LT1374 Series

4.5A, 500kHz Step-Down Switching Regulator

Catalog

4.5A, 500kHz Step-Down Switching Regulator

Part	Voltage - Input (Max) [Max]	Frequency - Switching	Topology	Supplier Device Package	Voltage - Output (Min/Fixed)	Mounting Type	Output Configuration	Voltage - Output (Max) [Max]	Voltage - Input (Min) [Min]	Package / Case	Package / Case [y]	Package / Case [x]	Function	Operating Temperature [Min]	Operating Temperature [Max]	Output Type	Number of Outputs	Output Type	Package / Case [custom]	Package / Case [custom]
Analog Devices LT1374HVIS8#TRPBF	32 V	500 kHz	Buck SEPIC	8-SO	2.42 V	Surface Mount	Positive	27.52 V	5 V	8-SOIC	3.9 mm	0.154 in	Step-Down	-40 °C	125 ¯C	Adjustable	1
Analog Devices LT1374IR#TRPBF	25 V	500 kHz	Buck SEPIC	DDPAK-7	2.42 V	Surface Mount	Positive	21.5 V	5 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA			Step-Down	-40 °C	125 ¯C	Adjustable	1
Analog Devices LT1374IS8-5#PBF	25 V	500 kHz	Buck SEPIC	8-SO	5 V	Surface Mount	Positive		5 V	8-SOIC	3.9 mm	0.154 in	Step-Down	-40 °C	125 ¯C		1	1.81 mOhm
Analog Devices LT1374IS8-SYNC#PBF	25 V	500 kHz	Buck SEPIC	8-SO	2.42 V	Surface Mount	Positive	21.5 V	5 V	8-SOIC	3.9 mm	0.154 in	Step-Down	-40 °C	125 ¯C	Adjustable	1
Analog Devices LT1374HVCS8#TRPBF	32 V	500 kHz	Buck SEPIC	8-SO	2.42 V	Surface Mount	Positive	27.52 V	5 V	8-SOIC	3.9 mm	0.154 in	Step-Down	0 °C	125 ¯C	Adjustable	1
Analog Devices LT1374CS8#PBF	25 V	500 kHz	Buck SEPIC	8-SO	2.42 V	Surface Mount	Positive	21.5 V	5 V	8-SOIC	3.9 mm	0.154 in	Step-Down	0 °C	125 ¯C	Adjustable	1
Analog Devices LT1374HVCFE#TRPBF	32 V	500 kHz	Buck SEPIC	16-TSSOP-EP	2.42 V	Surface Mount	Positive	27.52 V	5 V	16-TSSOP Exposed Pad			Step-Down	0 °C	125 ¯C	Adjustable	1		0.173 "	4.4 mm
Analog Devices LT1374IR#PBF	25 V	500 kHz	Buck SEPIC	DDPAK-7	2.42 V	Surface Mount	Positive	21.5 V	5 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA			Step-Down	-40 °C	125 ¯C	Adjustable	1
Analog Devices LT1374IR-5#PBF	25 V	500 kHz	Buck SEPIC	DDPAK-7	5 V	Surface Mount	Positive		5 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA			Step-Down	-40 °C	125 ¯C		1	1.81 mOhm
Analog Devices LT1374CR-5#TRPBF	25 V	500 kHz	Buck SEPIC	DDPAK-7	5 V	Surface Mount	Positive		5 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA			Step-Down	0 °C	125 ¯C		1	1.81 mOhm

Key Features

• Constant 500kHz Switching Frequency

• High Power 16-Pin TSSOP Package Available

• Uses All Surface Mount Components

• Inductor Size Reduced to 1.8µH

• Saturating Switch Design: 0.07Ω

• Effective Supply Current: 2.5mA

• Shutdown Current: 20µA

• Cycle-by-Cycle Current Limiting

• Easily Synchronizable

Description

The LT1374 is a 500kHz monolithic buck mode switching regulator. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available.A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch.The LT1374 is available in standard 7-pin DD, TO-220, fused lead SO-8 and 16-pin exposed pad TSSOP packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts may be used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20µA. Synchronization allows an external logic level signal to increase the internal oscillator from 580kHz to 1MHz.ApplicationsPortable ComputersBattery-Powered SystemsBattery ChargersDistributed Power