Advanced Power
Electronics Corp.3A HIGH OUTPUT CURRENT LDO REGULATOR
FEATURE
S
DESCRIPTION
Input Voltage：2.6V to 5.5V
Adjustable Output (ESOP-8 & TO-263-5LOnly) and
Fixed Output Voltage for 1.5V, 1.8V, 2.5V and 3.3V
Dropout Voltage is 380mV at 3A Output Current
Guaranteed 3A Output Current
Low Quiescent Current is 200µA (typ.)
Fast Transient Response
Short Circuit Current Fold-back
Available in the TO-220, SOT-223, TO-252, TO-263
and TO-263-5L and ESOP-8 Pb-Free packages
Data and specifications subject to change without notice 201203141
APE8975/A
TYPICAL APPLICATION
1
Current Limit and Thermal Shutdown Protection
The APE8975/A is a low noise, high output current, lo
w
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 3A. 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 200 µ A. There are 1.5V, 1.8V, 2.5V, 3.3V
fixed output voltage and adjustable output versions (ESOP-8
& TO-263-5L Only). Built-in current-limit, Short current
protection and thermal-shutdown functions prevent any fault
condition from IC damage.
VIN VOUT
GND
IN
C
VIN
OUT
C
APE8975/A
10uF 10uF
OUT
V
VIN VOUT
GND
IN
C
VIN
APE8975MP
10uF
OUT
V
FB
EN
ON
OFF
NC
R1
R2
OUT
C
10uF
VOVT = VFB × (1+R1/R2)
VFB = 0.8V
R2 Range = 50K ~ 300K
VIN VOUT
GND
CIN
VIN
COUT
APE8975S5
10uF 10uF
VOUT
EN
ON
OFF FB R1
R2
Advanced Power
Electronics Corp. APE8975/A
ABSOLUTE MAXIMUM RATINGS (at TA=25oC)
Input Voltage (VIN) ------------------------------------------
-
GND - 0.3V to 6V
Output Voltage (VUOT) -------------------------------------
-
GND - 0.3V to VIN + 0.3V
EN Pin Voltage (VEN) --------------------------------------
-
GND - 0.3V to 6V
FB Pin Voltage (VFB) ---------------------------------------
-
GND - 0.3V to 6V
Power Dissipation (PD) ------------------------------------
-
Internally Limited
Storage Temperature Range (TST) ---------------------
-
-40°C To 150°C
Operating Temperature Range (TOP) ------------------
-40°C To + 85°C
Junction Temperature Range (TJ) ----------------------
-
-40°C To + 125°C
Thermal Resistance from Junction to case (Rthjc)
SOT-223 15°C/W
ESOP-8 15°C/W
TO-263 3.5°C/W
TO-252 10°C/W
TO-220 3.5°C/W
SOT-223 75°C/W
ESOP-8 40°C/W
TO-263 25°C/W
TO-252 45°C/W
TO-220 25°C/W
Note: Rthja is measured with the PCB copper area of approximately 1in2 (Multi-layer).
That need connect to tap or exposed pad (ESOP-8 only) pin.
ORDERING/PACKAGE INFORMATION
Fixed Version ADJ Version
2
Thermal Resistance from Junction to ambient (Rthja)
VIN GND VOUT
Tab is GND
( Top View )
32
1
Tab is VOUT
APE8975K APE8975AK
( Top View )
32
1
VINGND VOUT
SOT-223 SOT-223
321
VIN VOUT
GND
Tab is GND
TOP VIEW
APE8975S
321
VIN
VOUT
GND
Tab is VOUT
TOP VIEW
APE8975AS
TO-263 TO-263
VIN
VOUT
GND
Tab is VOUT
APE8975AH
VIN VOUT
GND
Tab is GND
APE8975H
TO-252 TO-252
321
(Top
View )
321
(Top
View )
VIN
( Top View )
1
2
3
4
8
7
6
5
NC
ESOP-8
NC
EN
GND
FB
NC
VOUT
APE8975MP
(GND)
Tab is GND
3
VIN
21
VOUT
GND
(Top View)
APE8975P Tab is VOUT
3
VIN
21
VOUT
GND
(Top View)
APE8975AP
TO-220 TO-220
APE8975X X - XX
K : SOT-223
H : TO-252
P : TO-220
S : TO-263
Output voltage
Package
15 : 1.5V
18 : 1.8V
25 : 2.5V
33 : 3.3V
Refer
Pin Assignment
Pin Define
APE8975X
MP : ESOP-8
S5 : TO-263-5L
Package
APE8975S5 TO-263-5L
(Top View)
3 GND
1EN
2VIN
5FB
4VOUT
Metal
Tab
GND
Advanced Power
Electronics Corp. APE8975/A
ELECTRICAL SPECIFICATIONS
(VIN = 5V, TA = 25°C (unless otherwise noted))
Parameter SYM TEST CONDITION MIN TYP MAX UNITS
Input Voltage VIN IOUT=30mA (Note1) 2.6 - 5.5 V
Output Voltage Accuracy ∆VOUT IOUT=1mA (Note1) -2 - 2 %
Feedback Voltage (ESOP-8 Only) VFB IOUT = 1mA 0.784 0.8 0.816 V
FB Input Leakage Current
(ESOP-8 Only)
Quiescent Current IQIOUT =0mA, VIN=5V - 200 300 μA
Shutdown Current ISTB For TO-263-5L and ESOP-8 Only - 2 5 uA
VOUT=1.50V - 1.2 1.5
VOUT=1.80V - 0.9 1.2
VOUT=2.50V - 0.57 0.7
VOUT=3.30V - 0.38 0.6
Current Limit (Note 2) ILIMIT 3.3 4 - A
Short Circuit Current Ishort Output Voltage < 0.25 x VOUT -1- A
Load Regulation (Note 3) ∆VLOAD IOUT =10m~3A - 15 30 mV
VENH Regulator Enable 2 - -
VENL Regulator Shutdown - - 0.6
IENH VEN=VIN - 0.003 0.1
IENL VEN=0V - 2 4
F=120Hz - 65 -
F=1KHz - 55 -
Temperature Shutdown TS - 140 - oC
Temperature Shutdown Hysterisis TSH - 30 - oC
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 PIN DESCRIPTION
FB Feedback Pin
EN Enable Pin Input
VIN Input Voltage
VOUT Output Voltage
GND Ground Pin
NC No Connect Pin
Dropout Voltage
3
- 100 nA
VDROP
Ripple Rejection PSRR
Enable Pin Current
Enable Input Threshold
IFB VFB=0.8V -100
V
V
μA
dB
IOUT=3A
CIN=10uF,CO=10uF,
IOUT =10mA
Advanced Power
Electronics Corp. APE8975/A
BLOCK DIAGRAM
FUNCTION DESCRIPTIONS
Enable Function
FB Function (ESOP-8 & TO-263-5L only)
VOUT = 0.8 x (1 + R1/R2)
4
Current
Limit -+
VIN VOUT
GND
Error
Amp
Bandgap
Thermal
Shutdown
Enable
EN
SENSE
Fixed Version
Current
Limit -
+
VIN VOUT
GND
Error
Amp
Bandgap
Thermal
Shutdown
Enable
EN FB
Adjustable Version
A minimum of 10µF capacitor must be connected from VOUT to ground to insure
stability. Typically a large storage capacitor is connected from VIN 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 VOUT in orde
r
for the device to regulate properly.
The APE8975/A (TO263-5L and SOP-8L-EP only) features an LDO regulato
r
enable/disable function. To assure the LDO regulator will switch on; the EN turn on
control level must be greater than 2.0 volts. The LDO regulator will go into the
shutdown mode when the voltage on the EN pin falls below 0.6 volts. If the enable
function is not needed in a specific application, it can be floating.
The output is an adjustable version, the FB voltage is 0.8V. The output voltage
can be set by outside resistances. The output voltage, VOUT, is then given by the
fll i ti
For the reasons of reducing power dissipation and loop stability, R2 is
recommendin
g
to choose 50K~300KΩ.
Advanced Power
Electronics Corp. APE8975/A
APPLICATION INFORMATION
Capacitor Selection
Input-Output (Dropout) Voltage
Current Limit and Short-Circuit Protection
Thermal Considerations
5
The APE8975/A series can deliver a current of up to 3A over the full operating
j
unction 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.
PD = (VIN - VOUT) IOUT
The final operating junction temperature for any set of conditions can be
estimated by the following thermal equation :
PD (MAX) = (TJ (MAX) - TA) / θJA
Where TJ (MAX) is the maximum junction temperature of the die (125oC) and TAis
the maximum ambient temperature. The junction to ambient thermal resistance (θJA)
for SOT-223 package at recommended minimum footprint is 75°C/W that is connect 1
in2 PCB copper area to tap pin.
Like any low-dropout regulator, the APE8975/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 (see Capacitor Characteristics Section).
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.
Normally, use a 10µF capacitor on the input and a 10µF capacitor on the output
of the APE8975/A. Larger input capacitor values and lower ESR (X5R, X7R) provide
better supply-noise rejection and transient response. A higher- value output capacito
r
may be necessary if large, fast transients are anticipated and the device is located
several inches from the power source.
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, RDS (ON), multiplied by
the load current:
VDROPOUT = VIN -VOUT = RDS
(
ON
)
x IOUT
The APE8975/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, AX6639/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.
Advanced Power
Electronics Corp. APE8975/A
APPLICATION INFORMATION
PCB Layout
6
An input capacitance of ~10µF is required between the APE8975/A input pin and
ground (the amount of the capacitance may be increased without limit), this capacito
r
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.
Advanced Power
Electronics Corp. APE8975/A
TYPICAL PERFORMANCE CHARACTERISTICS
7
0
50
100
150
200
250
300
2.533.544.555.56
VIN VS ICCQ
VIN (V)
ICCQ (uA)
IOUT=0A
Advanced Power
Electronics Corp. APE8975/A
TYPICAL PERFORMANCE CHARACTERISTICS
8
Power-ON (VIN=5V, VOUT=3.3V, IOUT=2A)
Load Transient
0
50
100
150
200
250
300
350
400
-40℃ -20℃ 0℃ 25℃ 50℃ 85℃ 105℃ 125℃
Temperaute VS ICCQ
Temperature(℃)
ICC
Q(
uA
)
VIN=5V
IOUT=0A
Advanced Power
Electronics Corp. APE8975/A
MARKING INFORMATION
ESOP-8
TO-263-5L
SOT-223
9
8975MP
YWWSSS
Part Numbe
r
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
Package Code
Logo
Part Number
Package Code
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
8975S5
YWWSSS
8975XK-&&
YWWSSS
Part Number
Package Code
Refer Pin Assignment
Output Voltage :
15 : 1.5V ; 18 : 1.8V
25 : 2.5V ; 33 : 3.3V
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
Advanced Power
Electronics Corp. APE8975/A
MARKING INFORMATION
TO-252
TO-220
10
8975XH-&&
YWWSSS
Part Number
Package Code
Refer Pin Assignment
Output Voltage :
15 : 1.5V ; 18 : 1.8V
25 : 2.5V ; 33 : 3.3V
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
Logo
8975XP-&&
YWWSSS
Part Number
Package Code
Refer Pin Assignment
Output Voltage :
15 : 1.5V ; 18 : 1.8V
25 : 2.5V ; 33 : 3.3V
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
Logo