SC603IMLTRT LED Driver IC Equivalent & Substitute Parts

Part Overview

The SC603IMLTRT is a LED Driver IC manufactured by Semtech Corporation, designed for single-output DC-DC regulation with switched capacitor (charge pump) topology. This component delivers 200mA output current and operates across a 2.5V to 6.5V supply range, making it suitable for backlight applications. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines that maintain compatibility with the original electrical and mechanical specifications.

Key Parameters

Parameter	SC603IMLTRT
Manufacturer	Semtech Corporation
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Switched Capacitor (Charge Pump)
Number of Outputs	1
Voltage Supply (Min)	2.5V
Voltage Supply (Max)	6.5V
Voltage Output	4.275V ~ 4.725V
Current Output / Channel	200mA
Frequency	625kHz
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	10-VFDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)
Product Status	Obsolete
Applications	Backlight

Substitute Part Grouping Explanation

Substitution of the SC603IMLTRT requires matching the following critical parameters:

Topology Requirement: The original part uses switched capacitor (charge pump) topology. Direct substitutes must employ identical topology to maintain circuit compatibility without redesign.

Output Current Capacity: Minimum 200mA output current is required to support the original application load.

Supply Voltage Range: Input voltage compatibility between 2.5V and 6.5V ensures operation across the intended power distribution network.

Output Voltage: The regulated output of 4.275V to 4.725V defines the LED string voltage requirement.

Package Compatibility: 10-pin surface mount packages with exposed pad design ensure PCB layout compatibility.

Operating Temperature Range: -40°C to 85°C ambient temperature rating maintains thermal performance specifications.

Compliance & Availability: Active product status with current manufacturing ensures long-term supply chain reliability and technical support.

Based on these criteria, the substitute parts are grouped as follows:

Group 1 - Switched Capacitor (Charge Pump) Topology (Direct Topology Match):

LTC3214EDD#PBF (Analog Devices Inc.) — Active status, 500mA output, 10-DFN package

Group 2 - Step-Up (Boost) Topology (Higher Current Capability, Different Topology):

IS31BL3508B-STLS2-TR (Lumissil Microsystems) — Active status, 1.2A switch current, SOT-23-6 package
LT3465ES6#TRPBF (Analog Devices Inc.) — Active status, 225mA switch current, TSOT-23-6 package
MP1528DK-LF-P (Monolithic Power Systems Inc.) — Active status, 950mA switch current, 8-MSOP package

Group 3 - Step-Down (Buck) Topology (Different Topology, Higher Supply Voltage Range):

LM3404HVMRX/NOPB (Texas Instruments) — Active status, 1A output, 8-SO PowerPad package
LM3414HVSDX/NOPB (Texas Instruments) — Active status, 1A output, 8-WSON package

Group 4 - Multi-Topology (Buck-Boost) Capability:

LT3517HFE#PBF (Linear Technology) — Obsolete status, 1.5A switch current, 16-TSSOP-EP package
LT3518IUF#PBF (Analog Devices Inc.) — Active status, 2.3A switch current, 16-QFN package

Group 5 - SEPIC/Boost Hybrid Topology:

ISL97634IRT14Z-TK (Renesas Electronics Corporation) — Active status, 70mA output, 8-TDFN package

Parameter Comparison

Parameter	SC603IMLTRT	LTC3214EDD#PBF	IS31BL3508B-STLS2-TR	LT3465ES6#TRPBF	LM3404HVMRX/NOPB	LM3414HVSDX/NOPB	LT3518IUF#PBF	MP1528DK-LF-P
Manufacturer	Semtech	Analog Devices	Lumissil	Analog Devices	Texas Instruments	Texas Instruments	Analog Devices	Monolithic Power
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Topology	Switched Capacitor	Switched Capacitor	Step-Up (Boost)	Step-Up (Boost)	Step-Down (Buck)	Step-Down (Buck)	Buck-Boost	Step-Up (Boost)
Number of Outputs	1	1	1	1	1	1	1	1
Voltage Supply (Min)	2.5V	2.9V	2.7V	2.7V	6V	4.5V	3V	2.7V
Voltage Supply (Max)	6.5V	4.5V	5.5V	16V	75V	65V	30V	36V
Current Output / Channel	200mA	500mA	1.2A (Switch)	225mA (Switch)	1A	1A	2.3A (Switch)	950mA (Switch)
Frequency	625kHz	900kHz	1MHz	1.2MHz	1MHz	500kHz	250kHz ~ 2.5MHz	—
Operating Temperature	-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)	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Package / Case	10-VFDFN Exposed Pad	10-WFDFN Exposed Pad	SOT-23-6	SOT-23-6 Thin	8-PowerSOIC	8-WFDFN Exposed Pad	16-WQFN Exposed Pad	8-TSSOP / 8-MSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Applications	Backlight	Backlight, Lighting	Backlight	Backlight	Lighting	Lighting	Backlight	Backlight

Engineering Selection Recommendations

Primary Recommendation: LTC3214EDD#PBF

The LTC3214EDD#PBF from Analog Devices Inc. is the optimal substitute for the SC603IMLTRT. This part maintains identical switched capacitor (charge pump) topology, eliminating circuit redesign requirements. The 500mA output current exceeds the original 200mA specification, providing design margin. Supply voltage range (2.9V to 4.5V) overlaps the critical lower operating window of the original part. Active product status ensures ongoing availability and technical support. ROHS3 compliance and MSL-1 rating match the original specifications. The 10-DFN package provides equivalent PCB footprint compatibility with the original 10-VFDFN design.

Secondary Recommendations by Application Context:

For applications requiring higher output current capacity with boost topology, the IS31BL3508B-STLS2-TR (1.2A switch current) or MP1528DK-LF-P (950mA switch current) provide active alternatives. These require circuit topology redesign but offer superior current handling.

For applications operating at higher supply voltages (above 6.5V), the LM3414HVSDX/NOPB (4.5V to 65V range) or LT3518IUF#PBF (3V to 30V range) provide buck or buck-boost regulation. These topologies require different external component configurations.

The LT3517HFE#PBF, while listed as an original substitute, carries obsolete status and should not be selected for new designs despite its buck-boost capability.

Compliance Considerations:

All recommended active substitutes maintain ROHS3 compliance and EAR99 export classification. MSL-1 rated parts (LTC3214EDD#PBF, LT3465ES6#TRPBF, LT3518IUF#PBF, MP1528DK-LF-P) require no special moisture handling beyond standard SMT processes. MSL-3 rated parts (IS31BL3508B-STLS2-TR, LM3404HVMRX/NOPB) require 168-hour dry storage compliance.

Frequently Asked Questions (FAQ)

Q: Can the LTC3214EDD#PBF be used as a direct drop-in replacement for the SC603IMLTRT?

A: The LTC3214EDD#PBF maintains identical switched capacitor topology and operates within compatible voltage ranges. However, the package footprint differs (10-DFN versus 10-VFDFN). PCB layout modification is required, though the pin count and functional pinout are equivalent. No circuit redesign is necessary.

Q: Why are boost topology parts listed as substitutes if the original uses charge pump topology?

A: Boost topology parts (IS31BL3508B-STLS2-TR, LT3465ES6#TRPBF, MP1528DK-LF-P) are functionally equivalent for backlight LED driver applications despite different internal topologies. Both charge pump and boost topologies regulate voltage upward from a lower supply. Substitution requires circuit redesign and external component reconfiguration but maintains application compatibility.

Q: What is the significance of the MSL rating difference between parts?

A: MSL-1 rated parts (unlimited moisture sensitivity level) require standard SMT handling. MSL-3 rated parts require dry storage for 168 hours before reflow soldering. For high-volume production, MSL-1 parts reduce manufacturing constraints. MSL-3 parts require bake-out procedures if storage exceeds 168 hours.

Q: Does the higher current output of LTC3214EDD#PBF (500mA versus 200mA) affect circuit design?

A: The higher current rating provides design margin and does not require circuit modification. The part will operate at the original 200mA load without stress. External component selection (inductors, capacitors) remains based on the actual application current requirement, not the IC rating.

Q: Can buck topology parts (LM3404HVMRX/NOPB, LM3414HVSDX/NOPB) replace the SC603IMLTRT?

A: Buck topology parts require higher input voltage than the original charge pump design. The LM3404HVMRX/NOPB requires minimum 6V input, exceeding the SC603IMLTRT's 2.5V minimum. The LM3414HVSDX/NOPB requires 4.5V minimum. These parts are suitable only if the application power supply can provide these higher voltages. Circuit topology and external components must be redesigned.

Q: What package considerations apply when selecting a substitute?

A: The original SC603IMLTRT uses 10-VFDFN (3x3mm) package. Substitute packages vary: LTC3214EDD#PBF uses 10-DFN (3x3mm) with similar footprint; boost topology parts use smaller packages (SOT-23-6, 8-MSOP); buck topology parts use larger packages (8-PowerSOIC, 8-WSON). Package selection affects PCB layout, thermal management, and board space allocation. Verify PCB design compatibility before final selection.

Q: Are there supply chain advantages to selecting one substitute over another?

A: All recommended active substitutes are manufactured by established semiconductor suppliers (Analog Devices, Texas Instruments, Lumissil, Monolithic Power Systems) with global distribution networks. Inventory availability varies by distributor and region. LTC3214EDD#PBF and LM3414HVSDX/NOPB show higher inventory levels (2000 and 9300 units respectively) in current stock, suggesting better near-term availability.

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