Top

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

High-Efficiency Even at Low Input Voltages and Noise Reduction

Product Details

Key Features

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 16.5
VOUT1 (V) (min) 2
VOUT1 (V) (max) 100
IOUT1 (A) (max) 2
Switch Type External
Preset VOUT (V) 12
Output Adjust. Method Preset
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)
2.28
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 16.5
VOUT1 (V) (min) 2
VOUT1 (V) (max) 100
IOUT1 (A) (max) 2
Switch Type External
Preset VOUT (V) 12
Output Adjust. Method Preset
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)
2.28
View Less

Simplified Block Diagram

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.

Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2
VIN (V) (max) 16.5
VOUT1 (V) (min) 2
VOUT1 (V) (max) 100
IOUT1 (A) (max) 2
Switch Type External
Preset VOUT (V) 12
Output Adjust. Method Preset
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)
2.28

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

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 110&microA 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.

Simplified Block Diagram

MAX1771: Typical Operating Circuit MAX1771: 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.