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Data Sheet No.PD94544 revA
IRU1011-33(PbF)
1.3A LOW DROPOUT POSITIVE FIXED REGULATOR FEATURES
Stable with Ceramic Capacitor Guaranteed < 1.3V Dropout at Full Load Current Fast Transient Response Output Current Limiting Built-In Thermal Shutdown
DESCRIPTION
The IRU1011-33 is a fixed linear regulator and it is capable of supplying 1.3A of continuous current over line and temperature range. The IRU1011-33 is stable with low value ceramic capacitors, allowing designers flexibility in external component selection. The output is protected by both current limit and thermal shutdown.
APPLICATIONS
High Efficiency Linear Regulator Hard Disk Drivers, CD-ROMs, DVDs ADSL and Cable Modems
TYPICAL APPLICATION
1 2
NC NC VIN
Gnd NC VOUT
6 5 4
IRU1011-33
5V
3
3.3V C2 4.7uF X5R
C1 4.7uF X5R
Figure 1 - Typical application of IRU1011-33.
PACKAGE, SHIPMENT and ORDER INFORMATION
PKG PACKAGE PIN DESIGN DESCRIPTION COUNT H IRU1011-33CH 6 H IRU1011-33CH(PbF) 6 PARTS PER TUBE ----3000 PARTS PER REEL -----3000 T&R
Oriantation
n/a Fig A
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IRU1011-33(PbF)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 10V Operating Junction Temperature Range ..................... 0C To 150C Operating Ambient Temperature Range ..................... -40C To 125C Storage Temperature Range ...................................... -65C To 150C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device.
PACKAGE INFORMATION
6-PIN MLPM 3x3 (H) JA=32 C/W For 1" Square Pad Exposed Pad on underside is connected to Gnd
NC NC VIN
1 2 3
6 5 4
Gnd NC VOUT
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over VIN=4.5V to 7V, IOUT=2mA to 1.3A, CIN=COUT=4.7F and 0 CVO(3.3)
Line Regulation Load Regulation Dropout Voltage VOUT= -1% Current Limit Minimum Output Current Temperature Stability RMS Output Noise Ripple Rejection (VIN to Output) Thermal Shutdown Quiescent Current Transient Response Change of VOUT with Step Load Change Transient Response Change of VOUT with Application of VIN Transient Response Short Circuit Removal Response
RegLINE RegLOAD VD IS IO(MIN) TS VN RA TJ(SD) IGND VOUT IOUT VOUT VIN VOUT IOUT
@IO=Short
TEST CONDITION 4.75VMIN 3.234 3.2175
TYP
MAX
UNITS V mV mV V A mA % %Vo dB C mA %
1.3
60 150
3.3 3.366 3.3 3.3825 5 15 8 12 1.1 1.3 1.9 0 2 1.5 0.003 65 155 4.3 <4.2 5 5 1 5.4 10 10 10
%
1
20
%
2
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IRU1011-33(PbF)
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: Minimum load current is defined as the minimum current required at the output in order for the output voltage to maintain regulation. Note 4: Temperature stability is the change in output from nominal over the operating temperature range. Note 5: Guaranteed by design, but not tested in production.
PIN DESCRIPTIONS
PIN # 1,2,5 3 PIN SYMBOL NC VIN PIN DESCRIPTION No connection. The power input pin of the regulator. A minimum of input capacitance must be connected from this pin to ground to insure that the input voltage does not sag below the minimum dropout voltage during the load transient response. This pin must always be higher than the VOUT pin by the amount of dropout voltage (see electrical specification) in order for the device to regulate properly. The output of the regulator. A minimum of output capacitance must be connected from this pin to ground to insure stability. This pin is connected with ground. It is also the tab of the package.
4 6
VOUT Gnd
BLOCK DIAGRAM
VIN 3 4 VOUT
+
CURRENT LIMIT THERMAL SHUTDOWN 1.25V
+
6 Gnd
Figure 2 - Simplified block diagram of the IRU1011-33.
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IRU1011-33(PbF)
APPLICATION INFORMATION
Introduction The IRU1011-33 regulator is a 3-terminal device offered in a fixed output of 3.3V and it is designed specifically to provide an extremely low dropout voltage. The IRU1011-33 is designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer number of output capacitors. Thermal Protection When the junction temperature exceeds 150 C, the internal thermal protection shuts the IRU1011-33 down. Current Limit Protection The IRU1011-33 provides Over Current Protection when the output current exceeds typically 2A. The output decreases to limit the power dissipation. Stability The IRU1011-33 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. A minimum input capacitance of 4.7F and a minimum output capacitance 4.7F Ceramic capacitor is needed for regulator stage as well as the specified minimum loads to guarantee stability. Transient Response and PSRR The input and output capacitors are critical in order to ensure good transient response and PSRR. The most important aspects of this are capacitor selection, placement and trace routing. Place each capacitor as close as physically possible to its corresponding regulator pin. Use wide traces for a low inductance path. Couple directly to the ground and power planes as possible. The use of low ESR capacitors is crucial to achieving good results. Larger capacitance and lower ESR will improve both PSRR and transient response. Thermal Design The IRU1011-33 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Although this device can operate with junction temperatures in the range of 150 C, it is recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction temperature is kept below this number. The example below shows the steps in selecting the proper surface mount package. Assuming, the following conditions: VOUT = 3.3V VIN = 5V IOUT = 1A (DC Avg) Calculate the maximum power dissipation using the following equation: PD = IOUT x (VIN - VOUT) PD = 1 x (5 - 3.3) = 1.7W For MLPM package, we have: RTHJA = 32 C/W TA = 45 C T = PDxRTHJA = 1.7x32 = 54.4 TJ = TA+T = 99.4 C Layout Consideration The IRU1011-33, like many other high-speed regulators, requires that the output capacitors be close to the device for stability. For power consideration, a ground plane pad of approximately one-inch square on the component side must be dedicated to the device where all Gnd pins are connected to dissipate the power. If a multilayer board is used, it is recommended that the inner layers of the board are also dedicated to the size of the pad for better thermal characteristics.
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IRU1011-33(PbF)
(H) MLPM Package 6-Pin
D/2
D
e
b
L
E/2 L3 E
PIN 1 MARK AREA (SEE NOTE 1)
R L4
EXPOSED PAD (OPTIONAL)
E2
L2
L1
D2
NOTE 2
PIN NO. 1
TOP VIEW S
L2
BOTTOM VIEW
PIN NO. 1
A2 A3 SIDE VIEW A1
SYMBOL DESIG A A1 A2 A3 b D D2 E E2 e L L1 L2 L3 L4 R S
A
Note 1: Details of pin #1 are optional, but must be located within the zone indicated. The identifier may be molded, marked or metalized features. Note 2: If L1 Max is not called out, the metalized feature will extend to the exposed pad. Thus L4 does not apply.
6-PIN 3x3
MIN 0.80 0.00 0.65 0.15 0.33 1.92 1.11 0.20 0.16 --0.17 0.17 0 NOM MAX 0.90 1.00 0.025 0.05 0.70 0.75 0.20 0.25 0.35 0.43 3.00 BSC 2.02 2.12 3.00 BSC 1.21 1.31 0.95 0.29 0.45 0.24 0.40 --0.125 --0.30 ----0.127 REF 10 12
NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. www.irf.com
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IRU1011-33(PbF)
1
1
1
Feed Direction Figure A - Live Bug
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. 8/29/2005
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