Low I Synchronous Step-Down Controller

The LTC3835-1 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 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 LTC3835-1 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

CLKOUT/PHASMD

EXTVCC

PGOOD

Package

LTC3835

Yes

Yes

Yes

TSSOP-20, 4x5 QFN-20

LTC3835-1

No

No

No

GN-16, 3x5 DFN-16

Applications

* Automotive Systems

* Telecom Systems

* Battery-Operated Digital Devices

* Distributed DC Power Systems

* Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V

* Low Operating IQ: 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