LTC1435ACS#PBF

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Analog Devices Inc./Maxim Integrated

HIGH EFFICIENCY LOW NOISE SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR

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LTC1435ACS#PBF

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Analog Devices Inc./Maxim Integrated

HIGH EFFICIENCY LOW NOISE SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC1435A Series

The LTC1435A is a synchronous step-down switching regulator controller that drives external N-channel power MOSFETs using a fixed frequency architecture. A wide duty cycle range of 5% to 99% allows high VINto low VOUTDC/DC conversion, as well as low dropout operation that extends operating time in battery-operated systems. Burst Mode™operation provides high efficiency at low load currents.The operating frequency is set by an external capacitor allowing maximum flexibility in optimizing efficiency. A secondary winding feedback control pin, SFB, guarantees regulation regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited when the SFB pin is pulled low, which reduces noise and RF interference.Soft start is provided by an external capacitor that can be used to properly sequence supplies. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 30V (36V maximum).ApplicationsNotebook and Palmtop Computers, PDAsCellular Telephones and Wireless ModemsPortable InstrumentsBattery-Operated DevicesDC Power Distribution Systems

Technical Specifications

Parameters and characteristics for this part

Specification	LTC1435ACS#PBF

Clock Sync	No
Control Features	Soft Start, Enable
Duty Cycle (Max)	99 %
Frequency - Switching (Max)	400 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	70 °C
Operating Temperature (Min)	0 °C
Output Configuration	Positive
Output Phases	1
Output Type	Transistor Driver
Package Length	0.154 in
Package Name	16-SOIC, 16-SO
Package Width	3.9 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Supply (Vcc/Vdd) Maximum	30 V
Voltage - Supply (Vcc/Vdd) Minimum	3.5 V

LTC1435A Series

Part	Operating Temperature (Max)	Operating Temperature (Min)	Control Features	Synchronous Rectifier	Package Name	Number of Outputs	Output Phases	Output Type	Frequency - Switching (Max)	Topology	Function	Duty Cycle (Max)	Output Configuration	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Mounting Type	Package Width	Package Length	Clock Sync
Analog Devices Inc./Maxim Integrated LTC1435AIS#TRPBF	85 °C	-40 °C	Enable Soft Start	Yes	16-SO 16-SOIC	1	1	Transistor Driver	400 kHz	Buck	Step-Down	99 %	Positive	30 V	3.5 V	Surface Mount	3.9 mm	0.154 in	No
Analog Devices Inc./Maxim Integrated LTC1435AIG#TRPBF	85 °C	-40 °C	Enable Soft Start	Yes	16-SSOP	1	1	Transistor Driver	400 kHz	Buck	Step-Down	99 %	Positive	30 V	3.5 V	Surface Mount	5.3 mm	0.209 in	No
Analog Devices Inc./Maxim Integrated LTC1435ACS#TRPBF	70 °C	0 °C	Enable Soft Start	Yes	16-SO 16-SOIC	1	1	Transistor Driver	400 kHz	Buck	Step-Down	99 %	Positive	30 V	3.5 V	Surface Mount	3.9 mm	0.154 in	No
Analog Devices Inc./Maxim Integrated LTC1435ACG#TRPBF	70 °C	0 °C	Enable Soft Start	Yes	16-SSOP	1	1	Transistor Driver	400 kHz	Buck	Step-Down	99 %	Positive	30 V	3.5 V	Surface Mount	5.3 mm	0.209 in	No
Analog Devices Inc./Maxim Integrated LTC1435ACG#PBF	70 °C	0 °C	Enable Soft Start	Yes	16-SSOP	1	1	Transistor Driver	400 kHz	Buck	Step-Down	99 %	Positive	30 V	3.5 V	Surface Mount	5.3 mm	0.209 in	No
Analog Devices Inc./Maxim Integrated LTC1435AIG#PBF	85 °C	-40 °C	Enable Soft Start	Yes	16-SSOP	1	1	Transistor Driver	400 kHz	Buck	Step-Down	99 %	Positive	30 V	3.5 V	Surface Mount	5.3 mm	0.209 in	No
Analog Devices Inc./Maxim Integrated LTC1435AIS#PBF	85 °C	-40 °C	Enable Soft Start	Yes	16-SO 16-SOIC	1	1	Transistor Driver	400 kHz	Buck	Step-Down	99 %	Positive	30 V	3.5 V	Surface Mount	3.9 mm	0.154 in	No
Analog Devices Inc./Maxim Integrated LTC1435ACS#PBF	70 °C	0 °C	Enable Soft Start	Yes	16-SO 16-SOIC	1	1	Transistor Driver	400 kHz	Buck	Step-Down	99 %	Positive	30 V	3.5 V	Surface Mount	3.9 mm	0.154 in	No

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LTC1435ACS#PBF | Datasheet

R393 Reliability Data