ISL6161 Datasheet, PDF (5/11 Pages) Intersil Corporation – Dual Power Distribution Controller

ISL6161
Electrical Specifications
V_DD = 12V, C_VG = 0.01µF, C_TIM = 0.1µF, R_SENSE = 0.1Ω, C_BULK = 220µF, ESR = 0.5Ω, T_A = T_J = -40°C to
+85°C, Unless Otherwise Specified. Parameters with MIN and/or MAX limits are 100% tested at +25°C,
unless otherwise specified. Temperature limits established by characterization and are not
production tested. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNITS
±1% Current Limit Response Time
(Current within 1% of Regulated Value)
200% Current Overload, R_ILIM = 10kΩ,
R_SHORT = 2.5Ω
-
10
-
µs
Response Time To Dead Short
RT_SHORT C_VG = 0.01µF
-
500
ns
Gate Turn-On Time
t_ON3V C_VG = 0.01µF
-
5
-
ms
Gate Turn-On Current
I_ON3V C_VG = 0.01µF
8
10
12
µA
3x Gate Discharge Current
3xdisI C_VG = 0.01µF, ENABLE = Low
0.75
-
A
3.3V Undervoltage Threshold
3.3V_VUV
2.7
2.85
3.0
V
3.3VG High Voltage
3VG
11.2
11.9
-
V
SUPPLY CURRENT AND IO SPECIFICATIONS
V_DD Supply Current
V_DD POR Rising Threshold
V_DD POR Falling Threshold
Current Limit Time-Out
ENABLE Pull-up Voltage
I_VDD
t_ILIM
C_TIM = 0.1µF
PWRN_V ENABLE pin open
4
8
10
mA
9.5
10.0
10.7
V
9.0
9.4
9.8
V
-
20
-
ms
1.8
2.4
3.2
V
ENABLE Rising Threshold
PWR_Vth
1.1
1.5
2
V
ENABLE Hysteresis
PWR_hys
0.1
0.2
0.3
V
ENABLE Pull-Up Current
PWRN_I
60
80
100
µA
Current Limit Time-Out Threshold (C_TIM)
C_TIM Charging Current
C_TIM Discharge Current
C_TIM Pull-Up Current
R_ILIM Pin Current Source Output
Charge Pump Output Current
Charge Pump Output Voltage
C_TIM_Vth
C_TIM_I
C_TIM_disI
C_TIM_disI
R_ILIM_Io
Qpmp_Io
Qpmp_Vo
V_CTIM = 8V
C_PUMP = 0.1µF, C_PUMP = 16V
No load
1.8
2
2.2
V
8
10
12
µA
1.7
2.6
3.5
mA
3.5
5
6.5
mA
90
100
110
µA
320
560
900
µA
17.2
17.4
-
V
Charge Pump Output Voltage - Loaded
Qpmp_VIo Load current = 100µA
16.2
16.7
-
V
Charge Pump POR Rising Threshold
Qpmp + Vth
15.6
16
16.5
V
Charge Pump POR Falling Threshold
Qpmp - Vth
15.2
15.7
16.2
V
ISL6161 Description and Operation
The ISL6161 is a multi-featured +12V and +3.3V dual power
supply distribution controller. Its features include programmable
current regulation (CR) limiting and time to latch off.
At turn-on, the gate capacitor of each external N-Channel
MOSFET is charged with a 10µA current source. These
capacitors create a programmable ramp (soft turn-on). A
charge pump supplies the gate drive for the 12V supply control
FET switch driving that gate to 17V.
The load currents pass through two external current sense
resistors. When the voltage across either resistor quickly
exceeds the user programmed Current Regulation voltage
threshold (CRVth) level, the controller enters current regulation.
The CRVth is set by the external resistor value on R_ILIM pin. At
this time, the time-out capacitor, C_TIM, starts charging with a
10µA current source and the controller enters the time-out
period. The length of the time-out period is set by the single
external capacitor (see Table 2) placed from the C_TIM pin
(pin 10) to ground and is characterized by a lowered gate drive
voltage to the appropriate external N-Channel MOSFET. Once
C_TIM charges to 2V, an internal comparator is tripped resulting
in both N-Channel MOSFETs being latched off. If the voltage
across the sense resistors rises slowly in response to an OC
condition, then the CR mode is entered at ~95% of the
programmed CR level. This difference is due to the necessary
hysteresis and response time in the CR control circuitry.
Table 1 shows R_SENSE and R_ILIM recommendations and
resulting CR level for the PCI-Express add-in card connector
sizes specified.
5
FN9104.4
October 2, 2008