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Details, datasheet, quote on part number:IRU1120CP
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Datasheet text preview:
Data Sheet No. PD94402
IRU1120
2A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
PRELIMINARY DATA SHEET
FEATURES
Stable with ceramic capacitor Guaranteed < 1.3V Dropout at Full Load Current Fast Transient Response 2% Voltage Reference Initial Accuracy Output Current Limiting Built-In Thermal Shutdown
DESCRIPTION
The IRU1120 is an adjustable linear voltage regulator. It is packaged in a 5-pin ultra thin-pak surface mount package. The adjustable output voltage can be set from 1.25V and up using a simple resistor divider. The input power can be supplied by a single 5V supply. The regulator is capable of supplying 2 Amps of continuous current with an input voltage of 5V. The output is protected by both current limit and thermal shutdown circuits.
APPLICATIONS
High Efficiency Linear Regulator Hard Disk Drivers, CD-ROMs, DVDs ADSL and Cable Modems
TYPICAL APPLICATION
2.5V @ 2A
VADJ 5 VOUT 4 R2 1K R1 1K C3 4.7uF X5R
IRU1120
Gnd 3 VIN 2
VCTRL 1
5V 3.3V
C1 4.7uF X5R C2 4.7uF X5R
Figure 1 - Typical application of IRU1120.
PACKAGE ORDER INFORMATION
TA (°C) 0 To 125 DEVICE IRU1120CP PACKAGE 5-Pin Ultra Thin-Pak TM (P) OUTPUT Adjustable
Rev. 1.3 08/20/02
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1
IRU1120
ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .... Input Voltage (VCTRL) ....... Operating Junction Temperature Range ............ Operating Ambient Temperature Range ............ Storage Temperature Range ..... 10V 10V -40°C To 150°C -40°C To 125°C -65°C To 150°C
PACKAGE INFORMATION
5-Pin Ultra Thin-Pak TM (P)
FRONT VIEW 5 VADJ VOUT Gnd VIN VCTRL
Tab is Gnd
4 3 2 1
uJA=308C/W for 1" Square Pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=CCTRL=COUT=4.7mF. Typical values refer to TJ=258C unless otherwise noted. IFL=2A. VADJ is connected to VOUT and VIN=VCTRL=5V unless otherwise noted. PARAMETER Output Voltage Line Regulation SYM
V OUT RegLINE
Load Regulation
RegLOAD
Dropout Voltage
V DO1
Dropout Voltage
V DO2
Dropout Voltage
V DO3
Dropout Voltage
V DO4
TEST CONDITION Io=10mA, TJ=258C Io=10mA, 08C< TJ<1258C Io=10mA, Vo+1.3VMIN 1.225 1.213
TYP 1.25 1.25 0.5 1.13 1.4 0.2 0.3
MAX 1.275 1.287 0.7 1.25
UNITS V %Vo %Vo
0.4
%Vo
0.48 0.6
0.63
V
0.75 0.94
0.9
V
1.1 1.27 1.05 1.2
1.25
V
1.2
V
2
Rev. 1.3 08/20/02
IRU1120
PARAMETER Dropout Voltage TEST CONDITION Note 2, Io=1.5A, VCTRL=VIN for the following: 08C< TJ<1258C -408C< TJ<1258C Dropout Voltage V DO6 Note 2, Io=2A, VCTRL=VIN for the following: 08C< TJ<1258C -408C< TJ<1258C Current Limit IOL D VO1=10% Below Regulation Minimum Load Current IO(min) Note 3, 5 Thermal Regulation RegTHERM Note 5, 30ms pulse, Io=IFL Ripple Rejection (Vcc to Output) PSRR Note 5, 100HzV DO5
SYM
MIN
TYP 1.2 1.3 1.35 1.44 3 1 0.1 32 0.5 0.3 0.003 1
MAX 1.35
UNITS V
1.5 4 5
V A mA %/W dB %Vo %Vo %Vo mA
2.3
3
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 PIN SYMBOL VCTRL PIN DESCRIPTION The control input pin of the regulator. This pin is connected to the 5V supply to provide base current for the pass transistor of the regulator. This allows the regulator to have very low dropout voltage, enabling use with low values of VIN. A 1mF high frequency capacitor is connected from this pin to VIN to ensure stability. 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 data sheet) in order for the device to regulate properly. This pin is connected with ground. It is also the tab of the package. The output of the regulator. A minimum of output capacitance must be connected from this pin to ground to insure stability. A resistor divider from this pin to the VOUT pin and to ground sets the output voltage. See application section for divider setting recommendations and a circuit example.
2
VIN
3 4 5
Gnd V OUT VADJ
Rev. 1.3 08/20/02
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