LTC3644/
LTC3644-2
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3644/
LTC3644-2

Quad 17V, 1.25A Parallelable Synchronous Step-Down Regulator with Ultralow Quiescent Current

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 8
1ku List Price Starting From $3.36
Features
  • Quad Step-down Outputs: 1.25A per Channel
  • Wide VIN Range: 2.7V to 17V
  • Wide VOUT Range: 0.6V to VIN
  • 1.25A/2.5A/3.75A/5A IOUT Configurable with One Inductor
  • Integrated 300mΩ P-Channel/80mΩ N-Channel MOSFETs Provide Up to 93% Efficiency
  • No-Load Burst Mode Operation IQ < 10µA with All Channels Enabled
  • Constant Frequency (1MHz/2.25MHz) with ±50% Frequency Synchronization Range
  • ±1% Output Voltage Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Full Dropout Operation (100% Duty Cycle)
  • Phase Shift Programmable with External Clock
  • 5mm × 5mm × 1.72mm BGA Package 
Additional Details
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The LTC3644/LTC3644-2 is a quad 1.25A output, high efficiency synchronous monolithic step-down regulator capable of operating from input supplies up to 17V. The switching frequency is internally fixed to 1MHz or 2.25MHz with a ±50% synchronization range. The regulator features ultralow quiescent current and high efficiency over a wide VIN and VOUT range.

The step-down regulator operates from an input voltage range of 2.7V to 17V and provides an adjustable output range from 0.6V to VIN while delivering up to 1.25A of output current per channel. LTC3644/LTC3644-2 can be configured for quad 1.25A outputs, triple 2.5A/1.25A/1.25A outputs, dual 2.5A outputs, or dual 3.75A/1.25A outputs. A user selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency; Burst Mode® operation provides the highest efficiency at light loads, while forced-continuous mode provides the lowest ripple noise. The regulators can be synchronized to an external clock.

Applications

  • Battery Powered Systems
  • Point-of-Load Supplies
  • Portable – Handheld Scanners and Cameras
Part Models 8
1ku List Price Starting From $3.36

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Documentation

Documentation

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Product Lifecycle

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Jul 21, 2021

- 21_0159

Ink Mark to Laser Mark Conversion for µModule

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- 21_0159

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC2383A-B

Quad 17V, 1.25A Synchronous Step-Down Regulator with Ultralow Quiescent Current

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DC2383A-B

Quad 17V, 1.25A Synchronous Step-Down Regulator with Ultralow Quiescent Current

Quad 17V, 1.25A Synchronous Step-Down Regulator with Ultralow Quiescent Current

Product Detail

Demonstration circuit 2383A-B features the LT3644-2: the wide input and output voltage range, high efficiency and power density, quad 1.25A outputs DC/DC synchronous step-down monolithic regulator. The input voltage range of DC2383A-A is 2.7V to 17V. The default demo board setting of VOUT1, VOUT2, VOUT3, VOUT4 is 1.2V, 3.3V, 2.5V, and 1.8V at 1.25A maximum DC output current per channel respectively. There are two assembly versions. The DC2383A-B features LTC3644-2 which operates at an internally fixed frequency of 2.25MHz (Typ), while the DC2383A-A features LTC3644 which operates at an internally fixed frequency of 1MHz (Typ). Peak current limit is internally fixed at 2.2A typical per channel. Each channel comes with independent run pin control and power good indicators. Phase shift selection of either 0 degree or 180 degrees between switch rising edge of channels 1, 2 and channels 3, 4 is also available.

DC2383A-B provides optional onboard 0Ω jumpers to configure the LTC3644-2 as 4-phase dual 2.5A/2.5A outputs or 4-phase triple 2.5A/1.25A/1.25A outputs. Optional 0Ω jumpers connecting VIN1 to VIN2, VIN3, and VIN4 are available for users to operate selected channels of LTC3644-2 at different input voltages than VIN1.

A user-selectable MODE/SYNC input is provided to allow users to trade off ripple noise for light load efficiency: pulse-skipping mode (PS) or Burst Mode® operation delivers higher efficiency at light load while forced continuous conduction mode (FCM) is preferred for noise sensitive applications. The MODE/SYNC pin can also be used to synchronize the switching frequency to an external clock or set the phase shift between channels 1, 2 and channels 3, 4. Constant frequency; peak current mode control architecture; and an integrated, internal control loop compensation network allow very fast transient responses to line and load changes while maintaining loop stability.

The LTC3644-2 is available in a thermally enhanced, low profile 36-lead 5mm × 5mm BGA package.

It is recommended to read the LTC3644-2 data sheet and demo board manual prior to using or making any changes to DC2383A-B.

reference details image

DC2383A-A

LTC3644 | Quad 17V, 1.25A Synchronous Step-Down Regulator with Ultralow Quiescent Current

zoom

DC2383A-A

LTC3644 | Quad 17V, 1.25A Synchronous Step-Down Regulator with Ultralow Quiescent Current

LTC3644 | Quad 17V, 1.25A Synchronous Step-Down Regulator with Ultralow Quiescent Current

Product Detail

Demonstration circuit 2383A-A features the LTC3644: the wide input and output voltage range, high efficiency and power density, quad 1.25A outputs DC/DC synchronous step-down monolithic regulator. The input voltage range of DC2383A-A is 2.7V to 17V. The default demo board setting of VOUT1, VOUT2, VOUT3, VOUT4 is 1.2V, 3.3V, 2.5V and 1.8V at 1.25A maximum DC output current per channel. There are two assembly versions. The DC2383A-A features LTC3644 which operates at an internally fixed frequency of 1MHz (Typ), while the DC2383A-B features LTC3644-2 which operates at an internally fixed frequency of 2.25MHz (Typ). Peak current limit is internally fixed at 2.2A typical per channel. Each channel comes with independent run pin control and power good indicators. Phase shift selection of either 0 degree or 180 degrees between switch rising edge of channels 1, 2 and channels 3, 4 is also available.

DC2383A-A provides optional onboard 0Ω jumpers to configure the LTC3644 as 4-phase dual 2.5A/2.5A outputs or 4-phase triple 2.5A/1.25A/1.25A outputs. Optional 0Ω jumpers connecting VIN1 to VIN2, VIN3, VIN4 are available for users to operate selected channels of LTC3644 at different input voltages than VIN1.

A user-selectable MODE/SYNC input is provided to allow users to trade off ripple noise for light load efficiency: pulse-skipping mode (PS) or Burst Mode® operation delivers higher efficiency at light load while forced continuous conduction mode (FCM) is preferred for noise sensitive applications. The MODE/SYNC pin can also be used to synchronize the switching frequency to an external clock or set the phase shift between channels 1, 2 and channels 3, 4. Constant frequency, peak current mode control architecture and integrated internal control loop compensation network, allows very fast transient response to line and load changes while maintaining loop stability.

The LTC3644 is available in a thermally enhanced, low profile 36-lead 5mm × 5mm BGA package.

It is recommended to read the data sheet and demo manual of LTC3644 prior to using or making any changes to DC2383A-A.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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