ACE1117 Datasheet PDF - ACE Technology

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ACE1117
ACE Technology

Part Number ACE1117
Description 1A Positive Voltage Regulators
Page 8 Pages


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ACE1117                                                                                                                                                                           
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1A Positive Voltage Regulators
Description
ACE1117 series of high performance low dropout voltage regulators are designed for applications that
require efficient conversion and fast transient response.
In addition, ACE1117 is designed to be stable under conditions where Cin and Cout are not present.
However, it is recommended to include Cin and Cout in the system design as this will speed up the
transient response and increase the PSRR rating.
Features
Low Dropout Performance.
Low Quiescent Current: 3mA (Typ.)
Guaranteed 1A Output Current.
Wide input Supply Voltage Range.
Stable operation without Cin and Cout.
Over-temperature and Over-current Protection
Fixed or Adjustable Output Voltage.
Rugged 2KV ESD withstand capability.
Available in SOT-223 and TO-252 Packages.
RoHS Compliant and 100% Lead (Pb)-Free
Application
Active SCSI Terminators
High Efficiency Linear Regulators
5V to 3.3V Linear Regulators
Motherboard Clock Supplies
Absolute Maximum Ratings
Parameter
Symbol Max Unit
Input voltage
VIN 9 V
Junction temperature
TJ -40 to 130 OC
Thermal Resistance Junction to Ambient θJA
60 OC/W
Storage temperature
TS - 40 to 150 OC
Packaging Type
SOT-223
TO-252
123
123
Pin Symbol
1 ADJ/GND
2 Vout
3 Vin
VER 1.3 1 



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ACE1117                                                                                                                                                                           
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1A Positive Voltage Regulators
Ordering information
Selection Guide
ACE1117 XX XX + H
Halogen - free
Pb - free
XM : SOT-223
YM : TO-252
Output Voltage :
1.5 / 1.8V / 2.5V / 3.3V….. 5.0V / Default: Adjustable Version
Electrical Characteristics
VIN.MAX8V, VIN.MAX-VOUT=1.5V, IOUT=10mA, CIN=10uF, COUT=22uF, TA=25, unless otherwise specified.
Parameter
Symbol
Test Conditions
Min Typ
ACE1117-15
1.470 1.5
Output Voltage (1)
VO
ACE1117-18
ACE1117-25
ACE1117-33
1.764
2.450
3.234
1.8
2.5
3.3
Reference Voltage (1)
ACE1117-50
4.900 5.0
(ADJ. Voltage
Version)
VREF
(VIN-VOUT)=1.5V IOUT=10mA
(-2%) 1.250
Line Regulation (1)
Load Regulation (1)
Quiescent Current (2)
Adjust Pin Current
Adjust Pin Current
Change
Dropout Voltage (3)
Minimum Load
Current
VSR
VLR
IQ
IADJ
IADJ
VD
IO
VOUT+1.5V<VIN<8V IOUT=10mA
(VIN-VOUT)=1.5V 10mAIOUT1A
Fixed Output Version
VOUT+1.5V<VIN<8V 10mAIOUT1A
IOUT=1A
0.3
0.5
3
65
14
1.3
0.4
Current Limit
Temperature
Coefficient
ICL
TC
1.8
0.07
Thermal Protection
OTP
175
RMS Output Noise
Ripple Rejection
Ratio
VN
RA
TA=25, 10Hzf100kHz
f=120Hz, COUT=22uF (Tantalum),
(VIN-VOUT)=3V, IOUT=10mA
0.003
55
Mum
1.530
1.836
2.550
3.366
5.100
(+2%)
Unit
V
V
%
%
mA
uA
uA
V
mA
A
%/
%VO
dB
VER 1.3 2



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ACE1117                                                                                                                                                                           
                                              Technology
1A Positive Voltage Regulators
Note1: Low duty cycle pulse testing with which TJ remains unchanged.
2: The IQ of ACE1117-1.5 is 1.2mA (Typ.)
3: The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input
Typical Application
Adjustable Voltage Regulator
Vin>=3.0V
Cin
10uF
ACE1117
Vin
ADJ
Vout
Vout=1.5V
R1
124ohm
R2
24.9ohm
Cout
22uF
VOUT=VREF * (1+R2/R1)+IADJ * R2
ACE1117-3.3
Fixed Voltage Regulator
Application Hints
The typical Linear regulator would require external capacitors to ensure stability. However, ACE1117 is
designed in such a way that these external capacitor can be omitted if the PCB layout is tight and system
noise is not very high. For better transient and PSRR performance, the Input and Output capacitors are still
recommended.
Input Capacitor
An input capacitor of 10μF is recommended. Ceramic or Tantalum can be used. The value can be
increased without upper limit.
VER 1.3 3



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ACE1117                                                                                                                                                                           
                                              Technology
1A Positive Voltage Regulators
Output Capacitor
An output capacitor of 22uF is recommended for better transient and PSRR performance. It should be
placed no more than 1 cm away from the VOUT pin, and connected directly between VOUT and GND pins.
The value may be increased without upper limit.
Thermal Considerations
It is important that the thermal limit of the package is not exceeded. The ACE1117 has built-in thermal
protection. When the thermal limit is exceeded, the IC will enter protection, and VOUT will be pulled to
ground. The power dissipation for a given application can be calculated as following:
The power dissipation (PD) is PD = IOUT * [VIN – VOUT]
The thermal limit of the package is then limited to PD(MAX) = [TJ – TA]/ΘJA where TJ is the junction
temperature, TA is the ambient temperature, and ΘJA is around 180°C/W for ACE1117. ACE1117 is
designed to enter thermal protection at 175°C. For example, if TA is 25°C then the maximum PD is limited
to about 0.83W. In other words, if IOUT(MAX) = 500mA, then [VIN – VOUT] can not exceed 1.66V. (Ref.
SOT-223 without heat sink.)
Typical Performance Characteristic
Reference Voltage vs Junction Temperature
Output Voltage vs Junction Temperature
 
Junction Temperature ()
Junction Temperature ()
VER 1.3 4



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