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Data Sheet No. PD94134
IRU1206 / IRU1207 / IRU1208 / IRU1209
1A VERY LOW DROPOUT POSITIVE FIXED AND ADJUSTABLE REGULATORS 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.
FEATURES
Low Dropout Voltage (500mV at 1A) 1% Voltage Reference Accuracy Low Ground Current 1mA 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
3
C2
VOUT
IRU1206XX Gnd 2
VIN
1
VIN
C1
Figure 1 - Typical application of the 1206-XX in a 3-Pin SOT-223 package.
PACKAGE ORDER INFORMATION
TJ (C) 0 To 125 0 To 125 0 To 125 0 To 125 0 To 125 0 To 125 0 To 125 0 To 125
Rev. 2.1 04/09/02
2-PIN TO-252 3-PIN (D-PAK) SOT-223 (Y) IRU1206-18CD IRU1206-18CY IRU1206-25CD IRU1206-25CY IRU1206-33CD IRU1206-33CY NA NA NA NA NA NA NA NA NA NA
8-PIN PLASTIC SOIC (S) NA NA NA IRU1207-18CS IRU1207-25CS IRU1207-33CS IRU1208CS IRU1209CS www.irf.com
VOLTAGE 1.8V 2.5V 3.3V 1.8V 2.5V 3.3V Adj Adj
PIN FUNCTIONS VIN, VOUT, Gnd VIN, VOUT, Gnd VIN, VOUT, Gnd VIN, VOUT, Gnd, Enable, Flag VIN, VOUT, Gnd, Enable, Flag VIN, VOUT, Gnd, Enable, Flag VIN, VOUT, Gnd, Flag, Adj VIN, VOUT, Gnd, Enable, Adj
1
IRU1206 / IRU1207 / IRU1208 / IRU1209
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 12V Enable Input Voltage ................................................ 12V Storage Temperature Range ...................................... -65C To 150C Operating Junction Temperature Range ..................... 0C To 135C
PACKAGE INFORMATION
2-PIN PLASTIC TO-252 (D-Pak) IRU1206
FRONT VIEW 3
3-PIN PLASTIC SOT-223 (Y) IRU1206
TOP VIEW 3
VOUT
VOUT Gnd VIN
Tab is Gnd
1
VIN
JA=70C/W for 0.5" Sq pad 8-PIN PLASTIC SOIC (S) IRU1208
TOP VIEW
Tab is Gnd
2 1
JA=90C/W for 0.4" Sq pad
IRU1207
TOP VIEW
IRU1209
TOP VIEW
Enable VIN VOUT Flag
1 2 3 4
8 7 6 5
Gnd Gnd Gnd Gnd
Flag
1 2 3 4
8 7 6 5
Gnd Gnd Gnd Gnd
Enable
1 2 3 4
8 7 6 5
Gnd Gnd Gnd Gnd
JA=55C/W for 1" Sq pad
VIN VOUT Adj
JA=55C/W for 1" Sq pad
VIN VOUT Adj
JA=55C/W for 1" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=COUT=10mF, VIN=Vo+1V, VOUT=VFB (For adjustable version only), and TA=25C. Typical values refer to TA=25C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. PARAMETER SYM Initial Voltage Accuracy Vo See Table 1 for nominal values Line Regulation DVI Load Regulation (Note 1) DVL Output Voltage Temp Coef. Dropout Voltage (Note 2) DVO(T) DVI(O) TEST CONDITION Io=10mA, TA=258C (Note 4) Vo + 1V0.5 0.5 20 100 300 500
Ground Current (Note 3)
IQ
mA
Current Limit Minimum Input Voltage IRU1208, IRU1209 Adjust Pin Current Minimum Load Current
ICL VIN(min) IADJ IO(min)
A V mA mA
VIN=2.5V, Vo=VADJ (Note 4)
2
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Rev. 2.1 04/09/02
IRU1206 / IRU1207 / IRU1208 / IRU1209
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 SYM IQ(SD) VEN(L) VEN(L) TEST CONDITION Enable=Open Regulator OFF (Note 4) Regulator ON (Note 4) VEN(L)=0V to 0.8V (Note 4) VEN(L)=2V to Vin (Note 4) MIN TYP 0.01 MAX 1 0.8 2 600 UNITS mA V V mA mA %Vo %Vo mV m
2 0.1 100 3.8 0.8 400 230
VTH(FG) VHYS Output Ramping Up VF(SAT) Io=5mA Io=500mA
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 VIN and VOUT required to maintain regulation at VOUT. It is measured when the output voltage drops 1% below its nominal value.
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 +1258C.
PIN DESCRIPTIONS
PIN DESCRIPTION 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. VOUT The output of the regulator. A minimum of 2.2mF capacitor must be connected from this pin (All devices) to ground. Gnd Ground pin. This pin must be connected to the lowest potential in the system and all other (All devices) pins must be at higher potential with respect to this pin. Enable Enable pin. A low signal or left open on this pin shuts down the output. This pin must be tied (IRU1207, IRU1209) HI or to VIN for normal operation. Flag An open collector output that switches low when the output voltage drops about 4% below (IRU1207, IRU1208) its expected regulated voltage. Adj A resistor divider from this pin to the VOUT pin and ground sets the output voltage. (IRU1208, IRU1209) PIN SYMBOL VIN (All devices)
APPLICATION INFORMATION
Part Number 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 2.2mF capacitance and the ESR in the range of 0.5 to 2V insures the stability of the system. IRU1206-18 IRU1206-25 IRU1206-33 IRU1207-18 IRU1207-25 IRU1207-33 IRU1208 IRU1209 Output Voltage 1.8V 2.5V 3.3V 1.8V 2.5V 3.3V 1.24V 1.24V
Table 1 - Output voltage vs. part number.
Rev. 2.1 04/09/02
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3
IRU1206 / IRU1207 / IRU1208 / IRU1209
TYPICAL APPLICATION
VOUT
3
C2
VOUT
IRU1206XX Gnd 2
VIN
1
VIN
C1 Note: Tab must also be connected to ground.
Figure 2 - Typical application of IRU1206. Ref Desig C1 C2 Description Capacitor Capacitor Qty 1 1 Part # 10mF, Tantalum 10mF, Tantalum Manuf AVX AVX
5 6 7 8
Gnd
Flag
4 3
R1
Error Flag VOUT
C2
Gnd
VOUT
IRU1207
Gnd VIN
2 1
Gnd
Enable
SD
Enable
VIN
C1
Figure 3 - Typical application of IRU1207. Ref Desig C1 C2 R1 Description Capacitor Capacitor Resistor Qty 1 1 1 Part # 10mF, Tantalum 10mF, Tantalum 10KV, 5% Manuf AVX AVX Panasonic
4
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Rev. 2.1 04/09/02
IRU1206 / IRU1207 / IRU1208 / IRU1209
TYPICAL APPLICATION
5 6 7 8
Gnd Adj
4 3 2
R2
Gnd
VOUT
VOUT
R1 C2 R3
IRU1208
Gnd VIN
Gnd
Flag
1
Error Flag VIN
C1
R1 Vo = 1.24 3 1 + R2
(
)
Figure 4 - Typical application of IRU1208 in 3.3V to 2.5V regulator. Ref Desig C1 C2 R1 R2 R3 Description Capacitor Capacitor Resistor Resistor Resistor Qty 1 1 1 1 1 Part # 10mF, Tantalum 10mF, Tantalum 127V, 1% 124V, 1% 10KV, 5% Manuf AVX AVX
Rev. 2.1 04/09/02
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5
IRU1206 / IRU1207 / IRU1208 / IRU1209
TYPICAL APPLICATION
5 6 7 8
Gnd Adj
4 3 2
R2
Gnd
VOUT
VOUT
R1 C2
IRU1209
Gnd VIN
Gnd
Enable
1
SD
Enable
VIN
C1
R1 Vo = 1.24 3 1 + R2
(
)
Figure 5 - Typical application of IRU1209 in 3.3V to 2.5V regulator. Ref Desig C1 C2 R1 R2 Description Capacitor Capacitor Resistor Resistor Qty 1 1 1 1 Part # 10mF, Tantalum 10mF, Tantalum 127V, 1% 124V, 1% Manuf AVX AVX
6
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Rev. 2.1 04/09/02
IRU1206 / IRU1207 / IRU1208 / IRU1209
CHARACTERISTICS
IRU1209 Line Regulation @ 5mA to 100mA
Vout Percent Error Vout 1.25 1.245 1.24 1.235 1.23 1.225 1.22 1.215 1.21 1.205 1.2
9V 8V 7V 6V 5V 4V 3V 11 .5 V 10 .5 V 9. 5V 8. 5V 7. 5V 6. 5V 5. 5V 4. 5V 3. 5V 2. 5V 12 V 11 V 10 V 2V
% Error 5.00% 4.50% 4.00% 3.50% 3.00% 2.50% 2.00% 1.50% 1.00% 0.50% 0.00%
Input Voltage
Figure 6
IRU1209 Maximum Output Current ~ 1.25A while in the current limit mode.
IRU1209 Output Voltage in Yellow. A DC offset equal to the output voltage is applied to improve resolution. The output is regulating current in this mode.
Figure 7
5 Sep 2001 15:15:05
Rev. 2.1 04/09/02
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7
IRU1206 / IRU1207 / IRU1208 / IRU1209
CHARACTERISTICS
IRU1209 Voltage Drop-out Variation with Ambient Temperature with various load currents IRU1209 Vout Variation with Ambient Temperature with Vin @ 3.5V and 12V
2.55 2.5 2.4 2.3 2.2 mA 2.1 2.0 1.9 1.8 1.7 1.6 1.5 -50 0 50 8 Temperature ( 8 C) 100 150 100 mA 500 mA 1A 2.54 2.53 2.52 2.51 2.50 2.49 2.48 2.47 2.46 -50 0 50 100 150 3.5 V 12V
Figure 8
Figure 9
IRU1209 Ground Current Variation with Ambient Temperature
100 90 80 70 60 mA 50 40 30 20 10 0
-50 0 50 100 150
Ambient Temperature ( 8 C) 8
Figure 10
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01
8
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Rev. 2.1 04/09/02

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