LP8545SQE/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LP8545SQE/NOPB is an active LED Driver IC manufactured by Texas Instruments, designed for backlight applications requiring a 6-output DC-DC regulator with step-up (boost) topology and PWM dimming capability. This part operates from a 2.7V to 22V supply and delivers 50mA per channel at up to 40V output, housed in a 24-WQFN (4x4) surface mount package.

Equivalent and substitute parts are identified when inventory constraints, lead time requirements, or design flexibility necessitate alternative component selection while maintaining functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	LP8545SQE/NOPB
Manufacturer	Texas Instruments
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	6
Voltage - Supply (Min)	2.7V
Voltage - Supply (Max)	22V
Voltage - Output	40V
Current - Output / Channel	50mA
Frequency	156kHz, 312kHz, 625kHz, 1250kHz
Dimming	PWM
Operating Temperature	-30°C ~ 85°C (TA)
Package / Case	24-WFQFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts are classified based on alignment with the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

DC-DC Regulator topology (Step-Up/Boost)
Number of outputs (6 outputs)
Supply voltage range compatibility (minimum 2.7V input capability)
Output voltage capability (40V or higher)
Current per channel (50mA or higher)
PWM dimming support
Surface mount package with exposed pad
Active product status
ROHS3 compliance

Parametric Equivalent: LP8545SQ/NOPB differs only in packaging designation (same electrical specifications, same 24-WQFN footprint).

Manufacturer Recommended Substitutes: Parts listed below meet the core functional requirements but may vary in package type, frequency range, supply voltage limits, or current rating. Selection depends on specific application constraints.

Parameter Comparison

Parameter	LP8545SQE/NOPB	LP8545SQ/NOPB	BD9470AEFV-E2	FAN5702UC15X	ISL97671AIRZ-TK	ISL97672BIRZ	LT3598EFE#TRPBF	MIC3263YML-TR
Manufacturer	Texas Instruments	Texas Instruments	Rohm Semiconductor	Fairchild Semiconductor	Renesas Electronics	Renesas Electronics	Analog Devices Inc.	Microchip Technology
Type	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator	DC DC Regulator
Topology	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Switched Capacitor (Charge Pump)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Number of Outputs	6	6	6	6	6	6	6	6
Voltage - Supply (Min)	2.7V	2.7V	9V	2.7V	4.5V	4.5V	3V	6V
Voltage - Supply (Max)	22V	22V	35V	5.5V	26.5V	26.5V	30V	40V
Voltage - Output	40V	40V	-	-	45V	45V	44V	-
Current - Output / Channel	50mA	50mA	250mA	30mA	50mA	50mA	30mA	30mA
Frequency	156kHz, 312kHz, 625kHz, 1250kHz	156kHz, 312kHz, 625kHz, 1250kHz	150kHz	1.2MHz	600kHz, 1.14MHz	200kHz ~ 1.5MHz	200kHz ~ 2.5MHz	1.2MHz
Dimming	PWM	PWM	PWM	I2C, PWM	PWM	PWM	Analog, PWM	PWM
Operating Temperature	-30°C ~ 85°C (TA)	-30°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	24-WFQFN Exposed Pad	24-WFQFN Exposed Pad	28-VSSOP (0.173", 4.40mm Width) Exposed Pad	16-UFBGA, WLCSP	20-VFQFN Exposed Pad	20-VFQFN Exposed Pad	24-TSSOP (0.173", 4.40mm Width) Exposed Pad	24-VFQFN Exposed Pad, 24-MLF®
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	-	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	2 (1 Year)
Product Status	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement): LP8545SQ/NOPB is a direct parametric equivalent with identical electrical specifications and footprint compatibility. This part maintains all functional characteristics of the LP8545SQE/NOPB and requires no design modification.

Manufacturer Recommended Substitutes:

ISL97671AIRZ-TK and ISL97672BIRZ (Renesas Electronics): Both parts maintain step-up boost topology, 6 outputs, 50mA per channel, and PWM dimming. ISL97671AIRZ-TK operates from 4.5V to 26.5V input with 45V output capability. ISL97672BIRZ provides extended frequency range (200kHz to 1.5MHz) and identical electrical performance. Package differs (20-QFN vs. 24-WQFN), requiring PCB layout modification. Both are ROHS3 compliant with MSL-3 rating.

LT3598EFE#TRPBF (Analog Devices Inc.): Supports step-up boost topology with 6 outputs and 30mA per channel. Operates from 3V to 30V input with 44V output capability. Offers extended operating temperature range (-40°C to 125°C junction temperature). Includes both analog and PWM dimming options. 24-TSSOP package requires different PCB footprint. ROHS3 compliant with MSL-1 rating.

BD9470AEFV-E2 (Rohm Semiconductor): Step-up boost topology with 6 outputs and 250mA per channel (higher current capability). Operates from 9V to 35V input. 28-HTSSOP package requires PCB redesign. ROHS3 compliant with MSL-3 rating. Suitable for applications requiring higher output current.

FAN5702UC15X (Fairchild Semiconductor): Switched capacitor (charge pump) topology with 6 outputs and 30mA per channel. Operates from 2.7V to 5.5V input (limited supply range). Supports both I2C and PWM dimming. 16-WLCSP package (1.71x1.71) requires significant PCB layout modification. Suitable only for low-voltage supply applications.

MIC3263YML-TR (Microchip Technology): Step-up boost topology with 6 outputs and 30mA per channel. Operates from 6V to 40V input. 24-MLF package footprint compatible with 24-VFQFN. Extended operating temperature range (-40°C to 125°C junction temperature). ROHS3 compliant with MSL-2 rating.

All substitute parts maintain active product status and ROHS3 compliance. Selection should be based on specific supply voltage requirements, output current demands, package constraints, and thermal operating conditions of the target application.

Frequently Asked Questions (FAQ)

Q: Can LP8545SQ/NOPB be used as a direct replacement for LP8545SQE/NOPB? A: Yes. LP8545SQ/NOPB is a parametric equivalent with identical electrical specifications, supply voltage range (2.7V to 22V), output voltage (40V), current rating (50mA per channel), frequency options, and 24-WQFN package footprint. No design modification is required.

Q: What is the primary difference between the LP8545SQE/NOPB and ISL97671AIRZ-TK? A: Both are step-up boost regulators with 6 outputs and 50mA per channel. The ISL97671AIRZ-TK operates from 4.5V minimum input (versus 2.7V for LP8545SQE/NOPB) and uses a 20-QFN package instead of 24-WQFN, requiring PCB layout changes. The ISL97671AIRZ-TK is suitable for applications with higher minimum supply voltage.

Q: Why does BD9470AEFV-E2 have a higher current rating (250mA) than the LP8545SQE/NOPB (50mA)? A: BD9470AEFV-E2 is designed for higher-power backlight applications. The increased current capability (250mA per channel) allows driving brighter LED arrays. However, it requires a minimum 9V supply input and uses a different package (28-HTSSOP), making it suitable only for applications with higher supply voltage and current requirements.

Q: Can FAN5702UC15X replace LP8545SQE/NOPB in all applications? A: No. FAN5702UC15X uses switched capacitor (charge pump) topology instead of step-up boost and operates only from 2.7V to 5.5V input. It is limited to low-voltage supply applications and cannot support the full 22V maximum input of the LP8545SQE/NOPB. The 16-WLCSP package also requires significant PCB redesign.

Q: What is the impact of package differences when selecting a substitute part? A: Package differences require PCB layout modification, including trace routing, via placement, and thermal management considerations. LP8545SQE/NOPB uses 24-WQFN (4x4). Substitutes use 20-QFN (3x4), 24-TSSOP, 28-HTSSOP, 16-WLCSP, or 24-MLF packages. Verify PCB space availability and thermal requirements before selecting a substitute with a different package.

Q: Are all substitute parts ROHS3 compliant? A: All listed substitute parts are ROHS3 compliant. However, moisture sensitivity levels (MSL) vary. LP8545SQE/NOPB and LT3598EFE#TRPBF have MSL-1 (unlimited shelf life). BD9470AEFV-E2, ISL97671AIRZ-TK, and ISL97672BIRZ have MSL-3 (168 hours). MIC3263YML-TR has MSL-2 (1 year). Storage and handling requirements differ accordingly.

Q: Which substitute part supports the widest operating temperature range? A: LT3598EFE#TRPBF and MIC3263YML-TR both support -40°C to 125°C (junction temperature), compared to LP8545SQE/NOPB at -30°C to 85°C (ambient temperature). These parts are suitable for applications requiring extended temperature operation.

Q: Can ISL97672BIRZ be used instead of ISL97671AIRZ-TK? A: Yes. Both are Renesas Electronics step-up boost regulators with 6 outputs, 50mA per channel, 4.5V to 26.5V input, and 45V output. ISL97672BIRZ offers extended frequency range (200kHz to 1.5MHz) versus ISL97671AIRZ-TK (600kHz, 1.14MHz). Both use identical 20-QFN package. ISL97672BIRZ provides greater frequency flexibility for EMI optimization.

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