LM5164QDDAR - 100V Input 1A Sync Buck Converter | TI
MPN: LM5164QDDAR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.31 | $2.31 |
| 10 | $2.08 | $20.80 |
| 100 | $1.85 | $185.00 |
| 500 | $1.66 | $830.00 |
| 1,000 | $1.49 | $1,490.00 |
Drop-in alternatives for LM5164QDDAR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LM5164QDDARQ1
β Drop-Inβ In Stock
$1.95 / Unit
View Datasheet βLM5163DDAR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
LM5160ADDAR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
LM5164DDAR
β Drop-Inβ In Stock
$1.47 / Unit
View Datasheet βLM5164QDDAR Maximum Ratings & Electrical Characteristics
| Topology | Synchronous step-down (buck) converter |
| Input Voltage Range | 6 V to 100 V |
| Output Voltage | Adjustable, minimum 1.2 V |
| Output Current | 1 A |
| Minimum Controllable On-Time | 50 ns |
| Soft-Start | Fixed internal 3.5 ms timer |
| Protection | Peak current-limit protection |
| PGOOD Output | Open-drain power-good indicator |
| Switching Frequency | Approximately 1 MHz (per distributor parametrics) |
| Junction Temperature Range | -40C to +125C (operating up to +150C per LCSC) |
| Package | 8-Pin SO PowerPAD (HSOIC/DDA, 3.90 mm width) |
| Pin Pitch | 1.27 mm |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 Grade 1 (LM5164-Q1) |
| Brand | Texas Instruments |
LM5164QDDAR 8-pin so powerpad (hsoic/dda, 3.90 mm width) Pin Configuration Guide
Complete pinout information for LM5164QDDAR (8-pin so powerpad (hsoic/dda, 3.90 mm width) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LM5164QDDAR.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LM5164QDDAR is suitable for 6 applications: 48-V Automotive Auxiliary Rails, Industrial 24/48-V PLC and Automation Supplies, Telecom and Server Rack Front Ends, Battery-Powered Portable Instruments, Solar and Energy-Harvesting Nodes, LED Lighting and Signage Drivers Front End.
48-V Automotive Auxiliary Rails
The LM5164QDDAR fits 48-V automotive battery systems (mild-hybrid and EV auxiliary supplies) because its 100-V input rating absorbs battery transients that would exceed 65-V-class converters, and its AEC-Q100 Grade 1 qualification covers -40C to +125C underhood conditions. The converter steps the 48-V nominal rail directly down to 3.3 V or 5 V in a single stage using its 50-ns minimum on-time, eliminating an intermediate 12-V stage and reducing component count. The open-drain PGOOD output enables sequenced power-up of downstream processors, while peak current limiting protects against board-level faults during cranking transients. Place the converter near the connector with tight input decoupling to control EMI per CISPR-class automotive requirements.
Recommended
Industrial 24/48-V PLC and Automation Supplies
In industrial PLCs, motor drives, and factory automation, auxiliary rails are derived from 24-V or 48-V buses with wide tolerances and surge events; the LM5164QDDAR's 6-V to 100-V input range and peak current-limit protection make it well suited here. Its ultra-low quiescent current benefits always-on standby and condition-monitoring nodes. The 50-ns minimum on-time allows direct 48-V to 5-V conversion for logic supplies, while the 3.5-ms internal soft-start prevents inrush trips on current-limited DIN-rail supplies. The SO PowerPAD-8 package with 1.27-mm pitch provides high-voltage creepage spacing valued in industrial control boards, and the exposed pad simplifies thermal design on standard 2-oz copper PCBs.
Recommended
Telecom and Server Rack Front Ends
Telecom infrastructure rectifies -48-V bus inputs whose voltage swings demand wide-range converters; the LM5164QDDAR's 100-V rating gives margin over absolute-max bus excursions, reducing external TVS and fuse sizing. The converter's ultra-low IQ supports standby card power, and the PGOOD flag reports rail health to hot-swap supervisory logic. Stepping from a nominal 48-V rail to a 5-V or 3.3-V intermediate bus in one stage improves end-to-end efficiency versus cascaded converters. The approximately 1-MHz switching frequency keeps magnetics small for blade-card footprints, and peak current-mode control eases compensation across widely varying input conditions found in distributed power architectures.
Recommended
Battery-Powered Portable Instruments
Portable test instruments and field meters powered by high-voltage battery stacks (e.g., 10-series lithium cells up to ~42 V, or 48-V tool packs) benefit from the LM5164QDDAR's direct high-voltage buck capability and very low standby quiescent current, extending battery life in idle and sleep modes. The 3.5-ms soft-start and internal protection reduce external component count in compact handheld enclosures. Its synchronous topology delivers high efficiency at moderate loads, minimizing heatsink needs, while the adjustable 1.2-V minimum output supports modern low-voltage MCUs, displays, and RF modules from a single wide-input front-end stage, simplifying the power tree in space-constrained designs.
Recommended
Solar and Energy-Harvesting Nodes
Off-grid IoT and monitoring nodes harvesting from 12-V/24-V solar panels with wide open-circuit voltage swings (up to ~60-100 V for long strings) match well with the LM5164QDDAR's 100-V input ceiling, avoiding damage during cold-temperature Voc excursions. Ultra-low quiescent current maximizes harvested-energy utilization for duty-cycled sensor transmitters, and the wide 6-V minimum input accommodates shaded-panel conditions. The PGOOD output can gate MCU boot after the rail is stable, preventing brownout corruption. Because these nodes often sit outdoors, the -40C to +125C junction range and simple PowerPAD thermal layout support conformal-coated, passively cooled enclosures without forced airflow.
Recommended
LED Lighting and Signage Drivers Front End
High-brightness LED signage and industrial luminaires often run from rectified AC (creating ~120-370 V DC after regulation stages) or from 48-V constant-voltage bus rails; the LM5164QDDAR serves as the auxiliary housekeeping supply in these luminaires, powering MCU, dimming logic, and communication transceivers from up to 100 V DC. Its wide input removes the need for a discrete pre-regulator, and peak current limiting protects the supply during LED-string short faults. Synchronous operation improves light-fixture efficiency and thermal margin inside sealed enclosures, while the 1-MHz-class switching keeps inductor size compatible with compact driver boards and helps push switching noise above sensitive dimming bandwidths.
Recommended
Recommended Products Summary
Engineering reference data for LM5164QDDAR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5164QDDARQ1 | LM5164DDAR | LM5163DDAR | LM5160ADDAR |
|---|---|---|---|---|---|
| Package | SO PowerPAD-8 (DDA) | SO PowerPAD-8 (DDA) - same | SO PowerPAD-8 (DDA) - same | SO PowerPAD-8 (DDA) - same | SO PowerPAD-8 (DDA) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 6 V to 100 V | 6 V to 100 V | 6 V to 100 V | [DATA_NEEDED] (65-V class) | [DATA_NEEDED] (65-V class) |
| Output Current | 1 A | 1 A | 1 A | [DATA_NEEDED] (1.5-A class) | [DATA_NEEDED] (1.5-A class) |
| Minimum Output Voltage | 1.2 V adjustable | 1.2 V adjustable | 1.2 V adjustable | [DATA_NEEDED] | [DATA_NEEDED] |
| Minimum On-Time | 50 ns | 50 ns | 50 ns | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive Qualification | AEC-Q100 Grade 1 (Q1) | AEC-Q100 Grade 1 | Non-automotive | [DATA_NEEDED] | [DATA_NEEDED] |
| Unit Price (qty 1) | $2.31 (as of 2026-09-01) | $2.30+ (LCSC) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- 100-V input rating eliminates surge-suppression stages (vs LM5163DDAR)
- 50-ns minimum on-time enables single-stage 48-V step-down (vs LM5163DDAR)
- Automotive AEC-Q100 Grade 1 qualification (vs LM5164DDAR)
Design Notes
The SO PowerPAD (DDA) package requires the exposed pad to be soldered to a PCB thermal land. Estimated: at VIN = 48 V, VOUT = 5 V, IOUT = 1 A, assuming ~88% efficiency, dissipation is roughly (5/0.88 - 5) x 1 = 0.68 W; verify against the datasheet theta-JA with your copper area to keep Tj below 125C. Use a via array (e.g., 4-9 thermal vias) from the PowerPAD to internal ground planes per the TI datasheet layout section.
Keep the input decoupling loop (VIN cap to PGND) and the SW node compact; the high-voltage switching node is the dominant EMI source. The 1.27-mm pin pitch eases high-voltage creepage, but maintain clearance from SW to adjacent low-voltage traces on outer layers. Place the feedback divider away from SW and inductor, and route FB as a short Kelvin trace to the output capacitor.
Do not omit the bootstrap capacitor or undersize the input ceramic capacitance - large VIN-VOUT step-downs rely on the 50-ns minimum on-time being achieved with clean switching edges. Remember the 3.5-ms soft-start is fixed: external SS capacitors for longer ramps are not supported the same way as adjustable-SS devices, so plan supply sequencing around PGOOD and the enable/UVLO pin instead.
Compliance Information
AEC-Q100 Grade 1 qualification confirmed from TI product page for the LM5164-Q1. RoHS/REACH/lead-free status not stated in the provided verified data; consult TI's product page or eco datasheet for environmental compliance details.
