LM5164QDDARQ1 - 100V 1A Sync Buck Regulator | Texas Instruments
MPN: LM5164QDDARQ1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.9 | $2.90 |
| 10 | $2.62 | $26.20 |
| 100 | $2.3 | $230.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.95 | $1,950.00 |
Drop-in alternatives for LM5164QDDARQ1 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:
LM5164DDAR
β Drop-Inβ In Stock
$1.82 / Unit
View Datasheet βLM5164DDAT
β Drop-Inπ Reference alternative (not in catalog)
LM5163DDAR
β Drop-Inπ Reference alternative (not in catalog)
LM5163QDDARQ1
β Drop-Inπ Reference alternative (not in catalog)
LM5164QDDARQ1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) |
| Input Voltage Range | 6 V to 100 V |
| Maximum Output Current | 1 A |
| Output Type | Positive Adjustable |
| Minimum Output Voltage | 1.2 V |
| Minimum On-Time | 50 ns |
| Switching Frequency | [DATA_NEEDED: switching frequency] |
| Quiescent Current | Ultra-low IQ [DATA_NEEDED: exact value] |
| Internal Soft-Start Time | 3.5 ms (fixed) |
| Protection Features | Peak current-limit protection |
| PGOOD Output | Open-drain PGOOD indicator |
| Operating Junction Temperature | -40C to +125C |
| Package | 8-PowerSOIC (SO PowerPAD, DDA, 3.90mm width) |
| Pin Pitch | 1.27 mm |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 Grade 1 |
LM5164QDDARQ1 Pin Configuration
| Pin 1 | VIN β Input supply voltage, 6V to 100V |
| Pin 2 | EN β Enable input with internal UVLO adjustability |
| Pin 3 | AGND β Analog ground reference |
| Pin 4 | FB β Feedback input for output voltage setting |
| Pin 5 | PGOOD β Open-drain power-good indicator |
| Pin 6 | SW β Switching node (internal high/low-side MOSFETs) |
| Pin 7 | BOOT β Bootstrap capacitor for high-side gate drive |
| Pin 8 | PGND β Power ground for switching currents |
| Pin 9 | PAD β Exposed PowerPAD, must be soldered to PCB ground plane for thermal dissipation |
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
LM5164QDDARQ1 is suitable for 6 applications: Automotive 48V Rail Power Supply, Industrial 24V Bus Power, Isolated Converter Auxiliary Bias, Automotive Body Electronics and Lighting, Battery-Powered Test and Telemetry Equipment, Telecom and Server Auxiliary Rails.
Automotive 48V Rail Power Supply
The LM5164QDDARQ1 is ideal for automotive 48V mild-hybrid and zonal architectures because its 100V maximum input absorbs load-dump transients and its 50ns minimum on-time enables direct 48V-to-5V or 48V-to-3.3V conversion without an intermediate stage. AEC-Q100 Grade 1 qualification and the -40C to +125C junction range meet automotive reliability requirements. Placed as a point-of-load front-end with the PowerPAD soldered to a ground plane, it delivers the full 1A while eliminating external surge suppression components, reducing BOM cost and board area.
Recommended
Industrial 24V Bus Power
Industrial 24V buses routinely see spikes well above the nominal rail; the LM5164QDDARQ1's 6V to 100V input range covers these transients directly. The ultra-low quiescent current benefits always-on factory automation and sensor nodes where standby losses dominate energy budgets, while the open-drain PGOOD output supports fault reporting to a PLC or supervisory MCU. The adjustable output down to 1.2V powers 5V logic, 3.3V microcontrollers, and analog rails from the same footprint, simplifying design standardization across a product family.
Recommended
Isolated Converter Auxiliary Bias
High-voltage isolated systems need a small, efficient bias supply to power gate drivers and controllers. The LM5164QDDARQ1 steps down rectified high-voltage DC buses (up to 100V) to a 5V or 12V bias rail using a fly-buck or post-regulated topology. Its 50ns minimum on-time maintains regulation at large step-down ratios, and the fixed 3.5ms soft-start gives controlled bias ramp for predictable gate-driver startup. Peak current-limit protection guards against bias-rail faults in traction inverters and servo drives.
Recommended
Automotive Body Electronics and Lighting
Body control modules, LED headlights, and infotainment units draw modest continuous current from 12V or 48V automotive rails but must survive harsh transients. The LM5164QDDARQ1's synchronous rectification maximizes light-load and full-load efficiency, reducing thermal stress in sealed enclosures. The PGOOD output allows the MCU to sequence peripheral power, and the DDA package's 1.27mm pin pitch supports high-voltage creepage requirements. AEC-Q100 Grade 1 qualification removes the need for component deviation requests in automotive production programs.
Recommended
Battery-Powered Test and Telemetry Equipment
Portable and battery-backed instrumentation benefits from the LM5164QDDARQ1's ultra-low standby current, extending quiescent battery life between charges. Its wide input range accepts stacked lithium-ion packs and industrial adapters directly, and synchronous rectification keeps efficiency high across the load range so the converter itself contributes minimal self-heating during precision measurements. The 1.2V minimum adjustable output suits low-voltage analog and digital rails, while the fixed soft-start prevents inrush that could disturb sensitive measurement front ends.
Recommended
Telecom and Server Auxiliary Rails
Telecom negative-48V-referenced and datacenter sub-systems often derive local logic power from rectified 48V buses. The LM5164QDDARQ1 converts these buses to 3.3V or 5V auxiliary rails with high efficiency and minimal external components. Its 100V rating provides margin against ring transients on long distribution cables, and PGOOD-based sequencing ensures downstream FPGAs and processors power up in the correct order. The compact 8-pin SO PowerPAD footprint fits dense power trees where board area is constrained.
Recommended
Recommended Products Summary
Engineering reference data for LM5164QDDARQ1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5164DDAR | LM5164DDAT | LM5163DDAR | LM5163QDDARQ1 |
|---|---|---|---|---|---|
| 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 |
| Max Input Voltage | 100 V | 100 V | 100 V | [DATA_NEEDED] lower than 100V | [DATA_NEEDED] lower than 100V |
| Output Current | 1 A | 1 A | 1 A | 1.5 A | 1.5 A |
| Minimum Output Voltage | 1.2 V | 1.2 V | 1.2 V | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive Qualification | AEC-Q100 Grade 1 | Not qualified (standard grade) | Not qualified (standard grade) | Not qualified (standard grade) | AEC-Q100 Grade 1 |
| PGOOD Output | Yes (open-drain) | Yes (open-drain) | Yes (open-drain) | [DATA_NEEDED] | [DATA_NEEDED] |
| Price (qty 100, as of 2026-08-29) | $2.30 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- AEC-Q100 Grade 1 automotive qualification (vs LM5164DDAR)
- 100V maximum input with 50ns minimum on-time (vs LM5163DDAR)
- Ultra-low quiescent current for light-load efficiency (vs LM5163QDDARQ1)
Design Notes
The LM5164QDDARQ1 uses an 8-pin SO PowerPAD (DDA) package whose exposed pad is the primary thermal path. Solder the PowerPAD to a PCB ground plane with an array of thermal vias (typically 4-6 filled vias) to achieve the low theta_JA required for continuous 1A operation at high input voltages. Power dissipation rises with switching losses at 100V input; verify junction temperature stays below +125C using TI's thermal guidelines in the LM5164-Q1 datasheet layout section.
Keep the SW node, BOOT capacitor, and input ceramic capacitor loops as short as possible to minimize high-frequency radiated EMI - important for automotive CISPR environments. Place the FB divider close to the AGND pin away from the switching node. The 1.27mm pin pitch aids high-voltage creepage but maintain additional spacing between VIN and SW traces above 60V operation. Follow TI datasheet PCB layout example for the DDA package.
The 50ns minimum controllable on-time is the hard limit on step-down ratio: at 100V input and practical switching frequency, minimum output voltage headroom applies - do not attempt extreme step-down ratios without computing on-time margin or the converter will enter pulse-skipping and increase ripple. Also note the fixed 3.5ms soft-start is not adjustable; ensure downstream loads tolerate this ramp. Set EN/UVLO resistor divider above the 6V minimum input for clean startup behavior.
Compliance Information
AEC-Q100 Grade 1 qualified per TI product page. RoHS/lead-free inferred from standard TI automotive production packaging; formal REACH and halogen-free declarations should be pulled from TI quality documentation.
