ACE1085G - ACE Technology Co., LTD.

ACE1085G
3A Low Dropout Linear Regulator
Description
The ACE1085G is a low dropout positive adjustable or fixed-mode regulator with minimum of 3A output
current capability. The product is specifically designed to provide well-regulated supply for low voltage IC
applications such as high-speed bus termination and low current 3.3V logic supply. ACE1085G is also well
suited for other applications such as VGA cards. ACE1085G is guaranteed to have <1.4V dropout at full
load current making it ideal to provide well-regulated outputs of 1.25 to 5.0V with 4.7 to 12V input supply
by different output voltage.
Features
● 3-Terminal Adjustable ofr fixed 1.5V,1.8V,2.5V,3.3V,5.0V
● 1.4V Maximum Dropout at Full Load current
● Fast Transient response
● Built-in Thermal Shutdown
● Output current limiting
Absolute Maximum Ratings
Parameter
Symbol Ratings
DC Supply Voltage
VIN
Power Dissipation
PD
Storage Temperature
TST
Operating Junction Temperature Range
TOP
-0.3 to 12
Unit
V
Internally Limited
-65 ~ 150
O
C
0 ~ 150
O
C
Packaging Type
TO-252
1
2
Adjustable Version
TO-252
Description
Function
1
ADJ
Adjustable
2
Vout
Output
3
Vin
Input
3
Ordering information
ACE1085G XX XX + H
Halogen - free
Pb - free
YM : TO-252
Output Voltage :
1.5V / 1.8V / 2.5V ….. 5.0V / Default: Adjustable Version
VER 1.5
1
ACE1085G
3A Low Dropout Linear Regulator
Block Diagram
Electrical Characteristics
Parameter
Reference Voltage
ACE1085G
ACE1085G-15
ACE1085G-18
Output Voltage
ACE1085G-25
ACE1085G-33
ACE1085G-50
Line Regulator
ACE1085GXXX
ACE1085G
ACE1085G-15
ACE1085G-18
Load Regulation
ACE1085G-25
ACE1085G-33
ACE1085G-50
Dropout Voltage
(Vin-Vout)
Current Limit
Conditions
Io=10mA, TJ =25,
(Vin-Vout )=1.5V
Io=10mA, TJ =25,
3V≦Vin≦12V
Io=10mA, TJ =25,
3.3V≦Vin≦12V
Io=10mA, TJ =25,
4V≦Vin≦12V
Io=10mA, TJ =25,
4.8V≦Vin≦12V
Io=10mA, TJ =25,
6.5V≦Vin≦12V
Min
Io=3A(Vout=1% Vout)
ACE1085GXXX
Vin-Vout=5V
Max
Unit
1.225 1.250 1.275
V
1.470 1.500 1.530
V
1.764 1.800 1.836
V
2.450 2.500 2.550
V
3.235 3.300 3.365
V
4.900 5.000 5.100
V
Io=10mA, Vout+1.5<Vin<12
Vin=3.3V, 0mA<Io<3A,
TJ=25(Note 1,2)
Vin=3.0V, 0mA<Io<3A,
TJ=25(Note 1,2)
Vin=3.3V, 0mA<Io<3A, TJ
=25(Note 1,2)
Vin=4.0V, 0mA<Io<3A,
TJ=25(Note 1,2)
Vin=5.0V, 0mA<Io<3A,
TJ=25(Note 1,2)
Vin=8.0V, 0mA<Io<3A,
TJ=25(Note 1,2)
ACE1085GXXX
Typ
0.2
%
1
%
12
15
mV
15
18
mV
20
25
mV
26
33
mV
40
50
mV
1.3
1.4
V
3.1
A
VER 1.5
2
ACE1085G
3A Low Dropout Linear Regulator
Minimum Load
Current
Adjust Pin Current
Quiescent Current
Adjustable model
Vin=5V
5
10
mA
Adjustable model
Vin=12V, Io=10mA
55
100
μA
Fixed model
Vin=12V, Io=0mA
12
mA
0.008
0.04
%W
60
70
dB
Thermal Regulation
Ripple Rejection
TA=25℃, 30ms pulse
F=120Hz,COUT=25μF, Tantalum, IO=3A
ACE1085GXXX
Temperature
Stability
Thermal Resistance
Junction–to-Ambient
(No heat sink ;No air
flow)
Thermal Resistance
Junction-to-Case
Vin=Vout+3V
IO=10mA
Control Circuitry / Power Transistor
0.5
%
98
℃
/W
15
℃
/W
Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are
measured at a constant junction Temperature by low duty cycle pulse testing. Load regulation is measured at the output
lead =1/18” from the package.
Note 2: Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by
the difference in input and output and the output current. Guaranteed maximum power dissipation will not be available
over the full input/output range.
Functional Description
Introduction
The ACE1085G adjustable or fixed-mode Low Dropout (LDO) regulator is a 3 terminal device which can
easily be programmed by internal mask change to any voltage within the range of 1.25 to Vin-1.4V. The
ACE1085G only needs 1.4V differential between Vin and Vout to maintain output regulation, in addition,
the output voltage tolerances are also extremely tight and they include the transient response as port of the
specification. For example, Intel VRE specification calls for a total of ±100mV including initial tolerance,
load regulation and 0 to 3A load step. The ACE1085G 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 output capacitors.
Load Regulation
Since the ACE1085G is only a 3 terminal device, it is not possible to provide true remote sensing of the
output voltage at the load. But it can supply good load regulation by internal feedback bypass the external
loss such as adjustable mode.
Stability
The ACE1085G requires the use of an output capacitor as part of the frequency compensation in order to
make the regulator stable .For most applications a minimum of 10uF aluminum electrolytic capacitor
insures both stability and good transient response.
VER 1.5
3
ACE1085G
3A Low Dropout Linear Regulator
Thermal Design
The ACE1085G incorporates an internal shutdown that protects the device when the junction
temperature exceeds the maximum allowable junction temperatures. Although this device can operate
with junction temperatures in the range of 150℃, it is recommended that the selected heat sink be chosen
such that during maximum continuous load operation the junction temperature is kept below the
temperature.
Layout Consideration
The output capacitors must be located as close to the Vout terminal of the device as possible .It is
recommended to use a section of a layer of the PC board as a plane to connect the Vout pin to the output
capacitors to prevent any high frequency oscillation that may result due to excessive trace inductance.
Typical Circuit
5V to 3.3V Fixed Mode Regulator
Adjustable Regulator
Note: VO = VREF * (1+R2/R1)
VER 1.5
4
ACE1085G
3A Low Dropout Linear Regulator
Typical Performance Characteristic
Dropout Voltage VS. Output Current
Output Current (A)
Percent Change in Output Voltage vs Temperature
Temperature (℃)
Load Transient Response
Time (μs)
Load Regulation vs Temperature
Temperature (℃)
Line Regulation
Input Voltage (V)
Load Transient Response
Time (μs)
VER 1.5
5
ACE1085G
3A Low Dropout Linear Regulator
Packing Information
TO-252
VER 1.5
6
ACE1085G
3A Low Dropout Linear Regulator
Notes
ACE does not assume any responsibility for use as critical components in life support devices or systems
without the express written approval of the president and general counsel of ACE Electronics Co., LTD.
As sued herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and shoes failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in
a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can
be reasonably expected to cause the failure of the life support device or system, or to affect its safety
or effectiveness.
ACE Technology Co., LTD.
http://www.ace-ele.com/
VER 1.5
7