LTC1159IS-5#PBF

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Analog Devices Inc./Maxim Integrated

HIGH EFFICIENCY SYNCHRONOUS STEP-DOWN SWITCHING REGULATORS

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LTC1159IS-5#PBF

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Analog Devices Inc./Maxim Integrated

HIGH EFFICIENCY SYNCHRONOUS STEP-DOWN SWITCHING REGULATORS

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC1159 Series

The LTC1159 series is a family of synchronous step-down switching regulator controllers featuring automatic Burst Mode™operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.A separate pin and on-board switch allow the MOSFET driver power to be derived from the regulated output voltage providing significant efficiency improvement when operating at high input voltages. The constant off-time current-mode architecture maintains constant ripple current in the inductor and provides excellent line and load transient response. The output current level is user programmable via an external current sense resistor.The LTC1159 automatically switches to power saving Burst Mode operation when load current drops below approximately 15% of maximum current. Standby current is only 300µA while still regulating the output and shutdown current is a low 20µA.ApplicationsStep-Down and Inverting RegulatorsNotebook and Palmtop ComputersPortable InstrumentsBattery-Operated Digital DevicesIndustrial Power DistributionAvionics SystemsTelecom Power Supplies

Technical Specifications

Parameters and characteristics for this part

Specification	LTC1159IS-5#PBF

Clock Sync	No
Control Features	Enable, Current Limit
Duty Cycle (Max)	100 %
Frequency - Switching (Max)	250 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	85 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive or Negative, Positive, Negative
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	40 V
Voltage - Supply (Vcc/Vdd) Minimum	4 V

LTC1159 Series

Part	Package Name	Operating Temperature (Min)	Operating Temperature (Max)	Output Configuration	Duty Cycle (Max)	Topology	Control Features	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Output Phases	Number of Outputs	Function	Frequency - Switching (Max)	Package Width	Package Length	Output Type	Synchronous Rectifier	Mounting Type	Clock Sync
Analog Devices Inc./Maxim Integrated LTC1159CS#TRPBF	16-SO 16-SOIC	0 °C	70 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	3.9 mm	0.154 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159CG-5#TRPBF	20-SSOP	0 °C	70 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	5.3 mm	0.209 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159CS-3.3#TRPBF	16-SO 16-SOIC	0 °C	70 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	3.9 mm	0.154 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159CG-5#PBF	20-SSOP	0 °C	70 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	5.3 mm	0.209 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159CG#PBF	20-SSOP	0 °C	70 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	5.3 mm	0.209 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159IS-5#PBF	16-SO 16-SOIC	-40 °C	85 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	3.9 mm	0.154 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159CG-3.3#PBF	20-SSOP	0 °C	70 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	5.3 mm	0.209 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159IS-5#TRPBF	16-SO 16-SOIC	-40 °C	85 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	3.9 mm	0.154 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159CS#PBF	16-SO 16-SOIC	0 °C	70 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	3.9 mm	0.154 in	Transistor Driver	Yes	Surface Mount	No
Analog Devices Inc./Maxim Integrated LTC1159CS-5#PBF	16-SO 16-SOIC	0 °C	70 °C	Negative Positive Positive or Negative	100 %	Buck	Current Limit Enable	4 V	40 V	1	1	Step-Down	250 kHz	3.9 mm	0.154 in	Transistor Driver	Yes	Surface Mount	No

Pricing

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CAD

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Documents

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R245 Reliability Data

LTC1159IS-5#PBF | Datasheet