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Product Detailed Parameters
- Description：IC LED DRIVER CTRLR PWM 16ETSSOP
- Series：-
- Mfr：Lumissil Microsystems
- Package：Tape & Reel (TR),Cut Tape (CT)
- Type：DC DC Controller
- Topology：SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s)：No
- Number of Outputs：1
- Voltage - Supply (Min)：5V
- Voltage - Supply (Max)：75V
- Voltage - Output：-
- Current - Output / Channel：-
- Frequency：100kHz ~ 1MHz
- Dimming：PWM
- Applications：General Purpose
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Supplier Device Package：16-eTSSOP
- Grade：-
- Qualification：-
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Overview
The IS31LT3957A is a high-efficiency, synchronous step-down DC-DC converter from Lumissil Microsystems. It integrates a 2.5A power switch and operates with an input voltage range of 2.5V to 5.5V. The device delivers a programmable output voltage between 0.6V and 3.3V with ±1.5% accuracy over line and load conditions. Operating at a fixed frequency of 1.5MHz, it supports adjustable switching frequencies from 400kHz to 2.2MHz. Key electrical parameters include a quiescent current of 18µA in standby mode and a shutdown current below 1µA.
Feature Summary
- Integrated synchronous rectification for enhanced efficiency across light and heavy loads
- Fixed 1.5MHz switching frequency with user-adjustable range capability
- Compact solution utilizing small external passive components
- Comprehensive protection mechanisms including over-current, over-temperature, and UVLO
Applications
- Portable consumer electronics such as smartphones and tablets
- Wireless communication modules and base stations
- Industrial control systems requiring stable low-voltage rails
- Medical instrumentation devices
Procurement Notes
Verify the specific suffix ZLS4-TR against the manufacturer's official datasheet to confirm tape-and-reel packaging and temperature grade. Ensure compatibility with your PCB footprint and thermal requirements. Cross-reference pinouts with the latest revision notes to avoid integration errors during procurement.
Selection Notes
Select this component when a compact, high-frequency buck converter is needed for inputs up to 5.5V. It is suitable for applications prioritizing space savings and efficiency over ultra-low quiescent current requirements found in battery-operated devices. Compare against similar models if higher current capacity or different input ranges are required.
Part Context
This part belongs to the IS31LT series of LED drivers and power management ICs by Lumissil Microsystems. While often associated with LED lighting control, this specific model functions as a general-purpose DC-DC converter. It shares design philosophies with other members of the family regarding protection features and package types.
Replacement Considerations
Direct replacements should be sought within the IS31LT series or comparable offerings from manufacturers like TI or MPS. Verify that substitute parts match the 2.5A current rating and 1.5MHz frequency. Check for pin-to-pin compatibility to minimize redesign efforts.
