Power Management
Switching Regulator
Step-Down (Buck) Regulators
Multiple Output Buck
Power Management
Switching Regulator
Step-Down (Buck) Regulators
Micropower Buck
Power Management
Switching Regulator
Step-Down (Buck) Regulators
Poly-Phase Buck Controllers
Power Management
Switching Regulator
Step-Down (Buck) Regulators
External Power Switch Buck Controllers
LTC3826 - 30µA IQ, Dual, 2-Phase Synchronous Step-Down Controller
Features
- 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
Typical Application
Description
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.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-32
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC3826EG-1#PBF | SSOP | 28 | E | $7.69 | $5.38 | View |
| LTC3826EG-1#TRPBF | SSOP | 28 | E | $5.44 | View | |
| LTC3826EUH#PBF | QFN | 32 | E | $7.86 | $5.50 | View |
| LTC3826EUH#TR | QFN | 32 | E | $5.56 | View | |
| LTC3826EUH#TRPBF | QFN | 32 | E | $5.56 | View | |
| LTC3826IG-1#PBF | SSOP | 28 | I | $7.82 | $5.47 | View |
| LTC3826IG-1#TRPBF | SSOP | 28 | I | $5.53 | View | |
| LTC3826IUH#PBF | QFN | 32 | I | $7.99 | $5.59 | View |
| LTC3826IUH#TRPBF | QFN | 32 | I | $5.65 | View | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1235A | LTC3826EG| 30uA IQ, Dual, 2-Phase Synchronous Step-Down Controller | Contact Factory | |
| Buy Now | |||
Applications
- Automotive Systems
- Battery-Operated Digital Devices
- Distributed DC Power Systems
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Simulate
LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.
To launch a ready to run LTspice demonstration circuit for this part:
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To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Related models available in LTspice IV
LTC3826-1
LTC3826
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
