ISL97801ARZ LED Driver IC Equivalent & Substitute Parts

Part Overview

The ISL97801ARZ is a LED Driver IC manufactured by Renesas Electronics Corporation, designed for backlight applications. It functions as a 1-output DC-DC regulator with step-down (buck) and step-up (boost) topology, delivering 1A output current with analog and PWM dimming capabilities. The device operates across a 2.7V to 16V supply range and supports 32V output voltage.

The ISL97801ARZ is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	ISL97801ARZ
Manufacturer	Renesas Electronics Corporation
Product Status	Obsolete
Type	DC DC Regulator
Topology	Step-Down (Buck), Step-Up (Boost)
Number of Outputs	1
Voltage - Supply (Min)	2.7V
Voltage - Supply (Max)	16V
Voltage - Output	32V
Current - Output / Channel	1A
Frequency	1MHz
Dimming	Analog, PWM
Applications	Backlight
Operating Temperature	-40°C ~ 105°C (TA)
Grade	Automotive
Package / Case	20-VFQFN Exposed Pad
RoHS Status	ROHS3 Compliant
MSL	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the ISL97801ARZ are categorized based on alignment with critical electrical and mechanical parameters that determine functional compatibility:

Primary Substitution Criteria:

Topology: Step-Down (Buck), Step-Up (Boost) configuration
Output current capability: 1A or greater
Supply voltage range: Minimum 2.7V, maximum 16V or higher
Dimming capability: Analog and/or PWM support
Package compatibility: Surface mount with similar form factor
Operating temperature range: -40°C minimum, 105°C or higher maximum
Compliance: ROHS3 compliant

Grouping Logic:

Group 1 - Direct Parametric Equivalent (Identical Topology & Performance): ISL78100ARZ represents a parametric equivalent with identical electrical specifications, topology, and package format. This part maintains automotive-grade qualification and identical operating temperature range.

Group 2 - Functional Equivalents (Buck-Boost Topology, Higher Current Capability): LT3517IFE#TRPBF and LT3518EFE#PBF / LT3518HFE#PBF provide buck-boost topology with higher switch current ratings (1.5A and 2.3A respectively), wider supply voltage range (3V-30V), and extended frequency tuning capability. These support both analog and PWM dimming.

Group 3 - Multi-Topology Alternatives (Extended Topology Support): LT3519IMS-1#TRPBF and LT3956EUHE#TRPBF offer SEPIC, buck, and boost topologies with flexible dimming options. LT3519IMS-1#TRPBF maintains 750mA switch current and 1MHz frequency. LT3956EUHE#TRPBF provides higher current capability (3.3A) and extended voltage range (4.5V-80V).

Group 4 - Boost-Only Topology (Limited Substitution): MAX8607ETD+T, MIC2873YCS-TR, and ISL97634IRT18Z-TK are boost-only regulators. These are suitable only for applications requiring step-up conversion exclusively and do not support buck topology.

Parameter Comparison

Part Number	Manufacturer	Product Status	Topology	Supply Min (V)	Supply Max (V)	Output Voltage (V)	Current (A)	Frequency (MHz)	Dimming	Package	Temp Range (°C)	RoHS
ISL97801ARZ	Renesas	Obsolete	Buck, Boost	2.7	16	32	1	1	Analog, PWM	20-VFQFN	-40 to 105	ROHS3
ISL78100ARZ	Renesas	Active	Buck, Boost	2.7	16	32	1	1	Analog, PWM	20-VFQFN	-40 to 105	ROHS3
LT3517IFE#TRPBF	Analog Devices	Active	Buck, Boost	3	30	—	1.5 (Switch)	0.25–2.5	Analog, PWM	16-TSSOP-EP	-40 to 125	ROHS3
LT3518EFE#PBF	Analog Devices	Active	Buck, Boost	3	30	—	2.3 (Switch)	0.25–2.5	Analog, PWM	16-TSSOP-EP	-40 to 125	ROHS3
LT3518HFE#PBF	Analog Devices	Active	Buck, Boost	3	30	—	2.3 (Switch)	0.25–2.5	Analog, PWM	16-TSSOP-EP	-40 to 150	ROHS3
LT3519IMS-1#TRPBF	Analog Devices	Active	SEPIC, Buck, Boost	3	30	—	0.75 (Switch)	1	Analog, PWM	16-MSOP	-40 to 125	ROHS3
LT3956EUHE#TRPBF	Analog Devices	Active	Flyback, SEPIC, Buck, Boost	4.5	80	80	3.3 (Switch)	0.1–1	Analog, PWM	36-QFN (5x6)	-40 to 125	ROHS3
LM3410YMF/NOPB	Texas Instruments	Active	SEPIC, Boost	2.7	5.5	3–24	2.8 (Switch)	0.525	PWM	SOT-23-5	-40 to 125	ROHS3
ISL97634IRT18Z-TK	Renesas	Active	SEPIC, Boost	2.4	5.5	—	0.05	1.45	PWM	8-TDFN (2x3)	-40 to 85	ROHS3
MAX8607ETD+T	Analog Devices/Maxim	Active	Boost	2.7	5.5	—	1.5 (Flash)	1	—	14-TDFN (3x3)	-40 to 85	ROHS3
MIC2873YCS-TR	Microchip	Active	Boost	2.7	5.5	—	1.2 (Flash)	2	Single-Wire	9-WLCSP (1.3x1.3)	-40 to 85	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): ISL78100ARZ is the primary recommendation. It maintains identical electrical specifications, topology, package format, and operating temperature range as the ISL97801ARZ. The part is active and automotive-qualified (AEC-Q100), ensuring supply chain continuity and design compatibility without circuit modification.

For Buck-Boost Applications with Extended Voltage Range: LT3517IFE#TRPBF and LT3518EFE#PBF / LT3518HFE#PBF are suitable when supply voltage may exceed 16V or when higher switch current capability is required. Both support analog and PWM dimming. LT3518HFE#PBF extends operating temperature to 150°C (TJ), beneficial for high-temperature environments. These parts require package footprint redesign (16-TSSOP-EP vs. 20-VFQFN).

For Multi-Topology Flexibility: LT3519IMS-1#TRPBF provides SEPIC, buck, and boost topologies in a compact 16-MSOP package. Suitable when circuit topology optimization is required. Switch current is limited to 750mA, appropriate for lower-power backlight applications.

LT3956EUHE#TRPBF offers the broadest topology support (Flyback, SEPIC, Buck, Boost) with 3.3A switch current and extended voltage range (4.5V-80V). Recommended for high-power or multi-topology design requirements. Requires 36-QFN package accommodation.

For Boost-Only Applications: If the application requires step-up conversion exclusively, MAX8607ETD+T, MIC2873YCS-TR, or ISL97634IRT18Z-TK are viable. These are not suitable for buck topology requirements. MAX8607ETD+T and MIC2873YCS-TR target camera flash applications with 1.5A and 1.2A flash current respectively. ISL97634IRT18Z-TK is a low-current option (50mA) for minimal power backlight applications.

Compliance Considerations: All recommended substitutes are ROHS3 compliant. ISL78100ARZ carries automotive-grade qualification (AEC-Q100), matching the original part's automotive designation. Analog Devices parts (LT series) are industrial-grade with extended temperature ranges suitable for automotive environments but without explicit AEC-Q100 marking.

Frequently Asked Questions (FAQ)

Q: Can ISL78100ARZ be used as a direct drop-in replacement for ISL97801ARZ?

A: Yes. ISL78100ARZ is a parametric equivalent with identical electrical specifications, topology (buck-boost), output current (1A), supply voltage range (2.7V-16V), dimming capability (analog and PWM), operating temperature range (-40°C to 105°C), and package format (20-VFQFN). The primary difference is product status: ISL78100ARZ is active while ISL97801ARZ is obsolete. No circuit modification is required.

Q: What is the key difference between LT3517IFE#TRPBF and LT3518EFE#PBF?

A: Both parts support identical buck-boost topology and dimming (analog and PWM). The primary difference is switch current capability: LT3517IFE#TRPBF provides 1.5A while LT3518EFE#PBF provides 2.3A. LT3518HFE#PBF is a variant of LT3518EFE#PBF with extended operating temperature to 150°C (TJ). Select based on required output current and thermal environment.

Q: Why are boost-only parts (MAX8607ETD+T, MIC2873YCS-TR) listed as substitutes if they don't support buck topology?

A: These parts are listed because they were identified in the original substitute list provided. However, they are suitable only for applications requiring step-up (boost) conversion exclusively. If the application requires both buck and boost capability, these parts are not compatible. Verify application topology requirements before selection.

Q: What package considerations apply when switching from ISL97801ARZ to LT3517IFE#TRPBF?

A: ISL97801ARZ uses 20-VFQFN (4x4mm) package while LT3517IFE#TRPBF uses 16-TSSOP-EP (0.173" width, 4.40mm). The TSSOP package has different pin pitch and footprint. PCB layout redesign is required. Verify thermal management requirements, as TSSOP-EP may have different thermal performance characteristics than VFQFN.

Q: Is LT3956EUHE#TRPBF suitable for backlight applications?

A: LT3956EUHE#TRPBF supports buck, boost, SEPIC, and flyback topologies with 3.3A switch current and extended voltage range (4.5V-80V). While it provides broader topology flexibility than ISL97801ARZ, it is not specifically designated for backlight applications in the provided data. Verify application requirements and thermal design before selection.

Q: What is the significance of MSL (Moisture Sensitivity Level) in part selection?

A: ISL97801ARZ and ISL78100ARZ have MSL 3 (168 hours), requiring controlled storage and handling. Analog Devices and Microchip parts have MSL 1 (unlimited), allowing standard storage conditions. For high-volume production or extended storage, MSL 1 parts reduce moisture-related defect risk.

Q: Can LT3519IMS-1#TRPBF replace ISL97801ARZ in a backlight application?

A: LT3519IMS-1#TRPBF supports buck, boost, and SEPIC topologies with analog and PWM dimming, making it functionally compatible. However, switch current is limited to 750mA compared to ISL97801ARZ's 1A. This part is suitable only for backlight applications with output current requirements ≤750mA. Verify load current before selection.

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