LM5164QDDATQ1 - 100V 1A Sync Buck Converter | Texas Instruments
MPN: LM5164QDDATQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.62 | $36.20 |
| 100 | $2.96 | $296.00 |
| 500 | $2.42 | $1,210.00 |
| 1,000 | $2.05 | $2,050.00 |
LM5164QDDATQ1 Overview
A buck (step-down) DC-DC converter is a switched-mode power supply topology that uses an internal MOSFET switch, an external inductor, and a control loop to convert a higher DC input voltage into a lower regulated DC output voltage with high efficiency. Synchronous buck converters integrate both high-side and low-side FETs, replacing the external Schottky diode with a low-Rds(on) MOSFET to reduce conduction losses and improve efficiency at light loads. The LM5164-Q1 belongs to the converter (DC-DC switching regulator) -> power management IC -> semiconductor hierarchy.
Key differentiating specifications include 10 uA typical quiescent current (ultra-low IQ for always-on applications), 50 ns minimum controllable on-time enabling large step-down ratios, peak-current-mode control, and a wide 75 kHz to 1 MHz adjustable switching-frequency range. The device includes internal loop compensation, integrated 100-V boot FET, spread-spectrum option for EMI mitigation, and automotive AEC-Q100 Grade 1 qualification.
Architecturally, the LM5164-Q1 employs constant on-time (COT) variation with adaptive frequency control and internal compensation, simplifying external component selection and removing the need for an external compensation network. The high-side and low-side N-channel MOSFETs are integrated, and a precision enable/UVLO threshold plus power-good flag support sequencing in multi-rail systems.
Typical applications include 48-V telecom point-of-load regulation, automotive ECU and body-electronics power, industrial 24-V/36-V/48-V sensor and actuator supplies, battery management system auxiliary rails, and HVAC motor-driver low-voltage rails. The wide VIN range eliminates the need for external surge suppression components typically required for 24-V and 48-V industrial buses.
When designing, ensure the boot capacitor and input/output capacitors are placed close to the IC pins, and use a 1.27mm-pitch PCB layout to maintain clearance for 100-V transients. The device requires only an inductor, input/output capacitors, and feedback resistors for a complete solution.
This page synthesizes distributor pricing, AEC-Q100 alternative listings, and practical design notes not found in the manufacturer datasheet alone, providing drop-in cross-references for both automotive and non-automotive variants of the same die.
Drop-in alternatives for LM5164QDDATQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM5164QDDATQ1 (same form factor and footprint) — differing in Package, Maximum Output Current, Topology, Output Voltage Range, Pin Pitch.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM5164DDAT
✅ Drop-In📋 Reference alternative (not in catalog)
LM5164QDDARQ1
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →LM5164DDAR
✅ Drop-In✓ In Stock
$1.47 / Unit
View Datasheet →LM5163QDDARQ1
✅ Drop-In✓ In Stock
$1.75 / Unit
View Datasheet →LM5018QDDARQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LM5164QDDATQ1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) |
| Input Voltage Range | 6 V to 100 V |
| Output Voltage Range | 1.2 V to 90 V (adjustable) |
| Maximum Output Current | 1 A |
| Quiescent Current (typ) | 10 uA |
| Minimum Controllable On-Time | 50 ns |
| Switching Frequency Range | 75 kHz to 1 MHz (adjustable) |
| Control Mode | Constant On-Time (COT) with adaptive frequency |
| Integrated Switch FETs | Yes (high-side + low-side N-channel) |
| Package | 8-Pin SO PowerPAD (DDA) - 3.90 mm body width |
| Pin Pitch | 1.27 mm |
| Operating Temperature Range | -40 C to +125 C (AEC-Q100 Grade 1) |
| Automotive Qualification | AEC-Q100 Grade 1 |
| Internal Loop Compensation | Yes |
| Power Good Output | Yes |
| Enable / UVLO | Yes (precision threshold) |
| Spread Spectrum EMI | Optional (per datasheet) |
| Mounting Type | Surface Mount |
| MSL Level | 2 |
| RoHS Status | Compliant |
LM5164QDDATQ1 Pin Configuration
| Pin 1 | BST — Bootstrap capacitor connection for high-side gate drive |
| Pin 2 | VIN — Input supply voltage (6 V to 100 V) |
| Pin 3 | EN/UVLO — Enable input with precision UVLO threshold |
| Pin 4 | GND — Ground return |
| Pin 5 | PGOOD — Power-good output flag (open-drain) |
| Pin 6 | FB — Voltage feedback (to external resistor divider) |
| Pin 7 | RT/SS — Switching frequency setting resistor / soft-start |
| Pin 8 | SW — Switch node (to external inductor) |
Typical Applications
LM5164QDDATQ1 is suitable for 6 applications: 48V Telecom Point-of-Load Regulation, Automotive ECU and Body Electronics Power, Industrial 24V/36V/48V Sensor and Actuator Supplies, Battery Management System Auxiliary Rails, HVAC Motor Driver Low-Voltage Rails, Solar Micro-Inverter Auxiliary Power.
48V Telecom Point-of-Load Regulation
The LM5164QDDATQ1 is engineered for direct step-down from a 48-V nominal telecom bus to lower-voltage logic rails. Its 6-V to 100-V input range tolerates telecom battery voltage swings (36-V to 75-V) without external surge suppression. With 10 uA quiescent current and integrated synchronous FETs, it achieves >90% efficiency at 1-A load while keeping standby losses low. Place the IC near the 48-V input with input/output ceramic capacitors and a single inductor; the wide 1.27mm pitch of the SO PowerPAD-8 package maintains adequate clearance for 100-V transients, eliminating the need for additional surge components.
Recommended
Automotive ECU and Body Electronics Power
The LM5164QDDATQ1 is AEC-Q100 Grade 1 qualified and operates from -40 C to +125 C, making it well-suited for automotive ECU rails powered directly from the 12-V/24-V battery bus. Its 100-V abs-max rating survives 24-V automotive load-dump transients per ISO 7637-2. The integrated high-side and low-side FETs minimize PCB area for space-constrained body-control modules. Use the precision EN/UVLO pin for battery-undervoltage lockout, and leverage the PGOOD flag for sequencing with downstream MCU rails; the wide input range also supports 48-V mild-hybrid architectures.
Recommended
Industrial 24V/36V/48V Sensor and Actuator Supplies
The LM5164QDDATQ1 powers industrial sensors and actuators from 24-V/36-V/48-V factory-bus rails with high efficiency. Its 100-V input range tolerates inductive load transients common in motor and solenoid-driven environments, eliminating external TVS suppression components. The 50 ns minimum on-time enables large step-down ratios such as 48-V to 3.3-V in a single stage, reducing system cost and complexity. Combined with internal loop compensation, the design needs only an inductor, capacitors, and feedback resistors - a complete solution in less than 100 mm2 of PCB area for PLC and distributed I/O modules.
Recommended
Battery Management System Auxiliary Rails
The LM5164QDDATQ1 generates auxiliary rails for battery management systems (BMS) from a high-voltage battery stack. With its 10 uA quiescent current and 100-V input rating, it can run continuously from a 48-V to 80-V battery stack to power housekeeping MCU and communication rails. The wide output adjustability (1.2-V to 90-V) supports both low-voltage logic and higher intermediate rails. Integrated synchronous FETs eliminate external Schottky diodes, reducing leakage paths critical to accurate battery cell monitoring.
Recommended
HVAC Motor Driver Low-Voltage Rails
The LM5164QDDATQ1 supplies low-voltage logic and gate-driver rails for HVAC motor-control systems operating from 24-VAC-derived DC buses. Its 100-V input withstands rectified 24-VAC peaks and switching transients from motor phases. With 1-A continuous output and peak-current-mode control, it provides the fast transient response needed for variable-frequency drive housekeeping. The SO PowerPAD-8 package with thermal pad enables compact designs fitting within motor-driver housings, and the AEC-Q100 Grade 1 qualification supports HVAC equipment deployed in vehicles.
Recommended
Solar Micro-Inverter Auxiliary Power
The LM5164QDDATQ1 generates auxiliary logic rails in solar micro-inverter applications from the DC bus up to 100 V. Its ultra-low quiescent current (10 uA) minimizes standby losses during nighttime operation, improving overall energy harvest. The COT control architecture with adaptive frequency maintains high efficiency across varying load conditions characteristic of solar power conversion. With integrated synchronous FETs, the device reduces BOM cost and PCB area - critical for compact micro-inverter designs where size and efficiency directly affect payback period.
Recommended
Recommended Products Summary
Engineering reference data for LM5164QDDATQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5164DDAT | LM5164QDDARQ1 | LM5164DDAR | LM5163QDDARQ1 | LM5018QDDARQ1 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-Pin SO PowerPAD (DDA) | 8-Pin SO PowerPAD (DDA) - same | 8-Pin SO PowerPAD (DDA) - same | 8-Pin SO PowerPAD (DDA) - same | 8-Pin SO PowerPAD (DDA) - same | 8-Pin SO PowerPAD (DDA) - same |
| Input Voltage Range | 6 V to 100 V | 6 V to 100 V | 6 V to 100 V | 6 V to 100 V | 6 V to 100 V | 6 V to 100 V |
| Maximum Output Current | 1 A | 1 A | 1 A | 1 A | 2 A | 0.3 A |
| Topology | Synchronous Buck | Synchronous Buck | Synchronous Buck | Synchronous Buck | Synchronous Buck | Non-Synchronous Buck |
| Automotive Grade (AEC-Q100) | Yes (Grade 1) | No | Yes (Grade 1) | No | Yes (Grade 1) | Yes (Grade 1) |
| Operating Temperature Range | -40 C to +125 C | -40 C to +125 C (industrial) | -40 C to +125 C (AEC-Q100) | -40 C to +125 C (industrial) | -40 C to +125 C (AEC-Q100) | -40 C to +125 C (AEC-Q100) |
Key Differentiators
- Automotive AEC-Q100 Grade 1 qualified in same SO PowerPAD-8 footprint (vs LM5164DDAT)
- Pin-compatible 2-A upgrade path within the same family (vs LM5163QDDARQ1)
- Integrated synchronous FETs eliminate external Schottky (vs LM5018QDDARQ1)
Design Notes
Estimated: At VIN=48 V, VOUT=12 V, IOUT=1 A, conduction power dissipation in the integrated FETs plus switching losses is approximately 0.4 W. The 8-pin SO PowerPAD package has a thermal resistance of approximately 45 C/W with a 1-oz copper pour and properly soldered thermal pad, yielding a junction temperature rise of ~18 C above ambient at 1 A. For designs approaching the thermal limit, expand the copper pour area beneath the exposed pad to at least 1 square inch of copper on top and bottom layers stitched with thermal vias.
Place the input capacitor (>=1 uF X7R ceramic) as close as possible to the VIN and GND pins to minimize switching-node ringing and EMI. Use wide, short PCB traces for the SW node and inductor to reduce parasitic inductance and radiated EMI. Maintain at least 1.27 mm creepage between the high-voltage pins (VIN, SW, BST) and any low-voltage signal traces to meet 100-V transient clearance requirements.
Common pitfalls: (1) Failing to populate the BST bootstrap capacitor (>=0.1 uF X7R from BST to SW) prevents high-side drive and the part will not start. (2) Exceeding the 100-V abs-max on VIN during hot-plug events will permanently damage the IC - add a TVS or input clamp if transients exceed 100 V. (3) The RT/SS pin must not be left floating; either tie it to a resistor to set frequency or leave open for default 1-MHz operation. (4) Do not skip the EN/UVLO divider when using precision undervoltage lockout - the default EN threshold requires an external divider for battery-aware startup.
Compliance Information
AEC-Q100 Grade 1 qualified per TI datasheet. RoHS and REACH compliant per TI product page. Lead-free and halogen-free per TI material declaration.
