LT1303IS8#TRPBF

Overview

The LT1303IS8#TRPBF is a micropower high-efficiency step-up DC/DC converter manufactured by Analog Devices Inc. It operates in SOIC-8 surface-mount packages and utilizes Switch Mode operation for efficient voltage conversion. The device accepts an input voltage range of 1.8 V to 6 V, with some specifications noting up to 10 V. It provides an adjustable output voltage capable of reaching up to 25 V, delivering a maximum output current of 700 mA. Key electrical parameters include a quiescent current of 120 µA from the battery, which reduces to 10 µA in shutdown mode. The internal NPN power switch features a low saturation voltage of 170 mV at a switch current of 1 A. The switching frequency is fixed at 155 kHz. The component supports a shutdown function and includes a low-battery detector with an open-collector output. It operates within a temperature range of 0°C to +70°C.

Feature Summary

• Integrates a low-battery detector providing an open-collector output signal when input voltage drops below a preset threshold.
• Features an on-chip NPN power switch with low saturation voltage to maximize efficiency in small, low-voltage battery-operated systems.
• Includes a shutdown pin that significantly reduces quiescent current consumption for extended battery life.
• Utilizes Switch Mode operation to achieve high efficiency in step-up DC/DC conversion applications.

Applications

• Small, low-voltage battery-operated systems
• Micropower step-up DC/DC conversion
• Portable electronic devices requiring high efficiency

Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing. Confirm the manufacturer is Analog Devices Inc. or its predecessor Linear Technology Corporation. Ensure the package type matches the required SOIC-8 footprint for PCB layout compatibility. Check RoHS compliance status if environmental regulations apply to the final assembly. Validate the operating temperature range requirements against the specified 0°C to +70°C limit.

Selection Notes

Select this component for applications requiring a compact boost converter with integrated low-battery monitoring. It is suitable where input voltages are between 1.8 V and 6 V and adjustable outputs up to 25 V are needed. Consider the 120 µA quiescent current for battery-powered designs. If higher output currents are required, evaluate the LT1305 or LT1302 alternatives. Ensure the SOIC-8 package fits the available board space constraints.

Part Context

The LT1303 belongs to the LT1303 series of micropower high-efficiency DC/DC converters. It is designed specifically for small, low-voltage battery-operated systems. The series includes both adjustable versions like the LT1303 and fixed 5V versions like the LT1303-5. These converters are available in 8-lead PDIP or SO packages to ease board space requirements. They utilize Switch Mode operation for optimal performance.

FAQ

What is the function of the low-battery detector?

The low-battery detector provides an open-collector output that goes low when the input voltage drops below a preset level, indicating low battery status.

How does the shutdown feature affect power consumption?

The shutdown pin further reduces the quiescent current from 120 µA to 10 µA, minimizing power drain during inactive periods.

What is the saturation voltage of the internal power switch?

The on-chip NPN power switch has a low saturation voltage of 170 mV at a switch current of 1 A.