LT3922: 36V, 2A Synchronous Step-Up LED Driver Data Sheet (Rev. B)2/8/20213 M
Features and Benefits
- ±2.5% LED Current Regulation
- ±2% Output Voltage Regulation
- 5000:1 PWM Dimming at 100Hz
- 128:1 Internal PWM Dimming
- Spread-Spectrum Frequency Modulation
- Silent Switcher® Architecture for Low EMI
- Operates in Boost, Buck Mode and Buck-Boost Mode
- 2.8V to 36V Input Voltage Range
- Up to 34V LED String Voltage
- 2A, 40V Internal Switches
- 200kHz to 2MHz with SYNC Function
- Analog or Duty Cycle LED Current Control
- Open/Short LED Protection and Fault Indication
- Thermally Enhanced 28-Pin (4mm × 5mm) QFN
The LT3922 is a monolithic, synchronous, step-up DC/DC converter that utilizes fixed-frequency, peak current control and provides PWM dimming for a string of LEDs. The LED current is programmed by an analog voltage or the duty cycle of pulses at the CTRL pin. The LT3922 will maintain ±2.5% current regulation through an external sense resistor over a wide range of output voltages.
The switching frequency is programmable from 200kHz to 2MHz by an external resistor at the RT pin or by an external clock applied at the SYNC/SPRD pin. With the optional spread spectrum frequency modulation enabled, the frequency varies from 100% to 125% to reduce EMI. The LT3922 also includes a driver for an external high side PMOS for PWM dimming and an internal PWM signal generator for analog control of PWM dimming when an external signal is not available.
Additional features include an accurate external reference voltage for use with the CTRL and PWM pins, an LED current monitor, an accurate EN/UVLO pin threshold, open-drain fault reporting for open-circuit and short-circuit load conditions, and thermal shutdown.
- Automotive and Industrial Lighting
- Machine Vision
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Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit DC2247A is a synchronous 2MHz boost LED driver featuring the LT®3922. The LT3922 features a low EMI Silent Switcher architecture and an optional spread spectrum frequency modulation (SSFM) that further reduces EMI. It has a 2A/36V internal power switch, but the demo board has been configured to use a 4V to 28V input and thus has input overvoltage lockout set at 28V. It drives a single string of LEDs at 330mA up to 34V when the input voltage is between 7V and 28V.
DC2247A comes with low EMI features including optimized layout, SSFM, and input and output filters. It passes CISPR 25 class 5 conducted and radiated EMI. The LT3922 is protected against both open and short LED conditions and reports these faults. It also includes thermal shutdown.
Documentation & Resources
R580 Reliability Data4/17/2019151 K
DC2247A - Demo Manual8/25/2016889K
Does the Assembly Orientation of an SMPS Inductor Affect Emissions?6/4/2021 Analog Dialogue
Synchronous, Low EMI LED Driver Features Integrated Switches and Internal PWM Dimming8/1/2018 LT Journal
Synchronous, Low EMI LED Driver Features Integrated Switches and Internal PWM8/18/20164M
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|LT3922EUFD#PBF||Material Declaration||Reliability Data||28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)|
|LT3922EUFD#TRPBF||Material Declaration||Reliability Data||28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)|
|LT3922HUFD#PBF||Material Declaration||Reliability Data||28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)|
|LT3922HUFD#TRPBF||Material Declaration||Reliability Data||28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)|
|LT3922IUFD#PBF||Material Declaration||Reliability Data||28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)|
|LT3922IUFD#TRPBF||Material Declaration||Reliability Data||28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)|
|Wafer Fabrication Data||R580 Reliability Data|
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