hip1012a Intersil Corporation, hip1012a Datasheet - Page 3

• Manufacturer Part Number: hip1012a
• Description: Dual Power Distribution Controller
• Manufacturer: Intersil Corporation

Pin Descriptions
PIN #
10
11
12
13
14
1
2
3
4
5
6
7
8
9
3V/12VISEN
PWRON1
PWRON2
SYMBOL
3V/12VG
3V/12VS
PGOOD
5VISEN
MODE/
C
R
C
GND
V
5VG
5VS
PUMP
ILIM
TIM
DD
3.3 V/12V Source
3.3V/12V Gate
Chip Supply
Power ON/ Reset
Invokes 3.3V operation
when shorted to V
Power ON/ Reset
5V Gate
5V Source
5V Current Sense
Power Good indicator
Current Limit Timing
Capacitor
Charge Pump
Capacitor
Chip Ground
Current Limit Set
Resistor
3.3V/12V Current Sense
3
FUNCTION
DD
, pin 3.
Connect to source of associated external N-Channel MOSFET switch to sense output
voltage.
Connect to the gate of associated N-Channel MOSFET switch. A capacitor from this node
to ground sets the turn-on ramp. At turn-on this capacitor will be charged to 17.4V by a 10µA
current source when in 5v/12V mode of operation, otherwise capacitor will be charged to
11.4V. A small resistor (10 - 200Ω) should be placed in series with the gate capacitor to
ground to prevent current oscillations.
Connect to 12V supply. This can be either connected directly to the +12V rail supplying the
load voltage or to a dedicated V
V
PWRON1 and PWRON2 are used to turn-on and reset the chip. Both outputs turn-on when
either pin is driven low. After a current limit time out, the chip is reset by the rising edge of a
reset signal applied to either PWRON pin. Each input has 100µA pull up capability which is
compatible with 3V and 5V open drain and standard logic. PWRON1 is also used to invoke
3.3V control operation in preference to +12V control. By tying pin 4 to pin 3 the charge pump
is disabled and the UV threshold also shifts to 2.8V.
Connect to the gate of the external 5V N-Channel MOSFET. A capacitor from this node to
ground sets the turn-on ramp. At turn-on this capacitor will be charged to 11.4V by a 10µA
current source. A small resistor (10 - 200Ω) should be placed in series with the gate
capacitor to ground to prevent current oscillations.
Connect to the source side of 5V external N-Channel MOSFET switch to sense output
voltage.
Connect to the load side of the 5V sense resistor to measure the voltage drop across this
resistor between 5VS and 5VISEN pins.
Indicates that all output voltages are within specification. PGOOD is driven by an open drain
N-Channel MOSFET. It is pulled low when any output is not within specification.
Connect a capacitor from this pin to ground. This capacitor controls the time between the
onset of current limit and chip shutdown (current limit time-out). The duration of current limit
time-out (in seconds) = 200kΩ x C
Connect a 0.1µF capacitor between this pin and V
when in 3.3V control mode.
A resistor connected between this pin and ground determines the current level at which
current limit is activated. This current is determined by the ratio of the R
sense resistor (R
R
Connect to the load side of sense resistor to measure the voltage drop across this resistor.
DD
SENSE
decoupling must be paid.
).
HIP1012A
SENSE
). The current at current limit onset is equal to 10µA x (R
DD
TIM
+12V supply. If the former is chosen special attention to
DESCRIPTION
(Farads).
DD
(pin3). Directly connect this pin to V
ILIM
resistor to the
ILIM
/
DD