Low I Synchronous Step-Down Controller

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.

Comparison of LTC3835 and LTC3835-1

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.

* 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