TPS24720 Datasheet, PDF (1/37 Pages) Texas Instruments – 2.5-V to 18-V High-Efficiency Adjustable Power-Limiting Hot-Swap Controller With Current

TPS24720
www.ti.com
SLVSAL1B – MARCH 2011 – REVISED MAY 2011
2.5-V to 18-V High-Efficiency Adjustable Power-Limiting Hot-Swap Controller With Current
Monitor and Overvoltage Protection
Check for Samples: TPS24720
FEATURES
1
• 2.5-V to 18-V Operation
• Accurate Current Limiting for Startup
• Programmable FET SOA Protection
• Adjustable Current Sense Threshold
• Programmable Fault Timer
• Power-Good Output
• Fast Breaker for Short-Circuit Protection
• Analog Load-Current Monitor Output
• Programmable UV and OV
• Low-current Standby Mode
• FET Fault Detection Flag
• 3-mm × 3-mm, 16-Pin QFN package
APPLICATIONS
• Server Backplanes
• Storage Area Networks (SAN)
• Telecommunications Mezzanine Cards
• Medical Systems
• Plug-In Modules
• Base Stations
DESCRIPTION
The TPS24720 is an easy-to-use, full-featured protection device for 2.5-V to 18-V power rails. This hot-swap
controller drives an external N-channel MOSFET, while protecting source, load and external MOSFET against
multiple potentially damaging events. During startup, load current and MOSFET power dissipation are limited to
user-selected values. After startup, currents above the user-selected limit will be allowed to flow until
programmed timeout – except in extreme overload events when load is immediately disconnected from source.
Programmable power limiting ensures the external MOSFET operates inside its safe operating area (SOA) at all
times. This allows use of smaller FETs while improving system reliability. Power good, Fault, FET Fault, and
current monitor outputs are provided for system status monitoring and downstream load control.
V_IN
R₇
R₁
90.9 kΩ
R₂
2.94 kΩ
R₃
10 kΩ
TYPICAL APPLICATION (12 V at 10 A)
R_SENSE
M₁
2 mΩ _CSD16403Q5
V_OUT
C₁
0.1 μF
R_SET
R_GATE
3V
51.1 Ω 10 Ω
C_OUT
470 μF
SET SENSE GATE OUT
R₄
3.01 kΩ
R₅
3.01 kΩ
R₆
3.01 kΩ
VCC
FLTb
EN
PGb
TPS24720
FFLTb
OV
ENSD
IMON
PROG LATCH GND TIMER
R_PROG
53.6 kΩ
C_T
56 nF
R_IMON
1.43 kΩ
V_UVLO = 10.83 V
V_OV = 14.02 V
I_LMT = 12 A
t_FAULT = 7.56 ms
PINOUT
RGT Package
(Top View)
EN 1
PROG 2
TIMER 3
GND 4
Thermal
Pad
12 VCC
11 SENSE
10 GATE
9 FFLTb
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated