MAX1651
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MAX1651

5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controller

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High-Efficiency Step-Down Controller Operates with 4 to 8 Cells

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Info: : PRODUCTION tooltip
Part Models 4
1ku List Price Starting From $3.01
Features
  • More than 90% Efficiency (10mA to 1.5A Loads)
  • More than 12.5W Output Power
  • Less than 0.3V Dropout Voltage at 500mA
  • 100µA Max Quiescent Supply Current
  • 5µA Max Shutdown Supply Current
  • 16V Max Input Voltage
  • 5V (MAX1649), 3.3V (MAX1651), or Adjustable Output Voltage
  • Current-Limited Control Scheme
  • Up to 300kHz Switching Frequency
  • Up to 96.5% Duty Cycle
Additional Details
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The MAX1649/MAX1651 BiCMOS, step-down, DC-DC switching controllers provide high efficiency over loads ranging from 1mA to more than 2.5A. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs. 2mA to 10mA for PWM converters). Dropout performance down to 300mV is provided by a high switch duty cycle (96.5%) and a low current-sense threshold (110mV).

A high switching frequency (up to 300kHz) allows these devices to use miniature external components.

The MAX1649/MAX1651 have dropout voltages less than 0.3V at 500mA and accept input voltages up to 16V. Output voltages are preset at 5V (MAX1649), or 3.3V (MAX1651). They can also be adjusted to any voltage from 1.5V to the input voltage by using two resistors.

These step-down controllers drive external P-channel MOSFETs at loads greater than 12.5W. If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs, which allow up to a 225mA load current.

Applications

  • 5V to 3.3V Green PC Applications
  • Battery-Powered Applications
  • High-Efficiency Step-Down Regulation
  • PDAs
Part Models 4
1ku List Price Starting From $3.01

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Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX1651CSA+
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MAX1651CSA+T
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MAX1651ESA+
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MAX1651ESA+T
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Filter by Model

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Part Models

Product Lifecycle

PCN

May 22, 2018

- 1702N

ASSEMBLY

MAX1651CSA+

PRODUCTION

MAX1651CSA+T

PRODUCTION

Oct 30, 2020

- 1702R2

ASSEMBLY

MAX1651ESA+

PRODUCTION

MAX1651ESA+T

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

May 22, 2018

- 1702N

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ASSEMBLY

MAX1651CSA+

PRODUCTION

MAX1651CSA+T

PRODUCTION

Oct 30, 2020

- 1702R2

arrow down

ASSEMBLY

MAX1651ESA+

PRODUCTION

MAX1651ESA+T

PRODUCTION

Software & Part Ecosystem

Evaluation Kits 1

MAX1649EVKIT

Evaluation Kit for the MAX649, MAX651, MAX652 and MAX1649, MAX1651

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MAX1649EVKIT

Evaluation Kit for the MAX649, MAX651, MAX652 and MAX1649, MAX1651

Evaluation Kit for the MAX649, MAX651, MAX652 and MAX1649, MAX1651

Features and Benefits

  • +5.5V to +16.5V Input Supply Range
  • Over 90% Efficiency for 10mA to 1.5A Loads
  • 100µA (max) Quiescent Supply Current
  • Fixed 5V or Optional Adjustable Output Voltage
  • 1.5A Output Current Capability
  • Fully Assembled and Tested

Product Detail

The MAX1649 evaluation kit (EV kit) provides a regulated 5V output voltage from a 5.5V to 16.5V source. The circuit is configured to deliver up to 1.5A of output current using all surface-mount components. The MAX1649's low quiescent current and unique current-limited PFM control scheme provide high efficiency over a wide range of load currents.

The MAX1649 EV kit can also be used to evaluate the MAX1651 (3.3V output), MAX649, MAX651, and MAX652. However, the MAX1649/MAX1651 are improved versions of the MAX649/MAX651, and are recommended for new designs.

Applications

  • 5V to 3.3V Green PC Applications
  • Battery-Powered Applications
  • High-Efficiency Step-Down Regulation
  • PDAs

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