Automotive Qualified 3.5V to 36V, 3A Synchronous Step-Down Voltage Converter - LM43603-Q1

LM43603-Q1 (ACTIVE)

Automotive Qualified 3.5V to 36V, 3A Synchronous Step-Down Voltage Converter

 

Description

The LM43603-Q1 SIMPLE SWITCHER® regulator is an easy-to-use synchronous step-down DC-DC converter capable of driving up to 3 A of load current from an input voltage ranging from 3.5 V to 36 V (42 V absolute maximum). The LM43603-Q1 provides exceptional efficiency, output accuracy, and dropout voltage in a very small solution size. An extended family is available in 0.5-A ,1-A, and 2-A load current options in pin-to-pin compatible packages. Peak current mode control is employed to achieve simple control loop compensation and cycle-by-cycle current limiting. Optional features such as programmable switching frequency, synchronization, power-good flag, precision enable, internal soft-start, extendable soft start, and tracking provide a flexible and easy to use platform for a wide range of applications. Discontinuous conduction and automatic frequency modulation at light loads improve light load efficiency. The family requires few external components and pin arrangement allows simple, optimum PCB layout. Protection features include thermal shutdown, VCC undervoltage lockout, cycle-by-cycle current limit, and output short circuit protection. The LM43603-Q1 device is available in the HTSSOP (PWP) 16-pin leaded package (5.1 mm × 6.6 mm × 1.2 mm). The LM43603A-Q1 version is optimized for PFM operation and recommended for new design. The device is pin-to-pin compatible with LM4360x and LM4600x family.

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Operating Junction Temperature
  • 27-µA Quiescent Current in Regulation
  • High Efficiency at Light Load (DCM and PFM)
  • Meets EN55022/CISPR 22 EMI Standards
  • Integrated Synchronous Rectification
  • Adjustable Frequency Range: 200 kHz to 2.2 MHz (500 kHz default)
  • Frequency Synchronization to External Clock
  • Internal Compensation
  • Stable with Almost any Combination of Ceramic, Polymer, Tantalum, and Aluminum Capacitors
  • Power-Good Flag
  • Soft Start into a Pre-Biased Load
  • Internal Soft Start: 4.1 ms
  • Extendable Soft-Start Time by External Capacitor
  • Output Voltage Tracking Capability
  • Precision Enable to a Program System UVLO
  • Output Short Circuit Protection with Hiccup Mode
  • Overtemperature Thermal Shutdown Protection
  • Create a Custom Design Using the LM43603-Q1 With the WEBENCH® Power Designer

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Parametrics Compare all products in Buck Converter (Integrated Switch)

 
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
LM43603-Q1 LM22670-Q1 LM26003-Q1 LM43600-Q1 LM43601-Q1 LM46000-Q1 LM46001-Q1 LM46002-Q1 LM5576-Q1 LMR14030-Q1 LMR16006Y-Q1 LMR23610-Q1 LMR23625-Q1 LMR23630-Q1 TPS54340-Q1
3.5    4.5    3    3.5    3.5    3.5    3.5    3.5    6    4    4    4    4    4    4.5   
36    42    38    36    36    60    60    60    75    40    40    36    36    36    42   
1    1.285    1.25    1    1    1    1    1    1.23    1    0.8    1    1    1    0.8   
28    37    35    28    28    28    28    28    70    30    36    34    34    34    41   
3    3    3    0.5    1    0.5    1    2    3    3.5    0.6    1    2.5    3    3.5   
1    1    1    1    1    1    1    1    1    1    1    1    1    1    1   
200    200    150    200    200    200    200    200    50    200    700    200    200    200    100   
2200    1000    500    2200    2200    2200    2200    2200    500    2500    2100    2200    2200    2200    2500   
0.027    3.4    0.04    0.033    0.033    0.024    0.024    0.027    1    0.04    0.028    0.075    0.075    0.075    0.146   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable    Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable    Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Spread Spectrum
Tracking
UVLO Adjustable   
Enable
Light Load Efficiency
Pre-Bias Start-Up
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
UVLO Adjustable   
Current Mode    Voltage Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
99    90    98    99    99    99    99    99    95    98    97    99    99    99    98   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Automotive   
HTSSOP    SO PowerPAD
TO-263   
HTSSOP    HTSSOP    HTSSOP    HTSSOP    HTSSOP    HTSSOP    HTSSOP    SO PowerPAD
WSON   
SOT-23-THIN    SO PowerPAD    SO PowerPAD    SO PowerPAD    SO PowerPAD   

Other qualified versions of LM43603-Q1

Version Part Number Definition
Catalog LM43603 TI's standard catalog product
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WEBENCH® Designer LM43603-Q1

  Min   Max Range
Vin  V 3.5 to 36.0V
Vout  V 1.011 to 28V
Iout  A ≤ 3A
Ambient Temp  °C -40 to 125°C


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