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Details, datasheet, quote on part number:US1175CS
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| Part: | US1175CS |
| Category: | Power Management => Regulators => Linear Regulators => Positive |
| Description: | 7.5a Ultra Low Dropout Positive Adjustable Regulator |
| Company: | Unisem (M) Berhad |
| Datasheet: | Download US1175CS datasheet File size : 37 kB |
| Request For quote: | Find where to buy US1175CS
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Datasheet text preview:
US1175
7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
PRELIMINARY DATASHEET
FEATURES
0.5V Dropout at 7.5A (Equivalent of 67m) ) Fast Transient Response 1% Voltage Reference Initial Accuracy Built-in Thermal Shutdown
DESCRIPTION
The US1175 product is a 7.5A regulator with extremely low dropout voltage using a proprietary Bipolar process that achieves comparable equivalent on resistance to that of discrete MOSFETs. This product is specifically designed to provide well regulated supply for applications requiring very low dropout such as 2.8V from 3.3V ATX power supplies where the same efficiency as the switcher can be achieved without the cost and complexity associated with switching regulators. One such application is the new graphic chip sets that requires 2.7V supply such as the Intel I740 chip set.
APPLICATIONS
3.3V to 2.7V Intel I740 chip set.
TYPICAL APPLICATION
3.3V
C1
Vin Vctrl
5 4 3
R1
US1175
Vout Adj Vsense
2.7V
C3 R2
2 1
1175app1-1.0
5V
C2
Typical application of US1175 .
PACKAGE ORDER INFORMATION
Tj (°C) 0 TO 125 5 PIN PLASTIC 5 PIN PLASTIC TO263 (M) POWER FLEX (P) US1175CM US1175CP 8 PIN PLASTIC SOIC (S) US1175CS
Rev. 1.2 11/29/99
2-1
US1175
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) .. 6V Control Input Voltage (Vctrl) ........ 14V Power Dissipation............ Internally Limited Storage Temperature Range .. -65°C TO 150°C Operating Junction Temperature Range ............ 0°C TO 150°C
PACKAGE INFORMATION
8 PIN PLASTIC SOIC ( S )
TOP VIEW
5 PIN PLASTIC TO263 ( M )
FRONT VIEW 5 4 3 2 1
5 PIN PLASTIC POWER FLEX (P)
FRONT VIEW 5 4 3 2 1
Vctrl Vin Adj Vsense
1 2 3 4
8 7 6 5
Vout Vout Vout Vout
Vin Vctrl Vout Adj Vsense
Vin Vctrl Vout Adj Vsense
JA=55°C/W for 1" Sq pad area
JA=35°C/W for 0.5" square pad
JA=35°C/W for 0.5" square pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over ,Cin=1uF,Cout=10uF, and Tj=0 to 125°C.Typical values refer to Tj=25°C. Vout=Vsense. PARAMETER Reference Voltage SYM Vref TEST CONDITION MIN Vctrl=2.75V,Vin=2V,Io=10mA 1.243 Tj=25,Vadj=0V Vctrl=2.7to12V,Vin=2.05V to 5.5V, 1.237 Io=10mA to 7.5A,Vadj=0V Vctrl=2.5Vto7V,Vin=1.75Vto5.5V ,Io=10mA ,Vadj=0V Vctrl=2.75V,Vin=2.1V,Io=10mA to 7.5A,Vadj=0V Vadj=0V for all conditions below. Vin=2.05V,Io=1.5A Vin=2.05V,Io=3A Vin=2.05V,Io=5A Vin=2.05V,Io=7.5A Vadj=0V for all conditions below. Vctrl=2.75V,Io=1.5A Vctrl=2.75V,Io=3A Vctrl=2.75V,Io=5A Vctrl=2.75V,Io=7.5A Vctrl=2.75V,Vin=2.05V, dVo=100mV Vadj=0V 7.7 Vctrl=5V,Vin=3.3V,Vadj=0V, 30 mS Pulse Vctrl=5V,Vin=5V,Io=3A,Vadj=0V 60 Tj=25,Vripple=1Vpp at 120Hz TYP 1.250 1.250 MAX 1.257 1.263 UNITS V
Line Regulation Load Regulation (note 1) Dropout Voltage (note 2) (Vctrl - Vout)
0.5 2 0.95 1.00 1.05 1.15 0.100 0.200 0.330 0.500 9 5 0.01 70
3 6
mV mV V
1.30 0.130 0.260 0.430 0.650 V
Dropout Voltage (note 2) (Vin - Vout)
Current Limit Minimum Load Current (note 3) Thermal Regulation Ripple Rejection
10 0.02
A mA %/W dB
2-2
Rev. 1.2 11/29/99
US1175
ELECTRICAL SPECIFICATIONS
PARAMETER
Control Pin Current
SYM
TEST CONDITION
Vadj=0V for all below conditions. Vctrl=2.75V,Vin=2.05V,Io=1.5A Vctrl=2.75V,Vin=2.05V,Io=3A Vctrl=2.75V,Vin=2.05V,Io=5A Vctrl=2.75V,Vin=2.05V,Io=7.5A Vctrl=2.75V,Vin=2.05V,Vadj=0V,
MIN
TYP
15 30 50 75 50
MAX
UNITS
mA
Adjust Pin Current
Iadj
120
uA
Note 1 : Low duty cycle pulse testing with Kelvin connections are required in order to maintain accurate data. Note 2 : Drop-out voltage is defined as the minimum differential 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. Typically the resistor dividers are selected such that it automatically maintains this current.
PIN DESCRIPTIONS
PIN # 1 2 3 4 PIN SYMBOL PIN DESCRIPTION This pin is the positive side of the reference which allows remote load sensing Vsense to achieve excellent load regulation. A resistor divider from this pin to the Vout pin and ground sets the output voltage. Adj The output of the regulator. A minimum of 10uF capacitor must be connected from this Vout pin to ground to insure stability. This pin is the supply pin for the internal control circuitry as well as the base drive for Vctrl the pass transistor.This pin must always be higher than the Vout pin in order for the device to regulate.(see specifications) The input pin of the regulator.Typically a large storage capacitor is connected from this Vin 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 in order for the device to regulate.(see specifications)
5
Rev. 1.2 11/29/99
2-3
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