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50mA, Regulated, Step-Down Charge Pump for 1.8V or 1.9V Logic

Product Details

Key Features

Parametric specs for Charge Pumps
Topology Regulated
VIN (V) (min) 2.7
VIN (V) (max) 5.5
IOUT (A) (typ) 0.05
Unadj. VOUT (V) 1.8
1.9
IQ (mA) (max) 0.15
Switching Frequency (kHz) 2000
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.61
View Less

Simplified Block Diagram

Technical Docs

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Sampling:
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Parameters

Parametric specs for Charge Pumps
Topology Regulated
VIN (V) (min) 2.7
VIN (V) (max) 5.5
IOUT (A) (typ) 0.05
Unadj. VOUT (V) 1.8
1.9
IQ (mA) (max) 0.15
Switching Frequency (kHz) 2000
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.61

Key Features

  • > 85% Peak Efficiency
  • 50mA Guaranteed Output Current
  • Dual-Mode 1.8V or 1.9V Output
  • ±3% Output Voltage Accuracy
  • Up to 2MHz Operating Frequency
  • Small 0.22µF Capacitors
  • No Inductor Required
  • 2.7V to 5.5V Input Voltage Range
  • Output Disconnects from Input in Shutdown Mode
  • Small 10-Pin µMAX Package (1.09mm max height)

Applications/Uses

  • Handheld Instruments (PDAs, Palmtops)
  • Low-Voltage Logic Supplies
  • PC Cards
  • PDAs
  • Wireless Handsets

Description

The MAX1730 regulated step-down charge pump generates up to 50mA at fixed output voltages of 1.8V or 1.9V from an input voltage in the 2.7V to 5.5V range. Specifically designed to provide high-efficiency logic supplies in applications that demand a compact design, the MAX1730 employs fractional conversion techniques to provide efficiency exceeding that of a linear regulator.

The MAX1730 operates at up to 2MHz, permitting the use of small 0.22µF flying capacitors while maintaining low 75µA quiescent supply current. Proprietary soft-start circuitry prevents excessive current from being drawn from the supply during startup, making the MAX1730 compatible with higher impedance sources such as alkaline and lithium-ion cells.

The MAX1730 is available in a space-saving 10-pin µMAX® package that is only 1.09mm high and occupies one-half the area of an 8-pin SO.

Simplified Block Diagram

MAX1730: Typical Operating Circuit MAX1730: 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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.