ISL6160 Datasheet, PDF (5/11 Pages) Intersil Corporation – InfiniBand +12V Bulk and +5V Auxiliary Power Controller

ISL6160
Electrical Specifications Nominal VB = +12V, VA = +5V, T_A = T_J = -40^oC - 85^oC, Unless Otherwise Specified (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
UNIT
MIN TYP MAX S
CTIM PARAMETERS
C_TIM Charging Current
C_TIM Fault Pull-Up Current
Current Limit Time-Out Threshold Voltage
+5V AUXILIARY SUPPLY CONTROL
VA Integrated Switch On Resistance
Disabled Output Voltage
V_OUT Rising Rate
Slow V_OUT turn-off rate
Fast V_OUT turn-off rate
CURRENT CONTROL
C_TIM_ichg0
C_TIM_ichg6
C_TIM_Vth
V_CTIM = 0V
V_CTIM = 6V
CTIM Voltage
r_DS(ON)
V_{OUT_DIS}
t_vout_rt
Toff_svout
Toff_fvout
V_IN = 5V, I_OUT = 0.4A, T_A = T_J = 25^oC
T_A = T_J = 85^oC
V_IN = 5V, Switch Disabled, No Load
R_L = 10Ω, C_L = 0.1µF, 10%-90%
R_L = 10Ω, C_L = 0.1µF, 90%-10%
R_L = 10Ω, C_L = 0.1µF, 90%-10%
16
20 23 µA
5
8
11 mA
1.3
1.8 2.3 V
-
0.125 0.150 Ω
-
0.160 0.200 Ω
-
300 450 mV
-
8
- V/mS
-
8
- V/mS
-
4
- V/uS
Current Limit
Ilim
0.75
1 1.25 A
OC Regulation Settling Time
Severe OC Regulation Settling Time
Over Current Latch-off Time
I/O PARAMETERS
Tsett_ocr
Tsett_socr
t_{OC_loff}
R_L= 5Ω, C_L= 0.1µF to Within 10% of CR
R_L< 1Ω, C_L= 0.1µF to Within 10% of CR
-
1.5
-
ms
-
100
-
µs
-
12
ms
Fault Output Voltage
ENABLE High Threshold
ENABLE Low Threshold
ENABLE Input Current
BIAS PARAMETERS
Enabled VA_Iin Current
Disabled VA_Iin Current
Undervoltage Lockout Threshold
UV Hysteresis
Vfault_hi
Ven_vih
Ven_vil
Ien_i
I_OUT = 10mA
V_IN = 5.5V
V_IN = 4.5V
ENABLE = 0V to 5V, V_IN = 5V, T_J > 25^oC
I_{en_VA}
I_{dis_VA}
V_UVLO
UV_HYS
Switches Closed, VA_Out = OPEN, T_J >0^oC
Switches Open, VA_Out = OPEN
VIN Rising, Switch Enabled
-
-
0.3 V
2.0
-
-
V
-
-
0.8 V
-0.5
-
0.5 µA
-
120 200 µA
-
1
5 µA
1.7
2.25 2.5 V
50
100 - mV
ISL6160 Description and Operation
The ISL6160 is the first power supply sequencer for the
emerging InfiniBand module (IM) hot swap application. This IC
controls both the +12V VB(ulk) and +5V VA(ux) supplies
providing soft start during hot insertion and overcurrent (OC)
protection during operation.
For VB control and protection, the ISL6160 features include an
accurate current detecting comparator, current limiting for the
range of both 25W and 50W capable power ports, a current
regulated time delay to latch off and soft start turn-on ramp.
These features are all programmable with a minimum of
external passive components. The ISL6160 also includes
severe overcurrent protection that immediately shuts down the
MOSFET switch should there be a shorted IM load.
The VB_ON pin provides on-off control of the external VB
switch once VB_IN > 9V. Driving this pin high causes the gate
pin to charge the external gate capacitor with a 10uA current
setting the soft start ramp rate. Large capacitive loads can thus
be safely turned on with no inrush current spiking nor disruption
of the voltage supply rail.
The VB load current passes through an external current sense
resistor. When the voltage across the sense resistor exceeds
the user programmed ISET voltage threshold, the controller
enters current regulation (CR). The regulated current level is
fixed by the R_ISET and R_SENSE resistors. See Table 1 for
R_ISET programming resistor value and the resulting nominal
CR threshold voltage.
TABLE 1.
R_ISET
RESISTOR
NOMINAL
OC Vth
NOMINAL REGULATION LEVEL
(R_SENSE = 0.020Ω)
CURRENT (A) POWER (W)
1.0kΩ
20mV
1
12
2.8kΩ
56mV
2.8
33.6
3.48kΩ
70mV
3.5
42
5.6kΩ
112mV
5.6
67.2
NOTE: Nominal Vth = R_ISET x 20µA.
During CR, the CTIM pin starts charging the time-out capacitor
with a 20µA current source and the controller enters the delay
time to latch-off period. This feature allows transient currents
that exceed the designed limit to pass without immediately
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