LM34936 30-V Wide VIN Synchronous 4-Switch Buck-Boost Controller | TI.com

LM34936 (ACTIVE) 30-V Wide VIN Synchronous 4-Switch Buck-Boost Controller

 

Description

The LM34936 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM34936 operates over a wide input voltage range of 4.2 V to 30 V (42 V absolute maximum) to support a variety of applications.

The LM34936 employs current-mode control both in buck and boost modes of operation for superior load and line regulation. The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal.

The device also features a programmable soft-start function and offers protection features including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. In addition, the LM34936 features optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.

Features

  • Single Inductor Buck-Boost Controller for Step-Up/Step-Down DC/DC Conversion
  • Wide VIN: 4.2 V (2.5 V with bias) to 30 V (42 V Maximum)
  • Flexible VOUT: 0.8 V to 30 V
  • VOUT Short Protection
  • High Efficiency Buck-Boost Transition
  • Adjustable Switching Frequency
  • Optional Frequency Sync and Dithering
  • Integrated 2-A MOSFET Gate Drivers
  • Cycle-by-Cycle Current Limit and Optional Hiccup
  • Optional Input or Output Average Current Limiting
  • Programmable Input UVLO and Soft-Start
  • Power Good and Output Overvoltage Protection
  • Available in QFN-28 Package
  • Create a Custom Design Using the LM34936 with the WEBENCH Power Designer

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WEBENCH® Designer LM34936

  Min   Max Range
Vin  V 4.2 to 42.0V
Vout  V 0.8 to 30V
Iout  A ≤ 25A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Topology Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Duty cycle (Max) (%) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Iout (Max) (A) Operating temperature range (C) Rating Package Group
LM34936 Order now Buck-Boost     4.2     30     0.8     30     100     100     600     2     Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
  -40 to 125     Catalog     VQFN | 28    
LM5175 Order now Buck-Boost     3.5     42     0.8     55     100     100     600     1.65     Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
20     -40 to 125     Catalog     HTSSOP | 28
VQFN | 28    
LM5176 Order now Buck-Boost     4.2     55     0.8     55     100     100     600     2     Adjustable Current Limit
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable    
  -40 to 125     Catalog     HTSSOP | 28
VQFN | 28