TPS40190

Features:

• Input Operating Voltage Range: 4.5 V to 15 V
• Reference 0.591 V ±1%
• Voltage Mode Control
• Internal 5-V Regulator For Internal
   Housekeeping, Driver Power and Light
   External Loads
• Selectable Short-Circuit Protection
  Thresholds
• Pre-Bias Ouput Safe
• Fixed Switching Frequency of 300 kHz
• Internal Soft-Start
• Small 3 mm × 3 mm, 10-Pin SON Package
• Bootstrapped Drivers for N-Channel MOSFET
• Adaptive Anti-Cross Conduction
• Internal Bootstrap Diode
• 1.2-A Drivers for Decreased Switching Loss


Application

• Cable modem CPE
• Digital Set Top Box
• Graphics/Audio Cards
• Entry-level and Mid-Range Servers


Pinout




Specifications

 

	TPS40190	TPS40190	UNIT
VDD          Input voltage range	VDD	0.3 to 16.5	V
	SW	5 to 22
	BOOST-SW, HDRV-SW (differential from BOOST or HDRV to SW)	0.3 to 6
	COMP	0.3 to 3
	FB, BP5, LDRV, ENABLE	0.3 to 6
TJ           Operating junction temperature range		40 to 125	°C
Tstg         Storage temperature		55 to 150

Description

The TPS40190 is a cost-optimized synchronous buck controller that operates from 4.5 V to 15 V nominally, and implements a fixed frequency voltage mode power supply. The controller uses an adaptive anti-cross conduction scheme to prevent both the high-side and the rectifier MOSFET to be turned on at the same time, preventing shoot through current in the two MOSFETs.

The controller TPS40190 also provides a short circuit protection threshold that is user selectable between one of three values. The protection level is set with a single external resistor connected from COMP to GND. During start-up, the impedance connected to COMP is sensed, and the information is decoded to select one of the three thresholds. When the controller TPS40190 senses an output short circuit, both MOSFETs are turned off and a timeout period is observed before attempting to restart. This provides limited power dissipation in the event of a sustained fault.

The TPS40190 provides strong drivers to minimize switching losses in the power stage, reducing heat build up in the MOSFETs and allowing larger MOSFETs to be used without undue switching time penalty.