The LM5164DDAR from Texas Instruments is a wide-input synchronous buck DC/DC converter operating from 6V to 100V and delivering up to 1A of output current. Integrated high-side and low-side power MOSFETs eliminate the need for an external Schottky freewheel diode, helping reduce component count and overall solution size.
The LM5164 uses a constant on-time (COT) control architecture for fast line and load transient response. Minimum controllable on-time and off-time are approximately 50ns, enabling high step-down conversion ratios such as direct conversion from a nominal 48V bus to low-voltage rails. Switching frequency is externally programmable up to 1MHz.
The device is optimized for high light-load efficiency with diode-emulation operation. Typical no-load input quiescent current is only 10.5μA, while shutdown current is approximately 3μA. A 1.2V internal feedback reference allows the output voltage to be programmed with an external resistor divider, and no external loop-compensation components are required.
Integrated protection and monitoring functions include a 3ms internal soft start, peak and valley current limiting, input undervoltage lockout, thermal shutdown with automatic recovery, and an open-drain PGOOD indicator. The LM5164 is suitable for industrial power supplies, high-cell-count battery packs, motor drives, e-bikes, e-scooters, drones and communications equipment.
The LM5164DDAR is supplied in a thermally enhanced 8-pin HSOIC / SO PowerPAD (DDA) package with a 1.27mm pin pitch. It operates over a -40°C to +150°C junction-temperature range, and the DDAR option is supplied in 2500-piece large tape-and-reel packaging. TI currently lists the LM5164 as ACTIVE.
Key Specifications:
- Brand: Texas Instruments / TI
- Part Number: LM5164DDAR
- Product Type: Synchronous Buck DC/DC Converter
- Topology: Buck / Step-Down
- Input Voltage Range: 6V to 100V
- Maximum Output Current: 1A
- Output Voltage: Adjustable
- Internal Feedback Reference: 1.2V
- Control Architecture: Constant On-Time (COT)
- Maximum Switching Frequency: 1MHz
- Minimum On-Time: 50ns
- Minimum Off-Time: 50ns
- Integrated High-Side MOSFET: Yes
- Integrated Low-Side MOSFET: Yes
- High-Side RDS(on): Approx. 0.725Ω
- Low-Side RDS(on): Approx. 0.33–0.34Ω Typical
- No-Load Input IQ: 10.5μA Typical
- Shutdown Current: 3μA Typical
- Internal Soft Start: 3ms
- Diode Emulation: Supported
- Peak Current Limit: Supported
- Valley Current Limit: Supported
- Input UVLO: Supported
- Thermal Shutdown: Supported
- Power Good: Open Drain
- Operating Junction Temperature: -40°C to +150°C
- Package: HSOIC-8 / SO PowerPAD / DDA
- Pin Count: 8
- Pin Pitch: 1.27mm
- Mounting Type: SMD / SMT
- Packaging: Large Tape & Reel
- Standard Pack Quantity: 2500 pcs
- Product Status: ACTIVE
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