LTC3835-1 Series

Low IQSynchronous Step-Down Controller

Catalog

Low IQSynchronous Step-Down Controller

Part	Duty Cycle (Max) [Max]	Operating Temperature [Max]	Operating Temperature [Min]	Number of Outputs	Function	Control Features	Output Configuration	Output Type	Supplier Device Package	Frequency - Switching [Min]	Frequency - Switching [Max]	Package / Case	Topology	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Phases	Mounting Type	Package / Case	Package / Case
Analog Devices LTC3835IDHC-1#PBF	99.4 %	85 °C	-40 °C	1	Step-Down	Enable Soft Start Tracking	Positive	Transistor Driver	16-DFN (5x3)	250 kHz	530 kHz	16-WFDFN Exposed Pad	Buck	4 V	36 V	1	Surface Mount
Analog Devices LTC3835EDHC-1#PBF	99.4 %	85 °C	-40 °C	1	Step-Down	Enable Soft Start Tracking	Positive	Transistor Driver	16-DFN (5x3)	250 kHz	530 kHz	16-WFDFN Exposed Pad	Buck	4 V	36 V	1	Surface Mount
Analog Devices LTC3835IDHC-1#TRPBF	99.4 %	85 °C	-40 °C	1	Step-Down	Enable Soft Start Tracking	Positive	Transistor Driver	16-DFN (5x3)	250 kHz	530 kHz	16-WFDFN Exposed Pad	Buck	4 V	36 V	1	Surface Mount
Analog Devices LTC3835IGN-1#TRPBF	99.4 %	85 °C	-40 °C	1	Step-Down	Enable Soft Start Tracking	Positive	Transistor Driver	16-SSOP	250 kHz	530 kHz	16-SSOP	Buck	4 V	36 V	1	Surface Mount	0.154 in	3.9 mm

Catalog

Low IQSynchronous Step-Down Controller

Key Features

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

• Low Operating IQ: 80µA

• OPTI-LOOP®Compensation Minimizes COUT

• ±1% Output Voltage Accuracy

• Wide VINRange: 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

• Output Overvoltage Protection

• Low Shutdown IQ: 10µA

• Selectable Continuous, Pulse-Skipping or Burst Mode®Operation at Light Loads

• Small 16-Lead Narrow SSOP or 3mm × 5mm DFN Package

Description

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.CLKOUT/PHASMDEXTVCCPGOODPackageLTC3835YesYesYesTSSOP-20, 4x5 QFN-20LTC3835-1NoNoNoGN-16, 3x5 DFN-16ApplicationsAutomotive SystemsTelecom SystemsBattery-Operated Digital DevicesDistributed DC Power Systems