TPS54540B Texas instruments

TPS54540B

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TPS54540B

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Описание

The TPS54540B is a 42-V, 5-A step-down regulator with an integrated high side MOSFET. Current-mode control provides simple external compensation and flexible component selection. A low-ripple pulse-skip mode reduces no-load-supply current to 146 µA. Shutdown supply current is reduced to 2 µA when the EN (enable) pin is pulled low.Undervoltage lockout is internally set at 4.3 V but can be increased using the EN pin. Output voltage start-up ramp is internally controlled to provide a controlled start-up and eliminate overshoot. A wide switching frequency range allows either efficiency or external component size to be optimized. Output current is limited cycle-by-cycle. Frequency foldback and thermal shutdown protects internal and external components during an overload condition.The TPS54540B is available in an 8-pin thermally enhanced HSOIC PowerPAD package.

High efficiency at light loads with pulse skipping Eco-mode™
92-mΩ high-side MOSFET
146-µA operating quiescent current and
2-µA shutdown current
100-kHz to 2.5-MHz Fixed switching frequency
Synchronizes to external clock
Low dropout at light loads with integrated BOOT recharge FET
Adjustable UVLO and hysteresis
0.8 V 1% Internal voltage reference
8-Pin HSOIC with PowerPAD™ package
–40°C to 150°C T_J operating range
Create a custom design using the TPS54540B with the WEBENCH® Power Designer

Vin (min) (V)	4.5
Vin (max) (V)	42
Vout (min) (V)	0.8
Vout (max) (V)	41.1
Iout (max) (A)	5
Iq (typ) (mA)	0.146
Switching frequency (min) (kHz)	100
Switching frequency (max) (kHz)	2500
Features	Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Pre-Bias Start-Up, Soft Start Fixed, Wettable flanks package
Operating temperature range (°C)	-40 to 150
Rating	Catalog
Regulated outputs (#)	1
Control mode	current mode
Duty cycle (max) (%)	98
Type	Converter