TPS40074

Features:

• Operation Over 4.5-V to 28-V Input Range
• Fixed-Frequency Voltage-Mode Controller
• Integrated Unity Gain Amplifier for Remote Output Sensing
• Predictive Gate Drive™ Generation II for Improved Efficiency
• <1% Internal 700-mV Reference
• Input Voltage Feed Forward Control
• Prebiased Output Compatible
• Internal Gate Drive Outputs for High-Side and Synchronous N-Channel MOSFETs
• Switching Frequency Programmable to 1 MHz
• 20-Pin QFN Package
• Thermal Shutdown Protection
• Software Design Tool and EVM Available


Application

• Power Modules
• Networking/Telecom
• Industrial
• Servers


Specifications

		TPS40074	UNIT
VDD Input voltage range	VDD, ILIM	30	V
	FB, KFF, PGD, SYNC	0.3 to 6
	SW	0.3 to 40
	SA+, SA-	0.3 to 11
	SW, transient < 50 ns	2.5
VOUT Output voltage range	COMP, RT, SS	0.3 to 6
	BOOST, HDRV	50
	DBP, SAO, LDRV	10.5
	LVBP	6
IOUT Output current source	LDRV, HDRV	1.5	A
IOUT Output current sink	LDRV, HDRV	2.0
	KFF	10	mA
Output current	RT	1
	LVBP	1.5
TJ Operating junction temperature range		40 to 125
Tstg Storage temperature		55 to 150

Description

The TPS40074 is a mid voltage, wide input (4.5-V to 28-V), synchronous, step-down controller, offering design flexibility for a variety of user programmable functions, including; soft start, UVLO, operating frequency, voltage feed-forward and high-side FET
sensed short circuit protection.

The TPS40074 incorporates MOSFET gate drivers for external N-channel high side and synchronous rectifier (SR) MOSFETs. The gate drive logic incorporates second generation predictive anti-cross conduction circuitry to prevent simultaneous high side and synchronous rectifier conduction, while minimizing to eliminating current flow in the body diode of the SR FET. The TPS40074 allows for starting into pre-biased outputs by not allowing the synchronous rectifier FET to turn on until the commanded voltage during soft start is greater than the existing pre-bias voltage.

The TPS40074 uses voltage feed-forward control techniques to provide good line regulation over a wide input voltage range, and fast response to input line transients. Voltage feed-forward of TPS40074 also provides nearly constant power stage gain with input variation to ease loop compensation of wide input range designs. The externally programmable short circuit protection provides fault current limiting, as well as hiccup mode operation for low power dissipation in the presence of a shorted output. The TPS40074 is packaged in a 20-pin QFN package for better thermal performance at higher voltages and frequencies, as well as reduced footprint.