International Rectifier IRU1207-33CS, IRU1207-25CS, IRU1207-18CS, IRU1206-33CY, IRU1206-33CD Datasheet
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Data Sheet No. PD94134
IRU1206 / IRU1207 / IRU1208 / IRU1209
1A VERY LOW DROPOUT POSITIVE
FIXED AND ADJUSTABLE REGULATORS
FEATURES
Low Dropout Voltage (500mV at 1A)
1% Voltage Reference Accuracy
Low Ground Current
1µA Maximum Quiescent Current in Shutdown
(IRU1207, IRU1208)
Fast Transient Response
Current Limit and Thermal Shutdown
Error Flag Signal for Output out of Regulation
(IRU1207, IRU1208)
APPLICATIONS
2.5V Supply from 3.3V Input for the new
generation of Logic ICs
Computer Mother Board, Add-On Cards
High Efficiency Post Regulator in Switch Mode
Power Supply (SMPS)
TYPICAL APPLICATION
Vout
IRU1206-
XX
Gnd
DESCRIPTION
The IRU1206 family of devices are ultra low dropout 1A
regulators using PNP transistor as the pass element.
These products are ideal when a single input supply is
only available and the dropout voltage is less than 1V,
exceeding the minimum dropout characteristics of NPN/
PNP hybrid regulators. One common application of these
regulators is where input is 3.3V and a 2.5V output is
needed.
Besides the low dropout of less than 0.5V, other features of the family of the parts are: micro-power shutdown capability and output UVLO detection where Flag
pin is switched low when output is below 5% of its nominal point.
3
2
C2
Vout
Vin
1
1206app2-1. 0
Vin
C1
Figure 1 - Typical application of the 1206-XX in a 3-Pin SOT-223 package.
PACKAGE ORDER INFORMATION
TJ (°C) 2-PIN TO-252 3-PIN 8-PIN PLASTIC VOLTAGE PIN FUNCTIONS
(D-PAK) SOT-223 (Y) SOIC POWER (S)
0 To 125 IRU1206-18CD IRU1206-18CY NA 1.8V VIN, VOUT, Gnd
0 To 125 IRU1206-25CD IRU1206-25CY NA 2.5V VIN, VOUT, Gnd
0 To 125 IRU1206-33CD IRU1206-33CY NA 3.3V VIN, VOUT, Gnd
0 To 125 NA NA IRU1207-18CS 1.8V VIN, VOUT, Gnd, Enable, Flag
0 To 125 NA NA IRU1207-25CS 2.5V VIN, VOUT, Gnd, Enable, Flag
0 To 125 NA NA IRU1207-33CS 3.3V VIN, VOUT, Gnd, Enable, Flag
0 To 125 NA NA IRU1208CS Adj VIN, VOUT, Gnd, Flag, Adj
0 To 125 NA NA IRU1209CS Adj VIN, VOUT, Gnd, Enable, Adj
Rev. 1.8
09/07/01
1
IRU1206 / IRU1207 / IRU1208 / IRU1209
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 12V
Enable Input Voltage ................................................ 12V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 135°C
PACKAGE INFORMATION
3-PIN PLASTIC TO-252 (D-Pak) 3-PIN PLASTIC SOT-223 (Y)
IRU1206 IRU1206
8-PIN PLASTIC POWER SOIC (S)
IRU1207 IRU1208 IRU1209
TOP VIEW
1
Enable
2
Vin
3
Vout
4
Tab is
Gnd
8
7
6
5
FRONT VIEW
Gnd
Gnd
θJA=55°C/W
Gnd
for 1" Sq pad
GndFlag
3
Vout
θJA=70°C/W for
Vin
0.5" Sq pad
TOP VIEW
1
Flag
2
Vin
3
Vout
4
8
Gnd
7
Gnd
6
Gnd
5
GndAdj
θJA=55°C/W
for 1" Sq pad
1
Tab is
Gnd
TOP VIEW
Enable
Vin
Vou t
3
2
1
TOP VIEW
1
2
3
4
Vout
Gnd
Vin
θJA=90°C/W for
0.4" Sq pad
8
Gnd
7
Gnd
θJA=55°C/W
6
Gnd
5
GndAdj
for 1" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=COUT=10µF, V IN=Vo+1V, VOUT=VFB (For adjustable
version only), and TA=25°C. Typical values refer to TA=25°C. Low duty cycle pulse testing is used which keeps
junction and case temperatures equal to the ambient temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Initial Voltage Accuracy Vo Io=10mA, TA=25"C -1 1 %
See Table 1 for nominal values (Note 4) -1.3 1.3
Line Regulation ∆VI Vo + 1V<VIN<12 0.5 1 %
Load Regulation (Note 1) ∆VL 10mA<Io<1A 0.5 0.7 %
1mA<Io<150mA 0.5 %
Output Voltage Temp Coef. ∆VO(T) 20 100 ppm/"C
Dropout Voltage (Note 2) ∆VI(O) Io=100mA (Note 4) 100 200 mV
Io=500mA (Note 4) 300 400
Io=1000mA (Note 4) 500 650
Ground Current (Note 3) IQ VIN=Vo + 1 for all conditions:
Io=100mA (Note 4) 3 mA
Io=500mA (Note 4) 15
Io=1000mA (Note 4) 50
Current Limit ICL Vo=5% Below Regulation Point 1.1 1.4 A
Minimum Input Voltage VIN(min) 2.1 2.3 V
IRU1208, IRU1209
Adjust Pin Current IADJ VIN=2.5V, Vo=VADJ (Note 4) 0.1 µA
Minimum Load Current IO(min) 1 mA
2
Rev. 1.8
09/07/01
IRU1206 / IRU1207 / IRU1208 / IRU1209
IRU1207, IRU1209 SYM TEST CONDITION MIN TYP MAX UNITS
Ground Current - SD Activated IQ(SD) Enable=Open 0.01 1 µA
Enable Pin Input LO Voltage VEN(L) Regulator OFF (Note 4) 0.8 V
Enable Pin Input HI Voltage VEN(L) Regulator ON (Note 4) 2 V
Enable Pin Input LO Current VEN(L)=0V to 0.8V (Note 4) 0.1 2 µA
Enable Pin Input HI Current VEN(L)=2V to Vin (Note 4) 100 600 µA
IRU1207, IRU1208
Flag Output Threshold Voltage VTH(FG) 3.8 %Vo
Flag Output Hysteresis Voltage VHYS Output Ramping Up 0.8 %Vo
Flag Output Saturation Voltage V
F(SAT) Io=5mA 400 mV
Io=500µA 230 m
Note 1: Low duty cycle pulse testing with Kelvin connections is required in order to maintain accurate data.
Note 2: Dropout voltage is defined as the minimum differential voltage between V
tain regulation at VOUT. It is measured when the output
voltage drops 1% below its nominal value.
IN and VOUT required to main-
PIN DESCRIPTIONS
PIN SYMBOL PIN DESCRIPTION
V
IN
(All devices)
VOUT
(All devices)
Gnd
(All devices)
Enable
(IRU1207, IRU1209)
Flag
(IRU1208)
Adj
(IRU1208, IRU1209)
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
during the load transient response. This pin must always be 0.6V higher than VOUT in order
for the device to regulate properly.
The output of the regulator. A minimum of 2.2µF 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
HI or to VIN for normal operation.
An open collector output that switches low when the output voltage drops about 4% below
its expected regulated voltage.
A resistor divider from this pin to the VOUT pin and ground sets the output voltage.
Note 3: Ground current is the regulator quiescent current 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 temperature of 0 to +125"C.
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 2.2µF
capacitance and the ESR in the range of 0.5 to 2Ω insures the stability of the system.
Rev. 1.8
09/07/01
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
Table 1 - Output voltage vs. part number.
3
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