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LTC3835: Low IQ Synchronous Step-Down Controller Data Sheet (Rev. F)10/2/2019PDF799 K
Overview
Features and Benefits
- Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
- Low Operating Quiescent Current: 80μA
- OPTI-LOOP® Compensation Minimizes COUT
- 1% Output Voltage Accuracy
- Wide VIN Range: 4V to 36V Operation
- Phase-Lockable Fixed Frequency 140kHz to 650kHz
- 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
- Clock Output for PolyPhase® Applications
- Output Overvoltage Protection
- Low Shutdown IQ: 10μA
- Internal LDO Powers Gate Drive from VIN or VOUT
- Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads
- Small 20-Lead TSSOP or 4mm × 5mm QFN Package
- AEC-Q100 Qualified for Automotive Applications
Product Details
The LTC3835 is a high performance step-down switching regulator controller that drives an all N-channel synchronous power MOSFET stage. A constant-frequency current mode architecture allows a phase-lockable frequency of up to 650kHz.
The 80μA 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 LTC3835 features a precision 0.8V reference and a power good output indicator. The 4V to 36V input supply range encompasses a wide range of battery chemistries.
The TRACK/SS pin ramps the output voltage during startup. Current foldback limits MOSFET heat dissipation during short-circuit conditions.
| PART # | CLKOUT/PHASMD | EXTVCC | PGOOD | PACKAGES |
| LTC3835 | Yes | Yes | Yes | FE20/4 × 5 QFN |
| LTC3835-1 | No | No | No | GN16/3 × 5 DFN |
Applications
- Automotive Systems
- Telecom Systems
- Battery-Operated Digital Devices
- Distributed DC Power Systems
All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5408150, 5481178, 5705919, 5929620, 6304066, 6498466, 6580258, 6611131.
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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)
Documentation & Resources
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R384 Reliability Data3/26/2018PDF18 K
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DC967B - Demo Manual5/3/2010PDF955K
Tools & Simulations
LTspice
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Step 2: Click on the link in the section below to download a demonstration circuit.
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Models for the following parts are available in LTspice:
LTC3835
LTC3835-1
Design Resources
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.