TPS40000

Features:

 Operating Input Voltage 2.25 V to 5.5 V
 Output Voltage as Low as 0.7 V
 1% Internal 0.7 V Reference
 Predictive Gate Drive N-Channel MOSFE Drivers for Higher Efficiency
 Externally Adjustable Soft-Start and Overcurrent Limit
 Source-Only Current or Source/Sink Current
 Versions for Starting Into VOUT Pre-Bias
 10-Lead MSOP PowerPad Package for Higher Performance
 Thermal Shutdown
 Internal Boostrap Diode
 Fixed-Frequency, Voltage-Mode Control
   − TPS40000/1/4 300-kHz
   − TPS40002/3/5 600-kHz


Application

 Networking Equipment
 Telecom Equipment
 Base Stations
 Servers
 DSP Power
 Power Modules


Pinout




Specifications

		TPS4000x	UNIT
Input voltage range, VIN	BOOT	VSW + 6.5	V
	COMP, FB, ILIM, SS/SD	-0.3 to 6
	SW	-0.7 to 10.5
	SWT (SW transient < 50 ns)	-2.5
	VDD	6
Operating junction temperature range, TJ		-40 to 150	°C
Storage temperature, Tstg		-55 to 150
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds		260

Description

The TPS4000x are controllers for low-voltage,non-isolated synchronous buck regulators. These TPS4000x  controllers drive an N-channel MOSFET for the primary buck switch, and an N-channel MOSFET for the synchronous rectifier switch, thereby achieving very high-efficiency power conversion. In addition, the TPS4000x  device controls the delays from main switch off to rectifier turn-on and from rectifier turn-off to main switch turn-on in such a way as to minimize diode losses (both conduction and recovery) in the synchronous rectifier with TI's proprietary Predictive Gate Drive technology. The reduction in these losses is significant and increases efficiency. For a given converter power level, smaller FETs can be used, or heat sinking can be reduced or even eliminated.

The current-limit threshold is adjustable with a single resistor connected to the device. The TPS4000x controllers implement a closed-loop soft start function. Startup ramp time of TPS4000x  is set by a single external capacitor connected to the SS/SD pin. The SS/SD pin is also used for shutdown.