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MAX40203
Ultra-Tiny nanoPower, 1A Ideal Diodes
with Ultra-Low-Voltage Drop
General Description
The MAX40203 is an ideal diode current-switch with
forward voltage drop that is approximately an order
of magnitude smaller than that of Schottky diodes.
When forward biased and enabled, the MAX40203
conducts with 90mV of voltage drop while carrying
currents as high as 1A. During a short-circuit or a fast
power-up, the device limits its output current to 2A. The
MAX40203 thermally protects itself and any downstream
circuitry from overcurrent conditions.
This ideal diode operates from a supply voltage of 1.2V
to 5.5V. The supply current is relatively constant with load
current, and is typically 300nA. When disabled (EN = low),
the ideal diode blocks voltages up to 6V in either direction,
makes it suitable for use in most low-voltage, portable
electronic devices.
The MAX40203 is available in a tiny, 0.77mm x 0.77mm,
4-bump WLP, with a 0.35mm bump pitch and a 5-pin
SOT-23 package. It is specified over the automotive
-40°C to +125°C temperature range.
Applications
●● Notebook and Tablet Computers
●● Battery Backup Systems
●● Powerline Fault Recorders
●● Cellular Phones
●● Electronic Toys
●● USB-Powered Peripherals
●● Portable Medical Devices
Benefits and Features
●● Lower Voltage Drop in Portable Applications
• 14mV Forward Drop at 1mA (WLP)
• 16mV Forward Drop at 100mA (WLP)
• 43mV Forward Drop at 500mA (WLP)
• 90mV Forward Drop at 1A (WLP)
●● Longer Battery Life
• Low Leakage When Reverse-Biased from VDD:
• 10nA (Typ)
• Low Supply Quiescent Current
• 300nA (Typ), 500nA (Max)
●● Smaller Footprint Than Larger Schottky Diodes
• Tiny 0.77mm x 0.77mm 4-Bump WLP
• SOT23-5 Package
●● Wide Supply Voltage Range: 1.2V to 5.5V
●● Thermally Self-Protecting
●● -40°C to +125°C Operating Temperature Range
Ordering Information appears at end of data sheet.
Simplified Block Diagram
VDD OUT
EN
GND
19-100354; Rev 1; 3/19
