LM36922HYFFR LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM36922HYFFR is an active LED driver IC manufactured by Texas Instruments, designed for backlight applications requiring dual-output DC-DC boost regulation with I2C and PWM dimming control. This part operates from a 2.5V to 5.5V supply and delivers up to 25mA per channel at 38V output. The device is currently in active production status with 1215 units in stock.

Substitute parts are identified when design requirements necessitate alternative packaging, higher current capacity, extended temperature ranges, or different dimming control architectures while maintaining functional equivalence in boost topology and dual-output configuration.

Substiute Parts

LM36922HYFFR

Texas InstrumentsIn Stock: 1242LM36922HYFFR Datasheet

Current PartRFQ

A8518KLPTR-T

Allegro MicroSystemsIn Stock: 18832A8518KLPTR-T Datasheet

MFR RecommendedRFQ

ADP1660ACBZ-R7

Analog Devices Inc.In Stock: 16339ADP1660ACBZ-R7 Datasheet

MFR RecommendedRFQ

ISL97682IRTZ-T

Renesas Electronics CorporationIn Stock: 1145ISL97682IRTZ-T Datasheet

MFR RecommendedRFQ

LT3466EDD#TRPBF

Analog Devices Inc.In Stock: 2084LT3466EDD#TRPBF Datasheet

MFR RecommendedRFQ

LT3466EFE#PBF

Analog Devices Inc.In Stock: 1385LT3466EFE#PBF Datasheet

MFR RecommendedRFQ

LT3497EDDB#TRMPBF

Analog Devices Inc.In Stock: 8086LT3497EDDB#TRMPBF Datasheet

MFR RecommendedRFQ

LT3909EMSE#PBF

Analog Devices Inc.In Stock: 1020LT3909EMSE#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

• Topology: All substitutes must employ Step-Up (Boost) topology with internal switching capability
• Output Configuration: Dual-output (2 outputs) requirement maintained across all alternatives
• Dimming Control: I2C or PWM dimming capability required; parts with both control methods are preferred for maximum compatibility
• Supply Voltage Overlap: Minimum supply voltage must not exceed 5.5V; maximum supply voltage must be at least 2.5V to ensure operational overlap with the main part
• Output Voltage Range: Output voltage must support 38V operation or higher
• Current Capacity: Current per channel must meet or exceed 25mA minimum requirement
• Package Type: Surface mount packages acceptable; BGA, TQFN, TSSOP, DFN, and WLCSP packages all qualify
• Product Status: Active production status required
• Compliance: ROHS3 compliance and EAR99 classification maintained

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (I2C Dimming Control)

ADP1660ACBZ-R7 provides I2C dimming control matching the LM36922HYFFR architecture. This part operates within a 2.7V to 5V supply range, overlapping the main part's 2.5V to 5.5V specification. Output voltage range of 4.575V to 5.425V differs significantly from the 38V output of the main part, limiting this substitute to applications requiring lower output voltages. MSL rating of 1 (Unlimited) matches the main part. This substitute is suitable only when output voltage requirements are substantially lower than 38V.

PWM-Only Substitutes (Higher Current Capacity)

ISL97682IRTZ-T, LT3466EDD#TRPBF, LT3466EFE#PBF, and LT3497EDDB#TRMPBF all provide PWM dimming control with current capacities ranging from 100mA to 400mA, exceeding the main part's 25mA per channel. These parts support output voltages of 35V to 45V, compatible with the 38V requirement. Supply voltage ranges vary: ISL97682IRTZ-T operates from 4V to 26.5V (upper range exceeds main part); LT3466 variants operate from 2.7V to 24V; LT3497EDDB#TRMPBF operates from 2.5V to 10V (closest match to main part range). All maintain ROHS3 compliance and active production status.

Analog/PWM Hybrid Substitutes (Extended Temperature)

LT3909EMSE#PBF and A8518KLPTR-T both support Analog and PWM dimming control. LT3909EMSE#PBF operates from 2.9V to 40V with 50mA per channel and extended operating temperature to 125°C (TJ), with automotive grade qualification. A8518KLPTR-T operates from 4.5V to 40V with 200mA per channel and extended operating temperature to 125°C (TA), also with AEC-Q100 automotive qualification. Both exceed the main part's current capacity and output voltage requirements. A8518KLPTR-T supply voltage minimum of 4.5V exceeds the main part's 2.5V minimum, potentially limiting compatibility in low-voltage applications.

Selection Criteria Summary

• For I2C control preservation: ADP1660ACBZ-R7 (output voltage dependent)
• For higher current with PWM control: LT3466 series or ISL97682IRTZ-T
• For automotive-grade extended temperature: LT3909EMSE#PBF or A8518KLPTR-T
• For supply voltage range closest to main part: LT3497EDDB#TRMPBF or LT3466 variants

Frequently Asked Questions (FAQ)

Q: Can I substitute the LM36922HYFFR with ADP1660ACBZ-R7 in my application?

A: ADP1660ACBZ-R7 shares I2C dimming control and dual-output boost topology. However, its output voltage range of 4.575V to 5.425V is incompatible with applications requiring 38V output. Substitution is only valid if your design operates at significantly lower output voltages.

Q: What is the key difference between PWM-only substitutes and the main part?

A: The LM36922HYFFR supports both I2C and PWM dimming control. PWM-only substitutes (ISL97682IRTZ-T, LT3466 series, LT3497EDDB#TRMPBF) eliminate I2C control capability. If your application requires I2C-based dimming, these parts are not compatible without redesigning the control interface.

Q: Why do some substitutes have higher supply voltage maximums than the main part?

A: Substitutes like LT3909EMSE#PBF (40V max) and A8518KLPTR-T (40V max) are designed for broader application ranges. The higher maximum supply voltage does not affect compatibility with the LM36922HYFFR's 2.5V to 5.5V operating range, as long as your circuit operates within that range.

Q: Is MSL rating important for my substitution decision?

A: MSL (Moisture Sensitivity Level) rating affects storage and handling requirements. The main part and most substitutes carry MSL 1 (Unlimited), requiring no special moisture control. ISL97682IRTZ-T carries MSL 3 (168 Hours), requiring moisture-controlled storage and baking before reflow. A8518KLPTR-T carries MSL 2 (1 Year). If your supply chain lacks moisture control infrastructure, prioritize MSL 1 parts.

Q: Can I use LT3497EDDB#TRMPBF as a drop-in replacement?

A: LT3497EDDB#TRMPBF is not a drop-in replacement due to package differences (10-DFN vs. 12-DSBGA) and PWM-only dimming control. However, it provides the closest supply voltage range match (2.5V to 10V) and maintains 38V+ output capability. PCB redesign is required for package accommodation.

Q: Which substitute offers the best current capacity for high-brightness applications?

A: ADP1660ACBZ-R7 provides the highest current capacity at 750mA (Flash mode) per channel. However, its output voltage limitation (4.575V to 5.425V) restricts use to low-voltage LED applications. For 38V+ output requirements, LT3466 series and LT3497EDDB#TRMPBF offer 400mA per channel, the highest available at this voltage level.

Q: Are all substitutes automotive-qualified?

A: Only LT3909EMSE#PBF (Automotive Grade, -40°C to 125°C TJ) and A8518KLPTR-T (AEC-Q100 qualified, -40°C to 125°C TA) carry automotive qualifications. Other substitutes are industrial-grade with -40°C to 85°C operating ranges. Automotive applications require these specifically qualified parts.

Q: What package considerations should I evaluate?

A: The main part uses 12-DSBGA (Ball Grid Array). Substitutes employ MSOP, TQFN, DFN, TSSOP, and WLCSP packages. Each requires different PCB layout and assembly processes. TSSOP and DFN packages are most common in manufacturing; BGA and WLCSP packages require specialized assembly equipment. Verify your manufacturing capability before selecting a substitute.