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High-Efficiency, Current-Mode, Inverting PWM Controller

Product Details

Key Features

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) -2
VOUT1 (V) (max) -200
IOUT1 (A) (max) 5
Switch Type External
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins UMAX/10
Budgetary
Price (See Notes)
3.16
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Simplified Block Diagram

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Parameters

Parametric specs for Inverting Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 16.5
VOUT1 (V) (min) -2
VOUT1 (V) (max) -200
IOUT1 (A) (max) 5
Switch Type External
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 500
Package/Pins UMAX/10
Budgetary
Price (See Notes)
3.16

Key Features

  • 90% Efficiency
  • +3.0V to +16.5V Input Range
  • -500mV to -200V Output
  • Drives High-Side P-channel MOSFET
  • 100kHz to 500kHz Switching Frequency
  • Current-Mode, PWM Control
  • Internal Soft-Start
  • Electrolytic or Ceramic Output Capacitor
  • The MAX1847 also offers:
    • Synchronization to External Clock Shutdown
    • N-Channel Inverting Flyback Option

Applications/Uses

  • Cellular Base Stations
  • CO DSL Line Driver Supplies
  • Industrial Power Supplies
  • Network Equipment
  • Optical Networking Equipment
  • Servers
  • SLIC Supplies
  • VOIP Supplies

Description

MAX1846/MAX1847 high-efficiency PWM inverting controllers allow designers to implement compact, low-noise, negative-output DC-DC converters for telecom and networking applications. Both devices operate from +3V to +16.5V input and generate -500mV to -200V output. To minimize switching noise, both devices feature a current-mode, constant-frequency PWM control scheme. The operating frequency can be set from 100kHz to 500kHz through a resistor.

The MAX1846 is available in an ultra-compact 10-pin µMAX® package. Operation at high frequency, compatibility with ceramic capacitors, and inverting topology without transformers allow for a compact design. Compatibility with electrolytic capacitors and flexibility to operate down to 100kHz allow users to minimize the cost of external components. The high-current output drivers are designed to drive a P-channel MOSFET and allow the converter to deliver up to 30W.

The MAX1847 features clock synchronization and shutdown functions. The MAX1847 can also be configured to operate as an inverting flyback controller with an N-channel MOSFET and a transformer to deliver up to 70W. The MAX1847 is available in a 16-pin QSOP package.

Current-mode control simplifies compensation and provides good transient response. Accurate current-mode control and over current protection are achieved through low-side current sensing.

Simplified Block Diagram

MAX1846, MAX1847: Functional Diagram MAX1846, MAX1847: Functional Diagram Zoom icon

Technical Docs

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.