LM62440-Q1 Automotive 3-V to 36-V, 4-A, low-noise synchronous step-down converter | TI.com

LM62440-Q1 (PREVIEW) Automotive 3-V to 36-V, 4-A, low-noise synchronous step-down converter

 

More information and sample availability

Full datasheet and other design resources are available. Request now

LM61460EVM evaluation module (EVM) is available. Request now

Alternate preproduction samples are available (PLM61460AASQRJRTQ1). This device has the same functionality, pinout and package as the LM62440-Q1 but is not an exact equivalent. Request now

Description

The LM62440-Q1 is an automotive-focused synchronous step-down buck converter providing 0 to 4 A DC load current from a supply voltage ranging from 3.0 V to 36 V with adjustable output voltage or 5-V and 3.3-V fixed output voltage options. The LM62440-Q1 is designed from the ground up for minimal EMI. The device incorporates pseudo-random spread spectrum, adjustable SW node rise time, and low-EMI VQFN-HR package featuring low ringing and optimal-layout-friendly pinout. Switching frequency can be synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. When synchronized, the device switches at fixed frequency over entire load range with FPWM. Factory auto-mode enables frequency foldback when operating with light loads, allowing an unloaded current consumption of only 8 µA (typical) and high efficiency with light loads. Together with very low MOSFET ON resistances and optional external bias input, exceptional efficiency is achieved over entire load range. The device also provides an open-drain PGood output and comprehensive protection features. Electrical characteristics are specified over a junction temperature range of –40°C to +150°C.

Features

  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1, TA range –40°C to +125°C , and TJ range –40°C to +150°C
  • Low EMI
    • Adjustable SW node rise time
    • Spread spectrum to reduce peak emissions
    • Fixed 2.2MHz frequency, or synchronize over 200 kHz – 2.2 MHz range
    • Pin selectable FPWM mode for constant frequency at light loads
    • 4 mm × 3.5 mm low-EMI VQFN-HR package (with wettable flanks) and pinout
  • High efficiency power conversion at all loads
    • 8-µA standby current with VIN = 13.5 V, VOUT = 3.3 V, no load
    • Frequency foldback in light load for improved efficiency with Auto Mode
    • Low MOSFET ON Resistance
      RDS_ON_HS = 41 mΩ (typical)
      RDS_ON_LS = 21 mΩ (typical)
  • Wide Conversion Range
    • Input voltage: 3 V to 36 V
    • Output voltage adjustable from 1 V to 95% of VIN, with factory options for 5-V and 3.3-V fixed output voltage
    • DC load current: 0 A to 4 A
    • tON_MIN = 50 ns (typical)
    • tOFF_MIN = 70 ns (typical)
  • PGood output with filter and delayed release
  • Built-in compensation, soft start, current limits, hiccup protection, thermal shutdown, and UVLO

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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)
LM62440-Q1 Order now 3     36     1     34     4     1     2200     2200     0.009     Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Soft Start Adjustable
Spread Spectrum
Synchronous Rectification
Wettable Flanks Package    
Current Mode     98     -40 to 150     Automotive     VQFN-HR | 14     Converter     14VQFN-HR: 14 mm2: 3.5 x 4 (VQFN-HR | 14)    
LM61440-Q1 Samples not available 3     36     1     34     4     1     200     2200     0.009     Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Soft Start Adjustable
Spread Spectrum
Synchronous Rectification
Wettable Flanks Package    
Current Mode     98     -40 to 150     Automotive     VQFN-HR | 14     Converter     14VQFN-HR: 14 mm2: 3.5 x 4 (VQFN-HR | 14)    
LM61460-Q1 Samples not available 3     36     1     34     6     1     200     2200     0.009     Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Soft Start Adjustable
Spread Spectrum
Synchronous Rectification
Wettable Flanks Package    
Current Mode     98     -40 to 150     Automotive     VQFN-HR | 14     Converter     14VQFN-HR: 14 mm2: 3.5 x 4 (VQFN-HR | 14)    
LM73605-Q1 Order now 3.5     36     1     34     5     1     350     2200     0.015     Enable
Forced PWM
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
Wettable Flanks Package    
Current Mode     96     -40 to 125     Automotive     WQFN | 30     Converter     30WQFN: 24 mm2: 4 x 6 (WQFN | 30)    
LM73606-Q1 Order now 3.5     36     1     34     6     1     350     2200     0.015     Enable
Forced PWM
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Fixed
Wettable Flanks Package    
Current Mode     96     -40 to 125     Automotive     WQFN | 30     Converter     30WQFN: 24 mm2: 4 x 6 (WQFN | 30)    
LMS3635-Q1 Order now 3.5