HIP1012A Просмотр технического описания (PDF) - Renesas Electronics
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HIP1012A Datasheet PDF : 15 Pages
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HIP1012A
Pin Descriptions
PIN # SYMBOL
FUNCTION
DESCRIPTION
1
3V/12VS 3.3 V/12V Source
Connect to source of associated external N-Channel MOSFET switch to sense output
voltage.
2
3V/12VG 3.3V/12V Gate
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 10A
current source when in 5v/12V mode of operation, otherwise capacitor will be charged to
11.4V. A small resistor (10 - 200) should be placed in series with the gate capacitor to
ground to prevent current oscillations.
3
VDD
Chip Supply
Connect to 12V supply. This can be either connected directly to the +12V rail supplying the
load voltage or to a dedicated VDD +12V supply. If the former is chosen special attention to
VDD decoupling must be paid.
4
MODE/
Power ON/ Reset
PWRON1 and PWRON2 are used to turn-on and reset the chip. Both outputs turn-on when
PWRON1 Invokes 3.3V operation
either pin is driven low. After a current limit time out, the chip is reset by the rising edge of a
when shorted to VDD, pin 3. reset signal applied to either PWRON pin. Each input has 100A pull up capability which is
compatible with 3V and 5V open drain and standard logic. PWRON1 is also used to invoke
5
PWRON2 Power ON/ Reset
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.
6
5VG
5V Gate
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 10A
current source. A small resistor (10 - 200) should be placed in series with the gate
capacitor to ground to prevent current oscillations.
7
5VS
5V Source
Connect to the source side of 5V external N-Channel MOSFET switch to sense output
voltage.
8
5VISEN 5V Current Sense
Connect to the load side of the 5V sense resistor to measure the voltage drop across this
resistor between 5VS and 5VISEN pins.
9
PGOOD Power Good indicator
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.
10
CTIM
Current Limit Timing
Connect a capacitor from this pin to ground. This capacitor controls the time between the
Capacitor
onset of current limit and chip shutdown (current limit time-out). The duration of current limit
time-out (in seconds) = 200k x CTIM (Farads).
11
CPUMP
Charge Pump
Capacitor
Connect a 0.1F capacitor between this pin and VDD (pin3). Directly connect this pin to VDD
when in 3.3V control mode.
12
GND
Chip Ground
13
RILIM
Current Limit Set
Resistor
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 RILIM resistor to the
sense resistor (RSENSE). The current at current limit onset is equal to 10A x (RILIM/
RSENSE).
14 3V/12VISEN 3.3V/12V Current Sense Connect to the load side of sense resistor to measure the voltage drop across this resistor.
FN4419 Rev 6.00
March 2004
Page 3 of 15
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