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

Inductorless Inverter/Positive Doubler Switches Up to 250kHz

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Doubler
Inverter
Unregulated
VIN (V) (min) 1.5
VIN (V) (max) 5.5
IOUT (A) (typ) 0.05
Unadj. VOUT (V) +2xVIN
-VIN
IQ (mA) (max) 0.4
Switching Frequency (kHz) 250
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
1.3
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Simplified Block Diagram

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Parameters

Parametric specs for Charge Pumps
Topology Doubler
Inverter
Unregulated
VIN (V) (min) 1.5
VIN (V) (max) 5.5
IOUT (A) (typ) 0.05
Unadj. VOUT (V) +2xVIN
-VIN
IQ (mA) (max) 0.4
Switching Frequency (kHz) 250
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
1.3

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

Applications/Uses

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

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.

Simplified Block Diagram

MAX860, MAX861: Typical Operating Circuit MAX860, MAX861: Typical Operating Circuit 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 .