ULTRA DROPOUT POSITIVE ADJUSTABLE REGULATOR 0.62V Dropout Fast Tr

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

ULTRA DROPOUT POSITIVE ADJUSTABLE REGULATOR 0.62V Dropout Fast Tr

Datasheet Thumbnail

Top Searches for this datasheet

IRU1160
ULTRA DROPOUT POSITIVE ADJUSTABLE REGULATOR
0.62V Dropout Fast Transient Response Voltage Reference Initial Accuracy Built-in Thermal Shutdown
DESCRIPTION
IRU1160 regulator with extremely dropout voltage using proprietary bipolar process that achieves comparable equivalent resistance that discrete MOSFETs. This product specifically designed provide well regulated supply applications requiring 2.8V lower voltages from 3.3V power supplies where high efficiency switcher achieved without cost complexity associated with switching regulators.
APPLICATIONS
Card Applications On-Board Voltage Regulator Supply such 3.3V 2.8V
TYPICAL APPLICATION
3.3V
100uF
Vctrl
100uF 100uF
IRU1160
Vout Vsense
2.7V
1160app1-1.0
Typical application IRU1160 3.3V 2.8V
(°C)
5-PIN PLASTIC TO-263 IRU1160CM
5-PIN PLASTIC ULTRA THIN-PAK IRU1160CP
Rev. 12/18/00
2-73
IRU1160
ABSOLUTE MAXIMUM RATINGS
Input Voltage Control Input Voltage ctrl) Power Dissipation. Internally Limited Storage Temperature Range -65° 150° Operating Junction Temperature Range 150°
PACKAGE INFORMATION
5-PIN PLASTIC TO-263
FRONT VIEW
5-PIN PLASTIC ULTRA THIN-PAK
FRONT VIEW
Vctrl Vout Vsense
Vctrl Vout Vsense
JA=35°C/W 0.5" square
JA=35°C/W 0.5" square
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over, Cin=µF, Cout =10µF, Tj=0 125° Typical values refer Tj=25° =Vsense. PARAMETER Reference Voltage Vref TEST CONDITION Vctrl=2.75V, Vin=2V, Io=10mA 1.243 Tj=25, Vadj=0V Vctrl=2.7to12V,Vin=2.05V 5.5V, 1.237 Io=10mA Vadj=0V Vctrl=2.5Vto7V, Vin=1.75Vto5.5V, Io=10mA Vadj=0V Vctrl=2.75V, Vin=2.1V, Io=10mA Vadj=0V Vadj=0V conditions below. Vin=2.05V, Io=1.5A Vin=2.05V, Io=5A Vin=2.05V, Io=6A Vadj=0V conditions below. Vctrl=2.75V, Io=1.5A Vctrl=2.75V, Io=5A Vctrl=2.75V, Io=6A Vctrl=2.75V,Vin=2.05V, dVo=100mV Vadj=0V Vctrl=5V, Vin=3.3V, Vadj=0V, Pulse Vctrl=5V, Vin=5V, Io=5A,Vadj=0V Tj=25, Vripple=1Vpp 120Hz 1.250 1.250 1.257 1.263 UNITS
Line Regulation Load Regulation (note Dropout Voltage (note ctrl Vout
1.00 1.10 1.20
1.30
Dropout Voltage (note Vout
0.15 0.40 0.55
0.20 0.52 0.62
Current Limit Minimum Load Current (note Thermal Regulation Ripple Rejection
0.01 0.02
2-74
Rev. 12/18/00
IRU1160
ELECTRICAL SPECIFICATIONS
PARAMETER
Control Current
TEST CONDITION
Vadj=0V below conditions. Vctrl=2.75V, Vin=2.05V, Io=1.5A Vctrl=2.75V, Vin=2.05V, Io=5A Vctrl=2.75V, Vin=2.05V, Io=6A
UNITS
Adjust Current
Iadj
Vctrl=2.75V, Vin=2.05V, Vadj=0V
Note duty cycle pulse testing with Kelvin connections required order maintain accurate data. Note Dropout voltage defined minimum differential between required maintain regulation Vout measured when output voltage drops below nominal value.
Note Minimum load current defined minimum current required output order output voltage maintain regulation. Typically resistor dividers selected such that automatically maintains this current.
DESCRIPTIONS
SYMBOL Vsense DESCRIPTION This positive side reference which allows remote load sensing achieve excellent load regulation. resistor divider from this Vout ground sets output voltage. output regulator. minimum 10µF capacitor must connected from this ground insure stability. This supply internal control circuitry well base drive pass transistor.This must always higher than Vout order device regulate. (see specifications) input regulator.Typically large storage capacitor connected from this ground insure that input voltage does below minimum drop voltage during load transient response. This must always higher than Vout order device regulate. (see specifications)
Vout
Vctrl
Rev. 12/18/00
2-75
IRU1160
BLOCK DIAGRAM
Vout
Vctrl
1504
Vsense
1.25V CURRENT LIMIT
THERMAL SHUTDOWN
1160blk1-1.0
Figure Simplified block diagram IRU1160
APPLICATION INFORMATION
Introduction IRU1160 adjustable regulator five-terminal device designed specificaly provide extremely dropout voltages comparable type without disadvantage extra power dissipation base current associated with regulators.This done bringinging control regulator that provides base current power connecting voltage that grater than voltage present pin.This flexibility makes IRU1160 ideal applications where dual inputs available such computer motherboard with style power supply that provides 3.3V board. such application graphic chipsets that require anywhere from 2.4V 2.7V supply such Intel I740 chipset. IRU1160 easily programmed with addition external resistors voltages within range 1.25 Another major requirement these graphic chips such Intel I740 need switch load current from zero several amps tens nanoseconds processor pins, which translates approximately 500nS current step regulator. addition, output voltage tolerances also extremely tight they include transient response part specification.
IRU1160 specifically designed meet fast current transient needs well providing accurate initial voltage, reducing overall system cost with need fewer number output capacitors. Another feature device true remote sensing capability which allows accurate voltage setting load rather than device. Output Voltage Setting IRU1160 programmed voltages range 1.25V 5.5V with addition external resistors according following formula: VOUT VREF IADJ Where:: VREF =125 Typically Wehre .125V Typically IADJ Typically shown Figure
Vout
Vout
IRU1160 IRUS160
Vctrl
Vctrl Vsense Vref
IAdj 50uA
1160app2-1.0
Figure Typical application IRU1160 programming output voltage
2-76
Rev. 12/18/00
IRU1160
IRU1160 keeps constant 1.25V between Vsense Vadj pin. placing resistor across these pins connecting Vsense Vout together, constant current flows through adding Iadj current into resistor producing voltage equal (1.25/R1)*R2 Iadj*R2. This voltage then added 1.25V output voltage. This summarized above equation. Since minimum load current requirement IRU1160 10mA, typically selected resistor that automatically satisfies this condition. Notice that since Iadj typically range 50µA only adds small error output voltage should considered when very precise output voltage setting required. Load Regulation Since IRU1160 separate pins output (Vout) sense (Vsense), ideal providing true remote sensing output voltage load.This means that voltage drops parasitic resistance such traces between regulator load compensated using remote sensing. Figure shows typical application IRU1160 with remote sensing. most applications minimum 100µF aluminum electrolytic capacitor such Sanyo, MVGX series, Panasonic series well Nichicon series insures both stability good transient response. Thermal Design IRU1160 incorporates internal thermal shutdown that protects device when junction temperature exceeds allowable maximum junction temperature. Although this device operate with junction temperatures range 150°C, recommended that selected heat sink chosen such that during maximum continuous load operation junction temperature kept below this number. example below shows steps selecting proper surface mount package. Assuming, following conditions: Vout =2.8V Vin=3.3V Vctrl=5V Iout Calculate maximum power dissipation using following equation: Pd=Iout in-V (Iout /60)*(V ctrl Vout Pd=3*(3.3-2.8) (3/60)*(5-2.8)=1.61
Vout
IRU1160 Vctrl
Vctrl Vsense
Using table below select proper package amount copper board needed. TO-263 TO-263 TO-263 TO-263 Copper JA(°C/W) Area 1.4"X1.4" 1.0"X1.0" 0.7"X0.7" Size (Ta=25°C) 4.4W 3.7W 3.1W 2.4W (Ta=45°C) 3.6W 3.0W 2.6W 2.0W
16ap-.
Figure Schematic showing connection best load regulation Stability IRU1160 requires output capacitor part frequency compensation order make regulator stable. Typical designs microprocessor applications standard electrolytic capacitors with typical range 100m output capacitance 1000µF. Fortunately capacitance increases, decreases resulting fixed time constant. IRU1160 takes advantage this phenomena making overall regulator loop stable.
Note: Above table based maximum junction temperature 135°C.
Rev. 12/18/00
2-77
IRU1160
Notes
2-78
Rev. 12/18/00

ULTRA DROPOUT POSITIVE ADJUSTABLE REGULATOR 0.62V Dropout Fast Tr

Top Searches for this datasheet

Other recent searches