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60mA, SOT23 Inverting Charge Pump with Shutdown

EMI-Friendly Ultra-Small Charge Pump

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Inverter
Unregulated
VIN (V) (min) 1.25
VIN (V) (max) 5.5
IOUT (A) (typ) 0.06
Unadj. VOUT (V) -VIN
IQ (mA) (max) 0.3
Switching Frequency (kHz) 250
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/6
Budgetary
Price (See Notes)
1.1
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Simplified Block Diagram

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Parameters

Parametric specs for Charge Pumps
Topology Inverter
Unregulated
VIN (V) (min) 1.25
VIN (V) (max) 5.5
IOUT (A) (typ) 0.06
Unadj. VOUT (V) -VIN
IQ (mA) (max) 0.3
Switching Frequency (kHz) 250
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/6
Budgetary
Price (See Notes)
1.1

Key Features

  • 60mA Output Current
  • Low 12Ω Output Resistance
  • 150µA Supply Current (MAX1697R)
  • Requires Only Two 1µF Capacitors (MAX1697U)
  • Start-Up Current Limited
  • +1.25V to +5.5V Input Voltage Range
  • Slew-Rate Limited to Reduce EMI

Applications/Uses

  • Battery-Operated Equipment
  • GaAsFET Bias Supplies
  • Handy-Terminals, PDAs
  • Negative Supply from +5V or +3.3V Logic Supplies
  • Small LCD Panels

Description

The MAX1697 ultra-small, monolithic, CMOS charge-pump voltage inverter accepts an input voltage ranging from +1.25V to +5.5V. This device features an ultra-low 12Ω output resistance, permitting loads of up to 60mA with maximum efficiency. The MAX1697 is available with operating frequencies of 12kHz, 35kHz, 125kHz, or 250kHz, allowing optimization of supply current or external component size. Its small external components and micropower shutdown mode make this device ideal for both battery-powered and board-level voltage conversion applications.

Oscillator control circuitry and four power MOSFET switches are included on-chip. Applications include generating a negative supply from a +5V or +3.3V logic supply to power analog circuitry. All versions come in a 6-pin SOT23 package and deliver 60mA.

For applications with lower current requirements, the MAX1719/MAX1720/MAX1721 are pin-compatible SOT23 charge pumps that supply up to 25mA.

Simplified Block Diagram

MAX1697: Typical Operating Circuit MAX1697: 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 .