LTC1503CS8-1.8#TRPBF

Voltage - Output (Min/Fixed):	1.8V
Base Part Number:	LTC1503
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	600kHz
Current - Output:	100mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	2.4V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Charge Pump
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LTC1503CS8-1.8#TRPBF is an integrated circuit (IC) component designed and manufactured by Linear Technology Corporation. It is a member of the PMIC (Power Management IC) family and specifically falls under the category of voltage regulators, more specifically - DC DC switching regulators. Its source/drain-contact structure is delivered in a fine-pitch package with easy assembly on a PC board. The component has been optimized for use in high frequency, continuous inductor-based applications with hefty load characteristics, hence, making it suitable for buck (step down) switching applications from a broad range of supply voltages. The component also delivers quiescent current consumption of below 0.1 μA and a shutdown current of <1 μA.

Features

Some of the impressive features of the LTC1503CS8-1.8#TRPBF include:

• Switching frequency of up to 500 kHz
• Input supply voltage range of 1.8 V to 6.5 V
• Output voltage range of 0.8 V to 5.5 V
• Integrated FET switch
• Soft-start capability with programmable ramp time
• Anti-ringing protection for capacitive loads
• Current limit protection
• High power density
• Lead-free, RoHS-compliant package
• Space-saving design

Working Principle

The LTC1503CS8-1.8#TRPBF works by providing a regulated output voltage as set by the voltage controlled oscillator (VCO). To do this, it uses two separate power conversion stages. The first stage is a forward converter, designed to quickly charge the output capacitor after a start-up condition. The second stage is a synchronous buck converter that operates from the VCO. It keeps the output voltage constant regardless of changes in input voltage, load current or temperature.The IC\'s built-in oscillator feeds the control logic and drives the high-side and low-side drivers to switch the output voltage at a fast frequency. As a result, the core of the IC is always in one of two states: switched on for charging the output capacitor and switched off for discharging the output capacitor. The on/off switching stimulates a triangular wave with an adjustable frequency, thus controlling the output voltage.

Applications

The LTC1503CS8-1.8#TRPBF is suitable for use in applications such as:

• Cell phones
• Portable media players (MP3 players, etc.)
• Computer motherboards
• GPS receivers
• Digital cameras
• Networking equipment (routers, hubs, etc.)
• Industrial control systems
• Portable medical devices
• Power tools

Conclusion

The LTC1503CS8-1.8#TRPBF is a highly integrated IC designed and manufactured by Linear Technology Corporation. It is a member of the PMIC family, under the category of voltage regulators, more specifically - DC-DC switching regulators. It is suitable for applications where the input voltage range is 1.8 V to 6.5 V and output voltage range is 0.8 V to 5.5 V. The component also has impressive features such as current limit protection, anti-ringing protection, and integrated FET switch. Additionally, its small size and low power consumption makes it ideal for use in handheld applications.

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