3V-65V Input, 500mA Synchronous Buck Converter With Ultra-Low Iq
Product details
Parameters
Package | Pins | Size
Features
- Wide Input Voltage Range of 3 V to 65 V
- 9.7-µA No-Load Quiescent Current
- –40°C to 150°C Junction Temperature Range
- Fixed (3.3-V, 5-V) or Adjustable VOUT Options
- Meets EN55022 / CISPR 22 EMI Standards
- Integrated 1-Ω PFET Buck Switch
- Supports 100% Duty Cycle for Low Dropout
- Integrated 0.5-Ω NFET Synchronous Rectifier
- Eliminates External Schottky Diode
- Programmable Peak Current Limit Supports:
- 500-mA, 300-mA, or 200-mA Loads
- Selectable PFM or COT Mode Operation
- 1.223-V ±1.2% Internal Voltage Reference
- Switching Frequency up to 600 kHz
- 900-µs Internal or Externally-Adjustable Soft Start
- Diode Emulation and Pulse Skipping for Ultra-High Light-Load Efficiency
- No Loop Compensation or Bootstrap Components
- Precision Enable and Input UVLO With Hysteresis
- Open-Drain Power Good Indicator
- Thermal Shutdown Protection With Hysteresis
- Pin-to-Pin Compatible With the LM5165
- 10-Pin, 3-mm × 3-mm VSON Package
- Create a Custom Regulator Design Using WEBENCH® Power Designer
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Description
The LM5166 is a compact, easy-to-use, 3-V to 65-V, ultra-low IQ synchronous buck converter with high efficiency over wide input voltage and load current ranges. With integrated high-side and low-side power MOSFETs, up to 500 mA of output current can be delivered at fixed output voltages of 3.3 V or 5 V, or an adjustable output. The converter is designed to simplify implementation while providing options to optimize the performance for the target application. Pulse frequency modulation (PFM) mode is selected for optimal light-load efficiency or constant on-time (COT) control for nearly constant operating frequency. Both control schemes do not require loop compensation while providing excellent line and load transient response and short PWM on-time for large step-down conversion ratios.
The high-side P-channel MOSFET can operate at 100% duty cycle for lowest dropout voltage and does not require a bootstrap capacitor for gate drive. Also, the current limit setpoint is adjustable to optimize inductor selection for a particular load current requirement. Selectable and adjustable start-up timing options include minimum delay (no soft start), internally fixed (900 µs), and externally programmable soft start using a capacitor. An open-drain PGOOD indicator can be used for sequencing, fault reporting, and output voltage monitoring. The LM5166 is available in a 10-pin VSON package with 0.5-mm pin pitch.
Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- 4.5V to 65V input voltage range
- 3.3V target output voltage
- Ultra-high power conversion efficiency: >85% at an output of 3.3 V and above 10 mA load (input voltage 12 V)
- COT or PFM control architecture
- No-load supply current as low as 12µA
Description
Features
- 6V to 65V input voltage range
- 5V target output voltage
- Ultra-high power conversion efficiency: >90% at an output of 5 V and above 1 mA load (input voltage 12 V)
- COT or PFM control architecture
- No-load supply current as low as 12µA
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Features
- Determine filter inductance and input and output filter capacitances for a given operating mode (PFM or COT)
- Optimize the design using efficiency and solution size as key performance metrics
- Select components for soft-start, input UVLO, output voltage setpoint, current limit and switching frequency
- (...)
Reference designs
Design files
-
download TIDA-01386 Assembly Drawing.pdf (135KB) -
download TIDA-01386 PCB.pdf (842KB) -
download TIDA-01386 CAD Files.zip (922KB) -
download TIDA-01386 Gerber.zip (443KB) -
download TIDA-01386 BOM (Rev. A).pdf (57KB)
Design files
-
download TIDA-010055 BOM Files.zip (310KB) -
download TIDA-010055 Assembly Files.zip (827KB) -
download TIDA-010055 Layer Plots.zip (2674KB) -
download TIDA-010055 CAD Files.zip (9038KB) -
download TIDA-010055 Gerber.zip (1157KB)
Design files
-
download TIDA-010049 BOM.pdf (49KB) -
download TIDA-010049 Assembly Drawing.pdf (510KB) -
download TIDA-010049 PCB.pdf (2566KB) -
download TIDA-010049 CAD Files.zip (2441KB) -
download TIDA-010049 Gerber.zip (589KB)
Design files
Design files
-
download TIDA-01437 BOM.pdf (106KB) -
download TIDA-01437 Assembly Drawing.pdf (413KB) -
download TIDA-01437 PCB.pdf (1721KB) -
download TIDA-01437 CAD Files.zip (2143KB) -
download TIDA-01437 Gerber.zip (602KB)
Design files
-
download TIDA-01395 BOM.pdf (76KB) -
download TIDA-01395 Assembly Drawing.pdf (372KB) -
download TIDA-01395 PCB.pdf (2114KB) -
download TIDA-01395 CAD Files.zip (978KB) -
download TIDA-01395 Gerber.zip (781KB)
Design files
-
download TIPD215 BOM.pdf (61KB) -
download TIPD215 Assembly Drawing.pdf (105KB) -
download TIPD215 PCB.pdf (2600KB) -
download TIPD215 CAD Files.zip (852KB) -
download TIPD215 Gerber.zip (389KB)
Design files
-
download TIDA-01358 BOM.pdf (81KB) -
download TIDA-01358 Assembly Drawing.pdf (311KB) -
download TIDA-01358 PCB.pdf (1283KB) -
download TIDA-01358 CAD Files.zip (895KB) -
download TIDA-01358 Gerber.zip (502KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
VSON (DRC) | 10 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
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