LM5118-Q1 Automotive Grade 3-75V Wide Vin, Current Mode Non-Synchronous Buck-Boost Controller | TI.com

LM5118-Q1 (ACTIVE)

Automotive Grade 3-75V Wide Vin, Current Mode Non-Synchronous Buck-Boost Controller

 

Description

The LM5118-Q1 wide voltage range Buck-Boost switching regulator controller features all of the functions necessary to implement a high-performance, cost-efficient Buck-Boost regulator using a minimum of external components. The Buck-Boost topology maintains output voltage regulation when the input voltage is either less than or greater than the output voltage, making it especially suitable for automotive applications. The LM5118-Q1 operates as a buck regulator while the input voltage is sufficiently greater than the regulated output voltage and gradually transitions to the buck-boost mode as the input voltage approaches the output. This dual-mode approach maintains regulation over a wide range of input voltages with optimal conversion efficiency in the buck mode and a glitch-free output during mode transitions. This easy-to-use controller includes drivers for the high-side buck MOSFET and the low-side boost MOSFET. The regulators control method is based upon current mode control using an emulated current ramp. Emulated current mode control reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of the very small duty cycles necessary in high input voltage applications. Additional protection features include current limit, thermal shutdown and an enable input. The device is available in a power-enhanced, 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

Features

  • AEC-Q100 Qualified for Automotive Applications
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • Ultra-Wide Input Voltage Range From 3 V to 75 V
  • Emulated Peak Current Mode Control
  • Smooth Transition Between Step-Down and Step-Up Modes
  • Switching Frequency Programmable to 500 KHz
  • Oscillator Synchronization Capability
  • Internal High Voltage Bias Regulator
  • Integrated High and Low-Side Gate Drivers
  • Programmable Soft-Start Time
  • Ultra-Low Shutdown Current
  • Enable Input Wide Bandwidth Error Amplifier
  • 1.5% Feedback Reference Accuracy
  • Thermal Shutdown
  • Package: 20-Pin HTSSOP (Exposed Pad)
  • Create a Custom Design Using the LM5118-Q1 With the WEBENCH® Power Designer

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WEBENCH® Designer LM5118-Q1

  Min   Max Range
Vin  V 3.0 to 75.0V
Vout  V 1.23 to 70V
Iout  A ≤ 10A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Topology Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Duty cycle (Max) (%) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Iout (Max) (A) Operating temperature range (C) Rating Package Group
LM5118-Q1 Order now Buck-Boost     3     75     1.23     70     98     50     500     4.5     Enable
Frequency Synchronization    
10     -40 to 125     Automotive     HTSSOP | 20    
LM25118 Order now Buck-Boost     3     42     1.23     38     98     50     500     4.5     Enable
Frequency Synchronization    
10     -40 to 125     Catalog     HTSSOP | 20    
LM25118-Q1 Order now Buck-Boost     3     42     1.23     38     98     50     500     4.5     Enable
Frequency Synchronization    
10     -40 to 125     Automotive     HTSSOP | 20    
LM34936-Q1 Samples not available Buck-Boost     4.2     30     0.8     30     100     100     600     2     Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
  -40 to 125     Automotive     HTSSOP | 28    
LM5118 Order now Buck-Boost     3     75     1.23     70     98     50     500     4.5     Enable
Frequency Synchronization    
10     -40 to 125     Catalog     HTSSOP | 20    
LM5170-Q1 Order now Boost
Buck    
4     80     4     80     99     50     500     1     Adjustable Current Limit
Adjustable UVLO
Enable
Frequency Synchronization
Light Load Efficiency
Load Disconnect
Multiple Outputs
Phase Interleaving
Power Good
Synchronous Rectification
UVLO Adjustable