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SLUS529 – MAY 2002
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ꢌꢍ ꢀꢎ ꢇ ꢏꢐ
ꢎ ꢍꢏ ꢒ ꢊꢌꢊꢓ ꢍꢏ
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DESCRIPTION
FEATURES
The TPS2346 Optical Network Hot Swap Power
Manager (HSPM) provides highly-integrated supply
control of three positive (3.3-V, 5-V, and 5.15-V) and one
negative (–5.2-V) supply rails with a minimum number
of external components. A linear current amplifier (LCA)
in each of the four device channels provides
closed-loop control of load current during insertion and
extraction events. This allows the designer to configure
the plug-in card’s maximum inrush slew rate and
magnitude according to the requirements of the system
supplies.
D
Enables Hot Swap in High Availability Optical
Network Systems
D
D
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Programmable Current Slew Rate
Power Supply Sequencing
Sense Resistors Set Peak Current (IMAX)
Overcurrent Circuit Breaker at 2× IMAX
Precharge Output
Logic Low Power Good Output
Logic Low Enable Input
On-Chip Charge Pump
Low Sleep Mode Current
APPLICATIONS
Undervoltage Lockout (UVLO)
Minimal External Parts Count
24-pin TSSOP Package
D
Hot Swap of ONET Modules
D
Supply Power-Up/Power-Down Sequencing
TYPICAL APPLICATION
R1
Q1
PLUG–IN MODULE
5.15V
5V
5.15 V
R2
2 mΩ
3 mΩ
Q2
5 V
R6
10 kΩ
R7
1.2 kΩ
D1
6.8 V
CS1 GATE1 VS1
VIN2 CS2
C1
0.1 µF
VIN1
GATE2
VS2
C3
0.1 µF
ENABLE
PG
ENABLE
PG
CPUMP
AGND
CPGND
VS3
RGND
IRAMP
TPS2346
GND
C2
0.39 µF
PRECHG
VIN4
GATE3
D2 6.8 V
CS4 GATE4 VS4
VIN3 CS3
3.3 V
3.3 V
Q3
R3
Q4
R4
0.2 Ω
2 mΩ
R5
10 kΩ
–5.2 V
–5.2 V
R8
10 Ω
R
BRIDGE DEVICE
AD[00]
P
EXAMPLE SIGNAL LINE
AD[00]
AD[XX:01]
AD[XX:01]
ADDRESS/DATA BUS
UDG–02080
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Copyright 2002, Texas Instruments Incorporated
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ꢝ ꢡ ꢞ ꢝꢖ ꢗꢫ ꢙꢘ ꢜ ꢤꢤ ꢢꢜ ꢚ ꢜ ꢛ ꢡ ꢝ ꢡ ꢚ ꢞ ꢦ
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1
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