LM5161 Wide Input 4.5-V to 100-V, 1-A Synchronous Buck / Fly-Buck Converter | TI.com

LM5161 (ACTIVE)

Wide Input 4.5-V to 100-V, 1-A Synchronous Buck / Fly-Buck Converter

 

Description

The LM5161 is a 100-V, 1-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The constant-ON-time control scheme requires no loop compensation and supports high step-down ratios with fast transient response. An internal feedback amplifier maintains ±1% output voltage regulation over the entire operating temperature range. The ON-time varies inversely with input voltage resulting in nearly constant switching frequency. Peak and valley current limit circuits protect against overload conditions. The under-voltage lockout (EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis. The FPWM input pin in LM5161 selects either the forced continuous conduction mode (CCM) under all load levels or the discontinuous conduction mode (DCM) under light or no load conditions. When operating in forced CCM, the LM5161 supports the multiple output and isolated Fly-Buck applications. When programmed for the DCM operation, the LM5161 provides a tightly regulated buck output without any additional external feedback ripple injection circuit.

Features

  • Wide 4.5-V to 100-V Input Voltage Range
  • Integrated High-Side and Low-Side Switches
    • No Schottky Diode Required
  • 1-A Maximum Load Current
  • Constant ON-Time Control
    • No External Loop Compensation
    • Fast Transient Response
  • Selectable DCM Buck Operation at Light Load
  • CCM Option Supports Multi-Output Fly-Buck™
  • No External Ripple circuit needed (at FPWM = 0)
  • Nearly Constant Switching Frequency
  • Frequency Adjustable Up to 1 MHz
  • Programmable Soft-Start Time
  • Prebias Start-Up
  • Peak Current Limiting Protection
  • Adjustable Input UVLO and Hysteresis
  • ±1% Feedback Voltage Reference
  • Thermal Shutdown Protection
  • Create a Custom Design Using the LM5161 With the WEBENCH® Power Designer

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Parametrics Compare all products in Buck converters (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
Type
Package size: mm2:W x L (PKG)
LM5161 LM5010 LM5010A LM5160A LM5164 LM5164-Q1 LM5575
4.5     8     6     4.5     6     6     6    
100     75     75     65     100     100     75    
2     2.5     2.5     2     1.2     1.2     1.23    
92     70     70     60     90     90     70    
1     1     1     2     1     1     1.5    
1     1     1     1     1     1     1    
50     50     50     50     75     75     50    
1000     1000     1000     1000     1000     1000     500    
2.3     0.65     0.65     2.3     0.01     0.01     1    
Enable
Forced PWM
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Over Current Protection    
Enable
Over Current Protection    
Enable
Forced PWM
Light Load Efficiency
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
Enable
Frequency Synchronization
Over Current Protection
Tracking    
COT with emulated ripple
Constant on-time (COT)    
Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Constant on-time (COT)     Current Mode    
92     99     99     92     99     99     95    
-40 to 125     -40 to 125     -40 to 150     -40 to 125     -40 to 150     -40 to 150     -40 to 125    
Catalog     Catalog     Catalog     Catalog     Catalog     Automotive     Catalog    
HTSSOP | 14     HTSSOP | 14
WSON | 10    
HTSSOP | 14
WSON | 10    
WSON | 12     SO PowerPAD | 8     SO PowerPAD | 8     HTSSOP | 16    
Converter     Converter     Converter     Converter     Converter     Converter     Converter    
14HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 14)     14HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 14)
See datasheet (WSON)    
14HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 14)
See datasheet (WSON)    
See datasheet (WSON)     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)    
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