MAX40200AUK+

Part: MAX40200AUK+T — Maxim Integrated

Type: Ideal Diode Current Switch

Description: 1.5–5.5 V ideal diode current-switch with 18 mV typical forward turn-on threshold, up to 1 A continuous current, and thermal self-protection, available in 5-pin SOT23 and 4-bump WLP packages.

Operating Conditions:

• Supply voltage: 1.5–5.5 V
• Operating temperature: -40 to +125 °C
• Output capacitive load: 0.3–100 μF

Absolute Maximum Ratings:

• Any pin to GND: -0.3 V to +6 V
• Continuous current into EN: 10 mA
• Continuous current between VDD and OUT: 1.0 A (SOT23-5), 1.2 A (WLP)
• Max power dissipation: 312.6 mW (SOT, derate 3.90 mW/°C above +70 °C), 766 mW (WLP, derate 9.58 mW/°C above +70 °C)
• Storage temperature: -65 to +150 °C

Key Specs:

• Quiescent current (EN = VDD, no load): 7 μA typ, 18 μA max
• Shutdown quiescent current (EN = GND): 0.7 μA typ, 2.5 μA max
• Forward turn-on threshold (IFORWARD = 1 mA): 18 mV typ, 40 mV max
• SOT forward voltage at VDD = 3.3 V: 32 mV typ at 100 mA, 97 mV typ at 500 mA, 197 mV typ at 1 A (350 mV max, pulsed)
• WLP forward voltage at VDD = 3.3 V: 43 mV typ at 500 mA, 85 mV typ at 1 A
• Reverse operation current drawn from OUT (VOUT - VDD = 0.1 V): 1.2 μA typ, 3.5 μA max
• Thermal protection threshold: 154 °C, hysteresis 10 °C
• EN thresholds: 0.6 V max (low), 1.2 V min (high)
• Enable time: 65 μs typ; disable time: 1.6 ms typ

Features:

• Blocks voltages up to 6 V in either direction when disabled
• Thermally self-protecting
• Low reverse leakage
• Active-high enable input with weak internal pullup
• Replaces Schottky diodes with much lower voltage drop
• Not suited to AC rectification; intended for switching between DC sources

Applications:

• Notebook and tablet computers
• Portable media players
• Cellular phones
• Portable/wearable medical devices
• Electronic toys
• USB-powered peripherals

Package:

• 5-pin SOT23 (MAX40200AUK+, θJA 255.90 °C/W)
• 4-bump WLP, 0.73 mm x 0.73 mm, 0.35 mm pitch (MAX40200ANS+, θJA 104.41 °C/W)

• 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

• Notebook and Tablet Computers
• Portable Media Players
• Cellular Phones
• Portable/Wearable Medical Devices
• Electronic Toys
• USB-Powered Peripherals

Ordering Information appears at end of data sheet.

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MAX402

VDD = 3.3V, GND = 0V, EN = V DD , T A = -40°C to +125°C, unless otherwise noted. Typical values are at +25°C (Note 2)

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• Continuous Current Into EN...............................................10mA
• Continuous Current Flowing Between VDD and OUT (WLP Package) ................................................................1.2A
• Continuous current flowing between VDD and OUT (SOT23-5 Package)..........................................................1.0A
• Maximum Power Dissipation
• WLP, Derate 9.58mW/°C above +70°C.......................766mW
• SOT, Derate 3.90mW/°C above +70°C..................312.60mW

4 WLP

Stresses beyond those listed under 'Absolute Maximum Ratings' may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial .

Although the device is guaranteed for T A = -40°C to 125°C, care must be taken when using heavy loads (e.g., I FWD above 500mA to 1A) where the forward current across the ideal diode is large. The forward voltage drop across the VDD and OUT pins increases linearly with forward current. The device's power dissipation is directly proportional to the voltage drop across the device.

The power dissipation is going to be the differential voltage (V FWD ) multiplied by the current passed by the device (I FWD ). The quiescent current of the device is negligible for these calculations. The ambient temperature is essentially the PCB temperature, since this is where all the heat is sunk to. Therefore, the parts temperature rise is [V FWD x I FWD x θ JA ] + T A , where T A is the temperature of the board or ambient temperature. From this exercise, we observe that the internal temperature from power dissipation will be higher than the ambient temperature. The device has an internal thermal shutdown temperature of about +154°C and, typically, 12°C hysteresis.

For example:

WLP:

At 1A I FWD , T A = 85°C. V FWD = 110mV. Therefore, PDIS = 110mW.

Package Derate Calculation:

For 85°C: Maximum Power Dissipation from the data sheet: 766mW - [(85 - 70) x 9.58] = 622mW. The device is within specification. Therefore, the junction temperature: 85°C + (104.41°C/W x 0.110W) = 85°C + 11.5°C = 96.5°C

SOT-23 (Small Outline Transistor Package):

At 1A I FWD , TA = 85°C. V FWD = 250mV. Hence, PDIS = 250mW.

Package Derate Calculation:

For 85°C: Maximum Power Dissipation from the data sheet: 312.6mW - [(85 - 70)°C x 3.9mW/°C] = 254.1mW. The device is very close to the power dissipation ratings provided in the absolute maximum specification.

Hence the device's junction temperature: 85°C + (255.90°C/W x 0.2541W) = 85°C + 65.02°C = 150.02°C

As the above example shows, the thermal performance of the WLP exceeds the SOT package.

When the device's junction temperature rises to 154°C thermal trip is triggered, the thermal cycle for the WLP and SOT packages are shown in Figure 5 and Figure 6.

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For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . Note that a '+', '#', or '-' in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.