LM43603 3.5V to 36V, 3A Synchronous Step-Down Voltage Converter | TI.com

LM43603 (ACTIVE)

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

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

Recommended alternative parts

  • LMZ14203  -  Looking for a power module? Try the LMZ14203

Description

The LM43603 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 abs max). The LM43603 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 device is available in the HTSSOP / PWP 16 leaded package (5.1 mm × 6.6 mm × 1.2 mm) and VSON-16 package with wettable flanks. HTSSOP package is pin-to-pin compatible with LM43600, LM43601, LM43602, LM46000, LM46001, LM46002. VSON-16 package is only pin-to-pin compatible with LM43602.

Features

  • 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 with the WEBENCH® Power Designer

All trademarks are the property of their respective owners.

View more

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 LM2575-N LM2576 LM2596 LM43602 LMR14030 LMR23630 LMR33620 LMR33630 TPS5430 TPS54340
3.5     4     4     4.5     3.5     4     4.5     3.8     3.8     5.5     4.5    
36     40     40     40     36     40     36     36     36     36     42    
1     3.3     3.3     3.3     1     1     1     1       1.23     0.8    
28     37     37     37     28     36     30     34     34     31     41    
3     1     3     3     2     3.5     3     2     3     3     3.5    
1     1     1     1     1     1     1     1     1     1     1    
200     42     42     110     200     200     200     400     400     500     100    
2200     63     63     173     2200     2500     2200     2100     2100     500     2500    
0.027     10     5     5     0.027     0.04     0.075     0.024     0.024     3     0.146    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking    
Enable     Enable     Enable     Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking    
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Tracking
UVLO Adjustable    
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Wettable Flanks Package    
Enable
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification    
Enable     Enable
Frequency Synchronization
Light Load Efficiency
UVLO Adjustable    
Current Mode     Voltage Mode     Voltage Mode     Voltage Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Voltage Mode     Current Mode    
99     98     98     100     99     98     97     98     98     87     98    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125