LM5143-Q1 3.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller | TI.com

LM5143-Q1
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3.5-V to 65-V low Iq, dual, 2-phase synchronous buck DC-DC controller

 

Description

The LM5143-Q1 is a 65-V synchronous buck DC/DC controller for high-current single or dual outputs. The device uses an interleaved, stackable, peak current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for higher output current. A high-side switch minimum on-time of 65 ns gives large step-down ratios, enabling the direct conversion from 12-V, 24-V or 48-V automotive inputs to low-voltage rails for reduced system complexity and solution cost. The LM5143-Q1 continues to operate during input voltage dips as low as 3.5 V, at nearly 100% duty cycle if needed.

Current is sensed using the inductor DCR for highest efficiency or an optional shunt resistor for high accuracy. The 15-µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered systems. Power the LM5143-Q1 from the output of the switching regulator or another available source for even lower input quiescent current and power loss.

Several features are included to simplify compliance with CISPR 25 and automotive EMI requirements. Adaptively timed, high-current MOSFET gate drivers with adjustable slew rate control minimize body diode conduction during switching transitions, reducing switching losses and improving thermal and EMI performance at high input voltage and high switching frequency. To reduce input capacitor ripple current and EMI filter size, 180° interleaved operation is provided for two outputs. A 90° out-of-phase clock output works well for cascaded, multi-channel, or multi-phase power stages. Resistor-adjustable switching frequency as high as 2.2 MHz can be synchronized to an external clock source up to 2.5 MHz to eliminate beat frequencies in noise-sensitive applications. Optional triangular spread spectrum modulation further improves the EMI signature.

Additional features of the LM5143-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, configurable soft-start functions, open-drain Power-Good flags for fault reporting and output monitoring, independent enable inputs, monotonic start-up into prebiased loads, integrated VCC bias supply regulator, programmable hiccup-mode overload protection, and thermal shutdown protection with automatic recovery.

The LM5143-Q1 controller comes in a 6-mm × 6-mm thermally-enhanced, 40-pin VQFNP package with wettable flank pins to facilitate optical inspection during manufacturing.

Features

  • AEC-Q100 qualified for automotive applications:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Versatile synchronous buck DC/DC controller
    • Wide input voltage range of 3.5 V to 65 V
    • 1% accurate, fixed 3.3-V, 5-V or adjustable outputs from 0.6 V to 55 V
    • 150°C maximum junction temperature
    • Shutdown mode current: 4 µA typical
    • No-load standby current: 15 µA typical
  • Two interleaved synchronous buck channels
    • Dual-channel or single-output multiphase
    • 65-ns tON(min) for high VIN/VOUT ratio
    • 60-ns tOFF(min) for low dropout
  • Switching frequency from 100 kHz to 2.2 MHz
    • SYNC in and SYNC out capability
  • Inherent protection features for robust design
    • Hiccup-mode overcurrent protection
    • Independent ENABLE and PGOOD functions
    • VCC, VDDA, and gate-drive UVLO protection
    • Thermal shutdown protection with hysteresis
  • Optimized for ultra-low EMI requirements
    • Slew-rate controlled adaptive gate drivers
    • Spread spectrum reduces peak emissions
    • Meets CISPR 25 Class 5 standard
  • VQFNP-40 package with wettable flank pins
  • Create a custom design using the LM5143-Q1 with WEBENCH® Power Designer

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WEBENCH ® Designer LM5143-Q1

  Min   Max Range
Vin -  V 3.5 to 65V
Product Option
Vout  V 0.6 to 55V
Iout  A ≤ 40A
Vout 2  V 0.6 to 55V
Iout 2  A ≤ 40A
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 (#) 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
LM5143-Q1 Order now 3.5     65     0.6     55     100     2     2     100     2200     0.015     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Multiple Outputs
Phase Interleaving
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
Tracking
UVLO Fixed    
99     -40 to 150     Automotive     VQFNP | 40     Controller     Current Mode    
LM5140-Q1 Order now 3.8     65     1.5     15     40     2     2     350     2600     0.035     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Multiple Outputs
Phase Interleaving
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
Tracking
UVLO Fixed    
96     -40 to 150     Automotive     VQFNP | 40     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