Rainbow Electronics DS4560 User Manual
General Description
The DS4560 is a self-contained hot-plug switch intended 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 25mΩ n-channel power MOSFET that is actively closed-loop controlled 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 create 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 awaiting 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
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
THER MAL
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 a lso a heat sink for the
device.
2 VRAMP Output-Voltage Ramp Adjustment
3 TIMER Power-Up Timer/Enable
4 ILIM Current-Limit Adju stment
5, 6, 7 LOAD Output Load Connection (MOSFET Source)
8 VCC Input Supply Voltage (MOSFET Drain)
PCI Express is a registered trademark of PCI-SIG Corp.
InfiniBand is a trademark and service mark of the InfiniBand Trade Association.
RAID/Hard Drives
Servers/Routers
PCI/PCI Express
®
InfiniBand
SM
Base Stations
TOP VIEW
+
18V
GND
2 7 LOADVRAMP
DS4560
TIMER 3 6
45
SO (150 mils)
CC
LOAD
LOADILIM
DS4560
12V Hot-Plug Switch
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(TJ= -40°C to +135°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Range on VCCand LOAD Relative to GND
Continuous .........................................................-0.3V to +18V
1ms Maximum ....................................................-0.3V to +22V
Voltage Range on ILIM and VRAMP
Relative to GND.....................................-0.3V to (V
CC
+ 0.3V),
but not to exceed +18V
Voltage Range on TIMER Relative to GND ...........-0.3V to +5.0V
Drain Current
Continuous ...........................................................................4A
Peak ...................................................................................15A
Operating Junction Temperature Range...........-40°C to +135°C
Storage Temperature Range .............................-55°C to +135°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
ELECTRICAL CHARACTERISTICS
(VCC= +12V, TJ= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VCC (Notes 1, 2) 9.0 13.2 V
R
Value R
ILIM
C
C
TIMER Turn-On Voltage VON 2.6 5 V
TIMER Turn-Off Voltage V
Value C
VRAMP
Value C
TIMER
20 400
ILIM
0.04 5.00 μF
VRAMP
0.04 5.00 μF
TIMER
-0.3 +2.0 V
OFF
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current ICC (Note 3) 1.1 2.00 mA
UVLO Ri sing V
UVLO Falling V
UVLO Hysteresis V
On-Resistance RON 25 32 m
MOSFET Output Capacitance C
LOAD Voltage During Off State V
Dela y Time from Enable to
Beginning of Conduction
Gate-Charging Time from
Conduction to 90% of V
Shutdown Junction Temperature T
Thermal Hysteresis T
TIMER Charging Current I
Overvoltage Clamp V
OUT
7.5 8.0 8.5 V
UVLOR
6.5 7.0 7.5 V
UVLOF
1 V
UVLOH
500 pF
OUT
(Note 4) 200 mV
LOFF
t
C
POND
t
C
GCT
(Note 5) 120 135 150 °C
SHDN
(Note 5) 40 °C
HYS
70 80 92 μA
TIMER
13.5 15.0 16.5 V
OVC
= 1μF 5 ms
VRAMP
VRAMP
= 1μF, C
= 1000μF 48 66 80 ms
LOAD
DS4560
12V Hot-Plug Switch
_______________________________________________________________________________________ 3
Note 1: All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are negative.
Note 2: This supply range guarantees that the LOAD voltage is not clamped by the overvoltage limit.
Note 3: Supply current specified with no load on the LOAD pin.
Note 4: V
LOFF
voltage specified with a 2.5mA load applied to LOAD.
Note 5: Not production tested. Guaranteed by design.
Note 6: I
SCL
is the current limit when the output voltage is initially ramping up.
Note 7: I
OVL
is the current limit after the output voltage ramping is complete.
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +12V, TJ= +25°C, unless otherwise noted.)
Typical Operating Characteristics
(V
CC
= 12V, TA = +25°C, R
ILIM
= 56Ω, VCC= 12V, C
TIMER
= 0.1µF, C
VRAMP
= 0.1µF, unless otherwise noted.)
Short-Circuit Limit I
Overload Limit I
LOAD Voltage Slew Rate SR
VRAMP Charging Current I
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
R
SCL
R
OVL
C
LOAD
70 80 92 μA
VRAMP
= 56 (Note 6) 2.0 2.5 3.0 A
ILIM
= 56 (Note 7) 3.5 4.4 5.9 A
ILIM
= 1μF 0.13 0.15 0.18 V/ms
VRAMP
CURRENT LIMIT vs. R
10
1
CURRENT LIMIT (A)
ILIM
I
OVL
I
SCL
DS4560 toc01
CURRENT LIMIT (A)
CURRENT LIMIT vs. TEMPERATURE
7
6
5
4
3
2
1
I
OVL
I
SCL
OVERVOLTAGE CLAMP vs. TEMPERATURE
16.4
16.2
DS4560 toc02
16.0
15.8
15.6
15.4
OVERVOLTAGE CLAMP (V)
15.2
NO LOAD
10Ω LOAD
DS4560 toc03
0.1
100
R
(Ω)
ILIM
ON-RESISTANCE vs. TEMPERATURE
45
40
35
(mΩ)
ON
R
30
25
20
-40 140
TEMPERATURE (°C)
0
100010
-40 140
TEMPERATURE (°C)
12010080604020-20 0
15.0
-40 140
TEMPERATURE (°C)
12010080604020-20 0
TYPICAL DS4560 TURN-ON WAVEFORMS
SUPPLY CURRENT vs. TEMPERATURE
2.00
1.75
DS4560 toc04
1.50
1.25
(mA)
1.00
CC
I
0.75
0.50
0.25
0
120100806040200-20
-40 140
TEMPERATURE (°C)
DS4560 toc05
5V/div
0V
120100-20 0 20 6040 80
= 18V, 10Ω RESISTIVE LOAD
V
CC
V
CC
TIMER
LOAD
2ms/div
DS4560 toc06
VRAMP
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