LM25141-Q1 (ACTIVE)

Automotive, 2.2MHz, Low Iq Synchronous Buck Controller With Frequency Spread Spectrum

Automotive, 2.2MHz, Low Iq Synchronous Buck Controller With Frequency Spread Spectrum - LM25141-Q1
 

Description

The LM25141-Q1 is a synchronous buck controller, intended for high-voltage, wide-VIN, step-down regulator applications. The control method is peak current-mode control. Current-mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. The LM25141-Q1 features slew rate control to simplify the compliance with CISPR and automotive EMI requirements.

The LM25141-Q1 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate drivers with slew rate control can be adjusted to reduce EMI.

In light or no-load conditions, the LM25141-Q1 operates in skip cycle mode for improved low power efficiency. The LM25141-Q1 has a high-voltage bias regulator with automatic switch-over to an external bias to reduce the IQ current from VIN. Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup-mode fault protection for sustained overload, and power-good output.

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 C4B
  • VIN 3.8 V to 42 V (47 V Absolute Maximum)
  • Output: Fixed 3.3 V, 5 V, or Adjustable From
    1.5 V to 15 V With ±0.8% Accuracy
  • Optional Frequency Shift by Varying an Analog Voltage or RT Resistor
  • Meets CISPR 25 / EN 55025 EMI Standards
    • Fixed 2.2-MHz or 440-kHz Switching Frequency With ±5% Accuracy
    • High-Side and Low-Side Gate Drive With Slew Rate Control
    • Optional Spread Spectrum
  • Optional Synchronization to an External Clock
  • Shutdown Mode IQ: 10 µA Typical
  • Low Standby Mode IQ: 35 µA Typical
  • 75-mV Current Limit Threshold With ±0.9% Accuracy
  • External Resistor or DCR Current Sensing
  • Output Enable Logic Input
  • Hiccup Mode for Sustained Overload
  • Power-Good Indication Output
  • Selectable Diode Emulation or Forced PWM
  • VQFN-24 Package With Wettable Flanks
  • Create a Custom Design Using the LM25141-Q1 With the WEBENCH® Power Designer

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Parametrics Compare all products in Buck Controller (External Switch)

 
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
Control Mode
LM25141-Q1 LM25117-Q1 LM5117-Q1 TPS40170-Q1
3.8    4.5    5.5    4.5   
42    42    65    60   
1.5    0.8    0.8    0.6   
15    41    62    57   
20    20    20    20   
1    1    1    1   
1    1    1    1   
350    50    50    100   
2600    750    750    600   
0.035    4.8    4.8    4.5   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
UVLO Fixed   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
Tracking
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
Tracking
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable   
99    98    98    95   
-40 to 125    -40 to 125    -40 to 125    -40 to 125   
Automotive    Automotive    Automotive    Automotive   
VQFN    HTSSOP
WQFN   
HTSSOP
WQFN   
VQFN   
Current Mode    Current Mode    Current Mode    Voltage Mode   

Other qualified versions of LM25141-Q1

Version Part Number Definition
Catalog LM25141 TI's standard catalog product
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WEBENCH® Designer LM25141-Q1

  Min   Max Range
Vin  V 3.8 to 42.0V
Vout  V 1.5 to 15V
Iout  A ≤ 10A
Ambient Temp  °C -40 to 125°C


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