Advanced Power
Electronics Corp.
FEATURES
Stable with 2.2uF Low ESR Ceramic Capacitor
2% Voltage Reference Accuracy
Wide Operating Range: 4.5V ~ 25V
5uA Quiescent Current in Shutdown
Current Limit and Thermal Shutdown
Logic Input Enable Pin
RoHS Compliant & Halogen Free
SOT-89, ESOP-8, J-lead 2021-8, SOT-23-5L
& TSOT-23-5L Package
APU8850
150mA ULTRA LOW DROPOUT POSITIVE
ADJUSTABLE AND FIXED REGULATORS
DESCRIPTION
The APU8850 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 APU8850 is available in fixed and adjustable
output voltage versions in a small SOT-23-5L, TSOT-23-5L,
J-lead 2021-8, ESOP-8 & SOT-89 package.
APPLICATIONS
Laptop, Notebook & Palmtop Computers
Battery Powered Equipments
PCMCIA Vcc & Vpp Regulator
Consumer Electronics
High Efficiency Linear Power Supplies
TYPICAL APPLICATION
VIN
C1
2.2uF
+
VIN
VOUT
R1
+
GND
.
ADJ
R2
C2
2.2uF
VOUT
Vo= 1.25 x (1+R1/R2)
Enable
EN
Figure 1 - Typical application of the APU8850 adjustable voltage regulator.
VIN
C1
2.2uF
+
VIN
VOUT
+
VOUT=3.3V
C2
2.2uF
GND
Enable
EN
CBYP
+
C3
1000pF
Figure 2 - Typical application of the APU8850-33 fixed voltage regulator.
ORDERING INFORMATION
APU8850X-XX
Package
Y5 : SOT-23-5L
TY5 : TSOT-23-5L
U : J-lead 2021-8
G : SOT-89
MP : ESOP-8
Output Voltage
Blank : ADJ
15 : 1.5V
18 : 1.8V
25 : 2.5V
28 : 2.8V
30 : 3.0V
33 : 3.3V
50 : 5.0V
Data and specifications subject to change without notice
1
20130705V9.1
Advanced Power
Electronics Corp.
ABSOLUTE MAXIMUM RATINGS
(T
A
=25
o
C, unless otherwise specified.)
Input Voltage (V
IN
) ----------------------------------------- 27V
Enable Input Voltage (V
EN
) ------------------------------ 27V
Storage Temperature Range (T
ST
) -------------------- -65 to 150
o
C
Operating Junction Temperature Range (T
J
) ------- -40 to 85
o
C
Thermal Resistance Junction to Ambient (R
thja
)
SOT-23-5L/TSOT-23-5L
SOT-89
ESOP-8
J-lead 2021-8
o
256 C/W
APU8850
250
o
C/W
150
o
C/W
300
o
C/W
PACKAGE INFORMATION
ADJ
TOP VIEW
EN GND VIN
Fixed
TOP VIEW
EN GND VIN
ESOP-8 (MP) ADJ
(Top View)
ESOP-8 (MP) Fixed
(Top View)
SOT-89
( Top View )
TAB is VIN
VOUT
SOT-23-5L
TSOT-23-5L
VOUT
SOT-23-5L
TSOT-23-5L
CBYP
NC
NC
ADJ
ADJ
VOUT
1
8
2
7
GND
3
6
4
5
VIN
GND
NC
VOUT
NC
CBYP
NC
.
EN
1
8
2
7
GND
3
6
4
5
VIN
GND
NC
EN
1
2
3
J-lead 2021-8
( Top View )
EN 1
ADJ 2
VOUT 3
VIN 4
8 GND
7 GND
6 GND
5 GND
GND
VIN
VOUT
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over C
IN
=C
O
=2.2F, I
O
=100uA, V
IN(MIN)
=4.5V, C
BYP
=470pF
(for fixed voltage devices), V
EN
=2V and T
A
=25
o
C. Typical values refer to T
A
=25
o
C. Low duty cycle pulse testing is used
which keeps junction and case temperatures equal to the ambient temperature.
Parameter
Reference Voltage
Line Regulation
Load Regulation (Note 1)
Dropout Voltage (Note 2)
Ground Current (Note 3)
Ground Current-SD Activated
Adjust Pin Current
Current Limit
Short Current
Enable Pin Input LO Voltage
Enable Pin Input HI Voltage
SYM
Vo
∆V
I
∆V
L
V
DROP
I
Q
I
Q(SD)
I
ADJ
I
CL
I
Z
V
EN(L)
V
EN(H)
V
O
=0V
Regulator OFF
Regulator ON
TEST CONDITION
V
O
+ 2V<V
IN
<25V, I
O
=1mA
V
IN
=V
O
+2V
I
O
=100uA
I
O
=100mA
V
EN
=2V, I
O
=100uA
V
EN
=0V or Open
V
IN
=4.5V, V
O
=V
ADJ
MIN
-2
-
-
-
-
-
-
-
200
-
-
2
TYP
-
0.1
0.5
1
1.2
250
1
0.1
-
175
-
-
MAX
2
-
-
-
-
-
-
-
-
-
0.8
-
UNITS
%
%/V
%
V
uA
uA
uA
mA
mA
V
V
2
Advanced Power
Electronics Corp.
ELECTRICAL SPECIFICATIONS (Cont.)
APU8850
Unless otherwise specified, these specifications apply over C
IN
=C
O
=2.2F, I
O
=100uA, V
IN(MIN)
=4.5V, C
BYP
=470pF
(for fixed voltage devices), V
EN
=2V and T
A
=25
o
C. Typical values refer to T
A
=25
o
C. Low duty cycle pulse testing is used
which keeps junction and case temperatures equal to the ambient temperature.
Parameter
Enable Pin Input LO Current
Enable Pin Input HI Current
Ripple Rejection
Over Temperature Shutdown
Over Temperature Shutdown Hysteresis
SYM
TEST CONDITION
V
EN(L)
=0V
V
EN(H)
=2V
MIN
-
-
-
-
-
TYP
0.01
10
70
150
10
MAX
-
-
-
-
-
UNITS
uA
uA
dB
o
o
PSRR
C
BYP
=1nF, C
OUT
=2.2uF, f
RIPPLE
= 1kHz
C
C
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.
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
VIN
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.
GND
EN
Adj (Adjustable only)
C
BYP
(Fixed only)
VOUT
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.
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.
.
3
Advanced Power
Electronics Corp.
BLOCK DIAGRAM
VIN
1
5
VOUT
APU8850
ADJ
4
+
-
+
Thermal
Shutdown
Current
Limit
3
EN
GND
2
Figure 3 - APU8850Y5 Adjustable output block diagram.
VIN
1
5
VOUT
+
CBYP
4
+
Thermal
Shutdown
GND
2
Current
Limit
-
.
3
EN
Figure 4 - APU8850Y5 Fixed Mode output block diagram.
TYPICAL PERFORMANCE CHARACTERISTICS
PSRR (C
BYP
=1nF, C
OUT
=2.2uF, f
RIPPLE
= 1kHz)
4
Advanced Power
Electronics Corp.
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=5V，VEN=5V，VOUT=3.3V
3.37
3.36
Output Voltage
3.35
3.34
3.33
3.32
3.31
3.3
-40
-20
0
20
40
60
80
Iout=0mA
Iout=10mA
Iout=20mA
APU8850
Output Voltage VS. Temperature
100
Temperature(
℃
)
VIN=5V，VEN=5V，VOUT=3.3V
1.264
1.26
ADJ Voltage
1.256
1.252
1.248
1.244
1.24
-40
-20
0
20
40
60
80
100
Temperature(
℃
)
ADJ Voltage VS. Temperature
.
Iout=0mA
Iout=10mA
Iout=20mA
VIN=4.5V ,VOUT=3.3V IOUT=10mA~200mA
Load Transient
I
OUT
V
OUT
5
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