LM3432MH/NOPB LED Driver IC Equivalent & Substitute Parts

Part Overview

The LM3432MH/NOPB is a 6-output LED driver IC manufactured by Texas Instruments, designed for backlight applications with step-up (boost) topology and internal switching capability. This part operates across a 6V to 40V supply range with 80V output capability and supports both analog and PWM dimming modes. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM3432MH/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Up (Boost)
Number of Outputs	6
Voltage - Supply (Min)	6V
Voltage - Supply (Max)	40V
Voltage - Output	80V
Current - Output / Channel	40mA
Dimming	Analog, PWM
Internal Switch(s)	Yes
Package / Case	28-PowerTSSOP (0.173", 4.40mm Width)
Operating Temperature	-40°C ~ 125°C (TJ)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM3432MH/NOPB is determined by the following critical parameters:

Topology: Step-Up (Boost) with internal switching capability
Number of Outputs: 6 outputs for multi-channel LED control
Supply Voltage Range: Minimum 6V input capability
Output Voltage: Capability to reach or exceed 80V
Current per Channel: Minimum 40mA output current
Dimming Support: Analog and/or PWM dimming capability
Package Compatibility: Surface mount packages suitable for backlight applications
Operating Temperature: Extended range support (-40°C minimum)

Substitute parts are grouped into two categories based on topology and electrical characteristics:

Category A - Step-Up (Boost) Regulators with Internal Switches: Parts maintaining the same boost topology with integrated switching elements, supporting 6 outputs and high voltage output capability.

Category B - Alternative Topologies: Parts using switched capacitor (charge pump) or controller-based architectures that provide functional equivalence for specific application requirements.

Parameter Comparison

Parameter	LM3432MH/NOPB	TPS61196PWPT	BD9470AEFV-E2	ISL97671AIRZ-T	ISL97693IRTZ-T	LED7706TR	LT3598EFE#TRPBF
Manufacturer	Texas Instruments	Texas Instruments	Rohm Semiconductor	Renesas Electronics	Renesas Electronics	STMicroelectronics	Analog Devices Inc.
Type	DC DC Regulator	DC DC Controller	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)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)	Step-Up (Boost)
Number of Outputs	6	6	6	6	6	6	6
Internal Switch(s)	Yes	No	Yes	Yes	Yes	Yes	Yes
Voltage - Supply (Min)	6V	8V	9V	4.5V	2.4V	4.5V	3V
Voltage - Supply (Max)	40V	30V	35V	26.5V	5.5V	36V	30V
Voltage - Output	80V	120V	Not Specified	45V	26V	36V	44V
Current - Output / Channel	40mA	400mA	250mA	50mA	30mA	30mA	30mA
Dimming	Analog, PWM	PWM	PWM	PWM	PWM	PWM	Analog, PWM
Operating Temperature (Min)	-40°C	-40°C	-40°C	-40°C	-40°C	-40°C	-40°C
Operating Temperature (Max)	125°C (TJ)	85°C (TA)	85°C (TA)	85°C (TA)	85°C (TA)	150°C (TJ)	125°C (TJ)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

TPS61196PWPT and BD9470AEFV-E2 maintain the same 28-HTSSOP package footprint and 6-output boost topology. Both are active products with ROHS3 compliance. TPS61196PWPT operates as a controller (no internal switch) requiring external switching elements, while BD9470AEFV-E2 retains internal switching. BD9470AEFV-E2 operates within a 9V to 35V supply range, requiring design verification for applications below 9V input.

LED7706TR provides the closest electrical match with 6 outputs, step-up topology, internal switching, and extended operating temperature to 150°C (TJ). The 24-VFQFPN package differs from the original 28-HTSSOP, requiring PCB layout redesign.

LT3598EFE#TRPBF supports both analog and PWM dimming like the original part, operates across 3V to 30V supply range, and achieves 44V output. The 24-TSSOP package requires layout modification. This part is active with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Secondary Substitutes (Application-Dependent)

ISL97671AIRZ-T and ISL97672BIRZ-T are 20-QFN packages with 6 outputs and step-up topology. ISL97671AIRZ-T supports 50mA per channel with 45V output across 4.5V to 26.5V supply. ISL97672BIRZ-T provides frequency range of 200kHz to 1.5MHz. Both require package transition from 28-HTSSOP.

ISL97693IRTZ-T operates at lower supply voltages (2.4V to 5.5V) with 30mA per channel and 26V output in a 16-TQFN package. This part is suitable for low-voltage backlight applications only.

Compliance and Certification

All substitute parts listed maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity levels range from MSL 1 (LT3598EFE#TRPBF) to MSL 3 (most others). Operating temperature ranges vary; applications requiring extended high-temperature operation should prioritize LED7706TR (150°C TJ) or LT3598EFE#TRPBF (125°C TJ).

Frequently Asked Questions (FAQ)

Q: Can TPS61196PWPT directly replace LM3432MH/NOPB without external components?

A: No. TPS61196PWPT is a DC DC controller without internal switching elements, requiring external MOSFETs and associated circuitry. LM3432MH/NOPB includes integrated switches. Design modifications are necessary.

Q: What is the minimum supply voltage requirement for substitutes?

A: The original LM3432MH/NOPB requires 6V minimum. Substitutes vary: ISL97693IRTZ-T and ISL97694AIRTZ-TK operate from 2.4V, LT3598EFE#TRPBF from 3V, ISL97671AIRZ-T from 4.5V, and BD9470AEFV-E2 from 9V. Application supply voltage must be verified against selected substitute.

Q: Are package changes required for any substitutes?

A: Yes. TPS61196PWPT and BD9470AEFV-E2 maintain the 28-HTSSOP package. LED7706TR uses 24-VFQFPN, LT3598EFE#TRPBF uses 24-TSSOP, ISL97671AIRZ-T and ISL97672BIRZ-T use 20-QFN, ISL97693IRTZ-T uses 16-TQFN, and ISL97694AIRTZ-TK uses 20-QFN. PCB layout redesign is required for non-28-HTSSOP selections.

Q: Which substitute supports both analog and PWM dimming like the original?

A: LT3598EFE#TRPBF is the only substitute supporting both analog and PWM dimming modes. All other substitutes support PWM dimming only.

Q: What is the maximum output voltage capability of each substitute?

A: TPS61196PWPT reaches 120V, LT3598EFE#TRPBF reaches 44V, LED7706TR reaches 36V, ISL97671AIRZ-T reaches 45V, ISL97693IRTZ-T reaches 26V, and ISL97694AIRTZ-TK reaches 26V. The original LM3432MH/NOPB reaches 80V.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory certification.

Q: Which substitute has the best thermal performance?

A: LED7706TR supports the highest junction temperature at 150°C (TJ), followed by LM3432MH/NOPB and LT3598EFE#TRPBF at 125°C (TJ). All other substitutes are rated to 85°C (TA).

Q: Can ISL97693IRTZ-T replace LM3432MH/NOPB in high-voltage applications?

A: No. ISL97693IRTZ-T is limited to 5.5V maximum supply and 26V output, making it unsuitable for applications requiring the original part's 6V to 40V supply range and 80V output capability.

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