IC manufacturers ISSI
IC manufacturers (103)
- All manufacturers
Analog Devices
Infineon Technologies
Microchip
Onsemi
Renesas
ROHM
STMicroelectronics
Texas Instruments
- 3peak incorporated (28)
- Ablic (23)
- Acco Semiconductor (1)
- Advanced Power (4)
- Allegro Microsystems (100)
- Alpha & Omega Semiconductor (37)
- AnalogySemi (3)
- AnDAPT Inc (204)
- Anpec (13)
- AXElite (2)
- Backward (6)
- Bright Power Semiconductor (1)
- Broadcom (46)
- Cambridge GaN Devices (18)
- Chipanalog Micro (10)
- Cologne Chips (1)
- Convenient Power (1)
- Dialog Semiconductor (12)
- Diodes Incorporated (259)
- Divimath (8)
- Elmos AG (1)
- EPC (136)
- e-Peas Semiconductors (1)
- Eta Solutions Co. Ltd. (9)
- GaN Systems (8)
- GaNPower (3)
- Giantec (1)
- Gstek Wuxi (1)
- Helix Semiconductor (7)
- IKON (1)
- Indie Semiconductor (8)
- Innovision Semiconductor Inc (2)
- Intel (68)
- Inventchip Technology (3)
- ISSI (51)
- JoulWatt (20)
- KDPOF (3)
- Kinetic Technology (8)
- Lattice semiconductor Corporation (38)
- Littelfuse (1)
- Lumissil Microsystems (8)
- M3 Technology (M3Tek) (7)
- Macnica (22)
- Marvell Semiconductor (1)
- MaxLinear (181)
- Menlo Micro (1)
- MikroE (25)
- MindCet (2)
- Monolithic Power Systems (980)
- Navitas Semiconductor Inc (6)
- NewEdge Technologies, Inc. (1)
- Nexperia (266)
- Nisshinbo Micro Device Inc. (10)
- Novosense Micro (1)
- NXP (333)
- O2 Micro International Ltd (10)
- On Bright (7)
- Panasonic (2)
- PN Junction Semiconductor (2)
- Power Integrations (117)
- Powermat (1)
- Pulsiv (19)
- Qorvo (96)
- Realsil SuRealsil(tek) Microelectronics (1)
- Richtek (297)
- Sanken Electric Co., Ltd. (16)
- Sckipio (6)
- Semtech (86)
- SG-Micro (54)
- SiFive (2)
- Silanna Semiconductor (9)
- Silergy Corporation (33)
- Silicon Laboratory Inc. (108)
- Silicontent Technology (59)
- Silvertel (59)
- Skycore Semiconductors (1)
- Skyworks (33)
- Southchip (14)
- Summit Wireless (1)
- Tagore Tech (7)
- Taiwan Semiconductor (1)
- TDK Corporation (1)
- Tempo Semiconductor (1)
- Torex (37)
- Toshiba (25)
- Transphorm (21)
- TransSIP (2)
- Union (21)
- uPI Semiconductor (2)
- Valens Semiconductor (31)
- Wise Integration (3)
- Wolfspeed (23)
- Xilinx (22)
- XL Semiconductor (3)
- XYSemi (62)
ISSI IS32LT3952-GRLA3-EB | Demoboard IS31LT3952_IS32LT3952 DEMO BOARD
CONSTANT-CURRENT 1.5-AMPERE PWM DIMMABLE BUCK REGULATOR LED DRIVER WITH FAULT PROTECTION
Overview
| Topology | Buck Converter |
| Input voltage | 4.5-38 V |
| Switching frequency | 1-2000 kHz |
| Output 1 | 1.5 A |
| IC revision | A |
Description
The IS31LT3952_IS32LT3952 is a DC-to-DC switchingconverter, which integrate an N-channel MOSFET tooperate in a buck configuration. The device supply awide input voltage between 4.5V and 38V andprovides a constant current of up to 1.5A for driving asingle LED or multiple series connected LEDs.The external resistor, RSET, is used to adjust LEDoutput current, which allowing the output voltage to beautomatically adjusted for a variety of LEDconfigurations.The IS31LT3952_IS32LT3952 operates in a fixedfrequency mode during switching. There is an externalresistor connected between the VCC and TON pinsused to configure the on-time (switching frequency).The switching frequency is dithered for spreadspectrum feature to spread the electromagneticemitting energy into a wider frequency band. It ishelpful to optimize the EMI performance.A logic input PWM signal to the enable (EN) pin isapplied to adjust the LED current. The brightness ofLED is proportional to the duty cycle of the PWMsignal.True average output current operation is achieved withfast transient response by using cycle-by-cycle,controlled on-time method.IS31LT3952_IS32LT3952 is available in an SOP-8-EPpackage with an exposed pad for enhanced thermaldissipation. It operates from 4.5V to 38V over thetemperature 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
- 1.5A 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:
- Pin-to-GND short
- Component open/short faults
- Adjacent pin-to-pin short
- LED open/short
- AEC-Q100 qualification IS32LT3952 only
Typical applications
- Automotive and avionic lighting / Daytime running lights / Turn/stop lights / Front and rear fog lights / Map light
- Dimmable interior lights
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 |