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ISSI IS32LT3954 | Demoboard IS31LT3954_IS32LT3954 DEMO BOARD GUIDE
CONSTANT-CURRENT 3-AMPERE PWM DIMMABLE BUCK REGULATOR LED DRIVER WITH OUTPUT FAULT REPORTING
Overview
| Topology | Buck Converter |
| Input voltage | 4.5-38 V |
| Output 1 | 3 A |
| IC revision | B |
Description
The IS31LT3954_IS32LT3954 is a DC-to-DC switching converter, which integrate an N-channel MOSFET to operate in a buck configuration. The device supply a wide input voltage between 4.5V and 38V and provides a constant current of up to 3A for driving a single LED or multiple series connected LEDs.The external resistor, RSET, is used to adjust LED output current, which allowing the output voltage to be automatically adjusted for a variety of LED configurations.The IS31LT3954_IS32LT3954 operates in a fixed frequency mode during switching. There is an external resistor connected between the VCC and TON pins used to configure the on-time (switching frequency). The switching frequency is dithered for spread spectrum feature to spread the electromagnetic emitting energy into a wider frequency band. It is helpful to optimize the EMI performance.A logic input PWM signal to the enable (EN) pin is applied to adjust the LED current. The brightness of LED is proportional to the duty cycle of the PWM signal.True average output current operation is achieved with fast transient response by using cycle-by cycle,controlled on-time method.IS31LT3954_IS32LT3954 is available in an SOP-8-EP package with an exposed pad for enhanced thermal dissipation. It operates from 4.5V to 38V over the temperature range of -40°C to +125°C.
Features
- Wide input voltage supply from 4.5V to 38V
- Withstand 40V load dump
- ±5% true average output current control
- 3A maximum output over operating temperature range
- Cycle-by-cycle current limit
- Integrated high-side MOSFET switch
- Dimming via direct logic input or power supply voltage
- Internal control loop compensation
- Under-voltage lockout (UVLO) and thermal shutdown protection
- 2μA low power shutdown
- Spread spectrum to optimize EMI
- Robust fault protection and reporting function:
- Pin-to-GND short
- Component open/short faults
- Adjacent pin-to-pin short
- LED open/short
- AEC-Q100 qualification
- IS32LT3954 only
Typical applications
- Automotive and avionic lighting, Daytime running lights, Turn/stop lights, Front and rear fog lights, Matrix headlight, Motorcycle headlight
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT(A) | RDC max.(mΩ) | fres(MHz) | Size | Version | ISAT,10%(A) | ISAT,30%(A) | IR,40K(A) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PD SMT Power Inductor, 10 µH, 7.7 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance10 µH | Performance Rated Current7.7 A | Saturation Current5.5 A | DC Resistance24 mΩ | Self Resonant Frequency21.5 MHz | Size1260 | VersionStandard | Saturation Current @ 10%5.5 A | Saturation Current @ 30%7.2 A | Rated Current5 A | ||||
| WE-PD SMT Power Inductor, 10 µH, 9.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance10 µH | Performance Rated Current9.5 A | – | DC Resistance21 mΩ | Self Resonant Frequency21 MHz | Size1210 | VersionStandard | Saturation Current @ 10%10.5 A | Saturation Current @ 30%13 A | Rated Current7.1 A | ||||
| WE-PD SMT Power Inductor, 15 µH, 7 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance15 µH | Performance Rated Current7 A | Saturation Current4.5 A | DC Resistance28 mΩ | Self Resonant Frequency16.6 MHz | Size1260 | VersionStandard | Saturation Current @ 10%4.5 A | Saturation Current @ 30%5.8 A | Rated Current4.2 A | ||||
| WE-PD SMT Power Inductor, 15 µH, 7.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance15 µH | Performance Rated Current7.4 A | – | DC Resistance26 mΩ | Self Resonant Frequency17 MHz | Size1210 | VersionStandard | Saturation Current @ 10%8 A | Saturation Current @ 30%9.8 A | Rated Current6.5 A | ||||
| WE-PD SMT Power Inductor, 22 µH, 6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance22 µH | Performance Rated Current6 A | Saturation Current3.7 A | DC Resistance36 mΩ | Self Resonant Frequency13.5 MHz | Size1260 | VersionStandard | Saturation Current @ 10%3.7 A | Saturation Current @ 30%4.8 A | Rated Current3.5 A | ||||
| WE-PD SMT Power Inductor, 22 µH, 7 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance22 µH | Performance Rated Current7 A | – | DC Resistance28 mΩ | Self Resonant Frequency10 MHz | Size1210 | VersionStandard | Saturation Current @ 10%6.5 A | Saturation Current @ 30%8 A | Rated Current5.3 A | ||||
| WE-PD SMT Power Inductor, 33 µH, 4.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance33 µH | Performance Rated Current4.6 A | Saturation Current3 A | DC Resistance57 mΩ | Self Resonant Frequency11 MHz | Size1260 | VersionStandard | Saturation Current @ 10%3 A | Saturation Current @ 30%3.9 A | Rated Current2.8 A | ||||
| WE-PD SMT Power Inductor, 33 µH, 5.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance33 µH | Performance Rated Current5.5 A | – | DC Resistance45 mΩ | Self Resonant Frequency8.5 MHz | Size1210 | VersionStandard | Saturation Current @ 10%5.5 A | Saturation Current @ 30%6.8 A | Rated Current4.2 A | ||||
| WE-PD SMT Power Inductor, 47 µH, 4.9 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance47 µH | Performance Rated Current4.9 A | – | DC Resistance60 mΩ | Self Resonant Frequency6.5 MHz | Size1210 | VersionStandard | Saturation Current @ 10%4.5 A | Saturation Current @ 30%5.5 A | Rated Current3.8 A | ||||
| WE-PD SMT Power Inductor, 47 µH, 4.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance47 µH | Performance Rated Current4.1 A | Saturation Current2.6 A | DC Resistance77 mΩ | Self Resonant Frequency9.2 MHz | Size1260 | VersionStandard | Saturation Current @ 10%2.6 A | Saturation Current @ 30%3.4 A | Rated Current2.4 A |