IR3822 International Rectifier Corp., IR3822 Datasheet - Page 4

• Manufacturer Part Number: IR3822
• Description: Tm Supirbuck Highly Integrated 4a Wide-input Voltage, Synchronous Buck Regulator
• Manufacturer: International Rectifier Corp.

01/08/08
Pins 4, 5 and 15 need to be connected together on system board.
Pin Description
Pin Name
10
11
12
13
14
15
1
2
3
4
5
6
7
8
9
PGood
OCSet
SS/SD
Comp
AGnd
AGnd
PGnd
AGnd
Vsns
V
SW
HG
V
Fb
V
CC
IN
C
PGood sense pin. Use two external resistors to program the power
good threshold.
Inverting input to the error amplifier. This pin is connected directly to the
output of the regulator via resistor divider to set the output voltage and
provide feedback to the error amplifier.
Output of error amplifier.
Signal ground for internal reference and control circuitry.
Signal ground for internal reference and control circuitry.
Soft start / shutdown. This pin provides user programmable soft-start
function. Connect an external capacitor from this pin to signal ground
(AGnd) to set the start up time of the output voltage. The converter can
be shutdown by pulling this pin below 0.3V.
Current limit set point. A resistor from this pin to SW pin will set the
current limit threshold.
This pin provides biasing voltage for the internal blocks of the IC. It also
powers the low side driver. A minimum of 0.1uF, high frequency
capacitor must be connected from this pin to power ground (PGnd).
Power Good status pin. Output is open collector. Connect a pull up
resistor from this pin to Vcc.
Power Ground. This pin serves as a separated ground for the MOSFET
drivers and should be connected to the system’s power ground plane.
Switch node. This pin is connected to the output inductor
Input voltage connection pin
This pin is connected to the high side Mosfet gate. Connect a small
capacitor from this pin to switch node (SW).
This pin powers the high side driver and must be connected to a voltage
higher than input voltage. A minimum of 0.1uF high frequency capacitor
must be connected from this pin to the power ground (PGnd).
Signal ground for internal reference and control circuitry.
Description
IR3822MPBF
PD-60333
4