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Data Sheet No. PD94133
IRU1205 / IRU1205-25 / IRU1205-28 IRU1205-30 / IRU1205-33 / IRU1205-36
FEATURES
SOT-23 Package Stable with 2.2F Ceramic Capacitor 1% Voltage Reference Accuracy Only 270mV Dropout at 300mA and 170mV Dropout at 150mA 5A 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 VIN 2 Gnd
VOUT
5
R1 C2 2.2uF R2
VOUT
Vo = 1.242 xo1+ o
R1 p R2
SD
Enable
3
En
Adj
4
Figure 1 - Typical application of the IRU1205 ajustable voltage regulator.
3.3V
C1 2.2uF
1 VIN 2 Gnd 3 En
VOUT
5
C2 2.2uF
2.5V
SD
Enable
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
Rev. 2.0 02/15/02
5-PIN SOT-23 (L5) IRU1205CL IRU1205-25CL IRU1205-28CL IRU1205-30CL IRU1205-33CL IRU1205-36CL
SOT-23 MARKING AT00 AT25 AT28 AT30 AT33 AT36 www.irf.com
OUTPUT VOLTAGE Adj 2.5V 2.8V 3.0V 3.3V 3.6V
1
IRU1205 / 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
5-PIN SOT-23 (L5)
En Gnd VIN
3 2 1
AT00
Adj
4
Adjustable
5
ATxx
CBYP
4
Fixed
5
VOUT
JA=256&C/W
VOUT
JA=256&C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=Co=22F, Io=100A, VIN(MIN)=2.5V(Adjustable devices) VIN=Vo + 1V(for fixed voltage devices), VOUT=VFB(for adjustable version only), CBYP=470pF(for AT25, AT28, AT30, AT33 and AT36), VENB=2V 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 Reference Voltage Vo (See Table 1 for typical values) Line Regulation VI Load Regulation (Note 1) VL Dropout Voltage (Note 2) VI(O) TEST CONDITION (Note 4) Vo + 1VRev. 2.0 02/15/02
mV
Ground Current (Note 3)
IQ
A
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 VP IADJ VEN(L) VEN(H)
320
0.8 2
2
IRU1205 / 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 +125&C.
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 10K. A 470 to 1000pF bypass capacitor connected to this pin reduces the output noise. The output of the regulator. A minimum of 2.2F with max ESR of 1 capacitor must be connected from this pin to ground to insure stability. Output Voltage 1.242V 1.8V 2.5V 2.8V 3.0V 3.3V 3.6V The output voltage of the adjustable device can be set using: Vo = 1.242 xo1+ o R1 p R2
2 3 4
Gnd En Adj (Adjustable Only) CBYP (Fixed Only) VOUT
4 5
5-PIN SOT-23 IRU1205 IRU1205-18 IRU1205-25 IRU1205-28 IRU1205-30 IRU1205-33 IRU1205-36
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. 2.0 02/15/02
www.irf.com
3
IRU1205 / IRU1205-25 / IRU1205-28 IRU1205-30 / IRU1205-33 / IRU1205-36
BLOCK DIAGRAM
VIN 1 5 VOUT
Adj 4
THERMAL SHUTDOWN
+
1.242V
Gnd 2
Figure 3 - IRU1205 Adjustable output block diagram.
3 En
VIN 1
5 VOUT
CBYP 4
1.242V
+
THERMAL SHUTDOWN
Gnd 2
3 En
Figure 4 - 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. 2.0 02/15/02

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