LM5146-Q1 100-V synchronous buck DC/DC controller with wide duty cycle range | TI.com

LM5146-Q1
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
100-V synchronous buck DC/DC controller with wide duty cycle range

 

Description

The LM5146-Q1 100-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5146-Q1 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance 48-V battery automotive applications, ADAS (surround view ECU) and HEV/EV systems.

Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. Measuring the voltage drop across the low-side MOSFET or with an optional current sense resistor gives cycle-by-cycle overcurrent protection. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications.

The LM5146-Q1 voltage-mode controller with line feedforward drives external high-side and low-side N-channel power switches with robust 7.5-V gate drivers suitable for standard-threshold MOSFETs. Adaptively-timed gate drivers with 2.3-A source and 3.5-A sink capability minimize body diode conduction during switching transitions, reducing switching losses and improving thermal performance when driving MOSFETs at high input voltage and high frequency. The LM5146-Q1 can be powered from the output of the switching regulator or another available source, further improving efficiency.

A 180° out-of-phase clock output relative to the internal oscillator at SYNCOUT works well for cascaded or multi-channel power supplies to reduce input capacitor ripple current and EMI filter size. Additional features of the LM5146-Q1 include a configurable soft start, an open-drain power-good monitor for fault reporting and output monitoring, monotonic start-up into prebiased loads, integrated VCC bias supply regulator and bootstrap diode, external power supply tracking, precision enable input with hysteresis for adjustable line undervoltage lockout (UVLO), hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM5146-Q1 controller is offered in a 4.5-mm × 3.5-mm thermally enhanced, 20-pin VQFN package with additional spacing for high-voltage pins and wettable flanks for optical inspection of solder joint fillets.

Features

  • AEC-Q100 Qualified for Automotive Applications:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Temperature Range
  • Versatile Synchronous Buck DC/DC Controller
    • Wide Input Voltage Range of 5.5 V to 100 V
    • Adjustable Output Voltage From 0.8 V to 60 V
    • Voltage-mode Control With Line Feedforward
  • Meets CISPR 25 EMI Standard
  • Lossless RDS(on) or Shunt Current Sensing
  • Switching Frequency From 100 kHz to 1 MHz
    • SYNC In and SYNC Out Capability
  • 40-ns Minimum On-Time for High VIN / VOUT Ratio
  • 140-ns Minimum Off-Time for Low Dropout
  • 0.8-V Reference With ±1% Feedback Accuracy
  • 7.5-V Gate Drivers for Standard VTH MOSFETs
    • 14-ns Adaptive Dead-Time Control
    • 2.3-A Source and 3.5-A Sink Capability
    • Low-Side Soft Start for Prebiased Start-Up
  • Adjustable Soft Start or Optional Voltage Tracking
  • Precision Enable Input and Open-Drain Power-Good Indicator for Sequencing and Control
  • Inherent Protection Features for Robust Design
    • Hiccup-Mode Overcurrent Protection
    • Input UVLO With Hysteresis
    • VCC and Gate-Drive UVLO Protection
    • Thermal Shutdown Protection With Hysteresis
  • 20-Pin VQFN Package With Wettable Flanks
  • Create a Custom Design Using the LM5146-Q1 With WEBENCH® Power Designer

All trademarks are the property of their respective owners.

New!
WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM5146-Q1

  Min   Max Range
Vin  V 5.5 to 100.0V
Vout  V 0.8 to 60V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C

Parametrics

Compare all products in Buck controllers (external switch) Email Download to Excel
Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Number of Phases Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Control mode
LM5146-Q1 Order now 5.5     100     0.8     60       1     1     100     1000     1.75     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable    
99     -40 to 150     Automotive     VQFN | 20     Controller     Voltage Mode    
LM5117-Q1 Order now 5.5     65     0.8     62     20     1     1     50     750     4.8     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
Tracking
UVLO Adjustable    
98     -40 to 125     Automotive     HTSSOP | 20
WQFN | 24    
Controller     Current Mode    
LM5141-Q1 Order now 3.8     65     1.5     15     20     1     1     350     2600     0.035     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
Tracking
UVLO Fixed    
78     -40 to 150     Automotive     VQFN | 24     Controller     Current Mode    
TPS40170-Q1 Order now 4.5     60     0.6     57     20     1     1     100     600     4.5     Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable    
95     -40 to 125     Automotive     VQFN | 20     Controller     Voltage Mode