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LT149AI, LT14P1, LT1500

Table of contents:
Info of LT149AI
Info of LT14P1
Info of LT1500

LT149AI, LT14P1, LT1500 Selling Leads, Datasheet

MFG:LT Package Cooled:SMD D/C:20

LT149AI, LT14P1, LT1500 Datasheet download

Five Points

Part Number: LT149AI

MFG: LT

Package Cooled: SMD

D/C: 20

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LT1500 General Description

The LT^®1500 is an adaptive-frequency current mode step-up 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 im-proved efficiency. Only at very light loads is Burst Mode^TM activated to give high efficiency and micropower opera-tion. 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.

LT1500 Maximum Ratings

Supply Voltage........................................................20V
Switch Voltage (SW)............................................... 30V
Shutdown Voltage (SHDN)......................................20V
I_SENSE Voltage.........................................................20V
FB Voltage.................................................................5V
LBI Voltage................................................................5V
LBO Voltage.............................................................15V
Operating Ambient Temperature Range
   Commercial................................................0 to 70
   Industrial..............................................40 to 85
Operating Junction Temperature Range
   Commercial..............................................0 to 100
   Industrial............................................40 to 100
Storage Temperature Range.................65 to 150
Lead Temperature (Soldering, 10 sec)..................300

LT1500 Features

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

LT1500 Typical Application

Portable Instrumentation
Battery Operated Systems
PDA's
Standby Power

LT1500 Connection Diagram

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