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Switching Voltage Regulators 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

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MAX861IUA+T General Description

The MAX860/MAX861 charge-pump voltage converters invert input voltages ranging from +1.5V to +5.5V, or double input voltages ranging from +2.5V to +5.5V. Because of their high switching frequencies, these devices use only two small, low-cost capacitors. Their 50mA output makes switching regulators unnecessary, eliminating inductors and their associated cost, size, and EMI. Greater than 90% efficiency over most of the load-current range, combined with a typical operating current of only 200μA (MAX860), provides ideal performance for both battery-powered and board-level voltage-conversion applications.

A frequency-control (FC) pin provides three switching-frequencies to optimize capacitor size and quiescent current and to prevent interference with sensitive circuitry. Each device has a unique set of three available frequencies. A shutdown (active-low SHDN) pin reduces current consumption to less than 1μA. The MAX860/MAX861 are suitable for use in applications where the ICL7660 and MAX660's switching frequencies are too low. The MAX860/MAX861 are available in 8-pin μMAX and SO packages.

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Key Features

  • 8-Pin, 1.11mm High μMAX Package
  • Invert or Double the Input Supply Voltage
  • Three Selectable Switching Frequencies
  • High Frequency Reduces Capacitor Size
  • 87% Efficiency at 50mA
  • 200μA Quiescent Current (MAX860)
  • 1μA Shutdown Supply Current
  • 600mV Voltage Drop at 50mA Load
  • 12Ω Output Resistance


  • Handheld Instruments (PDAs, Palmtops)
  • Interface Power Supplies
  • Medical Instruments
  • Operational Amplifier Power Supplies
  • Portable Computing


model MAX861IUA+T package Micro-MAX, Thin Shrink Small-Outline
packingQty Reel,2500 packingOption Reel
packageType U8+1 rohs roHSY
lifeCycle production tempRange -20 to 85C
Manufacturer Analog Devices Inc. Product Category Switching Voltage Regulators
RoHS Details Output Voltage - 5.5 V to - 1.5 V, 5 V to 11 V
Output Current 100 mA Input Voltage, Max 5.5 V
Number of Outputs 1 Output Topology Boost, Inverting
Package / Case uMAX-8 Mounting Style SMD/SMT
Switching Frequency 250 kHz Minimum Operating Temperature - 25 C
Maximum Operating Temperature + 85 C Series MAX861
Input Voltage, Min 1.5 V Brand Analog Devices / Maxim Integrated
Input Voltage 1.5 V to 5.5 V Operating Supply Current 2.5 mA
Product Type Switching Voltage Regulators Shutdown Shutdown
Factory Pack Quantity 2500 Subcategory PMIC - Power Management ICs
Type Switched Capacitor Voltage Converter Part # Aliases MAX861
Unit Weight 0.000847 oz
MAX860, MAX861: Typical Operating Circuit

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