UCC3923 Datasheet, PDF (1/10 Pages) Texas Instruments – HIGH-VOLTAGE HOT-SWAP POWER MANAGER

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UCC3923, UCC3924, UCC3925, UCC3926, UCC3927, UCC3928
HIGHĆVOLTAGE HOTĆSWAP POWER MANAGER
SLUS471 – NOVEMBER 2000
D Wide Supply Range ±20 V to ±100 V
D Smooth Output Ramping Using Linear
PW PACKAGE
(TOP VIEW)
Current Amplifier
D Undervoltage and Overvoltage Shutdown
PG1
1
20
PG2
2
19
D Sequenced Open-Drain Outputs for Five
PG3
3
18
DC-To-DC Converters
PG4
4
17
D Open-Drain Fault Output
PG5
5
16
FAULT
6
15
D ON Input Referenced to Positive Supply
FLTTIME-
7
14
(UCC3923)
GATE
8
13
D ON Input referenced to Negative Supply
(possible alternative version)
GND
9
12
INSA
10
11
D Dual Insertion Detection Inputs
D Electrostatic-Discharge Protection
– Human-Body-Model 2 kV
– Machine Model 200 V
PACKAGE
(TOP VIEW)
D OR P PACKAGE
(TOP VIEW)
FAULT
1
14
FLTTIME
2
13
GATE
3
12
FAULT
1
8
–VIN
GND
4
11
FLTTIME
2
7
ON
INSA
5
10
GATE
3
6
ISENS _INSB
6
9
GND
4
5
IRAMP _IRAMP
7
8
–VIN
UVLO
SEQTIME
REF
DRAINSENS
OLVO
ON
ISENS
IRAMP
INSB
–VIN
UVLO
PG
REF
DRAINSENS
ON
ISENS
description
The UCC3923 family of devices are Hot-Swap Power Managers for use with negative power supplies. These
devices are optimized for use in systems with nominal –48-V supplies, but are fully functional over a supply
range of –20 V to –200 V. These devices can be used both on plug-in cards and on back-planes to limit inrush
current, control load turnon and turnoff, report faults, isolate faulty loads, and sequence downstream dc-to-dc
converters.
The UCC3923 offers the basic features of controlled turnon, load current ramping, and logic output of fault status
in a tiny 8-pin package. The UCC3924 adds undervoltage protection, two insertion detection pins, power-good
sensing, one output for downstream converter enabling, and a reference for cascoding, in a 14-pin package.
The UCC3925 has all of the previously noted features plus overvoltage protection and supply sequencing for
up to five downstream converters in a 20-pin package.
AVAILABLE OPTIONS
PACKAGED DEVICES^†
TA
ENABLE
TSSOP–8
TSSOP–14
TSSOP–20
–40_C to 85_C
Active high
Active low
UCC3923
UCC3926
UCC3924
UCC3927
UCC39235
UCC3928
† _{All packages are available left end taped and reeled. Add an R suffix to the device type (e.g.,}
UCC3923PWPR) to order quantities of 2000 devices per reel.
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.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
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Copyright © 2000, Texas Instruments Incorporated
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