IRU1206 / IRU1207 / IRU1208 / IRU1209

3

Rev. 2.3

08/02/02

www.irf.com

PIN DESCRIPTIONS

The input pin of the regulator. Typically a large storage capacitor is connected from this pin

to ground to insure that the input voltage does not sag below the minimum drop out voltage

for the device to regulate properly.

The output of the regulator. A minimum of 2.2

mF capacitor must be connected from this pin

to ground.

Ground pin. This pin must be connected to the lowest potential in the system and all other

pins must be at higher potential with respect to this pin.

Enable pin. A low signal or left open on this pin shuts down the output. This pin must be tied

An open collector output that switches low when the output voltage drops about 4% below

its expected regulated voltage.

APPLICATION INFORMATION

Stability

The IRU120X series of regulators require the use of an

output capacitor as part of the frequency compensation

in order to make the regulator stable. A minimum of 2.2

mF

capacitance and the ESR in the range of 0.5 to 2

V in-

sures the stability of the system.

Part Number

Output

Voltage

IRU1206-18

1.8V

IRU1206-25

2.5V

IRU1206-33

3.3V

IRU1207-18

1.8V

IRU1207-25

2.5V

IRU1207-33

3.3V

IRU1208

1.24V

IRU1209

1.24V

Note 1: Low duty cycle pulse testing with Kelvin con-

nections is required in order to maintain accurate data.

Note 2: Dropout voltage is defined as the minimum dif-

voltage drops 1% below its nominal value.

IRU1207, IRU1209

Ground Current - SD Activated

Enable Pin Input LO Voltage

Enable Pin Input HI Voltage

Enable Pin Input LO Current

Enable Pin Input HI Current

IRU1207, IRU1208

Flag Output Threshold Voltage

Flag Output Hysteresis Voltage

Flag Output Saturation Voltage

Note 3: Ground current is the regulator quiescent cur-

rent plus the pass transistor current. The total current

from the supply is the sum of the load current plus the

ground pin current.

Note 4: The specification applies for the junction tem-

perature of 0 to +125

8C.

(All devices)

(All devices)

Gnd

(All devices)

Enable

(IRU1207, IRU1209)

Flag

(IRU1207, IRU1208)

Adj

(IRU1208, IRU1209)

Table 1 - Output voltage vs. part number.

PIN SYMBOL

PIN DESCRIPTION

Enable=Open

Regulator OFF (Note 4)

Regulator ON (Note 4)

Output Ramping Up

Io=5mA

Io=500

mA

PARAMETER

SYM

TEST CONDITION

MIN

TYP

MAX

UNITS

2

0.01

0.1

100

5

0.8

400

230

1

0.8

2

600

mA

V

V

mA

mA

mV