LM5164DDAR - 100V 1A Sync Buck Converter | Texas Instruments
MPN: LM5164DDAR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.2 | $22.00 |
| 100 | $1.85 | $185.00 |
| 500 | $1.65 | $825.00 |
| 1,000 | $1.47 | $1,470.00 |
LM5164DDAR Overview
A synchronous buck converter is a type of DC-DC step-down regulator in the power management IC hierarchy that uses two active switches instead of a diode to achieve higher efficiency, especially at low output voltages. The LM5164 integrates both high-side and low-side MOSFETs, simplifying design and reducing external component count.
Key features include an ultra-low quiescent current that extends battery life in always-on systems, and a wide input range that eliminates external surge suppression components. An open-drain PGOOD indicator supports power sequencing, fault reporting, and output voltage monitoring. The 1 MHz switching frequency allows small external inductors and capacitors, and the device supports 100% duty cycle for low dropout operation.
The LM5164 uses peak current-mode control with internal compensation, providing fast transient response and stable operation over a wide range of output capacitors. Integrated low-RDS(on) MOSFETs minimize conduction losses. Cycle-by-cycle current limiting, thermal shutdown, and hiccup-mode short-circuit protection ensure robust operation in harsh environments.
Typical applications include industrial 24-V and 48-V bus power supplies, 12-V automotive body electronics, motor drives, battery management systems, and always-on telematics. The ultra-low IQ makes it ideal for remote monitoring systems that spend most of their life in standby.
Design tip: provide a solid ground plane and adequate copper area under the PowerPAD for thermal dissipation, and maintain sufficient creepage distance between high-voltage and low-voltage traces given the 1.27-mm pin pitch.
Drop-in alternatives for LM5164DDAR — 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 LM5164DDAR (same form factor and footprint) — differing in Package, Pin Pitch, Topology, Automotive Qualification, Output Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM5164QDDARQ1
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →LM5163DDAR
✅ Drop-In📋 Reference alternative (not in catalog)
LM5165DDAR
✅ Drop-In📋 Reference alternative (not in catalog)
TPS54360QDDARQ1
⚡ Same Package ⚠️ Specs Unverified✓ In Stock
$2.45 / Unit
View Datasheet →LM2596SX-ADJ/NOPB-Q1
⚡ Same Package ⚠️ Specs Unverified✓ In Stock
$1.02 / Unit
View Datasheet →LM5164DDAR Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck (step-down) |
| Input Voltage Range | 6 V to 100 V |
| Maximum Output Current | 1 A |
| Output Voltage Range | Adjustable, down to 1.2 V |
| Number of Outputs | 1 |
| Switching Frequency | 1 MHz |
| Control Architecture | Peak current-mode, internal compensation |
| Duty Cycle | 100% (low dropout operation) |
| PGOOD Indicator | Open-drain PGOOD |
| Protection Features | Cycle-by-cycle current limit, thermal shutdown, hiccup mode |
| Operating Temperature | -40C to +150C (TJ) |
| Package | 8-PowerSOIC (HSOIC-8, DDAR), 0.154 in / 3.90 mm width |
| Pin Pitch | 1.27 mm (high-voltage spacing) |
| Mounting Type | Surface Mount |
LM5164DDAR Pin Configuration
| Pin 1 | VIN — Input supply voltage, 6 V to 100 V |
| Pin 2 | EN — Enable input with internal regulation |
| Pin 3 | AGRT / AGND — Analog ground reference |
| Pin 4 | FB — Feedback input for output voltage adjustment |
| Pin 5 | PGOOD — Open-drain power good indicator |
| Pin 6 | BOOT — Bootstrap capacitor for high-side driver |
| Pin 7 | SW — Switching node (connected to inductor) |
| Pin 8 | PGND — Power ground |
| Pin 9 | PowerPAD — Thermal pad - solder to ground plane for heat dissipation |
Typical Applications
LM5164DDAR is suitable for 6 applications: 48-V Industrial Bus Power Supply, Automotive 12-V Body Electronics, Battery Management Systems, Motor Drives and Actuators, Telematics and Remote Monitoring, Test and Measurement Instrumentation.
48-V Industrial Bus Power Supply
The LM5164DDAR's 6-V to 100-V input range directly covers 48-V industrial buses with wide transient headroom, eliminating external TVS or pre-regulation stages. As a synchronous buck with integrated MOSFETs, it converts 48 V down to 5 V or 3.3 V logic rails at up to 1 A with 1 MHz switching, keeping the inductor small. The ultra-low IQ benefits always-on factory monitoring nodes that idle most of the time.
Recommended
Automotive 12-V Body Electronics
In automotive body ECUs (lighting, door modules, telematics), the LM5164 handles 12-V rail load-dump and cold-crank transients via its 100-V input rating and 100% duty cycle support. The open-drain PGOOD output enables fault reporting to the MCU, and hiccup-mode protection survives persistent shorts. The AEC-Q100 qualified LM5164QDDARQ1 covers designs requiring automotive qualification.
Recommended
Battery Management Systems
The LM5164 provides a regulated low-voltage bias rail from high-voltage battery stacks (24-V, 48-V packs) with ultra-low standby current that preserves pack state of charge. Its wide input range suits battery chemistries with large voltage swings, while cycle-by-cycle current limiting and thermal shutdown protect against fault conditions during charge and discharge events in BMS slave boards.
Recommended
Motor Drives and Actuators
Motor drive controllers need a robust auxiliary supply derived from the high-voltage DC bus. The LM5164's rugged 100-V rating, hiccup-mode short-circuit protection, and -40C to +150C junction rating suit noisy motor drive environments. Its 1 MHz operation keeps the bias supply magnetics compact, and PGOOD sequencing ensures the gate-driver supply is valid before the MCU enables PWM outputs.
Recommended
Telematics and Remote Monitoring
Always-on telematics and IoT gateways spend most of their life in sleep, making ultra-low quiescent current decisive for battery life. The LM5164DDAR's low IQ plus 100-V transient tolerance on vehicle or solar inputs keeps systems alive through surges while sipping microamps in standby. The PGOOD pin allows the host MCU to verify rail integrity before waking peripheral loads.
Recommended
Test and Measurement Instrumentation
Bench and field instruments often have wide-range AC-adapter or battery inputs; the LM5164 generates clean intermediate rails from 6-V to 100-V sources with 1 MHz switching that is easy to filter. Internal compensation simplifies design across diverse output capacitor choices, and the adjustable output down to 1.2 V supports modern low-voltage analog and digital subsystems.
Recommended
Recommended Products Summary
Engineering reference data for LM5164DDAR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM5164QDDARQ1 | LM5163DDAR | LM5165DDAR |
|---|---|---|---|---|
| Package | HSOIC-8 (DDA) PowerPAD | HSOIC-8 PowerPAD - same | HSOIC-8 PowerPAD - same | HSOIC-8 PowerPAD - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Automotive Grade | No | Yes (AEC-Q100) | No | No (standard) |
Key Differentiators
- 100-V input rating without external surge suppression (vs TPS54360QDDARQ1)
- Ultra-low quiescent current for always-on systems (vs LM2596SX-ADJ/NOPB-Q1)
- Pin-compatible 1.5 A upgrade path (vs LM5165DDAR)
Design Notes
The LM5164DDAR uses a thermally enhanced 8-pin SO PowerPAD package. The PowerPAD must be soldered to a PCB ground pour with multiple thermal vias; an unsoldered pad significantly degrades thermal performance and may cause thermal shutdown at high VIN-VOUT differentials near the full 1 A load. Keep junction temperature below +150C per the TI datasheet.
Keep the loop from VIN capacitor, integrated MOSFETs, SW pin, and PGND as small as possible to minimize EMI. With a 1 MHz switching frequency, use short, wide traces for the SW node and place the bootstrap capacitor close to BOOT and SW pins. The 1.27-mm pin pitch aids high-voltage spacing, but still maintain creepage between 100-V and low-voltage traces.
Do not exceed the 100-V absolute maximum input, including transient spikes on inductive 48-V or automotive rails. Use the FB resistor divider with 1% tolerance resistors to set output accuracy, and reference the TI datasheet typical application section (lm5164.pdf) for recommended inductor and output capacitor ranges - internal compensation assumes output capacitance within the specified range.
Compliance Information
RoHS compliance and lead-free status per standard TI production flow; the AEC-Q100 qualified variant is LM5164QDDARQ1. REACH/halogen status not stated in provided data.
