ISL6160CB-T【PDF 5/11 页】IC CTRLR BULK/AUXILIARY 14-SOIC

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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

ISET

programming resistor value and the resulting nominal

CR threshold voltage.

During CR, the CTIM pin starts charging the time-out capacitor

with a 20礎 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

CTIM PARAMETERS

TIM

Charging Current

TIM

_ichg0 V

CTIM

= 0V

礎

TIM

Fault Pull-Up Current

TIM

_ichg6 V

CTIM

= 6V

Current Limit Time-Out Threshold Voltage

TIM

_Vth CTIM Voltage

1.3

1.8

2.3

+5V AUXILIARY SUPPLY CONTROL

VA Integrated Switch On Resistance

DS(ON)

= 5V, I

OUT

= 0.4A, T

= T

= 25

0.125 0.150

= T

= 85

0.160 0.200

Disabled Output Voltage

OUT_DIS

= 5V, Switch Disabled, No Load

300

450

OUT

Rising Rate

t_vout_rt

= 10&, C

= 0.1礔, 10%-90%

V/mS

Slow V

OUT

turn-off rate

Toff_svout R

= 10&, C

= 0.1礔, 90%-10%

V/mS

Fast V

OUT

turn-off rate

Toff_fvout

= 10&, C

= 0.1礔, 90%-10%

V/uS

CURRENT CONTROL

Current Limit

Ilim

0.75

1.25

OC Regulation Settling Time

Tsett_ocr

= 5&, C

= 0.1礔 to Within 10% of CR

1.5

Severe OC Regulation Settling Time

Tsett_socr R

< 1&, C

= 0.1礔 to Within 10% of CR

100

祍

Over Current Latch-off Time

OC_loff

I/O PARAMETERS

Fault Output Voltage

Vfault_hi

OUT

= 10mA

0.3

ENABLE High Threshold

Ven_vih

= 5.5V

2.0

ENABLE Low Threshold

Ven_vil

= 4.5V

0.8

ENABLE Input Current

Ien_i

ENABLE = 0V to 5V, V

= 5V, T

> 25

-0.5

0.5

礎

BIAS PARAMETERS

Enabled VA_Iin Current

en_VA

Switches Closed, VA_Out = OPEN, T

120

200

礎

Disabled VA_Iin Current

dis_VA

Switches Open, VA_Out = OPEN

礎

Undervoltage Lockout Threshold

UVLO

VIN Rising, Switch Enabled

1.7

2.25

2.5

UV Hysteresis

HYS

100

Electrical Specifications Nominal VB = +12V, VA = +5V, T

= T

= -40

C - 85

C, Unless Otherwise Specified (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP MAX

UNIT

TABLE 1.

NOMINAL REGULATION LEVEL

SENSE

= 0.020&)

ISET

RESISTOR

NOMINAL

OC Vth

CURRENT (A)

POWER (W)

1.0k&

20mV

2.8k&

56mV

2.8

33.6

3.48k&

70mV

3.5

5.6k&

112mV

5.6

67.2

NOTE: Nominal Vth = R

ISET

x 20礎.

ISL6160

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