ETC IRU1011-33CH

Data Sheet No.PD94544
IRU1011-33
1.3A LOW DROPOUT POSITIVE FIXED REGULATOR
PRELIMINARY DATA SHEET
FEATURES
DESCRIPTION
Stable with Ceramic Capacitor
Guaranteed < 1.3V Dropout at Full Load Current
Fast Transient Response
Output Current Limiting
Built-In Thermal Shutdown
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
NC
Gnd
6
IRU1011-33
5V
2
NC
NC
5
3
VIN
VOUT
4
C1
4.7uF
X5R
3.3V
C2
4.7uF
X5R
Figure 1 - Typical application of IRU1011-33.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 150
Rev. 1.0
09/06/02
6-Pin MLPM 3x3 (H)
IRU1011-33CH
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MLPM Marking
CM33
1
IRU1011-33
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V IN) .................................................... 10V
Operating Junction Temperature Range .....................
0°C To 150°C
Operating Ambient Temperature Range ..................... -40°C To 125°C
Storage Temperature Range ...................................... -65°C To 150°C
PACKAGE INFORMATION
6-PIN MLPM 3x3 (H)
NC
1
6
Gnd
NC
2
5
NC
VIN
3
4
VOUT
uJA=328C/W
For 1" Square Pad
Exposed Pad on
underside is connected to Gnd
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over VIN=4.5V to 7V, IOUT=2mA to 1.3A, CIN=COUT=4.7mF
and 08C<TJ<1508C.
PARAMETER
Output Voltage 3.3V
SYM
V O(3.3)
Line Regulation
RegLINE
Load Regulation
RegLOAD
Dropout Voltage DVOUT= -1%
VD
Current Limit
IS
Minimum Output Current
IO(MIN)
Temperature Stability
TS
RMS Output Noise
VN
Ripple Rejection (VIN to Output)
RA
Thermal Shutdown
TJ(SD)
Quiescent Current
IGND
Transient Response
DV OUT
Change of VOUT with Step Load DIOUT
Change
Transient Response
DV OUT
Change of VOUT with
DV IN
Application of VIN
Transient Response
DV OUT
Short Circuit Removal
DIOUT
Response
@IO=Short
2
TEST CONDITION
4.75V<VIN<5.25V, 5mA[IO[1.3A:
TJ=258C
08C[TJ[1508C
4.75V<VIN<5.25V, IO=10mA
VIN=4.75V, 10mA[IO[1.3A
IO=1.3A
VIN=5.5V
Note 3, 5
Note 4, 5
TJ=258C, 10Hz<BW<10KHz, Note 5
VIN=5V, Note 5, f=120Hz
4.75V<VIN<5.25V, 0mA[IO[1.3A,
Note 5
VIN[7V, 2mA[IO[1.3A
VIN=5V, 0mA[IO[50mA, TJ=258C
VIN=5V, 10mA<IO<1.3A, tr/1ms
VIN=5V, 1.3A to 10mA, tf/1ms
CIN=CO=10mF, X7R & Note 5
0 to 5V step input, tr/1ms,
1mA[IO[1.3A, CIN=CO=10mF, X7R,
Note 5
VIN=5V, Short[IO[10mA,
CIN=CO=10mF, X7R, Note 5
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MIN
3.234
3.2175
1.3
60
150
TYP
MAX
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
UNITS
V
mV
mV
V
A
mA
%
%Vo
dB
8C
4.3
<4.2
5
5
5
mA
610
610
%
1
610
%
1
620
%
Rev. 1.0
09/06/02
IRU1011-33
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 #
PIN SYMBOL
PIN DESCRIPTION
1,2,5
NC
No connection.
3
VIN
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.
4
VOUT
The output of the regulator. A minimum of output capacitance must be connected from
this pin to ground to insure stability.
6
Gnd
This pin is connected with ground. It is also the tab of the package.
BLOCK DIAGRAM
VIN 3
4 VOUT
+
CURRENT
LIMIT
1.25V
THERMAL
SHUTDOWN
+
6 Gnd
Figure 2 - Simplified block diagram of the IRU1011-33.
Rev. 1.0
09/06/02
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3
IRU1011-33
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 1508C, 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
4.7mF and a minimum output capacitance 4.7mF Ceramic capacitor is needed for regulator stage as well as
the specified minimum loads to guarantee stability.
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 1508C, 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 3 (V IN - VOUT)
PD = 1 3 (5 - 3.3) = 1.7W
For MLPM package, we have:
RTHJA = 328C/W
TA = 458C
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.
DT = PD3RTHJA = 1.7332 = 54.4
TJ = TA+DT = 99.48C
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.
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
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Rev. 1.0
09/06/02
IRU1011-33
(H) MLPM Package
6-Pin
D
e
D/2
b
L
R
E/2
L3
L4
EXPOSED PAD
(OPTIONAL)
E
PIN 1
MARK AREA
(SEE NOTE 1)
PIN NO. 1
L2
TOP VIEW
L1
D2
BOTTOM VIEW
L2
E2
NOTE 2
PIN NO. 1
S
A2
A
Note 2: If L1 Max is not called out, the metalized feature will extend to the exposed pad.
Thus L4 does not apply.
A3
SIDE VIEW
A1
SYMBOL
DESIG
A
A1
A2
A3
b
D
D2
E
E2
e
L
L1
L2
L3
L4
R
S
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.
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
08
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
108
128
NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS.
Rev. 1.0
09/06/02
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5
IRU1011-33
PACKAGE SHIPMENT METHOD
PKG
DESIG
H
PACKAGE
DESCRIPTION
PIN
COUNT
PARTS
PER TUBE
PARTS
PER REEL
T&R
Orientation
6
---
3000
Fig A
MLPM 3x3
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. 02/01
6
www.irf.com
Rev. 1.0
09/06/02