LM5175 Texas instruments

LM5175

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LM5175

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Описание

The LM5175 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5175 operates over a wide input voltage range of 3.5 V to 42 V (60 V maximum) to support a variety of applications. The LM5175 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 LM5175 features selectable Continuous Conduction Mode (CCM) or Discontinuous Conduction Mode (DCM) operation, optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.

Single Inductor Buck-Boost Controller for Step-
Up/Step-Down DC/DC Conversion
Wide V_IN Range: 3.5 V to 42 V, 60 V Maximum
Flexible V_OUT Range: 0.8 V to 55 V
V_OUT 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
Selectable CCM or DCM with Pulse Skipping
Available in HTSSOP-28 and QFN-28 Packages

Topology	Buck-Boost
Vin (min) (V)	3.5
Vin (max) (V)	42
Vout (max) (V)	55
Vout (min) (V)	0.8
Duty cycle (max) (%)	100
Switching frequency (min) (kHz)	100
Switching frequency (max) (kHz)	600
Iq (typ) (mA)	1.65
Features	Adjustable current limit, Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, UVLO adjustable
Iout (max) (A)	20
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Type	Controller