LM5163QDDARQ1 - 100V 0.5A Sync Buck DC/DC Converter | TI
MPN: LM5163QDDARQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.35 | $235.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.75 | $1,750.00 |
LM5163QDDARQ1 Overview
Background: A buck (step-down) DC/DC converter is a switching voltage regulator which uses an inductor and capacitive output filter to convert a higher DC input voltage into a lower, regulated DC output. The synchronous topology replaces the traditional rectifier diode with a low-side MOSFET, dramatically improving efficiency at light loads. The LM5163-Q1 belongs to the category hierarchy: synchronous buck converter -> step-down DC/DC regulator -> switching voltage regulator -> power management IC -> semiconductor.
Key features include an ultra-low IQ of 10.5 µA typical (no-load), a minimum controllable on-time of 50 ns that enables direct step-down from a 48V nominal rail to low-voltage point-of-load rails, and a switching frequency range of 75 kHz to 1 MHz programmable via RT pin. The device also integrates open-drain PGOOD indicator for output voltage monitoring and sequencing, fixed 2-ms or externally-programmable soft-start, and cycle-by-cycle overcurrent protection. The 8-pin SO PowerPAD package with 1.27 mm pin pitch provides adequate creepage for high-voltage applications.
Architecturally, the LM5163-Q1 uses peak current-mode control with internal compensation, eliminating the need for an external compensation network. The wide VIN range minimizes external surge suppression components, simplifying 48V automotive and industrial designs. According to TI's product page, the part is qualified to AEC-Q100 grade 1 and is available in the 8-pin SO PowerPAD package.
Typical applications include automotive 48V mild-hybrid systems, industrial 24V/36V/48V sensor and actuator rails, body electronics and lighting, battery-powered equipment with high-voltage transient protection, and isolated point-of-load regulation. The wide VIN tolerance allows direct connection to unregulated rectified AC or high-voltage DC bus without extensive protection circuitry.
When designing, drop the inductor selection on the output short-circuit protection rating of the upstream supply - the LM5163-Q1 can withstand 100V transients. Use a 1% tolerance resistor divider at the FB pin to maintain output voltage accuracy and place the BOOT capacitor as close as possible to the BOOT and SW pins.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for LM5163QDDARQ1 — 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 LM5163QDDARQ1 (same form factor and footprint) — differing in Package, Maximum Output Current, Topology, Control Mode, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM5163DDAR
✅ Drop-In📋 Reference alternative (not in catalog)
LM5163HQDDARQ1
✅ Drop-In📋 Reference alternative (not in catalog)
LM5163QDDARQ1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (Step-Down) DC/DC Converter |
| Input Voltage Range | 6 V to 100 V |
| Output Voltage Range | 1.2 V to 90 V (adjustable) |
| Maximum Output Current | 0.5 A |
| Quiescent Current (typical) | 10.5 µA (no-load) |
| Switching Frequency Range | 75 kHz to 1 MHz |
| Minimum Controllable On-Time | 50 ns |
| MOSFET Configuration | Internal high-side and low-side (synchronous) |
| Control Mode | Peak Current-Mode Control with internal compensation |
| Feedback Reference Voltage | 1.2 V (typical) |
| Soft-Start | Internal 2 ms or external programmable |
| Power Good (PGOOD) Output | Open-drain |
| Package | 8-pin SO PowerPAD (DDA), 1.27 mm pitch |
| Operating Temperature Range | -40 °C to +125 °C |
| Automotive Qualification | AEC-Q100 Grade 1 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
LM5163QDDARQ1 Pin Configuration
| Pin 1 | VIN — Input supply voltage (6V to 100V) |
| Pin 2 | EN/UVLO — Enable and undervoltage lockout |
| Pin 3 | RT — Resistor-programmable switching frequency (75 kHz to 1 MHz) |
| Pin 4 | FB — Voltage feedback (1.2V internal reference) |
| Pin 5 | COMP/PGOOD — Compensation network / open-drain power good output |
| Pin 6 | BOOT — Bootstrap capacitor for high-side gate driver |
| Pin 7 | SW — Switch node (connection to power inductor) |
| Pin 8 | GND — Ground (and thermal pad on package bottom) |
Typical Applications
LM5163QDDARQ1 is suitable for 6 applications: Automotive 48V Mild-Hybrid Systems, Industrial 24V/36V/48V Sensor & Actuator Rails, Body Electronics and Lighting, Battery-Powered High-Voltage Equipment, Isolated Point-of-Load Regulation (Secondary Side), Solar Micro-Inverter Auxiliary Supplies.
Automotive 48V Mild-Hybrid Systems
The LM5163QDDARQ1 is purpose-built for 48V mild-hybrid automotive power architectures, where it steps down directly from a 48V nominal rail (with 100V transient tolerance) to lower point-of-load voltages like 12V, 5V, or 3.3V. Its 50 ns minimum controllable on-time enables high step-down ratios in a single stage without intermediate rails, reducing system complexity. The AEC-Q100 Grade 1 qualification ensures reliability across the -40°C to +125°C automotive temperature range. The integrated synchronous MOSFETs eliminate the external rectifier diode, shrinking PCB area and improving efficiency at light loads where 48V systems spend much of their time. Place the device close to the 48V input bulk capacitor and use a 1% FB resistor divider for production accuracy. Pair with TVS protection rated above 100V for load-dump transient compliance per ISO 7637-2.
Recommended
Industrial 24V/36V/48V Sensor & Actuator Rails
In industrial automation, the LM5163QDDARQ1 generates isolated or non-isolated low-voltage rails (5V, 12V, 24V) from 24V, 36V, or 48V industrial bus voltages with tolerance for high-voltage transients on long factory cabling. Its wide 6V to 100V input range tolerates voltage sags and surges common in motor-drive environments without external surge suppression. The 10.5 µA quiescent current extends runtime in battery-backed industrial sensor nodes, while the 0.5A output current is sufficient for PLC digital outputs, sensor excitation, and small actuator drivers. The peak current-mode control with internal compensation eliminates complex external compensation networks, simplifying factory-floor designs where long-term reliability matters more than BOM optimization.
Recommended
Body Electronics and Lighting
Automotive body control modules (BCMs), interior LED drivers, and exterior lighting controllers use the LM5163QDDARQ1 to generate logic rails from the 12V battery rail with load-dump tolerance. Its synchronous topology delivers high efficiency across the full load range, critical for always-on body electronics that draw standby current when the vehicle is parked. The 75 kHz to 1 MHz programmable switching frequency allows the designer to move the switching noise out of the AM radio band (above 1.7 MHz is recommended for AM-band-sensitive designs). For LED driving, the device can power constant-current LED driver stages directly. The AEC-Q100 Grade 1 qualification makes it suitable for under-hood applications where ambient temperatures regularly exceed 100°C.
Recommended
Battery-Powered High-Voltage Equipment
Portable and battery-backed equipment operating from multi-cell battery stacks (up to 18S Li-ion at 100V) uses the LM5163QDDARQ1 to generate system voltages directly from the pack without intermediate boost stages. The ultra-low 10.5 µA quiescent current extends standby runtime, and the wide 6V to 100V range handles the full charge-discharge voltage profile of high-cell-count packs. Applications include e-bike controllers, portable medical devices, professional cordless power tools, and solar micro-inverter auxiliary supplies. The integrated PGOOD output allows sequencing with downstream point-of-load converters for FPGAs or processors in instrumentation designs.
Recommended
Isolated Point-of-Load Regulation (Secondary Side)
On the secondary side of an isolated DC/DC transformer (after the rectifier and bulk capacitor), the LM5163QDDARQ1 serves as the post-regulation stage for telecom, industrial, and renewable energy isolated power supplies. Its wide input range accommodates the variable bulk cap voltage seen on the secondary side, and the synchronous topology delivers high efficiency at low output voltages like 3.3V and 5V. Combined with a digital isolator, the design supports feedback loop closure across the isolation boundary. The high switching frequency (up to 1 MHz) minimizes the output filter size, reducing PCB area in compact isolated modules.
Recommended
Solar Micro-Inverter Auxiliary Supplies
In photovoltaic micro-inverters and string inverters, the LM5163QDDARQ1 generates auxiliary control rails (5V, 12V, 24V) from the high-voltage DC bus (typically 30V to 80V) before main inverter startup. The wide input range handles the full MPPT input voltage window of small solar systems, and the AEC-Q100 Grade 1 qualification (though automotive-targeted) provides robust operation across the wide temperature swings seen in outdoor solar installations. The integrated PGOOD signal enables safe startup sequencing of the main inverter power MOSFETs. The high switching frequency reduces output filter size for compact PCB-mounted inverters.
Recommended
Recommended Products Summary
Engineering reference data for LM5163QDDARQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5163DDAR | LM5163HQDDARQ1 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin SO PowerPAD (DDA) | 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 |
| Output Current | 0.5 A | 0.5 A | 0.5 A |
| Output Voltage Range | 1.2 V to 90 V | 1.2 V to 90 V | 1.2 V to 90 V |
| Switching Frequency Range | 75 kHz to 1 MHz | 75 kHz to 1 MHz | 75 kHz to 1 MHz |
| Quiescent Current (typ) | 10.5 µA | 10.5 µA | 10.5 µA |
| Automotive Qualification | AEC-Q100 Grade 1 | No (commercial grade) | Yes (AEC-Q100 Grade 1) |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
Key Differentiators
- Ultra-low 10.5 µA quiescent current with 100V VIN range (vs LM5163DDAR (commercial grade))
- 50 ns minimum controllable on-time enables direct 48V-to-low-V step-down (vs LM5163HQDDARQ1)
- Wide VIN range eliminates front-end surge protection (vs Lower-voltage buck converters)
Design Notes
The 8-pin SO PowerPAD (DDA) package dissipates heat through the exposed thermal pad which must be soldered to a top-layer copper pour with multiple thermal vias to inner ground planes. Estimated: at VIN=48V, VOUT=5V, and IOUT=0.5A, the conduction and switching losses total approximately 1.0W (about 86% efficiency assumed); with theta_JA in the 50-60 °C/W range (typical for SO PowerPAD on 1oz 4-layer PCB), the junction temperature rises about 50 °C above ambient. For applications near the upper operating-temperature boundary, expand the thermal pad copper area to at least 1 square inch.
Place the input ceramic capacitor (X7R, 100 nF to 1 µF) as close as possible to the VIN and GND pins to minimize high-frequency switching loop area. Place the BOOT capacitor (100 nF) between BOOT and SW pins with the shortest possible trace length. The SW node trace should be kept short and wide to minimize radiated EMI; consider a shielded inductor if the SW trace exceeds 10 mm. Keep the FB trace away from the SW node and BOOT trace to avoid noise coupling into the feedback loop. The exposed thermal pad must be connected to GND with at least 5 thermal vias for proper heat dissipation.
Do not exceed the absolute maximum VIN rating of 100V - even brief transients above this can permanently damage the device. For automotive load-dump compliance (ISO 7637-2), add a TVS diode rated appropriately ahead of the input capacitor. Use a 1% tolerance resistor divider at the FB pin to maintain output voltage accuracy; 1% resistors are recommended for production designs. Do not omit the BOOT capacitor - without it, the high-side MOSFET cannot be driven and the device will not switch. Ensure the inductor current rating is at least 30% above the maximum load current to prevent saturation at maximum VIN.
Compliance Information
AEC-Q100 Grade 1 qualified per the -Q1 suffix in the MPN. RoHS and REACH compliance per TI product page. Halogen-free status not explicitly listed in verified web data.
