Summary of LT8613 – 42V, 6A Synchronous Step-Down Regulator with Current Sense and 3μA Quiescent Current
The LT8613 is a compact, high-efficiency, synchronous monolithic step-down regulator supporting 3.4V–42V input, up to 6A, and ultralow 3μA quiescent current. It offers rail-to-rail current sensing with monitor, fast 40ns switch-on, low 250mV dropout at 3A, selectable 200kHz–2.2MHz switching, internal compensation, output soft-start/tracking, and a thermally enhanced 3mm × 6mm 28-lead QFN package.
Parts used in the LT8613 Project:
- LT8613 synchronous step-down regulator IC
- Input capacitor(s)
- Output capacitor(s)
- Inductor (small value, low DCR)
- Schottky or synchronous MOSFETs (internal in LT8613)
- Current sense resistor or current-sensing network (if external monitoring used)
- Feedback resistors for output voltage setting
- Soft-start and tracking components (as required)
- Switching node PCB layout and thermal vias
- 3mm × 6mm 28-lead QFN footprint and associated decoupling
Features
- Rail-to-Rail Current Sense Amplifier with Monitor
- Wide Input Voltage Range: 3.4V to 42V
- Ultralow Quiescent Current Burst Mode® Operation:
3μA IQ Regulating 12VIN to 3.3VOUT
Output Ripple <10mVP-P - High Efficiency Synchronous Operation:
95% Efficiency at 3A, 5VOUT from 12VIN
94% Efficiency at 3A, 3.3VOUT from 12VIN - Fast Minimum Switch-On Time: 40ns
- Low Dropout Under All Conditions: 250mV at 3A
- Allows Use Of Small Inductors
- Low EMI
- Adjustable and Synchronizable: 200kHz to 2.2MHz
- Current Mode Operation
- Accurate 1V Enable Pin Threshold
- Internal Compensation
- Output Soft-Start and Tracking
- Small Thermally Enhanced 3mm × 6mm 28-Lead QFN Package
Typical Application
Description
The LT®8613 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 3μA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components.
For more detail: LT8613 – 42V, 6A Synchronous Step-Down Regulator with Current Sense and 3μA Quiescent Current
- What input voltage range does the LT8613 support?
The LT8613 supports a wide input voltage range of 3.4V to 42V. - How low is the quiescent current in burst mode operation?
The LT8613 consumes 3μA of quiescent current in Burst Mode operation when regulating 12VIN to 3.3VOUT. - What efficiency can be expected at 3A output?
Typical efficiency is 95% at 3A, 5VOUT from 12VIN and 94% at 3A, 3.3VOUT from 12VIN. - What is the minimum switch-on time?
The LT8613 has a fast minimum switch-on time of 40ns. - What is the dropout voltage at 3A?
The device achieves a low dropout of 250mV at 3A. - Can the switching frequency be adjusted or synchronized?
Yes, the LT8613 is adjustable and synchronizable from 200kHz to 2.2MHz. - Does the LT8613 include current sensing?
Yes, it includes a rail-to-rail current sense amplifier with monitor. - Does the LT8613 provide internal compensation?
Yes, the LT8613 has internal compensation. - What package does the LT8613 come in?
The LT8613 is available in a thermally enhanced 3mm × 6mm 28-lead QFN package.
