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LT1501

Linear Technology
Part Number LT1501
Manufacturer Linear Technology
Description Adaptive-Frequency Current Mode Switching Regulators
Published Mar 22, 2005
Detailed Description LT1500/LT1501 Adaptive-Frequency Current Mode Switching Regulators FEATURES s DESCRIPTION The LT®1500 is an adaptive-f...
Datasheet PDF File LT1501 PDF File

LT1501
LT1501

Overview
LT1500/LT1501 Adaptive-Frequency Current Mode Switching Regulators FEATURES s DESCRIPTION The LT®1500 is an adaptive-frequency current mode stepup switching regulator with an internal power switch that is rated up to 700mA.
In contrast to pulse skipping switching regulators, the LT1500 uses a current mode topology that provides lower noise operation and improved efficiency.
Only at very light loads is Burst ModeTM activated to give high efficiency and micropower operation.
High switching frequency (up to 500kHz) allows very small inductors to be used, along with ceramic capacitors if desired.
The LT1500 operates with input voltages from 1.
8V to 15V and has only 200µA operating current dropping to 8µA in shutdown.
A low-battery comparator is included which stays alive in shutdown.
A second output feedback pin with negative polarity allows negative output voltages to be regulated when the switcher is connected up as a Cuk or a flyback converter.
Two package types are available.
The LT1500 comes in a 14-pin SO package, with two options available for fixed output (3.
3V or 5V) or adjustable operation.
A reduced feature part, the LT1501, comes in the smaller 8-pin SO package with internal frequency compensation.
It is also available in adjustable and fixed output voltage versions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
s s s s s s s s s Low Noise Adaptive-Frequency Current Mode Operation Avoids Low Frequency Noise at Most Load Currents Can Be Externally Synchronized (LT1500) Micropower Quiescent Current: 200µA Shutdown Current: 8µA Typ Internal Loop Compensation Low-Battery Comparator Active in Shutdown Minimum Input Voltage: 1.
8V Typ Additional Negative Voltage Feedback Pin (LT1500) Up to 500kHz Switching Frequency Uses Low Profile, Low Cost Surface Mount Inductors U APPLICATIONS s s s s Portable Instrumentation Battery Operated Systems PDA’s Standby Power TYPICAL APPLICA...


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