LM3648TTYFFR LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3648TTYFFR is a Texas Instruments LED Driver IC designed for camera flash applications. It functions as a 1.5A step-up (boost) DC-DC regulator with internal switching capability, operating from a 2.5V to 5.5V supply. The device is currently in active production status and maintains full RoHS3 compliance with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameters for LED driver applications, particularly where supply voltage ranges, output current ratings, topology, and package compatibility align with system requirements.

Key Parameters

Parameter	LM3648TTYFFR
Manufacturer	Texas Instruments
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	1
Voltage - Supply (Min)	2.5V
Voltage - Supply (Max)	5.5V
Current - Output / Channel	1.5A (Flash)
Frequency	4MHz
Package / Case	12-UFBGA, DSBGA
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the LM3648TTYFFR are classified based on the following critical parameters:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC Regulator
Output Configuration: Single output LED driver
Supply Voltage Range: Minimum 2.5V to 5.5V compatibility
Output Current: 1.5A or greater flash current capability
Internal Switch: Required
Applications: Camera Flash or equivalent LED driver function
Compliance: RoHS3 and REACH compliance maintained
Temperature Range: -40°C to 85°C operation

Secondary Considerations:

Package type and form factor (BGA, WLCSP, SOT-23, DFN)
Switching frequency (4MHz reference)
Dimming control method (analog, I2C, PWM, or none)
Inventory availability and production status

Substitutes are grouped by functional equivalence within these parameters. Parts with lower current ratings, incompatible topologies, or supply voltage ranges outside the specified window are not considered direct substitutes.

Parameter Comparison

Parameter	LM3648TTYFFR	ADP1649ACBZ-R7	LT3593ES6#TRMPBF	LTC3202EDD#PBF	LTC3490ES8#TRPBF	PAM2803AAF095
Manufacturer	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Diodes Incorporated
Type	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)
Number of Outputs	1	1	1	1	1	1
Voltage - Supply (Min)	2.5V	2.7V	2.7V	2.7V	1V	0.9V
Voltage - Supply (Max)	5.5V	5V	5.5V	4.5V	3.2V	5.5V
Current - Output / Channel	1.5A (Flash)	1A (Flash)	45mA	125mA	350mA	750mA
Frequency	4MHz	1.5MHz, 3MHz	1MHz	1.5MHz	1.3MHz	1MHz
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TJ)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitute - ADP1649ACBZ-R7 (Analog Devices Inc.)

The ADP1649ACBZ-R7 is the closest functional equivalent to the LM3648TTYFFR. Both devices employ step-up boost topology with single output configuration and are rated for camera flash applications. The ADP1649ACBZ-R7 operates within a 2.7V to 5V supply range (overlapping the LM3648TTYFFR's 2.5V to 5.5V range) and delivers 1A flash current. The primary trade-off is reduced output current (1A versus 1.5A). Both devices maintain active production status, RoHS3 compliance, and MSL 1 rating. The ADP1649ACBZ-R7 includes I2C dimming control, whereas the LM3648TTYFFR does not specify dimming capability. Package form factor differs (12-WLCSP versus 12-DSBGA), requiring PCB layout modification.

Secondary Substitutes - Current-Limited Applications

The LT3593ES6#TRMPBF, LTC3202EDD#PBF, LTC3490ES8#TRPBF, and PAM2803AAF095 are suitable only for applications where output current requirements are significantly lower than 1.5A. The LT3593ES6#TRMPBF is limited to 45mA, the LTC3202EDD#PBF to 125mA, the LTC3490ES8#TRPBF to 350mA, and the PAM2803AAF095 to 750mA. These devices are not direct substitutes for the LM3648TTYFFR in high-current flash applications but may serve in reduced-power LED driver scenarios.

Compliance and Production Status

All substitute parts maintain active production status and full RoHS3 compliance with unlimited moisture sensitivity (MSL 1). All devices operate within the -40°C to 85°C temperature range. REACH compliance status is unaffected for all parts listed.

Frequently Asked Questions (FAQ)

Q: Can the ADP1649ACBZ-R7 directly replace the LM3648TTYFFR in a camera flash circuit?

A: The ADP1649ACBZ-R7 is functionally equivalent for step-up boost LED driver applications but with reduced output current (1A versus 1.5A). Direct replacement is possible only if the application can operate at 1A flash current. The package form factor differs (12-WLCSP versus 12-DSBGA), requiring PCB layout redesign. Supply voltage compatibility is maintained within the overlapping 2.7V to 5V range.

Q: Why are the LT3593ES6#TRMPBF, LTC3202EDD#PBF, and LTC3490ES8#TRPBF listed as substitutes if their current ratings are much lower?

A: These devices are listed as manufacturer-identified substitutes but are not suitable for applications requiring 1.5A output current. They are appropriate only for reduced-power LED driver applications such as backlighting or indicator LEDs. The LT3593ES6#TRMPBF and LTC3490ES8#TRPBF maintain step-up boost topology, while the LTC3202EDD#PBF uses switched capacitor (charge pump) topology, which is fundamentally different.

Q: What is the significance of the supply voltage range differences between the LM3648TTYFFR and substitute parts?

A: The LM3648TTYFFR operates from 2.5V to 5.5V. The ADP1649ACBZ-R7 operates from 2.7V to 5V, which overlaps but does not fully cover the lower supply voltage limit (2.5V). The LTC3490ES8#TRPBF operates from 1V to 3.2V, which is incompatible with the LM3648TTYFFR's upper voltage range. Supply voltage compatibility must be verified for the specific application before substitution.

Q: Does the absence of specified dimming control on the LM3648TTYFFR affect substitution with the ADP1649ACBZ-R7, which includes I2C dimming?

A: The ADP1649ACBZ-R7's I2C dimming capability is an additional feature that does not prevent substitution. If the application does not require dimming control, the I2C interface can remain unused. If dimming is required, the ADP1649ACBZ-R7 provides this functionality as an enhancement over the LM3648TTYFFR.

Q: Are all substitute parts available in the same package type as the LM3648TTYFFR?

A: No. The LM3648TTYFFR uses a 12-DSBGA package. The ADP1649ACBZ-R7 uses 12-WLCSP (1.5x2), the LT3593ES6#TRMPBF uses TSOT-23-6, the LTC3202EDD#PBF uses 10-DFN (3x3), the LTC3490ES8#TRPBF uses 8-SO, and the PAM2803AAF095 uses SOT-23-6. Package differences require PCB layout modification and may affect thermal performance and board space requirements.

Q: What is the inventory status of these substitute parts?

A: All substitute parts are listed as new original stock. The LM3648TTYFFR has 6200 units available, the ADP1649ACBZ-R7 has 3800 units, the LT3593ES6#TRMPBF has 2051 units, the LTC3202EDD#PBF has 852 units, the LTC3490ES8#TRPBF has 2306 units, and the PAM2803AAF095 has 41100 units available.

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