MAX608

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

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


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.
MAX608: Typical Operating Circuit MAX608: Typical Operating Circuit Enlarge+

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
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. Method Switch Type ICC
(mA)
Shutdown Mode Supply Current
(µA)
DC-DC Outputs Oper. Freq.
(kHz)
Package/Pins Budgetary
Price
min max min max max typ max See Notes
MAX608  1.8 16.5 3 16.5 5 1 Resistor External 0.085 5 1 300
PDIP(N)/8
SOIC(N)/8
$1.99 @1k
See All Step-Up Switching Regulators (92)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX608EVKIT: Evaluation Kit for the MAX608

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