Advanced Power Technology Licensed from International Rectifier
Electronics Corp. 300mA ULTRA LOW DROPOUT POSITIVE
A
DJUSTABLE AND FIXED REGULATORS
FEATURES DESCRIPTION
Stable with 2.2uF Ceramic Capacitor
2% Voltage Reference Accuracy
Only 270mV Dropout at 300mA
and 170mV Dropout at 150mA
5uA Quiescent Current in Shutdown
Current Limit and Thermal Shutdown
Logic Input Enable Pin
RoHS Compliant & Halogen-Free
SOT-23-5L & SOT-23-5LR Package
APPLICATIONS
Laptop, Notebook & Palmtop computers
Battery Powered Equipments
PCMCIA Vcc & Vpp Regulator
Consumer Electronics
High Efficiency Linear Power Supplies
Data and specifications subject to change without notice
201206088
APU1205
TYPICAL APPLICATION
PACKAGE / ORDERING INFORMATION
1
The APU1205 device is an efficient linear voltage
regulator with better than 2% initial voltage accuracy, very
low dropout voltage and very low ground current designed
especially for hand held, battery powered applications.
Other features of the device are: TTL compatible
enable/shutdown control input, current limiting and thermal
shutdown.
The APU1205 is available in fixed and adjustable
output voltage versions in a small SOT-23 5-Pin package.
Figure 1 - Typical application of the APU1205 adjustable voltage regulator.
Figure 2 - Typical application of the APU1205-25 fixed voltage regulator.
VIN
GND
EN
VOUT
ADJ
Enable
VIN VOUT
Vo= 1.25 x (1+R1/R2)
C2
2.2uF
C1
2.2uF R1
R2
+
+
VIN
GND
EN
VOUT
CBYP
Enable
VIN=3.3V VOUT=2.5V
C2
2.2uF
C1
2.2uF +
+
+C3
1000pF
ADJ Fixed ADJ Fixed
APU1205X-XX-HF
Y5 : SOT-23-5L
Y5R : SOT-23-5LR
Package Output Voltage
Blank : AD J
18 : 1.8V
25 : 2.5V
33 : 3.3V
Halogen Free
VINGNDEN
ADJ VOUT
TOP VIEW
SOT-23-5L
123
45
EN GND VIN
VOUTCBYP
TOP VIEW
SOT-23-5L
123
45
ENGNDVIN
VOUT ADJ
TOP VIEW
SOT-23-5LR
123
45
VIN GND EN
CBYPVOUT
TOP VIEW
SOT-23-5LR
123
45
Advanced Power
Electronics Corp. APU1205
ABSOLUTE MAXIMUM RATINGS (TA=25oC, unless otherwise specified.)
Input Voltage (VIN) ----------------------------------------
-
10V
Enable Input Voltage (VEN) -----------------------------
-
10V
Storage Temperature Range (TST) -------------------
-
-65 to 150oC
Operating Junction Temperature Range (TJ) ------
-
0 to 150oC
Thermal Resistance Junction to Ambient (Rthja) 256oC/W
ELECTRICAL SPECIFICATIONS
VIN=VO + 1V(for fixed voltage devices), VOUT=VFB(for adjustable version only), CBYP=470pF (for fixed voltage devices),
VEN=2V and TA=25oC. Typical values refer to TA=25oC. Low duty cycle pulse testing is used which keeps junction and
case temperatures equal to the ambient temperature.
Parameter SYM TEST CONDITION MIN TYP MAX UNITS
Reference Voltage (See Table
1 for t
yp
ical values
)
Vo -2 - 2 %
Line Regulation ∆VIVO + 1V<VIN<10V - 0.005 - %/V
1mA<IO<100mA - 0.8 - %
100mA<IO<300mA - 0.1 - %
IO=100uA -1050
IO=50mA - 85 110
IO=150mA - 170 220
IO=300mA - 270 350
VEN=2V, IO=100uA - 120 160
VEN=2V, IO=50mA - 460 600
VEN=2V, IO=150mA - 2200 2900
VEN=2V, IO=300mA - 7200 9500
Ground Current-SD Activated IQ(SD) VEN =0V to 0.8V or Open -5-uA
Adjust Pin Current IADJ VIN=2.5V, VO=VADJ - 0.1 - uA
Current Limit ICL VO=0V 320 420 - mA
Thermal Regulation ΔVPVIN=10V, IO=150mA, 10ms Pulse - 0.05 - %/W
Enable Pin Input LO Current VEN(L) =0V to 0.8V - 0.01 -
Enable Pin Input HI Current VEN(H)=2V to VIN -20-
Enable Pin Input LO Voltage VEN(L) Regulator OFF - - 0.8 V
Enable Pin Input HI Voltage VEN(H) Regulator ON 2 - - V
Note 1: Low duty cycle pulse testing with Kelvin connections is required in order to maintain accurate data.
Note 2: Dropout 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.
Note 3: Ground current is 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.
2
Unless otherwise specified, these specifications apply over CIN=CO=2.2uF, IO=100uA, VIN(MIN)=2.5V(Adjustable devices),
Load Regulation (Note 1) ∆VL
uA
mV
Ground Current (Note 3) IQuA
Dropout Voltage (Note 2) VDROP
Advanced Power
Electronics Corp. APU1205
PIN DESCRIPTIONS
PIN SYMBOL PIN DESCRIPTION
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 higher
than VOUT by at least the amount of the dropout voltage and some margin in order
for the device to regulate properly.
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.
A resistor divider from this pin to the VOUT pin and ground sets the output voltage.
To minimize the error due to the error amplifier, select the values of the resistor
dividers to be less than 10K .
CBYP (Fixed only) A 470 to 1000pF bypass capacitor connected to this pin reduces the output noise.
The output of the regulator. A minimum of 2.2uF with max ESR of 1Ω capacitor
must be connected from this pin to ground to insure stability.
Table 1- Nominal output voltage vs. part number.
BLOCK DIAGRAM
3
EN
VOUT
VIN
GND
Adj (Adjustable only)
Part Number Output Voltage
APU1205 1.25V
APU1205-18 1.8V
APU1205-25 2.5V
APU1205-33 3.3V
The output voltage of the adjustable device can be set using:
VO= 1.25 x (1+R1/R2)
Where:
R1 = Resistor connected from output to the Adj pin
R2 = Resistor connected from Adj pin to Gnd
+
-
Thermal
Shutdown
+
1
4
2
5
3
VIN
ADJ
GND
VOUT
EN
Figure 3 - APU1205Y5 Adjustable output block diagram.
Advanced Power
Electronics Corp. APU1205
BLOCK DIAGRAM
4
+
-
Thermal
Shutdown
+
1
4
2
5
3
VIN
CBYP
GND
VOUT
EN
Figure 4 - APU1205-18, APU1205-25 and APU1205-33 Fixed output block diagram.
Advanced Power
Electronics Corp. APU1205
MARKING INFORMATION
SOT-23-5L
SOT-23-5LR
5
RB&SS
Part Number : RB
Date Code
SS:2004,2008,2012…
SS:2003,2007,2011…
SS:2002,2006,2010…
SS:2001,2005,2009…
Output Voltage :
Output
Voltage V
OUT
Co d e
ADJ Blank
1.8V A
2.5V B
3.3V E
Rb&SS
Part Number : Rb
Date Code
SS:2004,2008,2012…
SS:2003,2007,2011…
SS:2002,2006,2010…
SS:2001,2005,2009…
Output Voltage :
Output
Voltage V
OUT
Co d e
ADJ Blank
1.8V A
2.5V B
3.3V E
