Specifications
| Type | Description |
|---|---|
| Part Number | LM3423 |
| Manufacturer | Texas Instruments |
| Product Type | LDO Regulator |
| Category | Power Management |
| Component Type | Power_IC |
| Package Case | 20-pin HTSSOP (PWP), 6.50 mm x 4.40 mm nominal body |
| Input Voltage Range | 4.5 to 75 V; recommended operating condition |
| Operating Junction Temperature | -40 to 125 °C; LM3423 recommended operating condition |
| Package | HTSSOP-20 (PWP), 6.50 mm x 4.40 mm; LM3423 device information |
| LED Output Status Flag | Yes; LM3423 device comparison |
| Fault Status Flag | Yes; LM3423 device comparison |
| Qualification | Commercial Grade; LM3423 device comparison |
| Controller Topologies | Buck, boost, buck-boost, SEPIC; application description |
| Switching Frequency Capability | Up to 2 MHz; internal PWM controller description |
| MOSFET Gate Driver | 2 Ω, 1 A peak; feature list |
| Absolute Maximum VIN, EN, RPD, nDIM Voltage | -0.3 to 76 V; absolute maximum ratings |
| Absolute Maximum OVP, HSP, HSN, LRDY, FLT, DPOL Voltage | -0.3 to 76 V; absolute maximum ratings |
| Absolute Maximum VCC Voltage | -0.3 to 8 V; absolute maximum ratings |
| Absolute Maximum TIMR Voltage | -0.3 to 7 V; absolute maximum ratings |
| Absolute Maximum COMP, CSH Voltage | -0.3 to 6 V; absolute maximum ratings |
| Storage Temperature | -65 to 150 °C; absolute maximum ratings |
| Lead Temperature | 260 °C max; solder and reflow maximum lead temperature |
| ESD Rating, HBM | ±2000 V; ANSI/ESDA/JEDEC JS-001 |
| ESD Rating, CDM | ±500 V; JEDEC JESD22-C101 |
| Junction-to-Ambient Thermal Resistance | 36.7 °C/W; LM3423 PWP HTSSOP-20 |
| Junction-to-Case Top Thermal Resistance | 21.5 °C/W; LM3423 PWP HTSSOP-20 |
| Junction-to-Board Thermal Resistance | 18 °C/W; LM3423 PWP HTSSOP-20 |
| Junction-to-Case Bottom Thermal Resistance | 1.9 °C/W; LM3423 PWP HTSSOP-20 |
| VCC Regulation Voltage | 6.3 to 7.35 V, 6.9 V typ; ICC=0 mA, typical at TA=25°C |
| VCC Current Limit | 20 mA typ, 25 mA typ at 25°C; VCC=0 V |
| Quiescent Current | 3 mA typ, 2 mA typ at 25°C; VEN=3 V, static |
| Shutdown Current | 1 µA typ, 0.1 µA typ at 25°C; VEN=0 V |
| VCC UVLO Threshold | 4.5 V typ increasing; 3.7 V typ decreasing; VCC increasing/decreasing |
| VCC UVLO Hysteresis | 0.1 V typ; TA=25°C |
| EN Start-up Threshold | 2.4 V typ increasing; 0.8 V typ decreasing; VEN increasing/decreasing |
| EN Start-up Hysteresis | 0.1 V typ; TA=25°C |
| EN Pulldown Resistance | 0.245 to 2.85 MΩ, 0.82 MΩ typ; VEN=1 V, typical at TA=25°C |
| CSH High Fault Threshold | 1.6 V typ; CSH increasing, TA=25°C |
| CSH Low Condition on LRDY Pin | 1 V typ; LM3423, CSH increasing, TA=25°C |
| OVP OVLO Threshold | 1.185 to 1.285 V, 1.24 V typ; OVP increasing, typical at TA=25°C |
| OVP Hysteresis Source Current | 20 to 25 µA, 23 µA typ; OVP active high, typical at TA=25°C |
| DPOL Logic Threshold | 2 to 2.6 V; DPOL increasing |
| Datasheet Status | request_only |
Product Overview
The LM3423 is a Texas Instruments constant-current LED driver controller in the Power_Management category. It is intended for LED controller implementations using buck, boost, buck-boost, or SEPIC topologies, with an internal PWM controller specified for switching frequency capability up to 2 MHz.
The recommended operating input voltage range is 4.5 to 75 V, and the recommended operating junction temperature range is -40 to 125 °C. The device includes a 2 Ω, 1 A peak MOSFET gate driver, LED output status flag support, and fault status flag support.
The package is HTSSOP-20 (PWP), with a 6.50 mm x 4.40 mm nominal body. Thermal data for this package includes 36.7 °C/W junction-to-ambient resistance, 21.5 °C/W junction-to-case top resistance, 18 °C/W junction-to-board resistance, and 1.9 °C/W junction-to-case bottom resistance. Assembly-related limits include 260 °C maximum lead temperature for solder and reflow conditions.
Key Features
- Constant-current LED driver controller for Power_Management designs
- Supports buck, boost, buck-boost, and SEPIC topologies
- Recommended 4.5 to 75 V input voltage range
- Up to 2 MHz switching frequency capability
- 2 Ω MOSFET gate driver with 1 A peak drive
- LED output status flag included on LM3423
- Fault status flag included on LM3423
- Commercial grade device qualification
- HTSSOP-20 PWP package, 6.50 mm x 4.40 mm
- -40 to 125 °C operating junction temperature
Typical Applications
- Constant-current LED driving
- Buck LED driver designs
- Boost LED driver designs
- Buck-boost LED driver designs
- SEPIC LED driver designs
- Power_Management LED controller designs
Procurement Notes
When requesting a quote for LM3423, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For power IC and power device sourcing, voltage rating, current rating, power dissipation, package thermal performance, protection features, qualification grade and application conditions should be reviewed before approval.
FAQ
What type of device is the LM3423?
The LM3423 is a Texas Instruments constant-current LED driver controller in the Power_Management category. Extracted datasheet facts identify support for buck, boost, buck-boost, and SEPIC controller topologies.
What input voltage range is recommended for LM3423 operation?
The recommended operating input voltage range for the LM3423 is 4.5 to 75 V. The recommended operating junction temperature range is -40 to 125 °C for the LM3423.
Which package is specified for the LM3423?
The LM3423 package is HTSSOP-20 (PWP), with a 6.50 mm x 4.40 mm nominal body. Thermal data is provided for the LM3423 PWP HTSSOP-20 package.
Does the LM3423 include status flag functions?
Yes. Extracted LM3423 device comparison facts list an LED output status flag and a fault status flag. These status functions are specified as present for the LM3423.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 7, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.