Rainbow Electronics DS4560 - Manual

General Description
The DS4560 is a self-contained hot-plug switch intend-
ed to be used on +12V power buses to limit through
current and to control the power-up output-voltage
ramp. The device contains an on-board 25m
Ω n-chan-
nel power MOSFET that is actively closed-loop con-
trolled to ensure that an adjustable current limit is not
exceeded. The maximum allowable current through the
device is determined by an external resistor connected
to the ILIM pin.
The DS4560 also contains the ability to control the
power-up output-voltage ramp. A capacitor connected
to the VRAMP pin sets the desired voltage ramp rate.
The output voltage is unconditionally clamped to keep
input overvoltage stresses from harming the load. The
DS4560 also contains an adjustable power-up timer. A
capacitor connected to the TIMER pin determines how
long after power-on reset the DS4560 should wait
before starting to apply power to the load. The TIMER
pin can also be driven with a digital logic output to cre-
ate a device-enable function.
The DS4560 contains an on-board temperature sensor
with hysteresis. If operating conditions cause the
device to exceed an internal thermal limit, the DS4560
either unconditionally shuts down and latches off await-
ing a power-on reset (DS4560S-LO), or it waits until the
device has cooled by the hysteresis amount and then
restarts (DS4560S-AR).
Applications
Features
♦ On-Board 25mΩ Power MOSFET
♦ Adjustable Short-Circuit Current and Overload
Current Limit
♦ Adjustable Output-Voltage Slew Rate
♦ Adjustable Power-Up Timer with External Enable
Capability
♦ Output Overvoltage Limiting
♦ On-Board Thermal Protection
♦ On-Board Charge Pump
♦ Latchoff and Autoretry Versions Available
♦ 9.0V to 13.2V Supply Operation
♦ 8-Pin SO (150 mils) Pb-Free Package
DS4560
12V Hot-Plug Switch
________________________________________________________________ Maxim Integrated Products 1
SO (150 mils)
TOP VIEW
2 7 LOAD VRAMP
1 8 V CC GND
LOAD TIMER 3 6
LOAD ILIM 4 5
DS4560
+
Pin Configuration
Ordering Information
Rev 1; 9/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+ Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
PART
THERMAL
SHUTDOWN
PIN-PACKAGE
DS4560S-LO+ Latchoff 8 SO
DS4560S-LO+T Latchoff 8 SO
DS4560S-AR+ Autoretry 8 SO
DS4560S-AR+T Autoretry 8 SO
Pin Description
PIN NAME FUNCTION
1 GND
Ground. This is also a heat sink for the
device.
2 VRAMP Output-Voltage Ramp Adjustment
3 TIMER Power-Up Timer/Enable
4 ILIM Current-Limit Adjustment
5, 6, 7 LOAD Output Load Connection (MOSFET Source)
8 V CC Input Supply Voltage (MOSFET Drain)
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