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5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller

1A Step-Up Converter Boosts 2V Inputs with High-Efficiency

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 1.8
VIN (V) (max) 16.5
VOUT1 (V) (min) 3
VOUT1 (V) (max) 16.5
IOUT1 (A) (max) 1
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Resistor
IQ (mA) (typ) 0.085
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.22
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Simplified Block Diagram

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 1.8
VIN (V) (max) 16.5
VOUT1 (V) (min) 3
VOUT1 (V) (max) 16.5
IOUT1 (A) (max) 1
Switch Type External
Preset VOUT (V) 5
Output Adjust. Method Resistor
IQ (mA) (typ) 0.085
Shutdown Mode Supply Current (µA) (max) 5
# DC-DC Outputs 1
Switching Frequency (kHz) 300
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
2.22

Key Features

  • 1.8V to 16.5V Input Range
  • 85% Efficiency for 30mA to 1.5A Load Currents
  • Up to 10W Output Power
  • 110µA Max Supply Current
  • 5µA Max Shutdown Current
  • Preset 5V or Adjustable Output (3V to 16.5V)
  • Current-Limited PFM Control Scheme
  • Up to 300kHz Switching Frequency
  • Evaluation Kit Available

Applications/Uses

  • Battery-Powered Applications
  • High-Efficiency DC-DC Converters
  • Portable Communicators
  • Positive LCD-Bias Generators

Description

The MAX608 low-voltage step-up controller operates from a 1.8V to 16.5V input voltage range. Pulse-frequency-modulation (PFM) control provides high efficiency at heavy loads, while using only 85µA (typical) when operating with no load. In addition, a logic-controlled shutdown mode reduces supply current to 2µA typical. The output voltage is factory-set at 5V or can be adjusted from 3V to 16.5V with an external resistor divider.

The MAX608 is ideal for two- and three-cell battery-powered systems. An operating frequency of up to 300kHz allows use with small surface-mount components.

The MAX608 operates in "bootstrapped" mode only (with the chip supply, OUT, connected to the DC-DC output). For a 12V output without external resistors, or for nonbootstrapped applications (chip supply connected to input voltage), refer to the pin-compatible MAX1771. The MAX608 is available in 8-pin DIP and SO packages.

Simplified Block Diagram

MAX608: Typical Operating Circuit MAX608: 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 .