LM25018 Texas instruments

LM25018

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LM25018

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Описание

The LM25018 device is a 48-V, 325-mA synchronous step-down regulator with integrated high-side and low-side MOSFETs. The constant on-time (COT) control scheme employed in the LM25018 device requires no loop compensation, provides excellent transient response, and enables very high step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high-voltage startup regulator provides bias power for internal operation of the IC and for integrated gate drivers.A peak current-limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows the input undervoltage threshold and hysteresis to be independently programmed. Other protection features include thermal shutdown and bias supply undervoltage lockout.The LM25018 device is available in WSON-8 and SO Power PAD-8 plastic packages.

Wide 7.5-V to 48-V input range
Integrated 325-mA, high-side and low-side switches
No schottky required
Constant on-time control
No loop compensation required
Ultra-fast transient response
Nearly constant operating frequency
Intelligent peak current limit
Adjustable output voltage from 1.225 V
Precision 2% feedback reference
Frequency adjustable to 1 MHz
Adjustable undervoltage lockout
Remote shutdown
Thermal shutdown
Create a custom design using the LM25018 with the WEBENCH Power Designer

Vin (min) (V)	7.5
Vin (max) (V)	48
Vout (min) (V)	1.25
Vout (max) (V)	40
Iout (max) (A)	0.3
Switching frequency (min) (kHz)	50
Switching frequency (max) (kHz)	1000
Features	Synchronous rectification
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Regulated outputs (#)	1
Control mode	Constant on-time (COT)
Duty cycle (max) (%)	90