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Ultra-Tiny Nanopower, 1A Ideal Diodes with Ultra-Low-Voltage Drop

Current Switch/Ideal Diode Saves Space and Offers 10x Lower Voltage Drop Than Schottkys

Product Details

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 wafer-level package (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.

Also see: nanoPower Technology ›

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Key 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

Applications/Uses

  • Battery Backup Systems
  • Cellular Phones
  • Electronic Toys
  • Notebook and Tablet Computers
  • Portable Medical Devices
  • Powerline Fault Recorders
  • USB-Powered Peripherals
Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 100
Output Format Voltage
CMVR (V) (min) 1.5
CMVR (V) (max) 5.5
VCC (V) (min) 1.2
VCC (V) (max) 5.5
ICC (µA) (typ) 0.3
Bi-Dir. Curr. Sense Yes
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/5
THIN WLP/4
Budgetary
Price (See Notes)
$0.28 @1k
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Simplified Block Diagram

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Technical Docs

Design & Development

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Description

The MAX40203 evaluation kit (EV kit) provides a proven design to evaluate the MAX40203 “ideal-diode”. This EV kit demonstrates the MAX40203 in a space-saving 5-pin SOT23 (MAX40203AUK+). This EV kit can be used to evaluate the MAX40203AUK+ as well.

The MAX40203 EV kit PCB comes with two MAX40203AUK+ devices installed. The MAX40203 device is a current-switch, which drops so little voltage as to approximate an “ideal diode”.

The MAX40203 is also available in a tiny 0.8mm x 0.8mm 4-bump WLP with a 0.35mm bump pitch and has lower voltage drop. These devices operate over the automotive -40°C to +125°C temperature range.

View Details

Features

  • Drops Only 100mV at 500mA
  • Less than 10nA Leakage When Reverse-Biased From VDD
  • Supply Voltage Range: Between 1.2V and 5.5V
  • Low Supply Quiescent Current: 300nA (typ), 500nA (max)
  • Thermally Self-Protecting
  • -40 °C to +125 °C Temperature Range
  • Evaluates MAX40203AUK+
  • Accommodates Easy-to-Use Components
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX40203 WLP evaluation kit provides a proven design to evaluate the MAX40203 “ideal-diode”. This EV kit demonstrates the MAX40203 in a tiny 4-bump WLP (MAX40203ANS+).

The MAX40203 WLP EV kit PCB comes with two MAX40203ANS+ devices installed. The MAX40203 device is a current-switch, which drops so little voltage as to approximate an “ideal diode”.

View Details

Features

  • Drops Only 43mV at 500mA
  • Less than 10nA Leakage When Reverse-Biased From VDD
  • Supply Voltage Range: Between 1.2V and 5.5V
  • Low Supply Quiescent Current: 300nA (typ), 500nA (max)
  • Thermally Self-Protecting
  • -40°C to +125°C Temperature Range
  • Evaluates MAX40203ANS+
  • Accommodates Easy-to-Use Components
  • Proven PCB Layout
  • Fully Assembled and Tested

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SIMULATION MODELS

MAX40203 Orcad Library

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Support & Training

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Parameters

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 100
Output Format Voltage
CMVR (V) (min) 1.5
CMVR (V) (max) 5.5
VCC (V) (min) 1.2
VCC (V) (max) 5.5
ICC (µA) (typ) 0.3
Bi-Dir. Curr. Sense Yes
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/5
THIN WLP/4
Budgetary
Price (See Notes)
$0.28 @1k

Key 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

Applications/Uses

  • Battery Backup Systems
  • Cellular Phones
  • Electronic Toys
  • Notebook and Tablet Computers
  • Portable Medical Devices
  • Powerline Fault Recorders
  • USB-Powered Peripherals

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 wafer-level package (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.

Also see: nanoPower Technology ›

Mobile App

Simplified Block Diagram

MAX40203: Simplified Block Diagram MAX40203: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal