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IRU1206-18-IRU1206-33-IRU1207-IRU1208-IRU1209
1A VERY LOW DROPOUT POSITIVE FIXED AND ADJUSTABLE REGULATORS
International
TOR Rectifier
FEATU RES
(IRU1207, IRU1208)
(IRU1207, IRU1208)
APPLICATIONS
El 2.5V Supply from 3.3V Input for the new
generation of Logic ICs
Power Supply (SMPS)
Data Sheet No. PD94134
IRU1206 / IRU1207 / IRU1208 / IRU1209
IA VERY LOW DROPOUT POSITIVE
FIXED AND ADJUSTABLE REGULATORS
Low Dropout Voltage (500mV at 1A)
1% Voltage Reference Accuracy
Low Ground Current
lwA Maximum Quiescent Current in Shutdown
Fast Transient Response
Current Limit and Thermal Shutdown
Error Flag Signal for Output out of Regulation
Computer Mother Board, Add-On Cards
High Efficiency Post Regulator in Switch Mode
DESCRIPTION
The IRU1206 family of devices are ultra low dropout IA
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 fea-
tures of the family of the parts are: micro-power shut-
down capability and output UVLO detection where Flag
pin is switched low when output is below 5% of its nomi-
nal point.
TYPICAL APPLICATION
IRU1206-
VOUT E
XX GndZ’l
VIN >—‘F
Figure 1 - Typical application of the 1206-XX in a 3-Pin SOT-223 package.
PACKAGE ORDER INFORMATION
Tu (°C) 2-PIN TO-252 3-PIN 8-PIN PLASTIC VOLTAGE PIN FUNCTIONS
(D-PAK) SOT-223 (Y) SOIC (S)
0 To 125 IRU1206-18CD IRU120tr18CY NA 1.8V VIN, vow, Gnd
0 To 125 IRU1206-25CD IRU1206-25CY NA 2.5V VIN, vom, Gnd
0 To 125 IRU1206-33CD IRU1206-33CY NA 3.3V VIN, vow, Gnd
0 To 125 NA NA IRU1207-18CS 1.8V vm, vow, Gnd, Enable, Flag
0 To 125 NA NA IRU1207-25CS 2.5V Ihro, VouT, Gnd, Enable, Flag
0 To 125 NA NA IRU1207-33CS 3.3V vm, VouT, Gnd, Enable, Flag
0 To 125 NA NA IRU1208CS Adj VIN, N/our, Gnd, Flag, Ad]
0 To 125 NA NA IRU1209CS Ad] VIN, N/our, Gnd, Enable, Ad]
Rev. 2.3
08/02/02
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V IN) .................................................... 12V
Enable Input Voltage ................................................ 12V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 135°C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak) 3-PIN PLASTIC SOT-223 (Y)
IRU1206 IRU1206
FROND" TOP VIEW
3 = VOUT El VOUT
Tab is .
end I eJA=7O°CNv for T22: El and eJA=90c>Clw for
1 :va 0.5" Sq pad INN 0.4" Sq pad
8-PIN PLASTIC SOIC (S)
IRU1207 IRU1208 IRU1209
TOP VIEW TOP VIEW TOP VIEW
EnableE E] Gnd Flag E a Gnd Enable E E] Gnd
vmz zlena - o WE ZIGnd - 0 WE ZIGnd - 0
Wm 7 El Gnd feJA;"55 C/W Vow E El Gnd ferr, CNV WUT E El Gnd f0JA;I5I'35 CNV
Flag E El end or Sq pad Adle El Gnd or Sq pad Adj E El Gnd or Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over (%=CouT=10wF, Vm=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 lo=10mA, TA=25°C -1 1 %
(see Table 1 for nominal values) (Note 4) -1.3 1.3
Line Regulation ANA Vo + 1V
Load Regulation (Note 1) AVL 10mA1mAOutput Voltage Temp Coef. AVom 20 100 ppm/°C
Dropout Voltage (Note 2) AVI(O) lo=100mA (Note 4) 100 200 mV
lo=500mA (Note 4) 300 400
|o=1000mA (Note 4) 500 650
Ground Current (Note 3) lo V|N=VO + 1 for all conditions:
lo=100mA (Note 4) 3 mA
lo=500mA (Note 4) 15
|o=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 Vm=2.5V, V0=VADJ (Note 4) 0.1 wA
Minimum Load Current loam") 1 mA
2 Rev. 2.3
08/02/02
