TPS2306 Datasheet, PDF (1/28 Pages) Texas Instruments – DUAL SEQUENCING HOT SWAP POWER MANAGER

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TPS2306
DUAL SEQUENCING HOT SWAP POWER MANAGER
D Wide Input Operating Range (2.75 V to
13.6 V)
D Controls Ramp-Up Sequence and Slope,
and Ramp-Down Sequence
D Controls Inrush Current
D Precise Linear Current Amplifier for High
Efficiency and Low Voltage Drop
D Programmable Overcurrent Threshold
D Programmable Soft-Start Capability and
Fault Timer
D Internal Charge Pump Drives Low-Cost
External NMOS Devices
D Cascadable for Three or More Supplies
D Fault Indicator Output
D Direct-drive of Bus Switch
D Shutdown Control with Low-Current Sleep
Mode (40 µA)
D Input Undervoltage Lockout
D 16-pin SOIC package
SLVS368 – APRIL 2001
DW PACKAGE
TOP VIEW
IMAX1 1
UP1 2
ENBL 3
IREF 4
CT 5
GND 6
UP2 7
IMAX2 8
16 VCC/CS1
15 DOWN1
14 GATE1
13 FAULT
12 CPUMP
11 GATE2
10 DOWN2
9 CS2
The TPS2306 Hot Swap Power Manager (HSPM) IC provides hot-swap control, fault handling and power supply
sequencing of two positive voltage supplies. The TPS2306 operates over a wide supply range allowing single
part inventory for a variety of output voltages.
During the transient period of a live insertion or hot-swap event, the TPS2306 actively limits the inrush current
to the plug-in module. An on-chip linear current amplifier (LCA) provides closed-loop control of the current
sourced to the load circuitry on the module. Subsequently, during normal steady-state loading conditions and
in conjunction with an internal high-voltage charge pump, the LCA provides direct gate drive to fully enhance
the external NMOS pass devices. In addition, the < 4-mV input offset voltage of the LCA allows for the use of
low-value sense resistors. Together, these features minimize the insertion loss across the hot-swap interface.
Control inputs allow the designer to program the maximum current level and the inrush current profile (slew rate)
during start-up. Direct programming of the fault time-out also allows the user to establish how long the HSPM
can operate in the current control mode prior to turning off the pass elements. The high degree of user
programmability allows the TPS2306 to be configured for the specific load and bulk capacitance charging
requirements of the target system.
A second level of power bus protection is provided in the form of fast overcurrent comparators monitoring the
load current levels of the two channels. Should a short-circuit event’s edge rate ever exceed the slew rate of
the LCA, the overcurrent comparator immediately latches off the external NMOS devices, overriding the timeout
period. The overcurrent threshold is also user-programmable.
Supply sequencing control is provided via four comparator inputs to independently control the ramp-up and
ramp-down of each supply output (see Figure 1). The TPS2306 also provides a TTL and CMOS compatible
enable input for external control of the supply outputs, and a low-power sleep mode. Also, the open-drain FAULT
output provides single-line fault reporting to the system host for the two monitored supplies.
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.
QuickSwitch^ is a registered trademark of Integrated Device Technology, Inc.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright  2000, Texas Instruments Incorporated
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