Features and Benefits
- Wide VIN Range: 2.7V to 17V
- Wide VOUT Range: 0.6V to VIN
- 95% Max Efficiency
- Low IQ: 3.5μA, Zero-Current Shutdown
- Constant Frequency (1MHz/2.25MHz)
- Fixed VOUT Options Available
- Low Dropout Operation (100% Duty Cycle) with Ultralow IQ
- 2A Rated Output Current
- ±1% Output Voltage Accuracy
- Current Mode Operation for Excellent Line and Load Transient Response
- Synchronizable to External Clock
- Pulse-Skipping, Forced Continuous, Burst Mode® Operation
- Internal Compensation and Soft-Start
- Overtemperature Protection
- Compact 8-Lead DFN (3mm × 3mm) Package
The LTC3624/LTC3624-2 is a high efficiency 17V, 2A synchronous monolithic step-down regulator. The switching frequency is fixed to 1MHz (LTC3624) or 2.25MHz (LTC3624-2) with a ±40% synchronization range. The regulator features ultralow quiescent current and high efficiency over a wide 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 2A of output current. 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 pulse-skipping mode provides the lowest voltage ripple. The MODE pin can also be used to sync the switching frequency to an external clock.
- Battery Powered Equipment
- Portable Instrumentation
- Emergency Radios
- General Purpose Step-Down Supplies
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Demonstration circuit 2359A is a synchronous step-down regulator using LTC3624HMSE monolithic buck regulator in the MSOP-12E package. The DC2359A operates from an input voltage range of 2.7V to 17V and provides and jumper-selectable output voltage range from 1.2V to 5V (VOUT < VIN) at 2A of continuous output current. A user-selectable MODE input pin is provided with the following options: Burst Mode® operation provides the highest efficiency at light loads, while Pulse-Skipping mode (PS) provides the lowest output voltage ripples. Forced Continuous mode (FC) is also available for low EMI and noise interference.
Demonstration circuit DC2005A is a synchronous stepdown regulator using an LTC3624 monolithic buck regulator in the 3x3 DFN-8 package. The DC2005A operates from an input voltage range of 2.7V to 17V and provides an adjustable output voltage range from 1.2V to 5V (VOUT < VIN) at 2A of output current. A user-selectable MODE input pin is provided to allow the user to trade off ripple noise for light load efficiency.
Documentation & Resources
R539 Reliability Data3/26/2018165 K
DC2359A - Demo Manual10/8/2015478K
DC2005A - Demo Manual2/25/2014465K
Tools & Simulations
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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Models for the following parts are available in LTspice:
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
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Design tools for the following parts are available in LTpowerCAD:
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