TPS40074RHLR

Switching Frequency :
Duty Cycle (Max) :
Input Voltage : 4.5 V to 28 V
Number of Outputs : 1
Maximum Operating Temperature : + 85 C
Mounting Style : SMD/SMT
Output Current : 20 A
Output Voltage : 0.7 V to 23 V
Package / Case : QFN-20, 4.5 x 3.5


Description

The TPS40074RHLR belongs to TPS40074 family which 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 fre- quency, voltage feed-forward and high-side FET sensed short circuit protection. The TPS40074RHLR incorporates MOSFET gate drivers for external N-channel high side and synchronous rectifier (SR) MOSFETs using voltage feed-forward control techniques to provide good line regulation over a wide input voltage range, and fast response to input line transients. 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 TPS40074RHLR is packaged in a 20-pin QFN package for better thermal performance at higher voltages and frequencies, as well as reduced footprint. Voltage feed-forward of TPS40074RHLR also provides nearly constant power stage gain with input variation to ease loop compensation of wide input range designs. The gate drive logic incor- porates second generation predictive anti-cross con- duction 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 TPS40074RHLR allows for starting into pre-biased outputs by not allowing the synchronous rectifier FET to turn on until the com- manded voltage during soft start is greater than the existing pre-bias voltage.

The features of TPS40074RHLR can be summarized as (1)operation over 4.5-V to 28-V input range; (2)<1% Internal 700-mV reference; (3)fixed-frequency voltage-mode controller; (4)predictive gate drive generation II for improved efficiency; (5)prebiased output compatible; (6)internal gate drive outputs for high-side and synchronous N-Channel MOSFETs; (7)integrated unity gain amplifier for remote output sensing; (8)input voltage feed forward control; (9)switching frequency programmable to 1 MHz; (10)20-Pin QFN Package; (11)thermal shutdown protection; (12)software design tool and evm available.

The absolute maximum ratings of TPS40074RHLR are (1)VDD Input voltage range, VDD, ILIM: 30V, FB, KFF, PGD, SYNC: 0.3 to 6V, SW: 0.3 to 40V, SA+, SA-: 0.3 to 11V, SW, transient < 50 ns: 2.5 V; (2)VOUT output voltage range, COMP, RT, SS: 0.3 to 6V, BOOST, HDRV: 50V, DBP, SAO, LDRV: 10.5V, LVBP: 6V; (3)IOUT output current source, LDRV, HDRV: 1.5A; (4)IOUT output current sink, LDRV, HDRV: 2.0A, KFF: 10A; (5)output current, RT: 1 mA, LVBP: 1.5mA; (6)TJ operating junction temperature range: 40 to 125°C; (7)Tstg storage temperature: 55 to 150°C.

Parameters:

Technical/Catalog Information	TPS40074RHLR
Vendor	Texas Instruments (VA)
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	2
Voltage - Input	4.5 ~ 28 V
Voltage - Output	-
Current - Output	-
Power - Output	-
Package / Case	20-QFN
Packaging	Digi-Reel?
Internal Switch(s)	No
Synchronous	Yes
Rds (On)	-
Operating Temperature	-40°C ~ 85°C
Frequency - Switching	1MHz
Drawing Number	296; 4205346-2; RHL; 20
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	TPS40074RHLR TPS40074RHLR 296 18670 6 ND 296186706ND 296-18670-6