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  • MAX660 Switched Capacitor Voltage Converter

    • SNOS405B November   1999  – May 2017 MAX660

      PRODUCTION DATA.  

  • CONTENTS
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  • MAX660 Switched Capacitor Voltage Converter
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 MAX660 Test Circuit
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Voltage Inverter
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Capacitor Selection
          2. 9.2.1.2.2 Paralleling Devices
          3. 9.2.1.2.3 Cascading Devices
          4. 9.2.1.2.4 Regulating Output Voltage
        3. 9.2.1.3 Application Curves
      2. 9.2.2 Positive Voltage Doubler
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
    3. 9.3 Split V+ in Half
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • D|8
    • MSOI002K
Thermal pad, mechanical data (Package|Pins)
Orderable Information
  • snos405b_oa
  • snos405b_pm
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DATA SHEET

MAX660 Switched Capacitor Voltage Converter

1 Features

  • Inverts or Doubles Input Supply Voltage
  • Narrow SO-8 Package
  • 6.5-Ω Typical Output Resistance
  • 88% Typical Conversion Efficiency at 100 mA
  • Selectable Oscillator Frequency: 10 kHz/80 kHz

2 Applications

  • Laptop Computers
  • Cellular Phones
  • Medical Instruments
  • Operational Amplifier Power Supplies
  • Interface Power Supplies
  • Handheld Instruments

3 Description

The MAX660 CMOS charge-pump voltage converter is a versatile unregulated switched-capacitor inverter or doubler. Operating from a wide 1.5-V to 5.5-V supply voltage, the MAX660 uses two low-cost capacitors to provide 100 mA of output current without the cost, size and EMI related to inductor-based converters. With an operating current of only 120 µA and operating efficiency greater than 90% at most loads, the MAX660 provides ideal performance for battery-powered systems. MAX660 devices can be operated directly in parallel to lower output impedance, thus providing more current at a given voltage.

The FC (frequency control) pin selects between a nominal 10-kHz or 80-kHz oscillator frequency. The oscillator frequency can be lowered by adding an external capacitor to the OSC pin. Also, the OSC pin may be used to drive the MAX660 with an external clock up to 150 kHz. Through these methods, output ripple frequency and harmonics may be controlled.

Additionally, the MAX660 may be configured to divide a positive input voltage precisely in half. In this mode, input voltages as high as 11 V may be used.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
MAX660 SOIC (8) 4.90 mm × 3.91 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Voltage Inverter

MAX660 10089801.png

Positive Voltage Doubler

MAX660 10089802.png

4 Revision History

Changes from A Revision (October 2016) to B Revision

  • Changed Figure 5 caption from "Efficiency vs Oscillator Frequency" to "Efficiency vs Load Current" Go

Changes from * Revision (SNOS405) to A Revision

  • Added additional info to DescriptionDevice Information and Pin Configuration and Functions sections, ESD Ratings and Thermal Information tables, Feature Description, Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and Mechanical, Packaging, and Orderable Information sectionsGo
  • Deleted obsolete device number information from Device Comparison table Go
  • Deleted lead temperature spec from Abs Max as it is in POA Go
  • Added additional thermal values; changed RθJA from "170°C/W" to "114.4°C/W"Go
  • Changed "PL" to "PM" and "PF" to PJ" - manufacturers changed their part number prefix Go
  • Changed "Sprague" to "Vishay Sprague" per website Go

5 Pin Configuration and Functions

D Package
8-Pin SOIC
Top View
MAX660 10089805.png

Pin Functions

PIN I/O DESCRIPTION
NAME NO. VOLTAGE INVERTER VOLTAGE DOUBLER
CAP+ 2 Power Connect this pin to the positive terminal of charge-pump capacitor. Same as inverter
CAP– 4 Power Connect this pin to the negative terminal of charge-pump capacitor. Same as inverter
FC 1 Input Frequency control for internal oscillator:
FC = open, ƒOSC = 10 kHz (typical);
FC = V+, ƒOSC = 80 kHz (typical);
FC has no effect when OSC pin is driven externally		 Same as inverter
GND 3 Ground Power supply ground input. Power supply positive voltage input
LV 6 Input Low-voltage operation input. Tie LV to GND when input voltage is less than 3.5 V. Above 3.5 V, LV can be connected to GND or left open. When driving OSC with an external clock, LV must be connected to GND. LV must be tied to OUT.
OSC 7 Input Oscillator control input. OSC is connected to an internal 15-pF capacitor. An external capacitor can be connected to slow the oscillator. Also, an external clock can be used to drive OSC. Same as inverter except that OSC cannot be driven by an external clock
OUT 5 Power Negative voltage output Positive supply ground input
V+ 8 Power Power supply positive voltage input Positive voltage output

 
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