30μA I Synchronous Step-Down Controller

The LTC3834-1 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 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 LTC3834-1 features a precision 0.8V reference . The 4V to 36V input supply range encompasses a wide range of battery chemistries.

The TRACK/SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. An enhanced feature set part (LTC3834) is available.

PHASMD

EXTVCC

PGOOD

PACKAGES

LTC3834

Yes

Yes

Yes

FE20/4mm × 5mm QFN

LTC3834-1

No

No

No

GN16/3mm × 5mm DFN

Applications

* Automotive Systems

* Telecom Systems

* Battery-Operated Digital Devices

* Distributed DC Power Systems

* Wide Output Voltage Range: 0.8V VOUT 10V

* Low Operating IQ: 30μA

* OPTI-LOOP® Compensation Minimizes COUT

* ±1% Output Voltage Accuracy

* Wide VIN Range: 4V to 36V

* Phase-Lockable Fixed Frequency 140kHz to 650kHz

* Dual N-Channel MOSFET Synchronous Drive

* Very Low Dropout Operation: 99% Duty Cycle