MAX1771

12V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controller

High-Efficiency Even at Low Input Voltages and Noise Reduction


Description

The MAX1771 step-up switching controller provides 90% efficiency over a 30mA to 2A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives this device the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters).

This controller uses miniature external components. Its high switching frequency (up to 300kHz) allows surface-mount magnetics of 5mm height and 9mm diameter. It accepts input voltages from 2V to 16.5V. The output voltage is preset at 12V, or can be adjusted using two resistors.

The MAX1771 optimizes efficiency at low input voltages and reduces noise by using a single 100mV current-limit threshold under all load conditions. A family of similar devices, the MAX770-MAX773, trades some full-load efficiency for greater current-limit accuracy; they provide a 200mV current limit at full load, and switch to 100mV for light loads.

The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs. An evaluation kit is available.
MAX1771: Typical Operating Circuit MAX1771: Typical Operating Circuit Enlarge+

Key Features

  • 90% Efficiency for 30mA to 2A Load Currents
  • Up to 24W Output Power
  • 110µA (max) Supply Current
  • 5µA (max) Shutdown Current
  • 2V to 16.5V Input Range
  • Preset 12V or Adjustable Output Voltage
  • Current-Limited PFM Control Scheme
  • Up to 300kHz Switching Frequency
  • Evaluation Kit Available

Applications/Uses

  • Battery-Powered Applications
  • Flash Memory Programming
  • High-Power RF Power-Amplifier Supply
  • Palmtops/Handheld Terminals
  • 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
MAX1771  2 16.5 2 100 12 2
Preset
Resistor
External 0.085 5 1 300
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$1.91 @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.


MAX1771EVKIT: Evaluation Kit for the MAX1771

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