APU1206/APU1207/APU1208/APU1209
201210266
Data and specifications subject to change without notice.
TYPICAL APPLICATION
DESCRIPTION
The APU1206 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
only available and the dropout voltage is less than 1V,
exceeding the minimum dropout characteristics of NPN/
PNP hybrid regulators. One common application of these
regulators is 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: micro-power shut-
down capability and output UVLO detection where Flag
pin is switched low when output is below 5% of its nomi-
nal point.
1A VERY LOW DROPOUT POSITIVE
FIXED AND ADJUSTABLE REGULATORS
Technology Licensed from International Rectifier
Figure 1 - Typical application of the 1206-XX in a 3-Pin SOT-223 package.
Low Dropout Voltage (500mV at 1A)
2% Voltage Reference Accuracy
Low Ground Current
1µA Maximum Quiescent Current in Shutdown
(APU1207, APU1208)
Fast Transient Response
Current Limit and Thermal Shutdown
Error Flag Signal for Output out of Regulation
(APU1207, APU1208)
RoHS Compliant & Halogen Free
FEATURES
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 Switch Mode
Power Supply (SMPS)
APPLICATIONS
V
IN
V
OUT
C1
C2
APU1206-
XX
3
1
2
V
OUT
Gnd
V
IN
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Electronics Corp.
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APU1206/APU1207/APU1208/APU1209
2
PACKAGE ORDER INFORMATION
TJ (°C) 2-PIN 3-PIN 8-PIN PLASTIC VOLTAGE PIN FUNCTIONS
TO-252(H) SOT-223(K) SOIC(M)
0 To 125 APU1206H-18 APU1206K-18 NA 1.8V VIN, VOUT, Gnd
0 To 125 APU1206H-25 APU1206K-25 NA 2.5V VIN, VOUT, Gnd
0 To 125 APU1206H-33 APU1206K-33 NA 3.3V VIN, VOUT, Gnd
0 To 125 NA NA APU1207M-18 1.8V VIN, VOUT, Gnd, Enable, Flag
0 To 125 NA NA APU1207M-25 2.5V VIN, VOUT, Gnd, Enable, Flag
0 To 125 NA NA APU1207M-33 3.3V VIN, VOUT, Gnd, Enable, Flag
0 To 125 NA NA APU1208M Adj VIN, VOUT, Gnd, Flag, Adj
0 To 125 NA NA APU1209M Adj VIN, VOUT, Gnd, Enable, Adj
Basic Part
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Electronics Corp.
APU1206/APU1207/APU1208/APU1209
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ABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) .................................................... 10V
Enable Input Voltage ................................................ 10V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 135°C
PACKAGE INFORMATION
θJA=55°C/W
for 1" Sq pad
2-PIN PLASTIC TO-252 (H) 3-PIN PLASTIC SOT-223 (K)
APU1206 APU1206
θJA=70°C/W
for 0.5" Sq pad
θJA=90°C/W
for 0.4" Sq pad
8-PIN PLASTIC SOIC (M)
APU1207 APU1208 APU1209
θJA=55°C/W
for 1" Sq pad
θJA=55°C/W
for 1" Sq pad
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=COUT=10µF, V IN=Vo+1V, VOUT=VFB (For adjustable
version only), and TA=25°C. Typical values refer to TA=25°C. Low duty cycle pulse testing is used which keeps
junction and case temperatures equal to the ambient temperature.
V
IN
V
OUT
Tab is
Gnd
1
3
FRONT VIEW
V
IN
Gnd
V
OUT
Tab is
Gnd
3
1
2
TOP VIEW
GndFlag
V
OUT
V
IN
Enable
Gnd
Gnd
Gnd
4
3
2
1
5
6
7
8
TOP VIEW
GndAdj
V
OUT
V
IN
Flag
Gnd
Gnd
Gnd
4
3
2
1
5
6
7
8
TOP VIEW
GndAdj
V
OUT
V
IN
Enable
Gnd
Gnd
Gnd
4
3
2
1
5
6
7
8
TOP VIEW
Initial Voltage Accuracy
(see Table 1 for nominal values)
Line Regulation
Load Regulation (Note 1)
Output Voltage Temp Coef.
Dropout Voltage (Note 2)
Ground Current (Note 3)
Current Limit
Minimum Input Voltage
APU1208, APU1209
Adjust Pin Current
Minimum Load Current
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Vo
∆VI
∆VL
∆VO(T)
∆VI(O)
IQ
ICL
VIN(min)
IADJ
IO(min)
Io=10mA, TA=25℃
Vo + 1V<VIN<10
10mA<Io<1A
1mA<Io<150mA
Io=100mA
Io=500mA
Io=1000mA
VIN=Vo + 1 for all conditions:
Io=100mA
Io=500mA
Io=1000mA
Vo=5% Below Regulation Point
VIN=2.5V, Vo=VADJ
-2
1.1
1
0.5
0.5
20
100
300
500
1.4
2.1
2
1
0.7
0.5
100
200
400
650
3
15
50
2.3
0.1
%
%
%
ppm/℃
mV
mA
A
V
µA
mA
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APU1206/APU1207/APU1208/APU1209
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PIN DESCRIPTIONS
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 minimum drop out voltage
during the load transient response. This pin must always be 0.6V higher than VOUT in order
for the device to regulate properly.
The output of the regulator. A minimum of 2.2µF capacitor must be connected from this pin
to ground.
Ground pin. This pin must be connected to the lowest potential in the system and 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.
An open collector output that switches low when the output voltage drops about 4% below
its expected regulated voltage.
A resistor divider from this pin to the VOUT pin and ground sets the output voltage.
APPLICATION INFORMATION
Stability
The APU120X 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 2.2µF
capacitance and the ESR in the range of 0.5 to 2Ω in-
sures the stability of the system.
Part Number Output
Voltage
APU1206-18 1.8V
APU1206-25 2.5V
APU1206-33 3.3V
APU1207-18 1.8V
APU1207-25 2.5V
APU1207-33 3.3V
APU1208 1.24V
APU1209 1.24V
Note 1: Low duty cycle pulse testing with Kelvin con-
nections is required in order to maintain accurate data.
Note 2: Dropout voltage is defined as the minimum dif-
ferential voltage between VIN and VOUT required to main-
tain regulation at VOUT. It is measured when the output
voltage drops 1% below its nominal value.
APU1207, APU1209
Ground Current - SD Activated
Enable Pin Input LO Voltage
Enable Pin Input HI Voltage
Enable Pin Input LO Current
Enable Pin Input HI Current
APU1207, APU1208
Flag Output Threshold Voltage
Flag Output Hysteresis Voltage
Flag Output Saturation Voltage
Note 3: Ground current is the regulator quiescent cur-
rent plus the pass transistor current. The total current
from the supply is the sum of the load current plus the
ground pin current.
VIN
(All devices)
VOUT
(All devices)
Gnd
(All devices)
Enable
(APU1207, APU1209)
Flag
(APU1207, APU1208)
Adj
(APU1208, APU1209)
Table 1 - Output voltage vs. part number.
PIN SYMBOL PIN DESCRIPTION
IQ(SD)
VEN(L)
VEN(L)
VTH(FG)
VHYS
VF(SAT)
Enable=Open
Regulator OFF
Regulator ON
VEN(L)=0V to 0.8V
VEN(L)=2V to Vin
Output Ramping Up
Io=5mA
Io=500µA
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
2
0.01
0.1
100
5
0.8
400
230
1
0.8
2
600
µA
V
V
µA
µA
%VO
%VO
mV
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APU1206/APU1207/APU1208/APU1209
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Ref Desig Description Qty Part # Manuf
C1 Capacitor 1 10µF, Tantalum AVX
C2 Capacitor 1 10µF, Tantalum AVX
R1 Resistor 1 10KΩ,5% Panasonic
TYPICAL APPLICATION
Ref Desig Description Qty Part # Manuf
C1 Capacitor 1 10µF, Tantalum AVX
C2 Capacitor 1 10µF, Tantalum AVX
Figure 2 - Typical application of APU1206.
Figure 3 - Typical application of APU1207.
Note: Tab must also be
connected to ground.
V
IN
V
OUT
C1
C2
APU1206-
XX
3
1
2
V
OUT
Gnd
V
IN
V
IN
V
OUT
R1
C1
C2
SD Enable
APU1207
Error Flag
1
2
3
4
Enable
V
IN
Gnd
V
OUT
Flag
Gnd
Gnd
Gnd
8
7
6
5
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Electronics Corp.
APU1206/APU1207/APU1208/APU1209
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TYPICAL APPLICATION
Figure 4 - Typical application of APU1208 in 3.3V to 2.5V regulator.
Ref Desig Description Qty Part # Manuf
C1 Capacitor 1 10µF, Tantalum AVX
C2 Capacitor 1 10µF, Tantalum AVX
R1 Resistor 1 127Ω, 1%
R2 Resistor 1 124Ω, 1%
R3 Resistor 1 10KΩ, 5%
V
IN
V
OUT
R1
R2
C1
C2
APU1208
R3
Error Flag
1
2
3
4
Flag
V
IN
Gnd
V
OUT
Adj
Gnd
Gnd
Gnd
8
7
6
5
Vo = 1.24 X 1 + R1
R2
( )
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APU1206/APU1207/APU1208/APU1209
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TYPICAL APPLICATION
Figure 5 - Typical application of APU1209 in 3.3V to 2.5V regulator.
Ref Desig Description Qty Part # Manuf
C1 Capacitor 1 10µF, Tantalum AVX
C2 Capacitor 1 10µF, Tantalum AVX
R1 Resistor 1 127Ω, 1%
R2 Resistor 1 124Ω, 1%
V
IN
V
OUT
R1
R2
C1
C2
APU1209
SD Enable
1
2
3
4
Enable
V
IN
Gnd
V
OUT
Adj
Gnd
Gnd
Gnd
8
7
6
5
Vo = 1.24 X 1 + R1
R2
( )
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APU1206/APU1207/APU1208/APU1209
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APU1209 Line Regulation @ 5mA to 100mA
1.2
1.205
1.21
1.215
1.22
1.225
1.23
1.235
1.24
1.245
1.25
12V
11.5V
11V
10.5V
10V
9.5V
9V
8.5V
8V
7.5V
7V
6.5V
6V
5.5V
5V
4.5V
4V
3.5V
3V
2.5V
2V
Input Voltage
Vout
0.00%
0.50%
1.00%
1.50%
2.00%
2.50%
3.00%
3.50%
4.00%
4.50%
5.00%
% Error
Vout
Percent Error
CHARACTERISTICS
5 Sep 2001
15:15:05
APU1209 Maximum Output Current ~ 1.25A
while in the current limit mode.
APU1209 Output Voltage in Yellow. A DC offset equal
to the output voltage is applied to improve resolution.
The output is regulating current in this mode.
Figure 6
Figure 7
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APU1206/APU1207/APU1208/APU1209
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APU1209 Voltage Drop-out Variation with Ambient Temperature
with various load currents
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
-50 0 50 100 150
Temperature (℃)
mA
100 mA
500 mA
1 A
APU1209 Ground Current Variation with Ambient Temperature
0
10
20
30
40
50
60
70
80
90
100
-50 0 50 100 150
Ambient Temperature (℃)
mA
CHARACTERISTICS
Figure 8 Figure 9
Figure 10
APU1209 Vout Variation with Ambient Temperature
w ith Vin @ 3.5V and 12V
2.46
2.47
2.48
2.49
2.50
2.51
2.52
2.53
2.54
2.55
-50 0 50 100 150
3.5 V
12V
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Electronics Corp.
Advanced Power
Electronics Corp. APU1206/APU1207/APU1208/APU1209
MARKING INFORMATION
SO-8
SOT-223
TO-252
10
Part Number
U120X-XX
YWWSSS
Output Voltage
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
U1206-XX
YWWSSS
U1206-XX
YWWSSS
Part Number
Output Voltage
Part Number
Output Voltage
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
