Advanced Power
Electronics Corp.
FEATURES
Input Voltage：2.6V to 5.5V
Dropout Voltage is 450mV at 1.5A Output
Current @ V
OUT
= 3.30V
Guaranteed 1.5A Output Current
Low Quiescent Current is 50µA (Typ.)
Fixed Output Voltage is form 1.2 V to 5V by 0.1V Steps.
Fast Transient Response
Current Limit and Thermal Shutdown Protection
Short Circuit Current Fold-back
Available in the 3-Pin Pb-Free SOT-223, TO-263,
TO-252, SOT-89 and SO-8 Packages
APE8970/A
DESCRIPTIOON
The APE8970/A is a low noise, high output
current, low quiescent current and low dropout linear
regulator. The Device includes pass element, error
amplifier, band-gap, current-limit and thermal shutdown
circuitry. The output current is up to 1.5A. The
characteristics of low dropout voltage and less
quiescent current make it good for some critical current
application, for example, some battery powered
devices. The typical quiescent current is approximately
50 µ A. Due to internal flexible design; result in
extensively fixed output voltage versions form 1.2V to
5V per 0.1V steps. Built-in current-limit, Short current
protection and thermal-shutdown functions prevent any
fault condition from IC damage.
1.5A HIGH OUTPUT CURRENT LDO REGULATOR
TYPICAL APPLICATION
1. For SOT-223/TO-252/TO-263/SOT-89 packages
APE8970/A
V
IN
VIN
VOUT
GND
V
OUT
C
IN
2.2uF
C
OUT
2.2uF
2. For SO-8 package
V
IN
C
IN
2.2uF
APE8970
VIN
EN
GND
V
OUT
VOUT
BP
C
OUT
2.2uF
10nF
ORDERING INFORMATION
APE8970X X-XX
Pin Define
Refer
Pin Assignment
Package
S : TO-263
H : TO-252
K : SOT-223
M : SO-8
G : SOT-89
Output voltage
12 : 1.2V
13 : 1.3V
50 : 5.0V
Data and specifications subject to change without notice
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201201174
Advanced Power
Electronics Corp.
PACKAGE INFORMATION
( Top View )
( Top View )
APE8970/A
APE8970
Tab is GND
APE8970
Tab is GND
APE8970A
Tab is VOUT
APE8970A
Tab is VOUT
( Top View )
EN
1
2
3
4
SO-8
8 GND
SOT-223
SOT-89
1
2
3
VIN GND VOUT
SOT-223
SOT-89
1
2
3
1
( Top View )
( Top View )
TO-252
2
GND
VIN
VOUT
3
1
TO-252
2
VOUT
GND
VIN
3
VIN
VOUT
BP
APE8970
7 GND
6 GND
5 GND
GND VOUT VIN
APE8970
Tab is GND
APE8970A
Tab is VOUT
TOP VIEW
TOP VIEW
TO-263
1
2
3
1
TO-263
2
3
GND
VIN
VOUT
VOUT
GND
VIN
ABSOLUTE MAXIMUM RATINGS
(at T
A
=25
o
C)
VIN Pin Voltage (V
IN
) --------------------------------------
GND - 0.3V to GND + 6.5V
OUTPUT Pin Voltage (V
OUT
) ----------------------------- GND - 0.3V to VIN + 0.3V
EN and BP Pin Voltage (V
EN
/V
BP
) ---------------------- GND - 0.3V to VIN + 0.3V
Power Dissipation (P
D
)
SOT-223------- 1.3W
TO-252--------- 2.2W
TO-263--------- 4W
SO-8------------ 1.4W
SOT-89--------
0.6W
Storage Temperature Range (T
ST
) --------------------- -40 to +150°C
Operating Temperature Range (T
OP
) ------------------ -40 to +85°C
Junction Temperature Range (T
J
) ---------------------
Thermal Resistance from Junction to Ambient (R
thja
)
-40 to +125°C
SOT-223------- 75°C/W
TO-252--------- 45°C/W
TO-263--------- 25°C/W
SO-8------------ 70°C/W
SOT-89--------
Thermal Resistance from Junction to Case (R
thjc
)
160°C/W
SOT-223------- 15
o
C/W
TO-252--------- 10
o
C/W
TO-263--------- 3.5
o
C/W
SO-8------------ 25
o
C/W
SOT-89--------
100°C/W
Note1 : R
thJA
is measured with the PCB copper area of approximately 1 in
2
(Multi-layer). That need connect to tap pin.
2
Advanced Power
Electronics Corp.
ELECTRICAL SPECIFICATIONS
(T
A
=25
o
C, unless otherwise specified)
Parameter
Input Voltage
APE8970/A
TEST CONDITION
I
OUT
=30mA
V
IN
=V
OUT
+0.1V to 5.5V
V
OUT
≧2.5V,
I
OUT
=1mA
V
IN
=2.6V to 5.5V
2.5V＞V
OUT
≧1.20V,
I
OUT
=1mA
I
OUT
=0mA, V
IN
=5V
I
OUT
=0mA, V
EN
=0V
V
OUT
=1.20V
V
OUT
=1.50V
SYM
V
IN
MIN
2.6
-2
TYP
-
-
MAX
5.5
2
UNITS
V
Output Voltage Accuracy
(Note1)
ΔV
OUT
%
-3
-
-
-
-
-
-
-
1.6
-
-
-
-
-
2
-
-
-
-
-
-
50
-
1.3
1
0.7
0.55
0.45
2
600
10
0.5
65
60
-
-
0.003
1
150
30
3
80
2
1.7
1.4
1.1
0.75
0.65
-
-
20
1
-
-
-
0.6
0.1
1.5
-
-
A
mA
mV
%
dB
V
μA
ºC
ºC
V
μA
μA
Quiescent Current
Shutdown Current
I
Q
I
SD
Dropout Voltage
V
DROP
I
OUT
=1.5A
V
OUT
=1.80V
V
OUT
=2.50V
V
OUT
=3.30V
Current Limit
(Note 2)
Short Circuit Current
Load Regulation
(Note 3)
Ripple Rejection
Enable Input Threshold (SO-8
only)
Enable Pin Current (SO-8 only)
Temperature Shutdown
Temperature Shutdown Hysterisis
I
LIMIT
I
SHORT
ΔVLOAD
PSRR
V
ENH
V
ENL
I
ENH
I
ENL
T
S
T
SH
Output Voltage < 0.25*V
OUT
I
OUT
=10m~1.5A
C
IN
=2.2uF, C
O
=2.2uF,
I
OUT
=10mA
Regulator Enable
Regulator Shutdown
V
EN
=V
IN
V
EN
=0V
2.0V＞V
OUT
2.0V≦V
OUT
F=120Hz
F=1KHz
Note1: Minimum VIN voltage is defined by output adds a dropout voltage.
Note2: Current limit is measured at constant junction temperature by using pulsed testing with a low ON time.
Note3: Regulation is measured at constant junction temperature by using pulsed testing with a low ON time.
PIN DESCRIPTIONS
PIN SYMBOL
EN
VOUT
VIN
BP
GND
PIN DESCRIPTION
Active-Low Shutdown Input. A logic low reduces the supply current to less than
2µA. Connect to VIN or Floating for normal operation. (SO-8 only)
Output Voltage
Input Voltage
Band-gap (SO-8 only)
Ground
3
Advanced Power
Electronics Corp.
BLOCK DIAGRAM
VIN
Error
Amp
VOUT
APE8970/A
Current
Limit
EN
Enable
- +
Bandgap
Thermal
Shutdown
GND
BP
FUNCTION DESCRIPTIONS
A minimum of 2.2 µ F capacitor must be connected from V
OUT
to ground to insure stability.
Typically a large storage capacitor is connected from V
IN
to ground to ensure that the input
voltage does not sag below the minimum dropout voltage during the load transient response. This
pin must always be dropout voltage higher than V
OUT
in order for the device to regulate properly.
APPLICATION INFORMATION
Like any low-dropout regulator, the APE8970/A requires input and output decoupling
capacitors. The device is specifically designed for portable applications requiring minimum board
space and smallest components. These capacitors must be correctly selected for good
performance. Please note that linear regulators with a low dropout voltage have high internal loop
gains which require care in guarding against oscillation caused by insufficient decoupling
capacitance.
Capacitor Selection
Normally, use a 2.2 µ F capacitor on the input and a 2.2 µ F capacitor on the output of the
APE8970/A. Larger input capacitor values and lower ESR (X5R, X7R) provide better supply-noise
rejection and transient response. A higher- value output capacitor (4.7 µ F) may be necessary if
large, fast transients are anticipated and the device is located several inches from the power
source.
Input-Output (Dropout) Voltage
A regulator's minimum input-to-output voltage differential (dropout voltage) determines the
lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life
battery voltage. Because the device uses a PMOS, its dropout voltage is a function of drain-to
source on-resistance, R
DS(ON)
, multiplied by the load current:
V
DROPOUT
= V
IN
-V
OUT
= R
DS(ON)
x I
OUT
4
Advanced Power
Electronics Corp.
Current Limit and Short-Circuit Protection
APE8970/A
The APE8970/A used a current sense-resistor to monitor the output current. A portion of the
PMOS output transistor’s current is mirrored to a resistor such that the voltage across this resistor
is proportional to the output current. Once the output current exceeds limit threshold, APE8970/A
would be protected with a limited output current. Further more, when the output is short to ground,
the output current would be folded-back to a less limit.
Thermal Considerations
The APE8970/A series can deliver a current of up to 1.5A over the full operating junction
temperature range. However, the maximum output current must be dated at higher ambient
temperature to ensure the junction temperature does not exceed 125 ° C. With all possible
conditions, the junction temperature must be within the range specified under operating
conditions. Power dissipation can be calculated based on the output current and the voltage drop
across regulator.
P
D
= (V
IN
- V
OUT
) I
OUT
The final operating junction temperature for any set of conditions can be estimated by the
following thermal equation:
P
D(MAX)
= (T
J(MAX)
- T
A
) / R
thJA
Where T
J(MAX)
is the maximum junction temperature of the die (125 ° C) and T
A
is the
maximum ambient temperature. The junction to ambient thermal resistance (R
thJA
) for SOT-223
package at recommended minimum footprint is 75°C/W (please refer Maximum rating table) that
is connected 1 in
2
PCB copper area to tap pin.
PCB Layout
An input capacitance of ~ 2.2µF is required between the APE8970/A input pin and ground
(the amount of the capacitance may be increased without limit), this capacitor must be located a
distance of not more than 1cm from the input and return to a clean analog ground. Input capacitor
can filter out the input voltage spike caused by the surge current due to the inductive effect of the
package pin and the printed circuit board’s routing wire. Otherwise, the actual voltage at the VIN
pin may exceed the absolute maximum rating. The output capacitor also must be located a
distance of not more than 1cm from output to a clean analog ground. Because it can filter out the
output spike caused by the surge current due to the inductive effect of the package pin and the
printed circuit board’s routing wire.
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