LM3561TMX/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3561TMX/NOPB is a Texas Instruments LED Driver IC designed for camera flash applications. It integrates a step-up (boost) DC-DC regulator with I2C dimming control, delivering 600mA flash current from a 2.5V to 5.5V supply. The device operates at 2MHz switching frequency and is housed in a 12-DSBGA package. Product status is Active with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the LM3561TMX/NOPB reaches end-of-life, inventory constraints occur, or design requirements shift toward alternative topologies, dimming methods, or current ratings while maintaining core LED driver functionality.

Key Parameters

Parameter	LM3561TMX/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Voltage Supply (Min)	2.5V
Voltage Supply (Max)	5.5V
Current Output / Channel	600mA (Flash)
Frequency	2MHz
Dimming Control	I2C
Applications	Camera Flash
Package / Case	12-WFBGA, DSBGA
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution logic is based on the following allowed electrical and mechanical parameters:

Primary Substitution Criteria:

Topology: Step-Up (Boost) DC-DC Regulator
Supply voltage range compatibility: 2.5V to 5.5V input
Output current capability: 600mA or greater for flash applications
Dimming control method: I2C or PWM
Package type: Surface mount (12-DSBGA, WLCSP, SOT-23-6, or equivalent)
Operating temperature range: -40°C to 85°C minimum
RoHS3 compliance and MSL rating

Secondary Substitution Criteria:

Switching frequency: 1MHz to 3MHz acceptable range
Internal switch integration: Required
Single output configuration: Required
Compliance certifications: REACH Unaffected, EAR99 classification

Substitutes are grouped into two categories:

Category A - Parametric Equivalents (Identical Specifications): Parts with matching supply voltage, output current, topology, and I2C dimming control. These provide direct functional replacement with minimal design changes.

Category B - Functional Alternatives (Modified Specifications): Parts with different dimming methods (PWM vs. I2C), alternative package types, or adjusted current ratings. These require design review but maintain core LED driver functionality for camera flash or backlight applications.

Parameter Comparison

Part Number	Manufacturer	Topology	Supply Min / Max	Output Current	Dimming	Frequency	Package	Temp Range	Product Status
LM3561TMX/NOPB	Texas Instruments	Step-Up (Boost)	2.5V / 5.5V	600mA (Flash)	I2C	2MHz	12-DSBGA	-40°C ~ 85°C	Active
LM3561TME/NOPB	Texas Instruments	Step-Up (Boost)	2.5V / 5.5V	600mA (Flash)	I2C	2MHz	12-DSBGA	-40°C ~ 85°C	Active
ADP1650ACBZ-R7	Analog Devices Inc.	Step-Up (Boost)	2.7V / 5V	1.5A (Flash)	I2C	1.5MHz, 3MHz	12-WLCSP	-40°C ~ 85°C	Active
ADP1655ACBZ-R7	Analog Devices Inc.	Step-Up (Boost)	2.7V / 5.5V	500mA (Flash)	I2C	2MHz	12-WLCSP	-40°C ~ 85°C	Active
AP5724WG-7	Diodes Incorporated	Step-Up (Boost)	2.7V / 5.5V	750mA (Switch)	PWM	1.2MHz	SOT-26	-40°C ~ 85°C	Active
AP5726WG-7	Diodes Incorporated	Step-Up (Boost)	2.7V / 5.5V	750mA (Switch)	PWM	1.2MHz	SOT-26	-40°C ~ 85°C	Active
IS31BL3508A-TTLS2-TR	Lumissil Microsystems	Step-Up (Boost)	2.7V / 5.5V	1.6A (Switch)	Analog, PWM	1MHz	TSOT-23-6	-40°C ~ 85°C	Active
LT1932ES6#TRMPBF	Analog Devices Inc.	Step-Up (Boost)	1V / 10V	40mA	PWM	1.2MHz	TSOT-23-6	-40°C ~ 85°C	Active
LT1937ES5#TRMPBF	Analog Devices Inc.	Step-Up (Boost)	2.5V / 10V	320mA (Switch)	Analog, PWM	1.2MHz	TSOT-23-5	-40°C ~ 85°C	Active
BD60910GU-E2	ROHM Semiconductor	Step-Up (Boost)	2.7V / 5.5V	25.6mA	PWM	1MHz	VCSP85H3	-40°C ~ 85°C	Not For New Designs
A6216KLPTR-T	Allegro MicroSystems	Step-Down (Buck)	4.5V / 55V	2A	Analog, PWM	—	16-eTSSOP-EP	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

LM3561TME/NOPB is the parametric equivalent to LM3561TMX/NOPB. Both devices share identical electrical specifications, I2C dimming control, 600mA flash current capability, and 12-DSBGA packaging. This part provides direct substitution with no design modifications required. Both are Active status with ROHS3 compliance and MSL 1 rating.

I2C Dimming Alternatives (Camera Flash Optimized):

ADP1650ACBZ-R7 and ADP1655ACBZ-R7 (Analog Devices Inc.) maintain I2C dimming control and step-up topology. ADP1650ACBZ-R7 delivers higher flash current (1.5A) with selectable switching frequency (1.5MHz or 3MHz) in 12-WLCSP package. ADP1655ACBZ-R7 provides 500mA flash current at 2MHz in the same package footprint. Both operate within 2.7V to 5V (ADP1650) or 2.7V to 5.5V (ADP1655) supply range. Package transition from 12-DSBGA to 12-WLCSP requires PCB layout review. Both are Active status with ROHS3 compliance and MSL 1 rating.

PWM Dimming Alternatives (Backlight / General LED Driver):

AP5724WG-7 and AP5726WG-7 (Diodes Incorporated) provide PWM dimming with 750mA switch current in compact SOT-26 package. Both operate 2.7V to 5.5V supply range at 1.2MHz. These are suitable for backlight applications where I2C control is not required. Package change from 12-DSBGA to SOT-26 significantly reduces board space. Both are Active status with ROHS3 compliance and MSL 1 rating.

IS31BL3508A-TTLS2-TR (Lumissil Microsystems) offers analog and PWM dimming with 1.6A switch current in TSOT-23-6 package. Operating range 2.7V to 5.5V at 1MHz. Supports both analog and PWM control methods. Active status with ROHS3 compliance and MSL 3 rating (168 hours).

LT1937ES5#TRMPBF (Analog Devices Inc.) provides analog and PWM dimming with 320mA switch current in TSOT-23-5 package. Extended supply range 2.5V to 10V at 1.2MHz. Active status with ROHS3 compliance and MSL 1 rating.

Not Recommended for New Designs:

BD60910GU-E2 (ROHM Semiconductor) is marked "Not For New Designs" despite matching topology and supply range. This part carries MSL 6 (time on label) moisture sensitivity rating, indicating higher handling risk. Avoid selection for new production unless legacy compatibility is mandatory.

Topology Deviation (Not Recommended):

A6216KLPTR-T (Allegro MicroSystems) uses step-down (buck) topology instead of step-up (boost), operates at higher supply voltage (4.5V to 55V), and includes automotive qualification (AEC-Q100). This part is fundamentally incompatible with the LM3561TMX/NOPB design intent and should not be selected as a substitute.

Frequently Asked Questions (FAQ)

Q: Can LM3561TME/NOPB replace LM3561TMX/NOPB directly?

A: Yes. LM3561TME/NOPB is a parametric equivalent with identical electrical specifications, I2C dimming control, 600mA flash current, and 12-DSBGA packaging. No design changes are required.

Q: What is the difference between I2C and PWM dimming control?

A: I2C dimming uses digital serial communication for precise brightness control via software commands, suitable for camera flash applications requiring programmable intensity levels. PWM dimming uses pulse-width modulation for analog brightness control, simpler to implement but less flexible. The LM3561TMX/NOPB uses I2C; PWM alternatives require firmware modification.

Q: Can I use ADP1650ACBZ-R7 as a drop-in replacement?

A: ADP1650ACBZ-R7 maintains I2C dimming and step-up topology with higher flash current (1.5A vs. 600mA). Package changes from 12-DSBGA to 12-WLCSP require PCB layout verification. Supply voltage range shifts from 2.5V–5.5V to 2.7V–5V. Functional compatibility is confirmed; physical integration requires design review.

Q: Why is BD60910GU-E2 marked "Not For New Designs"?

A: BD60910GU-E2 carries MSL 6 (time on label) moisture sensitivity rating, indicating higher risk during storage and assembly. Manufacturers typically restrict such parts to legacy support only. Select active-status alternatives for new production.

Q: What is the advantage of ADP1650ACBZ-R7 over LM3561TMX/NOPB?

A: ADP1650ACBZ-R7 delivers 1.5A flash current (2.5× higher than 600mA), supports dual switching frequencies (1.5MHz or 3MHz for design flexibility), and maintains I2C control. Trade-off is package change from 12-DSBGA to 12-WLCSP and narrower maximum supply voltage (5V vs. 5.5V).

Q: Can PWM alternatives like AP5724WG-7 work in my camera flash design?

A: AP5724WG-7 provides PWM dimming instead of I2C, requiring firmware redesign for brightness control. It delivers 750mA switch current (exceeding 600mA requirement) in compact SOT-26 package. Electrical compatibility is confirmed; control architecture must be modified.

Q: What does MSL 1 (Unlimited) mean?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. Parts can be stored indefinitely in standard conditions. MSL 3 (168 hours) or higher requires moisture baking before reflow soldering. LM3561TMX/NOPB and most recommended substitutes carry MSL 1 rating.

Q: Is the 12-WLCSP package compatible with 12-DSBGA PCB layouts?

A: 12-WLCSP and 12-DSBGA are both 12-pin ball grid arrays with similar footprints but different ball pitch and solder ball composition. Physical compatibility requires verification of exact ball pitch, pad diameter, and solder paste stencil design. Consult package datasheets before PCB reuse.

Q: Why does A6216KLPTR-T appear in the substitute list if it uses buck topology?

A: A6216KLPTR-T is listed as a reference point only. Its step-down (buck) topology is fundamentally incompatible with the LM3561TMX/NOPB boost architecture. Do not select this part as a substitute.

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