LT1308ACF

Overview

The LT1308ACF is a micropower, fixed-frequency step-up DC/DC converter manufactured by Analog Devices Inc. It operates over an input voltage range of 1V to 10V and delivers up to 2A output current with adjustable output voltage starting from 1.22V. The device utilizes a 600kHz switching frequency and features automatic Burst Mode operation at light loads, consuming only 140µA at no load. Packaged in a 14-TSSOP surface-mount case, it supports output power levels between 2W and 5W with efficiency reaching 90%. The component is designed for high-current applications requiring single-cell or multi-cell battery operation.

Feature Summary

• Micropower design with automatic Burst Mode operation for low quiescent current consumption
• Fixed 600kHz switching frequency enabling compact external component sizing
• Wide 1V to 10V input voltage range suitable for various battery configurations
• High output current capability up to 2A with adjustable output voltage

Applications

• GSM cellular phone power supplies
• Single-cell lithium-ion battery step-up conversion
• Multi-cell alkaline or NiMH battery boost applications
• Portable equipment requiring high current from low voltage sources

Procurement Notes

Verify the specific suffix (e.g., #PBF) indicates lead-free compliance and RoHS status as per Analog Devices documentation. Confirm the package type matches the required 14-TSSOP footprint. Ensure the ordering part number corresponds to the exact electrical specifications needed, particularly regarding the adjustable output voltage range and maximum current ratings defined in the official datasheet.

Selection Notes

Select this component when a wide input voltage range and high output current are required from a micropower converter. The 600kHz frequency allows for smaller inductors and capacitors compared to lower-frequency alternatives. Consider the thermal performance in the 14-TSSOP package if operating near the maximum current limits. Verify that the application requires an adjustable output voltage rather than a fixed internal reference.

Part Context

The LT1308 series includes variants such as LT1308A and LT1308B, which are improved versions offering enhanced performance over earlier models. Analog Devices acquired Linear Technology, the original manufacturer, consolidating these products into its portfolio. The AC designation typically refers to the commercial temperature grade operating range of 0°C to 70°C.

Replacement Considerations

LT1308AIS8 is a documented variant within the same family offering similar functionality with specific packaging differences.