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IRU1205 IRU1205-18 / IRU1205-25 / IRU1205-28 IRU1205-30 / IRU1205-33 / IRU1205-36
Data Sheet No. PD94133
FEATURES
SOT-23 Package Stable with 2.2mF Ceramic Capacitor 1% Voltage Reference Accuracy Only 270mV Dropout at 300mA and 170mV Dropout at 150mA 5mA Quiescent Current in Shutdown Current Limit and Thermal Shutdown Logic Input Enable Pin
300mA ULTRA LOW DROPOUT POSITIVE ADJUSTABLE AND FIXED REGULATORS DESCRIPTION
The IRU1205 device is an efficient linear voltage regulator with better than 1% initial voltage accuracy, very low dropout voltage and very low ground current designed especially for hand held, battery powered applications. Other features of the device are: TTL compatible enable/ shutdown control input, current limiting and thermal shutdown. The IRU1205 is available in fixed and adjustable output voltage versions in a small SOT-23 5-Pin package.
APPLICATIONS
Laptop, Notebook & Palmtop computers Battery Powered Equipments PCMCIA Vcc & Vpp Regulator Consumer Electronics High Efficiency Linear Power Supplies
TYPICAL APPLICATION
VIN
C1 2.2uF
1 2
VIN
VOUT
5
R1 C2 2.2uF R2
VOUT
Vo = 1.253 1+
Gnd
(
R1 R2
)
SD
Enable
3
En
Adj
4
Figure 1 - Typical application of the IRU1205 ajustable voltage regulator.
3.3V
C1 2.2uF
1 2
VIN
VOUT
5
C2 2.2uF
2.5V
Gnd
SD
Enable
3
En
CBYP
4
C3 1000pF
Figure 2 - Typical application of the IRU1205-25 fixed voltage regulator.
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
Rev. 2.3 07/16/02
5-PIN SOT-23 (L5) IRU1205CL IRU1205-18CL IRU1205-25CL IRU1205-28CL IRU1205-30CL IRU1205-33CL IRU1205-36CL
SOT-23 MARKING AT00 AT18 AT25 AT28 AT30 AT33 AT36 www.irf.com
OUTPUT VOLTAGE Adj 1.8V 2.5V 2.8V 3.0V 3.3V 3.6V
1
IRU1205 IRU1205-18 / IRU1205-25 / IRU1205-28 IRU1205-30 / IRU1205-33 / IRU1205-36
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) ..................................................... Enable Input Voltage ................................................. Storage Temperature Range ....................................... Operating Junction Temperature Range ...................... 10V 10V -65C To 150C 0C To 150C
PACKAGE INFORMATION
5-PIN SOT-23 (L5)
En Gnd VIN
3 2 1 3
5-PIN SOT-23 (L5)
En Gnd VIN
2 1
AT00
4 5
Adjustable
uJA=2568C/W
4
ATxx
5
Fixed
uJA=2568C/W
Adj
VOUT
CBYP
VOUT
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over C IN=Co=22mF, Io=100mA, VIN(MIN)=2.5V(Adjustable devices) VIN=Vo + 1V(for fixed voltage devices), VOUT=VFB(for adjustable version only), CBYP=470pF(for AT18, AT25, AT28, AT30, AT33 and AT36), VENB=2V and TA=258C. Typical values refer to TA=258C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. PARAMETER Reference Voltage (See Table 1 for typical values) Line Regulation Load Regulation (Note 1) Dropout Voltage (Note 2) SYM Vo DVI DVL DVI(O) TEST CONDITION (Note 4) Vo + 1VGround Current (Note 3)
IQ
Ground Current-SD Activated Current Limit Thermal Regulation Adjust Pin Current Enable Pin Input LO Voltage Enable Pin Input HI Voltage Enable Pin Input LO Current Enable Pin Input HI Current
IQ(SD) ICL DVP IADJ VEN(L) VEN(H)
320
0.005 0.8 0.1 10 13 85 100 170 204 270 324 120 240 420 540 2200 2900 7200 9300 5 420 0.05 0.1
mA
0.8 2 0.01 20
2
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Rev. 2.3 07/16/02
IRU1205 IRU1205-18 / IRU1205-25 / IRU1205-28 IRU1205-30 / IRU1205-33 / IRU1205-36
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 # 1 PIN SYMBOL VIN 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 higher than VOUT by at least the amount of the dropout voltage and some margin in order for the device to regulate properly. 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. A resistor divider from this pin to the VOUT pin and ground sets the output voltage. To minimize the error due to the error amplifier, select the values of the resistor dividers to be less than 10KV. A 470 to 1000pF bypass capacitor connected to this pin reduces the output noise.
2
Gnd
3
En
4
Adj (Adjustable Only)
4
CBYP (Fixed Only) VOUT
5
The output of the regulator. A minimum of 2.2mF with max ESR of 1V capacitor must be connected from this pin to ground to insure stability. Output Voltage 1.25V 1.8V 2.5V 2.8V 3.0V 3.3V 3.6V The output voltage of the adjustable device can be set using: Vo = 1.253 1+
5-PIN SOT-23 IRU1205 IRU1205-18 IRU1205-25 IRU1205-28 IRU1205-30 IRU1205-33 IRU1205-36
(
R1 R2
)
Where: R1 = Resistor connected from output to the Adj pin R2 = Resistor connected from Adj pin to Gnd
Table 1- Nominal output voltage vs. part number.
Rev. 2.3 07/16/02
www.irf.com
3
IRU1205 IRU1205-18 / IRU1205-25 / IRU1205-28 IRU1205-30 / IRU1205-33 / IRU1205-36
BLOCK DIAGRAM
VIN 1 5 VOUT
Adj
4
THERMAL SHUTDOWN
+
1.25V
Gnd 2
Figure 3 - IRU1205 Adjustable output block diagram.
3 En
VIN 1
5 VOUT
CBYP
4
+
THERMAL SHUTDOWN
1.25V
Gnd 2
3 En
Figure 4 - IRU1205-18, IRU1205-25, IRU1205-28, IRU1205-30, IRU1205-33 and IRU1205-36 Fixed output block diagram.
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
4
www.irf.com
Rev. 2.3 07/16/02
IRU1205 IRU1205-18 / IRU1205-25 / IRU1205-28 IRU1205-30 / IRU1205-33 / IRU1205-36
(L5) SOT-23 Package 5-Pin
B e L
E
E1
e1 D
a
C
A2
A
C L
A1
SYMBOL A A1 A2 B C D E E1 e e1 L
a
MIN MAX 0.90 1.45 0.00 0.15 0.90 1.30 0.25 0.50 0.09 0.20 2.80 3.00 2.60 3.00 1.50 1.75 0.95 REF 1.90 REF 0.35 0.55 08 108
NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS.
Rev. 2.3 07/16/02
www.irf.com
5
IRU1205 IRU1205-18 / IRU1205-25 / IRU1205-28 IRU1205-30 / IRU1205-33 / IRU1205-36
PACKAGE SHIPMENT METHOD
PKG DESIG L5 SOT-23 PACKAGE DESCRIPTION PIN COUNT 5 PARTS PER TUBE --PARTS PER REEL 3000 T&R Orientation Fig A
1
1
1
Feed Direction Figure A
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
6
www.irf.com
Rev. 2.3 07/16/02

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