAX40200 is an ideal diode current switch that drops so little voltage that it approaches an order of magnitude better than Schottky diodes.
When forward-biased and enabled, the MAX40200 conducts with as little as 85mV of voltage drop while carrying currents as high as 1A. Typical voltage drop is 43mV at 500mA, with the voltage drop increasing linearly at higher currents. The MAX40200 thermally protects itself, and any downstream circuitry, from overtemperature conditions.
When disabled (EN = low) the MAX40200 blocks voltages up to 6V in either direction, making it suitable for most low-voltage, portable electronic devices. The MAX40200 operates from a supply voltage of 1.5V to 5.5V.
The MAX40200 is available in a tiny, 0.73mm X 0.73mm, 4-bump wafer-level package (WLP), with a 0.35mm bump pitch and only 0.5mm high and 5-pin SOT-23 package.
The MAX40200 operates over the extended -40°C to +125°C temperature range.
MAX40200AUK+T Product Attributes:
Manufacturer : Analog Devices Inc./Maxim Integrated
Type : Source Selector Switch
FET Type : P-Channel
Ratio - Input:Output : 1:1
Internal Switch(s) : Yes
Delay Time - ON : 65 µs
Delay Time - OFF : 1.6 ms
Current - Output (Max) : 1.2A
Current - Supply : 7 µA
Voltage - Supply : 1.5V ~ 5.5V
Applications :
· Notebook and Tablet Computers
· Portable Media Players
· Cellular Phones
· Portable/Wearable Medical Devices
· Electronic Toys
· USB-Powered Peripherals
Applications Information :
Where the battery has to be disconnected from the load when the wall-supply is connected. Often, the wall-supply can handle the additional losses of a normal diode, so it would use a regular diode to prevent battery power from flowing back into it.
The battery, on the other hand, benefits significantly by only losing 30mV when powering the load, thus increasing the battery life between charging cycles.
For systems that require more than the 500mA that the MAX40200 is specified for, it may be convenient to split the load up into various sections that could also benefit from the individual power enabling that the MAX40200’s Enable pins offer.
This also suggests that any integrated circuit without builtin power-down capability can have it added by powering it through a MAX40200.
This allows many parts to be used in portable and other power-sensitive products.
Benefits and Features :
● Save Critical Voltage Drop in Portable Application
• Drops Less Than 43mV at 500mA; 85mV at 1A
● Longer Battery Life
• Low Leakage When Reverse-Biased: 70nA (Typ),1.5µA (Max)
• Low Supply Quiescent Current: 7µA (Typ), 18µA (Max)
● Saves Space Over Larger Schottky Diodes
• Tiny 0.73mm x 0.73mm 4-bump WLP
• SOT23-5 Package
● Supply Voltage Range 1.5V to 5.5V
● Thermally Self-Protecting
● -40°C to +125°C Temperature Range
Detailed Description :
The MAX40200 mimics a near-ideal diode. The device blocks reverse-voltages and passes current when forwardbiased just as a normal diode. The improvements are that instead of a cut-in voltage around 500mV and a logarithmic voltage-current transfer curve, the MAX40200 has a near constant voltage drop independent of the magnitude of the forward current flowing through it. This voltage drop is around 45mV at 500mA of forward or load current.
The constant forward voltage drop significantly helps with supply regulation; a normal diode typically drops an additional 60mV for every 10 times change in current through it.
Similar to a normal diode, the MAX40200 also becomes resistive as the forward current exceeds the specified limit. Unlike a normal diode, should the MAX40200 exceed the specified temperature, it will turn off in order to protect itself and the circuitry connected to it. Like a normal diode MAX40200 will turn-off when it is reverse biased. The turn-on and turn-off times for enable and disable responses are similar to those of forward and reverse bias conditions.
MAX40200 has an enable function feature. Unlike a normal diode the device can be turned off when not required.
When turned off, it blocks voltages on either side to a maximum of 6V above ground. This feature allows MAX40200 to be used, to switch supply sources, or to control which sub-systems are to be powered up.
It should be noted, however, that, unlike normal diodes, this “ideal diode” is not suited to rectifying AC. In applications where the supply is inductively coupled, conventional diodes should be used for the rectification part of the circuitry. MAX40200 is designed to be used in applications to switch between different DC sources.
Principle of Operation
The MAX40200 features an internal pMOSFET to pass the current from the VDD input to the OUT output. The internal MOSFET is controlled by circuitry that:
1) Creates the 18mV constant forward drop when the MAX40200 is forward-biased.
2) Turns the MOSFET off when the part is reverse-biased.
3) Turns the MOSFET off if the enable input is pulled low.
4) Turns the device off when the device temperature exceeds the thermal protection threshold.
This control circuitry consumes 7µA typical current and this limits the rate at which the internal MOSFET can be turned on/off.
To ensure the control loop remains stable for all output current levels, there should always be a minimum of 0.33µF connected to the OUT output and likewise, a minimum of 0.33µF on the VDD input.
These capacitors also improve the surge capability of power supply. In general for higher Output Capacitive Loads [e.g., COUT = 10µF], then CIN should be kept to COUT/10 (µF) for optimum transient response.
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