1117
1ABipolar Linear Regulator
Ver10 Jan 220131
Features
l Maximum output current is 1A
l Range of operation input voltageMax 12V
l Line regulation 01V(typ)
l Standby current 2mA(typ)
l Load regulation 10mV(typ)
l Environment Temperature20 C~85 C
Applications
l Power Management for Computer Mother
BoardGraphic Card
l LCDMonitor and LCDTV
l DVDDecode Board
l ADSLModem
l Post Regulators For Switching Supplies
GENERALDESCRIPTION
LD1117 is a series of low dropout threeterminal
regulators with a dropout of 13V at 1A load current
1117 features a very low standby current 2mA
compared to 5mA of competitor
Other than a fixed versionVout 12V 18V 25V 33V
5V and 12V 1117 has an adjustable version which
can provide an output voltage from 125 to 12V with only
two
external resistors
1117 offers thermal shut down and current limit
functions to assure the stability of chip and power system
And it uses trimming technique to guarantee output
voltage accuracy within 2Other output voltage
accuracy can be customized on demand such as 1
1117 is available in SOT223TO252 power package
TYPICALAPPLICATION
Application circuit of 1117 fixed version
TYPICALELECTRICALCHARACTERISTIC
LD
LD
LD
LD
LD
LD1117
LD1117
LD
1117
1ABipolar Linear Regulator
Ver10 Jan 220132
Selection Table
Marking Part NoOutput Voltage Package
XX12 12V
SOT223
TO252
XX18 18V
XX25 25V
XX33 33V
XX50 50V
XX120 120V
XXADAdjustable
ORDERINGINFORMATION
Marking Designator Description
LD1117A
1117 Product code
AFab Code
XXOutput Voltage(12~120V)
YYLOTNO
ZZDATACODE
NoteXX stands for output voltagesOther voltages can be specially customized
Parameters Description
Temperature&Rohs C40~85℃ Pb Free Rohs Std
Package type LSOT223
OTO252
Packing typeTRTape&Reel (Standard)
Voltage accuracy 1(Customized)
LD
XXYYZZ
LD1117A
XXYYZZ
Ver10 Jan 220133
Block Diagram
PINCONFIGURATION
Absolute Maximum Ratings
Max Input
Voltage ……………………………………………………
15V
Max Operating Junction Temperature(Tj)……………
150℃
Ambient Temperature(Ta)……………………………40
℃~ 85℃
Storage Temperature(Ts)…………40℃~150℃
Lead Temperature &Time ………… 260℃ 10S
CautionExceed these limits to damage to the deviceExposure to absolute maximum rating conditions may affect
device reliability
RECOMMENDEDWORKCONDITIONS
Recommended maximum input
voltage………………………………………………………………………………………………………… 12V
1ABipolar Linear Regulator
1117LDVer10 Jan 220134
Recommended operating junction
temperature(Tj)………………………………………………………………………………20~125℃
Exceptional for 12V the maximum input voltage for 12V is 20V
Thermal Information
Parameter Package Rating Unit
Package thermal
resistance
SOT223 20 ℃W
TO252 125 ℃W
Electrical Characteristics
Tj25℃
Symbol Parameter Conditions Min Typ Max Unit
Vref Reference
voltage
1117ADJ
10mA≤ Iout≤ 1A
Vin325V
1225 125 1275 V
Vout Output
voltage
111712V
0≤ Iout≤ 1A
Vin32V
1176 12 1224 V
111718V
0≤ Iout≤ 1A
Vin38V
1764 18 1836 V
111725V
0≤ Iout≤ 1A
Vin45V
245 25 255 V
111733V
0≤ Iout≤ 1A
Vin53V
3234 33 3366 V
111750V
0≤ Iout≤ 1A
Vin70V
49 5 51 V
1117120V
0≤Iout≤1AVin14V
1176 12 1224 V
△Vout Line
111712V
Iout10mA 27V≤Vin≤10V
01 02 V
1117ADJ
Iout10mA 275V≤Vin≤12V
01 02 V
111718V
Iout10mA 33V≤Vin≤12V
01 02 V
111725V
Iout10mA 40V≤Vin≤12V
01 02 V
1ABipolar Linear Regulator
LD1117A LD1117A
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
LD
1117LDVer10 Jan 220135
regulation 111733V
Iout10mA 48V≤Vin≤12V
01 02 V
111750V
Iout10mA 65V≤Vin≤12V
01 02 V
111718V
Iout10mA 135V≤Vin≤20V
01 02 V
△Vout Load
regulation
111712V
Vin 27V 10mA≤Iout≤1A
10 30 mV
1117ADJ
Vin 275V 10mA≤Iout≤1A
10 30 mV
111718V
Vin 33V 10mA≤Iout≤1A
10 30 mV
111725V
Vin 40V 10mA≤Iout≤1A
10 30 mV
111733
Vin 48V 10mA≤Iout≤1A
10 30 mV
111750
Vin 65V 10mA≤Iout≤1A
10 30 mV
1117120V
Vin 135V 10mA≤Iout≤1A
10 30 mV
Vdrop Dropout
voltage
Iout 100mA 123 13 V
Iout1A 13 15 V
Ilimit Current limit VinVout2VTj 25℃ 1 A
Imin Minimum load
current
1117ADJ 2 10 mA
Iq Quiescent
Current
111712VVin10V 2 5 mA
111718VVin12V 2 5 mA
111725VVin12V 2 5 mA
111733VVin12V 2 5 mA
111750VVin12V 2 5 mA
1117120VVin20V 2 5 mA
IAdj Adjust pin
current
1117ADJ
Vin5V10mA≤Iout≤1A
55 120 uA
Ichange Iadj change 1117ADJ
Vin5V10mA≤Iout≤1A
02 10 uA
ΔVΔTTemperature
coefficien
±100 ppm
LD
LD
LD
1ABipolar Linear Regulator
LD
LD
LD
LD
LD
LD
LD
LD
LD
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LD

1117LDVer10 Jan 220136
θJC
Thermal
resistance
SOT223 20
℃WTO252 10
TO220 45
Note1All test are conducted under ambient temperature 25°C and within a short period of time 20ms
Note2Load current smaller than minimum load current of LD1117ADJ will lead to unstable or oscillation output
1ABipolar Linear Regulator
1117LDVer10 Jan 220137
DETAILEDDESCRIPTION
1117 is a series of low dropout voltage three terminal regulatorsIts application circuit is very simple the fixed version
only needs two capacitors and the adjustable version only needs two resistors and two capacitors to workIt is composed
of some modules including startup circuit bias circuit bandgap thermal shutdown current limit power transistors and its
driver circuit and so on
The thermal shut down modules can assure chip and its application system working safety when the junction temperature
is larger than 140°C
The bandgap module provides stable reference voltage whose temperature coefficient is compensated by careful design
considerationsThe temperature coefficient is under 100 ppm°CAnd the accuracy of output voltage is guaranteed by
trimming technique
TYPICALAPPLICATION
1117 has an adjustable version and six fixed versions (12V 18V 25V 33V 5V and 12V)
Fixed Output Voltage Version
Application circuit of fixed version
1)Recommend using 10uF tan capacitor as bypass capacitor (C1) for all application circuit
2)Recommend using 10uF tan capacitor to assure circuit stability
Adjustable Output Voltage Version
Application Circuit of LD1117ADJ
The output voltage of adjustable version follows the equationVout125×(1+R2R1)+IAdj×R2We can ignore
IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA)
1)To meet the minimum load current (>10mA) requirementR1 is recommended to be 125ohm or lowerAs
LD1117ADJ can keep itself stable at load current about 2mAR1 is not allowed to be higher than 625ohm
1ABi olar Linear Re ulator
LD
LD
1117LD
1117LD
1117LD

1117LDVer10 Jan 220138
2)Using a bypass capacitor (CADJ) between the ADJ pin and ground can improve ripple rejectionThis bypass
capacitor prevents ripple from being amplified as the output voltage is increasedThe impedance of CADJ should be less
than R1 to prevent ripple from being amplifiedAs R1 is normally in the range of 100Ω~500Ω the value of CADJ
should satisfy this equation 1(2π×fripple×CADJ)THERMALCONSIDERATIONS
We have to take heat dissipation into great consideration when output current or differential voltage of input
and output voltage is largeBecause in such cases the power dissipation consumed by LD1117 is very large 1117
series uses SOT223 package type and its thermal resistance is about 20°CWAnd the copper area of application board
can affect the total thermal resistanceIf copper area is 5cm*5cm (two sides) the resistance is about 30°CWSo the
total
thermal resistance is about 20°CW + 30°CWWe can decrease total thermal resistance by increasing copper area in
application boardWhen there is no good heat dissipation copper are in PCB the total thermal resistance will be as high
as 120°CW then the power dissipation of 1117 could allow on itself is less than 1WAnd furthermore 1117 will
work at junction temperature higher than 125°C under such condition and no lifetime is guaranteed
TYPICALPERFORMANCECHARACTERISTICS
T25°C unless specified
Line regulation
Load regulation
Dropout voltage
Thermal performance with OTP
1ABi olar Linear Re ulator
LD
LD LD
1117LD
1117LD

1117LDVer10 Jan 22013
PACKAGEOUTLINE
1ABi olar Linear Re ulator
9

1117LDVer10 Jan 2201310
1ABi olar Linear Re ulator
1117LD

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