SIMPLE SWITCHER® 3.5V to 36V, 1A Synchronous Step-Down Voltage Converter - LM43601

LM43601 (ACTIVE)

SIMPLE SWITCHER® 3.5V to 36V, 1A Synchronous Step-Down Voltage Converter

 

Description

The LM43601 SIMPLE SWITCHER® regulator is an easy to use synchronous step-down DC-DC converter capable of driving up to 1 A of load current from an input voltage ranging from 3.5 V to 36 V (42 V transient). The LM43601 provides exceptional efficiency, output accuracy and drop-out voltage in a very small solution size. An extended family is available in 0.5 A, 2 A and 3 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 under-voltage lockout, cycle-by-cycle current limit, and output short circuit protection. The LM43601 device is available in the HTSSOP / PWP 16 leaded package (5.1 mm × 6.6 mm × 1.2 mm) with 0.65 mm lead pitch. Pin to pin compatible with LM46000, LM46001, LM46002, LM43600, LM43602, LM43603.

Features

  • 33 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 Pre-Biased Load
  • Internal Soft-Start: 4.1 ms
  • Extendable Soft-Start Time by External
    Capacitor
  • Output Voltage Tracking Capability
  • Precision Enable to Program System UVLO
  • Output Short Circuit Protection with Hiccup
    Mode
  • Over Temperature Thermal Shutdown Protection

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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)
Special Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM43601 LM43602 LMR14020 LMR23610 LMR23625 LMR23630
3.5    3.5    4    4.5    4.5    4.5   
36    36    40    36    36    36   
1    1    1    1    1    1   
28    28    36    30    30    30   
1    2    2    1    2.5    3   
1    1    1    1    1    1   
200    200    200    200    200    200   
2200    2200    2500    2200    2200    2200   
0.033    0.027    0.04    0.075    0.075    0.075   
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
Pre-Bias Start-Up
Tracking
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
99    99    98    97    97    97   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
HTSSOP    HTSSOP
SON   
SO PowerPAD    SO PowerPAD    SO PowerPAD
SON   
SO PowerPAD
SON   

Other qualified versions of LM43601

Version Part Number Definition
Automotive LM43601-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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WEBENCH® Designer LM43601

  Min   Max Range
Vin  V 3.5 to 36.0V
Vout  V 1.02 to 28.0V
Iout  A ≤ 1A
Ambient Temp  °C -40 to 125°C


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