3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
APE1185
This datasheet contains new product information. Advanced Power Electronics Corp. reserves the rights to modify the product specification without notice. No liability is
assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
200926071-1/7
Feature
0.7V maximum dropout voltage at 3A load current
Built-in Thermal shutdown
Output current limiting
Adjustable or fixed output voltage 1.2V,
1.5V, 1.8V, 2.5V, 3.3V, 5.0V
Fast transient response
Good noise rejection
Packages: TO252-5L, TO220-5L and TO263-5L
General Description
APE1185 is a 3A regulator with extremely low
dropout voltage. This product is specifically
designed to provide well regulated supply for
applications requiring 2.8V or lower voltages from
3.3V ATX power supplies where high efficiency of
the switch can be achieved without the cost and
complexity associated with switching regulator. One
such application is the new graphic chipsets that
requires anywhere from 2.4V to 2.7V supply.
Ordering Information
APE1185 X - XX
Low Dropout Regulator Package Vout
H:TO252-5L
S:TO263-5L
P:TO220-5L
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Typical Application
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Electronics Corp.
Vctr1
Vin
VOUT
Vsense
GND 470uF
470uF
10uF
5V
3.3V
2.5V/3A
RoHS Compliant
12 = 1.2V
3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
APE1185
2/7
Block Diagram
THERMAL
SHUTDOWN
Vout
Adj
1.25V +
CURRENT
LIMIT
Vin
+-
+
+
-
Vsense
Vctrl
Pin Configuration
(APE1185S) (APE1185P)
Tab is Vout
FRONT VIEW
3
2
1
Vout
Vsense
Adj(GND)
Vctrl
Vin
4
5
Tab is Vout
FRONT VIEW
Vout
Vsense
Adj(GND)
Vctrl
Vin
5
2
1
4
3
( APE1185H )
Pin Descriptions
Name I/O Description
Adj
(GND) A resistor divider from this pin to the Vout pin and ground sets the output voltage.
(GND only for fixed mode)
Vsense I
This pin is the positive side of the reference that allows remote load sensing to
achieve excellent load regulation. A minimum of 10uF capacitor must be connected
from this pin to ground to insure stability.
Vin I
The input 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
dropout voltage during the load transient response. This pin must always be higher
than Vout in order for the device to regulate.
Vctrl I
This pin is the supply pin for the internal control circuit as well as the base drive for
the pass transistor. This pin must always by higher than the Vout pin in order the
device to regulate. A minimum of 100uF capacitor must be connected from this pin to
ground to insure stability.
Vout O
The output of the regulator. A minimum of 100uF capacitor must be connected from
this pin to ground to insure stability.
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Electronics Corp.
1 Vsense
4 Vctrl
3 Vout
2 Adj(GND)
5 Vin
FRONT VIEW
Metal
Tab
GND
Tab is Vout
(1.2V)
3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
APE1185
3/7
Absolute Maximum Ratings
Symbol Parameter Rating Unit
VIN Input Voltage 16 V
Vctrl Control Input voltage 18 V
PD Power dissipation Internally limited
TST Storage temperature Range -65 to +150 oC
TOP Operation Junction Temperature Range 0 to +150 oC
Electrical Characteristics
Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150oC. Typical value refer to Tj=25oC.
Vout=Vsense.
Sym. Parameter Test Condition Min. Typ. Max. Unit
VREF Reference Voltage APE1185-Adj Io=10mA, Tj=25oC, (Vin-Vout)=0.7V,
Vctrl=VIN+1V 1.225 1.250 1.275 V
Line Regulation APE1185-XX IO=10mA, VOUT+0.7V<VIN<12V, TJ =25oC
Vctrl=VIN+1V 0.5 %
APE1185-1.5 IOUT = 10mA, TJ = 25oC, 2.2VVIN12V
Vctrl=VIN+1V 1.470 1.500 1.530 V
APE1185-1.8 IOUT = 10mA, TJ = 25oC, 2.5VVIN12V
Vctrl=VIN+1V 1.764 1.800 1.836 V
APE1185-2.5 IOUT = 10mA, TJ = 25oC, 3.2VVIN12V
Vctrl=VIN+1V 2.450 2.500 2.550 V
APE1185-3.3 IOUT = 10mA, TJ = 25oC, 4.0VVIN12V
Vctrl=VIN+1V 3.235 3.300 3.365 V
Vout Output Voltage
APE1185-5.0 IOUT = 10mA, TJ = 25oC, 5.7VVIN12V
Vctrl=VIN+1V 4.900 5.000 5.100 V
APE1185-Adj 0mA<Io<3A, TJ =25oC
(VIN- VOUT)=2V ,Vctrl =VIN + 1V 1 %
APE1185-1.5 VIN=3V, 0mA<Io<3A, TJ =25oC
Vctrl=4V 12 15 mV
APE1185-1.8 VIN=3.3V, 0mA<Io<3A, TJ =25oC
Vctrl=4.3V 15 18 mV
APE1185-2.5 VIN=4V, 0mA<Io<3A, TJ =25oC
Vctrl=5V 20 25 mV
APE1185-3.3 VIN = 5V, 0mA<Io<3A, TJ=25oC
Vctrl=6V 26 33 mV
Load
Regulation
APE1185-5.0 VIN = 8V, 0mA<Io<3A, TJ=25oC
Vctrl=9V 40 50 mV
Dropout Voltage
(Vctrl –Vout)
Vadj=0V for all conditions below.
Vin=2.05V, Io=1.5A
Vin=2.05V, Io=2A
Vin=2.05V, Io=3A
1.25
1.15
1.25
1.40
V
Dropout Voltage
(Vin -Vout)
Vadj=0V for all conditions below.
Vctrl =2.75V, Io=1.5A
Vctrl =2.75V, Io=2A
Vctrl =2.75V, Io=3A
0.26
0.50
0.70
0.38
0.60
0.85
V
Current Limit Vctrl =2.75V, Vin=2.05V,Vo=100mV, Vadj=0V 3.5 A
Minimum Load
Current Vctrl =5V, Vin=3.3V, Vadj=0V 5 10 mA
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Electronics Corp.
APE1185-1.2 IOUT = 10mA, TJ = 25oC, 2.2VVIN12V
Vctrl=VIN+1V 1.176 1.200 1.224 V
APE1185-1.2 VIN=3V, 0mA<Io<3A, TJ =25oC
Vctrl=4V 10 12 mV
3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
APE1185
4/7
Electrical Characteristics(Continued)
Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150oC. Typical value refer to Tj=25oC.
Vout=Vsense.
Sym. Parameter Test Condition Min. Typ. Max. Unit
Thermal Regulation 30mS Pulse 0.01 0.02 %/W
Ripple Rejection Vctrl =5V, Vin=5V, Io=3A, Vadj=0V, Tj=25, Vripple=1Vpp at
120Hz 60 70 dB
Control Pin Current
Vadj=0V for all conditions below.
Vctrl =2.75V, Vin=2.05V, Io=1.5A
Vctrl =2.75V, Vin=2.05V, Io=2A
Vctrl=2.75V, Vin=2.05V, Io=3A
6
30
33
25
60
70
mA
Iadj Adjust Pin Current Vctrl=2.75V, Vin=2.05,Vadj=0 50 150 µA
JC
θ Thermal Resistance
Junction-to-Case
TO-263: Control Circuitry/Power Transistor
TO-220: Control Circuitry/Power Transistor
TO-252: Control Circuitry/Power Transistor
2.7
2.7
10
OC/W
OC/W
OC/W
NOTE:
APE1185-ADJ incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable
maximum junction temperature.
Functional Descriptions
Introduction
The APE1185 regulator is 5 terminal device designed
specifically to provide extremely low dropout
voltages comparable to the PNP type without the
disadvantage of the extra power dissipation due to
the base current associated with PNP regulators.
This is done by bringing out the control pin of the
regulator that provides the base current to the
power NPN and connecting it to a voltage that is
greater than the voltage present at the Vin pin. This
flexibility makes the APE1185 ideal for applications
where dual inputs are available such as a computer
motherboard with an ATX style power supply that
provides 5V and 3.3V to the board. One such
application is the new graphic chip sets that require
anywhere from 2.4V to 2.7V supply. The APE1185
can easily be programmed with the addition of two
external resistors to any voltages within the range
of 1.2V to 15.5V. Another major requirement of
these graphic chips is the need to switch the load
current from zero to several amps in tens of
nanoseconds at the processor pins, which
translates to an approximately 300 to 500ns of
current step at the regulator. In addition, the output
voltage tolerances are also extremely tight and they
include the transient response as part of the
specification.
The APE1185 is specifically designed to meet the
fast current transient needs as well as providing an
accurate initial voltage, reducing the overall system
cost with the need for fewer number of output
capacitors. Another feature of the device is its true
remote sensing capability that allows accurate
voltage setting at the load rather than at the device.
Output Voltage Setting
The APE1185-ADJ can be programmed to any
voltages in the range of 1.2V to 15.5V with the
addition of R1 and R2 external resistors according
to the following formula:
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3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
APE1185
5/7
Functional Descriptions(Continued)
Vout = Vref (1+R2/R1) + Iadj * R2 where : Vref = 1.25V & Iadj=50uA Typically
APE1185-ADJ
Vin
Vctrl Adj
Vout
Vsense
R1+
R2+
Vref
Iadj=50uA
The APE1185-ADJ keeps a constant 1.25V between
the Vsense pin and the Adj pin. By placing a
resistor R1 across these two pins and connecting
the Vsense ans Vout pin together, a constant
current flows through R1, adding to the Iadj current
and into the R2 resistor producing a voltage equal
to the (1.25/R1)*R2 + Iadj*R2. This voltage is then
added to the 1.25V to set the output voltage. This is
summarized in the above equation. Since the
minimum load current requirement of the
APE1185-ADJ is 10mA, R1 is typically selected to be
a 121Ω resistor so that it automatically satisfies
this condition. Notice that since the Iadj is typically
in the range of 50uA it only adds a small error to the
output voltage and should be considered when very
precise output voltage setting is required.
Load Regulation
Since the APE1185 has separate pins for the output
(Vout) and the sense (Vsense), it is ideal for
providing true remote sensing of the output voltage
at the load. This means that the voltage drops due
to parasitic resistance such as PCB traces between
the regulator and the load are compensated for
using remote sensing. Figure following shows a
typical application of the APE1185-ADJ with remote
sensing.
APE1185-ADJ
Vin
Vctrl
Vin
Vctrl
Vout
Vsense
Adj R1
R2
R
L
Stability
The APE1185-XX requires the use of an output
capacitor as part of the frequency compensation in
order to make the regulator stable. Typical designs
for the microprocessor applications use standard
electrolytic capacitors with typical ESR in the range
of 50 to 100mΩ and an output capacitance of
100uF to 1000uF. Fortunately as the capacitance
increases, the ESR decreases resulting in a fixed
RC time constant. The APE1185-XX takes
advantage of the phenomena in making the overall
regulator loop stable. For most applications a
minimum of 100uF aluminum electrolytic capacitor
insures both stability and good transient response.
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3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
APE1185
6/7
Performance Characteristic
Output Current (A)
V
control
Dropout Voltage vs Output Current
Vcontrol Dropout Voltage (mV)
800
900
1000
1100
1200
Vpower = 2.05 V
Tj = 20
o
C
Tj = 120
o
C
00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Output Current (A)
V
power
Dropout Voltage vs Output Current
0
Vpower Dropout Voltage (mV)
00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
Vcontrol = 2.75 V
Tj = 120
o
C
Tj = 20
o
C
Junction Temperature (
o
C)
Reference Voltage vs Junction Temperature
1. 247
1. 248
1. 249
1. 250
Reference Voltage (V)
1. 251
1. 252
1. 253
020 40 60 80 100 120
Output Current (A)
Load Regulation vs Output Current
Load Regulation (%)
0
0. 02
0. 04
0. 06
0. 08
0. 10
0. 12
0. 14
0. 15
Tj = 20
o
C
Tj = 120
o
C
00.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
Advanced Power
Electronics Corp.
3A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
APE1185
7/7
Performance Characteristic (continued )
Transient Response
Marking Information
1185X-XX
Y WW SSS
Logo
Part Number
SSS: Internal code ( Optional)
( Top View)
XX: Blank=adj,
12= 1.2V, 15= 1.5V
18= 1.8V, 25= 2.5V
33= 3.3V, 50= 5.0V
Y : Year : "1"=2001
"2"=2002
WW : Nth week : 01~52
~
( TO252-5L / TO220-5L / TO263-5L )
VCONTROL = 5.0V
VPOWER = 3.3V
VOUT = 2.5V
CCONTRROL=10uF
CPOWER = 100uF
CADJ = 0.1uF
COUT = 470uF
ILOAD
10mA to 3A
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Electronics Corp.
Package Code
Package Outline : TO-263-5L
Millimeters
MIN NOM MAX
A 4.40 4.60 4.80
b 0.66 0.79 0.91
L4 0.00 0.15 0.30
c 0.36 0.43 0.50
L1 2.29 2.54 2.79
E 9.80 10.10 10.40
E1
c2 1.25 1.35 1.45
L2
D 8.60 8.80 9.00
D1
e
L 14.60 15.20 15.80
1.All Dimensions Are in Millimeters.
2.Dimension Does Not Include Mold Protrusions.
Part Marking Information & Packing : TO-263-5L
θ
7.60
1.27
5.90
1.70
SYMBOLS
ADVANCED POWER ELECTRONICS CORP.
Part Numbe
r
1185S-XX
YWWSSS LOGO
Date Code (YWWSSS)
YLast Digit Of The Year
WWWeek
SSSSequence
Part Numbe
r
YWWSSS LOGO
YLast Digit Of The Year
WWWeek
SSSSequence
Output Voltage
Package Code
Package Outline : TO-252(5L)
Millimeters
MIN NOM MAX
A 6.40 6.6 6.80
B 5.2 5.35 5.50
C 6.80 7.00 7.20
D 2.20 2.50 2.80
P
S 0.50 0.65 0.80
E3 E3 3.50 4.00 4.50
G 0.40 0.50 0.60
H 2.20 2.30 2.40
J 0.45 0.50 0.55
K 0.00 0.075 0.15
L 0.90 1.20 1.50
M 5.40 5.60 5.80
1.All Dimensions Are in Millimeters.
2.Dimension Does Not Include Mold Protrusions.
Part Marking Information & Packing : TO-252(5L)
SYMBOLS
1.27 REF.
ADVANCED POWER ELECTRONICS CORP.
A
B
C
M
D
H
J
K
L
Part Number
1185H-XX
YWWSSS Date Code (YWWSSS)
YLast Digit Of The Year
WWWeek
SSSSequence
LOGO
G
SP
Output Voltage
Package Code
Package Outline : TO-220-5L
Millimeters
MIN NOM MAX
A4.07 4.45 4.82
b0.76 0.89 1.02
C0.36 0.50 0.64
D14.22 14.86 15.50
E9.78 10.16 10.54
e1.57 1.71 1.85
e1 6.68 6.81 6.93
F1.14 1.27 1.40
H1 5.46 6.16 6.86
J1 2.29 2.74 3.18
L13.21 13.97 14.73
3.68 3.81 3.94
2.54 2.73 2.92
1.All Dimensions Are in Millimeters.
2.Dimension Does Not Include Mold Protrusions.
Part Marking Information & Packing : TO-220-5L
Q
SYMBOLS
ADVANCED POWER ELECTRONICS CORP.
φp
YWWSSS
Part Number
LOGO 1185P-XX
Date Code (YWWSSS)
YLast Digit Of The Year
WWWeek
SSSSequence
Output Voltage
Package Code