Features and Benefits
- Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
- Ultralow Operating IQ: 30µA (One Channel On)
- Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- OPTI-LOOP® Compensation Minimizes COUT
- ±1% Output Voltage Accuracy
- Wide VIN Range: 4V to 36V Operation
- Phase-Lockable Fixed Frequency 140kHz to 650kHz
- Selectable Continuous, Pulse Skipping or Low Ripple Burst Mode® Operation at Light Loads
- Dual N-Channel MOSFET Synchronous Drive
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Output Voltage Soft-Start or Tracking
- Output Current Foldback Limiting
- Power Good Output Voltage Monitor
- Output Overvoltage Protection
- Low Shutdown IQ: 4µA
- Internal LDO Powers Gate Drive from VIN or VOUT
- Small 5mm × 5mm QFN Package
The LTC3826 is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 650kHz. Power loss and noise due to the ESR of the input capacitor are minimized by operating the two controller output stages out of phase.
The 30μA no-load quiescent current extends operating life in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3826 features a precision 0.8V reference and a power good output indicator. A wide 4V to 36V input supply range encompasses all battery chemistries.
Independent TRACK/SS pins for each controller ramp the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions.
The PLLIN/MODE pin selects among Burst Mode operation, pulse skipping mode, or continuous inductor current mode at light loads. For a leaded package version (28-lead SSOP), see the LTC3826-1 data sheet.
||PolyPhase||Defeatable Current Foldback||Package|
- Automotive Systems
- Battery-Operated Digital Devices
- Distributed DC Power Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
DC1235A: Demo Board for the LTC3826 30µA IQ, Dual, 2-Phase Synchronous Step-Down Controller.
Documentation & Resources
R384 Reliability Data3/26/201818 K
DC1235A - Demo Manual9/24/2009366K
Tools & Simulations
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LTC3826EUH#PBF||Material Declaration||Reliability Data||32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)|
|LTC3826EUH#TRPBF||Material Declaration||Reliability Data||32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)|
|LTC3826IUH#PBF||Material Declaration||Reliability Data||32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)|
|LTC3826IUH#TRPBF||Material Declaration||Reliability Data||32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)|
|Wafer Fabrication Data||R384 Reliability Data|
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