5

HIP1012 Description and Operation

The HIP1012 is a multi featured dual power supply

distribution controller, including programmable current

limiting regulation and time to latch off. Additionally the

HIP1012 operates both as a +3.3V and 5V or a +5V and

+12V power supply controller with each mode having

appropriate Under Voltage (UV) fault notification levels.

Upon initial power up HIP1012 can either isolate the

voltage supply from the load by holding the external

N-Channel MOSFET switches off or apply the supply rail

voltage directly to the load for true hot swap capability. In

either case the HIP1012 turns on in a soft start mode

protecting the supply rail from sudden current loading. If

either PWRON pin is pulled low the HIP1012 will be in true

hot swap mode. Both PWRON pins must be high to turn off

the HIP1012 thus isolating the power supply from the load

through the external FETs.

At turn-on, the gate capacitor of each external N-Channel

MOSFET is charged with a 10

µA current source. These

capacitors create a programmable ramp (soft turn-on). A

charge pump supplies the gate drive for the 12V supply

switch driving that gate to 17V.

The load currents pass through two external current sense

resistors. When the voltage across either resistor exceeds

the user programmed Over Current (OC) voltage threshold

value, (see Table 1) the controller enters current regulation.

a10

µA current source and the controller enters the time out

period. The length of the time out period is set by the single

(pin 10) to ground and is characterized by a lowered gate

drive voltage to the appropriate external N-Channel

is tripped resulting in both N-Channel MOSFETs being

latched off.

Gate Turn-On Time

5

-

ms

Gate Turn-On Current

8

10

12

µA

3X Gate Discharge Current

3XdisI

0.5

0.75

-

A

5V Under Voltage Threshold

4.35

4.5

4.65

V

3.3V Under Voltage Threshold

2.65

2.8

2.95

V

3.3/5VG High Voltage

3/5VG

11.2

11.9

-

V

SUPPLY CURRENT AND IO SPECIFICATIONS

4

8

10

mA

9.5

10.0

10.7

V

9.3

9.8

10.3

V

Current Limit Time-Out

162024

ms

PWRON Pull-up Voltage

PWRN_V

PWRON pin open

1.8

2.4

3.2

V

PWRON Rising Threshold

PWR_Vth

1.1

1.5

2

V

PWRON Hysteresis

PWR_hys

0.1

0.2

0.3

V

PWRON Pull-Up Current

PWRN_I

60

80

100

µA

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

Charge Pump Output Current

Qpmp_Io

320

560

800

µA

Charge Pump Output Voltage

Qpmp_Vo

No load

17.2

17.4

-

V

Charge Pump Output Voltage - Loaded

Qpmp_VIo

Load current = 100

µA

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

Electrical Specifications

Unless Otherwise Specified (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

HIP1012, HIP1012A