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Low Input/Output Voltage Step-Up DC-DC Converter with Active-Low RESET

Smallest 1.8V Output Step-Up Converter with True Shutdown for 1-/2-Cell Alkaline Handhelds

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 3.6
VOUT1 (V) (min) 1.8
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 0.25
Switch Type Internal
Preset VOUT (V) 3
Output Adjust. Method Preset
Power Good Signal Yes
Synchronous Switching? Yes
IQ (mA) (typ) 0.07
# DC-DC Outputs 1
Package/Pins TDFN/8
Budgetary
Price (See Notes)
1.86
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Simplified Block Diagram

Support & Training

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Sampling:
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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 0.7
VIN (V) (max) 3.6
VOUT1 (V) (min) 1.8
VOUT1 (V) (max) 3.3
IOUT1 (A) (max) 0.25
Switch Type Internal
Preset VOUT (V) 3
Output Adjust. Method Preset
Power Good Signal Yes
Synchronous Switching? Yes
IQ (mA) (typ) 0.07
# DC-DC Outputs 1
Package/Pins TDFN/8
Budgetary
Price (See Notes)
1.86

Key Features

  • Low Input (0.7V) and Output (1.8V) Voltage Capability
  • Internal Synchronous Rectifier
  • High 94% Efficiency
  • Fixed Output Voltages: 1.8V, 2.5V, 3V, and 3.3V
  • Up to 2MHz Switching Allows Small External Components and Low Output Ripple
  • Automatic Pulse Skipping at Light Loads for Extended Battery Life
  • Low 70µA (typ) Operating Supply Current (Measured at OUT)
  • Low 2µA Logic-Controlled Shutdown
  • True Shutdown Fully Discharges Output to Ground
  • Uses Only Small Ceramic Capacitors
  • 75ms Active-Low RESET Output Flag

Applications/Uses

  • Cordless Phones
  • Digital Still Cameras
  • MP3 Players, Pagers, and CD Players
  • Other Battery-Powered Systems
  • PDAs and Organizers
  • Portable Medical Equipment
  • Wireless Mice/Keyboards

Description

The MAX1947 is a compact, high-efficiency, step-up DC-DC converter that regulates output voltages from 1.8V to 3.3V to power µP/DSP cores, memory, and I/O rails in 1-and 2-cell alkaline/NiMH/NiCd battery-powered systems. It features an internal 800mA switch and synchronous rectifier to achieve up to 94% efficiency and to eliminate the need for an external Schottky diode.

High-frequency switching (up to 2MHz) results in low ripple and small external components, while automatic pulse skipping at light loads reduces supply current to just 70µA for extended battery life. Maxim's proprietary True Shutdown™ reduces supply current to just 2µA and fully discharges the output to ground. The converter is offered in fixed-output voltages of 1.8V, 2.5V, 3.0V, and 3.3V, requiring no feedback or compensation network. A 75ms active-low RESET output flag provides for power-on reset (POR) and undervoltage detection. The MAX1947 is available in a space-saving 8-pin TDFN package.

Simplified Block Diagram

MAX1947: Typical Operating Circuit MAX1947: Typical Operating Circuit Zoom icon

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.