UNISEM US1209CS, US1209CM, US1208CS, US1208CM, US1207CS Datasheet
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US1206/1207/1208/1209
1A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE & FIXED REGULATOR
PRELIMINARY DATASHEET
FEATURESFEATURES
Low Droput Voltage (500mV at 1A)
1% Voltage Reference Accuracy
Low Ground Current
10uA Quiescent Current in Shutdown
(US1207,1208)
Fast Transient Response
Current Limit and Thermal Shutdown
Error Flag Signal for Output out of Regulation
(US1207,1209)
Pin Compatible with MIC39100/101/102 series
APPLICATIONSAPPLICATIONS
2.5V Supply from 3.3V Input for the new generation of Logic ICs
Computer Mother Board, Add on Cards
High Efficiency Post Regulator in SMPS
TYPICAL APPLICATIONTYPICAL APPLICATION
US1206-XX
Vout
Gnd
Vin
DESCRIPTIONDESCRIPTION
The US1206 family of devices are ultra low dropout 1A
regulators using PNP transistor as the pass element.
These products are ideal when a single input supply is
available only and the dropout voltage is less than 1V,
exceeding the minimum dropout characteristics of NPN/
PNP hybrid regulators. One common application of these
regulators are where input is 3.3V and a 2.5V output is
needed.
Besides the low dropout of less than 0.5V, other features of the family of the parts are; micropower shutdown
capability and output UVLO detection where Flag pin is
switched low when output is below 5% of its nominal
point. The US1206-XX in SOT223 is pin compatible with
MIC39100-XX, US1207 and 1209 in SO8 power package
are compatible with MIC39101 and 39102 respectively.
3
2
1
Vout
C2
1206app1-1.0
Vin
C1
PACKAGE ORDER INFORMATIONPACKAGE ORDER INFORMATION
Tj (°C) 3 LEAD 5 LEAD 8 PIN PLASTIC Voltage Pin Functions
TO252 TO263 SOIC Power
0 TO 125 US1206-18CD US1206-18CY US1206-18CM 1.8V Vin, Vout, GND
0 TO 125 US1206-25CD US1206-25CY US1206-25CM 2.5V Vin, Vout, GND
0 TO 125 US1206-33CD US1206-33CY US1206-33CM 3.3V Vin, Vout, GND
0 TO 125 NA US1207-18CM US1207CS 1.8V Vin, Vout, GND, Enable, Flag
0 TO 125 NA US1207-25CM US1207CS 2.5V Vin, Vout, GND, Enable, Flag
0 TO 125 NA US1207-33CM US1207CS 3.3V Vin, Vout, GND, Enable, Flag
0 TO 125 NA US1208CM US1208CS Adj Vin, Vout, GND, Flag, Adj
0 TO 125 NA US1209CM US1209CS Adj Vin, Vout, GND, Adj, Enable
Rev. 1.1
6/26/00
2-1
US1206/1207/1208/1209
ABSOLUTE MAXIMUM RATINGSABSOLUTE MAXIMUM RATINGS
Input Voltage (Vin) ............................................................. 12V
Enable Input Voltage ........................................................... 12V
Storage Temperature Range ................................ -65°C TO 150°C
Operating Junction Temperature Range ...................... 0°C TO 135°C
PACKAGE INFORMATIONPACKAGE INFORMATION
5 PIN PLASTIC TO263 ( M ) or 5 PIN POWER FLEX (P) 3 PIN PLASTIC TO263 ( M )
US1207 US1208 US1209 US1206-XX
FRONT VIEW
5
Flag
4
Vout
3
Gnd
2
Vin
1
Enable
FRONT VIEW
FRONT VIEW
5
Adj
4
Vout
3
Gnd
2
Vin
1
Flag
5
Adj
4
Vout
3
Gnd
2
Vin
1
Enable
θJA=35°C/W for 0.5" square pad θJA=35°C/W for 0.5" square pad
8 PIN PLASTIC POWER SOIC ( S )
US1207 US1208 US1209
TOP VIEW
Enable
Vin
Vout
1
2
3
4
8
Gnd
7
Gnd
6
Gnd
5
GndFlag
3 PIN PLASTIC TO252 ( D ) 3 PIN PLASTIC SOT223 ( Y )
US1206 US1206
Tab is
Gnd
FRONT VIEW
3
4
1
Flag
Vin
Vout
1
2
3
4
Vout
Vin
TOP VIEW
θJA=70°C/W for
0.5" Sq pad
TOP VIEW
8
Gnd
7
Gnd
6
Gnd
5
GndAdj
Enable
Vin
Vout
1
2
3
4
8
Gnd
7
Gnd
6
Gnd
5
GndAdj
θJA=55°C/W for 1" Sq pad
TOP VIEW
Tab is
Gnd
FRONT VIEW
3
Vout
2
Gnd
1
Vin
3
Vout
2
Gnd
1
Vin
θJA=90°C/W for
0.4" Sq pad
ELECTRICAL SPECIFICATIONSELECTRICAL SPECIFICATIONS
Unless otherwise specified ,these specifications apply over ,Cin=Cout=10uF,Vin=Vo+1V, Vout=Vfb (for adjustable
version only), and Ta=25 °C. Typical values refer to Ta=25 °C.Low duty cycle pulse testing are used which keeps
junction and case temperatures equal to the ambient temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage Vo Io=10mA -1 1 %
See Table 1 for typical values (Note 4) -2 2
Line Regulation dVi Vo+1V<Vin<12 0.06 %/V
Load Regulation (note 1) dVL 10mA<Io<1A 0.7 %
1mA<Io<150mA 0.5 %
Output voltage Temp Coef. dVoT 20 100 ppm/°C
Dropout Voltage (note 2) dVio Io=100mA (Note 4) 100 200 mV
Io=500mA (Note 4) 300 400 mV
Io=1000mA (Note 4) 500 650 mV
Ground Current (Note 3) Iq Vin=Vo +1
Io=100mA (Note 4) 3 mA
Io=500mA (Note 4) 15 mA
Io=1000mA (Note 4) 50 mA
Current Limit Icl Vo=0V 1.1 A
Minimum Input Voltage Vinmin 2.1 2.3 V
US1208,1209
Adjust Pin Current Iadj Vin=2.5V,Vo=Vadj (Note 4) 0.1 uA
Minimum Load Current Iomin 1 mA
2-2
Rev. 1.1
6/26/00
US1206/1207/1208/1209
US1207,1208 SYM TEST CONDITION MIN TYP MAX UNITS
Ground Current-S.D Activated Iqsd Enable=0V 0.01 1 uA
Enable pin input LO voltage Venl Regulator OFF (Note 4) 0.8 V
Enable pin input HI voltage Venh Regulator ON (Note 4) 2 V
Enable pin input LO current Venl=0V to 0.8V (Note 4) 0.1 2 uA
Enable pin input HI current Venh=2V to Vin (Note 4) 100 600 uA
US1207,1209
Flag Output Threshold Voltage Vthfg 3.8 %Vo
Flag Output Hysterises Voltage Vhys Output Ramping Up 0.8 %Vo
Flag Output Saturation Voltage Vfsat Io=5mA 400 mV
Io=500uA 230 mV
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 voltage between Vin and Vout required to maintain regulation at Vout. It is measured when the output
voltage drops 1% below its nominal value.
Pin DescRIPTIONSPin DescRIPTIONS
Note 3 : Ground current is the the regulator quiescent
current plus the pass transistor current. The total current from the supply is the sum of the load current plus
the ground pin current.
Note 4 : The specification applies for the junction temperature of 0 to +125°C.
PIN SYMBOL
Adj
US1208,1209
Flag
US1208
Vout
All devices
GND
All devices
Enable
US1207,1209
Vin
All devices
Part Number Output
Voltage
US1206-18 1.8V
US1206-25 2.5V
US1206-33 3.3V
US1207-18 1.8V
US1207-25 2.5V
US1207-33 3.3V
US1208 1.24V
US1209 1.24V
PIN DESCRIPTION
A resistor divider from this pin to the Vout pin and ground sets
the output voltage.
An open collector output that switches low when the output
voltage drops about 4% below its expected regulated voltage.
The output of the regulator .A minimum of 2.2uF capacitor
must be connected from this pin to ground.
Ground pin. This pin must be connected to the lowest potential in the system & all other pins must be at higher potential
with respect to this pin.
Enable pin. A low signal or left open on this pin shuts down the
output.This pin must be tied HI or to Vin for normal operation.
The input pin of the regulator. Typically a large storage
capacitor is connected from this pin to ground to insure that
the input voltage does not sag below the minimumdrop out
voltage during the load transient response. This pin must always be 0.6V higher than Vout in order for thedevice to regulate properly.
APPLICATION INFORMATIONAPPLICATION INFORMATION
Stability
The US120X series of regulators require the use of an
output capacitor as part of the frequency compensation
in order to make the regulator stable. A minimum of
2.2uF capacitance and the ESR in the range of 0.5 to 2
ohm insures the stability of the system.
Table 1- Output voltage v.s. part number
Rev. 1.1
6/26/00
2-3
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