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TPS25921 Datasheet Preview

TPS25921 Datasheet

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TPS25921A, TPS25921L
SLVSCE1C – AUGUST 2014 – REVISED NOVEMBER 2015
TPS25921x 4.5V - 18V eFuse with Precise Current Limit and Over Voltage Protection
1 Features
1 4.5 V – 18 V Operating Voltage, 20 V (Max)
• 90 mΩ RDS(ON) (Typical)
• 0.4 A to 1.6 A Adjustable Current Limit
• ±2% Accurate ILIMIT at 1A at 25°C
• ±3% Overvoltage, Undervoltage Threshold
• Programmable dVO/dt Control
• Fault Output for Thermal Shutdown, UVLO and
OVP
• -40°C to 125°C Junction Temperature Range
• Auto-Retry and Latch-Off Versions
• UL2367 Recognized - File No. E169910
• UL60950 - Safe during Single Point Failure Test
2 Applications
• White Goods, Appliances
• Set Top Boxes, DVD and Gaming Consoles
• HDD and SSD drives
• Smart Meters, Gas Analyzers
• Smart Load Switch
• USB Switch
• Adapter Power Devices
3 Description
The TPS25921 is a compact, feature rich eFuse with
a full suite of protection functions. The wide operating
voltage allows control of many popular DC buses.
The precise ±2% current limit, at room temperature,
provides excellent accuracy making the TPS25921
well suited for many system protection applications.
Load, source and device protection are provided with
multiple programmable features including overcurrent,
overvoltage and undervoltage. 3% threshold accuracy
for UV and OV, ensures tight supervision of bus
voltages, eliminating the need for supervisor circuitry.
Fault flag output (FLT) is provided for system status
monitoring and down stream load control.
For hot-plug-in boards, TPS25921 provides in-rush
current control and programmable output ramp-rate.
Output ramp rate is programmable using a capacitor
at soft-start (SS) pin, for maximum design flexibility.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS25921A
TPS25921L
SOIC
4.90mm x 3.91mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Application Schematic
V(IN) 4.5 to 18 V
IN
OUT
Load
12V Short Circuit Response
90mO
ENUV
FLTb
V(OUT)
OVP
FLT
SS
ILIM
V(IN)
GND TPS25921x
I_IN
TIME = 20 ms/div
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




etcTI

TPS25921 Datasheet Preview

TPS25921 Datasheet

eFuse

No Preview Available !

TPS25921A, TPS25921L
SLVSCE1C – AUGUST 2014 – REVISED NOVEMBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Application Schematic .......................................... 1
5 Revision History..................................................... 2
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 3
7.1 Absolute Maximum Ratings ...................................... 3
7.2 ESD Ratings ............................................................ 3
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Characteristics ........................................... 4
7.5 Electrical Characteristics........................................... 5
7.6 Timing Requirements ................................................ 6
7.7 Typical Characteristics .............................................. 7
8 Parametric Measurement Information ............... 11
9 Detailed Description ............................................ 12
9.1 Overview ................................................................. 12
9.2 Functional Block Diagram ....................................... 12
9.3 Feature Description................................................. 13
9.4 Device Functional Modes........................................ 17
10 Applications and Implementation...................... 18
10.1 Application Information.......................................... 18
10.2 Typical Application ................................................ 18
10.3 System Examples ................................................. 25
11 Power Supply Recommendations ..................... 28
11.1 Transient Protection .............................................. 28
11.2 Output Short-Circuit Measurements ..................... 29
12 Layout................................................................... 30
12.1 Layout Guidelines ................................................. 30
12.2 Layout Example .................................................... 30
13 Device and Documentation Support ................. 31
13.1 Related Links ........................................................ 31
13.2 Community Resources.......................................... 31
13.3 Trademarks ........................................................... 31
13.4 Electrostatic Discharge Caution ............................ 31
13.5 Glossary ................................................................ 31
14 Mechanical, Packaging, and Orderable
Information ........................................................... 31
5 Revision History
Changes from Revision B (August 2015) to Revision C
Page
• Changed Equation 2 From: 0.07 To: 70 pF, and added text "where C(ss) is in Farad" ....................................................... 14
• Changed Equation 21 From: (1 + 0.07) To: (1 x10-9 + 70 x 10-12) ....................................................................................... 22
• Changed Equation 26 From: (4.7 + 0.07) To: (4.7 x10-9 + 70 x 10-12) ................................................................................. 22
Changes from Revision A (March 2015) to Revision B
Page
• Changed tss in Timing Requirements From: V(OUT) = 11.7 V To V(OUT) = 11 V and C(SS) = 1 nF To: C(SS) = 1.2 nF .............. 6
Changes from Original (August 2014) to Revision A
Page
• Changed Features From: UL2367 Recognition Pending To: UL2367 Recognized - File No. E169910 ............................... 1
• Moved the Storage temperature range From: Handling Ratingstable To : Absolute Maximum Ratings .............................. 3
• Changed the Handling Ratings table To: ESD Ratings ......................................................................................................... 3
• Changed Equation 31 From: V(IN) x I(LOAD) To: V(IN) + I(LOAD). ............................................................................................... 28
2
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Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: TPS25921A TPS25921L


Part Number TPS25921
Description eFuse
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