LM5165 3V-65V, 150mA Synchronous Buck Converter With Ultra-Low IQ | TI.com

LM5165 (ACTIVE)

3V-65V, 150mA Synchronous Buck Converter With Ultra-Low IQ

 

Description

The LM5165 device 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 150-mA of output current can be delivered at fixed output voltages of 3.3 V or 5 V or at 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 output 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 LM5165 buck converter is available in a 10-pin, 3-mm × 3-mm, thermally-enhanced VSON-10 package with 0.5-mm pin pitch.

Features

  • Wide Input Voltage Range of 3 V to 65 V
  • 10.5-µA No-Load Quiescent Current
  • –40°C to 150°C Junction Temperature Range
  • Fixed (3.3-V, 5-V) or Adjustable Output Voltages
  • Meets EN55022 / CISPR 22 EMI Standards
  • Integrated 2-Ω PMOS Buck Switch
    • Supports 100% Duty Cycle for Low Dropout
  • Integrated 1-Ω NMOS Synchronous Rectifier
    • Eliminates External Rectifier Diode
  • Programmable Current Limit Setpoint (4 Levels)
  • Selectable PFM or COT Mode Operation
  • 1.223-V ±1% Internal Voltage Reference
  • 900-µs Internal or Programmable Soft Start
  • Active Slew Rate Control for Low EMI
  • Diode Emulation Mode and Pulse Skipping for Ultra-High Light-Load Efficiency Performance
  • Monotonic Start-Up into Prebiased Output
  • No Loop Compensation or Bootstrap Components
  • Precision Enable and Input UVLO With Hysteresis
  • Pin-to-pin Compatible With the LM5166
  • Thermal Shutdown Protection With Hysteresis
  • 10-Pin, 3-mm × 3-mm VSON Package
  • Create a Custom Regulator Design Using WEBENCH® Power Designer

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WEBENCH ® Designer LM5165

Part Number
  Min   Max Range
Vin -  V 3 to 65V
Vout  V 1.223 to 60V
Iout  A 0 to 0.15A
Ambient Temp   °C -40 to 125 °C

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
LM5165 Order now 3     65     1.23     65     0.15     1     50     600     0.01     Adjustable Current Limit
Enable
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Constant on-time (COT)     100     -40 to 150     Catalog     VSON | 10     Converter     10VSON: 9 mm2: 3 x 3 (VSON | 10)