US1206/1207/1208/1209
1A ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE & FIXED REGULATOR
PRELIMINARY DATASHEET
FEATURES
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
DESCRIPTION
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 fea-
tures 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.
APPLICATIONS
2.5V Supply from 3.3V Input for the new genera-
tion of Logic ICs
Computer Mother Board, Add on Cards
High Efficiency Post Regulator in SMPS
TYPICAL APPLICATION
Vout
3
2
1
C2
Vout
US1206-XX
Gnd
Vin
1206app1-1.0
Vin
C1
PACKAGE ORDER INFORMATION
Tj (°C)
0 TO 125
0 TO 125
0 TO 125
0 TO 125
0 TO 125
0 TO 125
0 TO 125
0 TO 125
Rev. 1.1
6/26/00
3 LEAD
TO252
US1206-18CD
US1206-25CD
US1206-33CD
NA
NA
NA
NA
NA
5 LEAD
TO263
US1206-18CY
US1206-25CY
US1206-33CY
US1207-18CM
US1207-25CM
US1207-33CM
US1208CM
US1209CM
8 PIN PLASTIC
SOIC Power
US1206-18CM
US1206-25CM
US1206-33CM
US1207CS
US1207CS
US1207CS
US1208CS
US1209CS
Voltage
1.8V
2.5V
3.3V
1.8V
2.5V
3.3V
Adj
Adj
Pin Functions
Vin, Vout, GND
Vin, Vout, GND
Vin, Vout, GND
Vin, Vout, GND, Enable, Flag
Vin, Vout, GND, Enable, Flag
Vin, Vout, GND, Enable, Flag
Vin, Vout, GND, Flag, Adj
Vin, Vout, GND, Adj, Enable
2-1
US1206/1207/1208/1209
ABSOLUTE 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 INFORMATION
5 PIN PLASTIC TO263 ( M ) or 5 PIN POWER FLEX (P)
US1207
US1208
US1209
FRONT VIEW
5
4
3
2
1
FRONT VIEW
FRONT VIEW
3 PIN PLASTIC TO263 ( M )
US1206-XX
FRONT VIEW
Flag
Vout
Gnd
Vin
Enable
5
4
3
2
1
Adj
Vout
Gnd
Vin
Flag
5
4
3
2
1
Adj
Vout
Gnd
Vin
Enable
3
Vout
Gnd
Vin
2
1
θ
JA
=35°C/W for 0.5" square pad
8 PIN PLASTIC POWER SOIC ( S )
US1207
US1208
TOP VIEW
TOP VIEW
θ
JA
=35°C/W for 0.5" square pad
US1209
TOP VIEW
Enable
Vin
Vout
Flag
1
2
3
4
8
7
6
5
Gnd
Gnd
Gnd
Gnd
Flag
Vin
Vout
Adj
1
2
3
4
8
7
6
5
Gnd
Gnd
Gnd
Gnd
Enable
Vin
Vout
Adj
1
2
3
4
8
7
6
5
Gnd
Gnd
Gnd
Gnd
θ
JA
=55°C/W for 1" Sq pad
3 PIN PLASTIC TO252 ( D )
US1206
FRONT VIEW
3
3 PIN PLASTIC SOT223 ( Y )
US1206
TOP VIEW
3
Vout
Vout
Gnd
Vin
Tab is
Gnd
4
θ
JA
=70°C/W for
0.5" Sq pad
1
Tab is
Gnd
2
1
θ
JA
=90°C/W for
0.4" Sq pad
Vin
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
ELECTRICAL SPECIFICATIONS
2-2
Rev. 1.1
6/26/00
US1206/1207/1208/1209
US1207,1208
Ground Current-S.D Activated
Enable pin input LO voltage
Enable pin input HI voltage
Enable pin input LO current
Enable pin input HI current
US1207,1209
Flag Output Threshold Voltage
Flag Output Hysterises Voltage
Flag Output Saturation Voltage
SYM
Iqsd
Venl
Venh
TEST CONDITION
Enable=0V
Regulator OFF (Note 4)
Regulator ON (Note 4)
Venl=0V to 0.8V (Note 4)
Venh=2V to Vin (Note 4)
MIN
TYP MAX
0.01
1
0.8
0.1
100
2
600
UNITS
uA
V
V
uA
uA
2
3.8
%Vo
Output Ramping Up
0.8
%Vo
Io=5mA
400
mV
Io=500uA
230
mV
Note 1 :
Low duty cycle pulse testing with Kelvin con-
Note 3
: Ground current is the the regulator quiescent
nections are required in order to maintain accurate data. current plus the pass transistor current. The total cur-
Note 2 :
Drop-out voltage is defined as the minimum rent from the supply is the sum of the load current plus
differential voltage between Vin and Vout required to main- the ground pin current.
tain regulation at Vout. It is measured when the output
Note 4
: The specification applies for the junction tem-
voltage drops 1% below its nominal value.
perature of 0 to +125°C.
Vthfg
Vhys
Vfsat
Pin DescRIPTIONS
PIN SYMBOL
Adj
US1208,1209
Flag
US1208
Vout
All devices
GND
All devices
Enable
US1207,1209
Vin
All devices
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 poten-
tial 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 al-
ways be 0.6V higher than Vout in order for thedevice to regu-
late properly.
Output
Voltage
1.8V
2.5V
3.3V
1.8V
2.5V
3.3V
1.24V
1.24V
Part Number
US1206-18
US1206-25
US1206-33
US1207-18
US1207-25
US1207-33
US1208
US1209
APPLICATION 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
US1206/1207/1208/1209
TYPICAL APPLICATION
Vout
3
2
1
C2
Vout
US1206-XX
Gnd
Vin
1206app1-1.0
Vin
C1
Figure 1- Typical application of US1206
Ref Desig
C1
C2
Description
Capacitor
Capacitor
Qty
1
1
Part #
10uF, Tantalum
10uF, Tantalum
Manuf
AVX
AVX
2-4
Rev. 1.1
6/26/00
US1206/1207/1208/1209
TYPICAL APPLICATION
Flag
Vout
5
4
R1
Error Flag
Vout
C2
US1207
Gnd
Vin
Enable
3
2
1207app1-1.0
1
S.D.
Enable
Vin
C1
Pin numbers in this
schematic apply only
to TO263(M) package.
Figure 1- Typical application of US1207
Ref Desig
C1
C2
R1
Description
Capacitor
Capacitor
Resistor
Qty
1
1
1
Part #
10uF, Tantalum
10uF, Tantalum
10kΩ , 5%
Manuf
AVX
AVX
Panasonic
Rev. 1.1
6/26/00
2-5
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