TPS54340B 42-V input, 3.5-A, step-down DC/DC converter with Eco-mode™ | TI.com

TPS54340B (ACTIVE)

42-V input, 3.5-A, step-down DC/DC converter with Eco-mode™

 

Description

The TPS54340B is a 42-V, 3.5-A, step-down regulator with an integrated high side MOSFET. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no-load supply current to 146 µA. Shutdown supply current is reduced to 2 µA when the enable pin is pulled low.

Undervoltage lockout is internally set at 4.3 V but can be increased using the enable pin. The output voltage start-up ramp is internally controlled to provide a controlled start-up and eliminate overshoot.

A wide switching-frequency range allows either efficiency or external component size to be optimized. Frequency foldback and thermal shutdown protect internal and external components during an overload condition.

The TPS54340B is available in an 8-pin thermally enhanced HSOIC PowerPAD™ package.

Features

  • 4.5-V to 42-V (45-V Abs Max) Input Range
  • 3.5-A Continuous Current, 4.5-A Minimum Peak Inductor Current Limit
  • Current Mode Control DC/DC Converter
  • 92-mΩ High-Side MOSFET
  • High Efficiency at Light Loads with Pulse Skipping Eco-mode™
  • Low Dropout at Light Loads with Integrated BOOT Recharge FET
  • 146-µA Operating Quiescent Current
  • 2-µA Shutdown Current
  • 100-kHz to 2.5-MHz Fixed Switching Frequency
  • Synchronizes to External Clock
  • Adjustable UVLO Voltage and Hysteresis
  • Internal Soft Start
  • Accurate Cycle-by-Cycle Current Limit
  • Thermal, Overvoltage, and Frequency Foldback Protection
  • 0.8 V 1% Internal Voltage Reference
  • 8-Pin HSOIC with PowerPAD™ Package
  • –40°C to 150°C TJ Operating Range
  • Create a Custom Design using the TPS54340B with the WEBENCH® Power Designer

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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)
TPS54340B Order now   42       41.1     3.5                   -40 to 150     Catalog     SO PowerPAD | 8       8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
LM43603 Order now 3.5     36     1     28     3     1     200     2200     0.027     Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Synchronous Rectification
Tracking    
Current Mode     99     -40 to 125     Catalog     HTSSOP | 16
SON | 16    
Converter     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)
See datasheet (SON)    
LMR14030 Order now 4     40     1     36     3.5     1     200     2500     0.04     Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Tracking
UVLO Adjustable    
Current Mode     98     -40 to 125     Catalog     SO PowerPAD | 8     Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)    
LMR23630 Order now 4.5     36     1     30     3     1     200     2200     0.075     Enable
Forced PWM
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable
Wettable Flanks Package    
Current Mode     97     -40 to 125     Catalog     SO PowerPAD | 8
SON | 12    
Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
See datasheet (SON)    
LMR33630 Order now 3.8     36     1     34     3     1     400     2100     0.024     Enable
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Wettable Flanks Package    
Current Mode     98     -40 to 125     Catalog     SO PowerPAD | 8
VQFN-HR | 12    
Converter     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)
12VQFN-HR: 6 mm2: 3 x 2 (VQFN-HR | 12)    
TPS54240 Order now 3.5     42     0.8     39