LT1506 Series

4.5A, 500kHz Step-Down Switching Regulator

Catalog

4.5A, 500kHz Step-Down Switching Regulator

Part	Supplier Device Package	Topology	Current - Output	Number of Outputs	Output Type	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Input (Max) [Max]	Voltage - Output (Min/Fixed)	Package / Case	Function	Output Configuration	Frequency - Switching	Mounting Type	Voltage - Input (Min) [Min]	Voltage - Output (Max) [Max]	Output Type	Package / Case [y]	Package / Case [x]
Analog Devices LT1506IR-3.3SYNC#TRPBF	DDPAK-7	Buck	4.5 A	1	1.81 mOhm	-40 °C	125 ¯C	15 V	3.3 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Step-Down	Positive	500 kHz	Surface Mount	4 V
Analog Devices LT1506CR-SYNC#PBF	DDPAK-7	Buck	4.5 A	1		0 °C	125 ¯C	15 V	2.42 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Step-Down	Positive	500 kHz	Surface Mount	4 V	13.95 V	Adjustable
Analog Devices LT1506IR-SYNC#PBF	DDPAK-7	Buck	4.5 A	1		-40 °C	125 ¯C	15 V	2.42 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Step-Down	Positive	500 kHz	Surface Mount	4 V	13.95 V	Adjustable
Analog Devices LT1506CS8-3.3#PBF	8-SO	Buck	4.5 A	1	1.81 mOhm	0 °C	125 ¯C	15 V	3.3 V	8-SOIC	Step-Down	Positive	500 kHz	Surface Mount	4 V			3.9 mm	0.154 in
Analog Devices LT1506CR#PBF	DDPAK-7	Buck	4.5 A	1		0 °C	125 ¯C	15 V	2.42 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Step-Down	Positive	500 kHz	Surface Mount	4 V	13.95 V	Adjustable
Analog Devices LT1506IR-3.3#PBF	DDPAK-7	Buck	4.5 A	1	1.81 mOhm	-40 °C	125 ¯C	15 V	3.3 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Step-Down	Positive	500 kHz	Surface Mount	4 V
Analog Devices LT1506CR-3.3#TRPBF	DDPAK-7	Buck	4.5 A	1	1.81 mOhm	0 °C	125 ¯C	15 V	3.3 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Step-Down	Positive	500 kHz	Surface Mount	4 V
Analog Devices LT1506CR-3.3SYNC#PBF	DDPAK-7	Buck	4.5 A	1	1.81 mOhm	0 °C	125 ¯C	15 V	3.3 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Step-Down	Positive	500 kHz	Surface Mount	4 V
Analog Devices LT1506IS8#PBF	8-SO	Buck	4.5 A	1		-40 °C	125 ¯C	15 V	2.42 V	8-SOIC	Step-Down	Positive	500 kHz	Surface Mount	4 V	13.95 V	Adjustable	3.9 mm	0.154 in
Analog Devices LT1506CR-3.3SYNC#TRPBF	DDPAK-7	Buck	4.5 A	1	1.81 mOhm	0 °C	125 ¯C	15 V	3.3 V	D2PAK (7 Leads + Tab) TO-263-8 TO-263CA	Step-Down	Positive	500 kHz	Surface Mount	4 V

Catalog

4.5A, 500kHz Step-Down Switching Regulator

Key Features

• Constant 500kHz Switching Frequency

• Easily Synchronizable

• Operates with Input as Low as 4V

• Uses All Surface Mount Components

• Inductor Size Reduced to 1.8µH

• Saturating Switch Design: 0.07Ω

• Shutdown Current: 20µA

• Cycle-by-Cycle Current Limiting

Description

The LT1506 is a 500kHz monolithic buck mode switching regulator functionally identical to the LT1374 but optimized for lower input voltage applications. It will operate over a 4V to 15V input range compared with 5.5V to 25V for the LT1374. 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 keeping quiescent supply current to 4mA and by utilizing a supply boost capacitor to saturate the power switch.The LT1506 fits into standard 7-pin DD and fused lead SO-8 packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are 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 ChargerDistributed Power