1A Bipolar Linear Regulator
Aug042017Ver10 1
Features
Maximum output current is 11A
Range of operation input voltage Max 30V
Line regulation 003V (typ)
Standby current 18mA (typ)
Load regulation 02A (typ)
Environment Temperature 20℃~85℃
Applications
Power Management for Computer Mother
Board Graphic Card
LCD Monitor and LCD TV
DVD Decode Board
ADSL Modem
Post Regulators For Switching Supplies
General Description
HE7110 is a series of low dropout threeterminal regulators
with a dropout of 13V at 1A load currentHE7110 features a
very low standby current 18mA compared to 5mA of
competitor
Other than a fixed version Vout 12V 18V 25V 285V
33V and 5V HE7110 has an adjustable version which
can provide an output voltage from 125 to 12V with only
two external resistors
HE7110 offers thermal shut down function to assure the
stability of chip and power system And it uses trimming
technique to guarantee output voltage accuracy within
2 Other output voltage accuracy can be customized on
demand such as 1
HE7110 is available in SOT89 power package
Typical Application
HE7110
Application circuit of HE7110 fixed version
Typical Electrical CharacteristicAug042017Ver10 2
Selection Table
Marking Part No Output Voltage Package
7110
XX YYWW
XX12 12V
SOT89
XX18 18V
XX28 285V
XX25 25V
XX33 33V
XX50 50V
XXAD Adj
Ordering Information
Marking Designator Description
7110
XX YYWW
7110 Product code
XX Output Voltage(12~120V)
YYWW DATE CODE
NoteXX stands for output voltages Other voltages can be specially customized
Parameters Description
Temperature & Rohs C40~85℃ Pb Free Rohs Std
Package type PSOT89
Packing type TR Tape & Reel (Standard)
Voltage accuracy 2(Customized)
Block Diagram
Pin Configuration
HE7110
1A Bipolar Linear RegulatorAug042017Ver10 3
Absolute Maximum Ratings
Max Input Voltage····································································································································· ·········· 30V
Max Operating Junction Temperature(Tj)····························································································· ·········· 150℃
Ambient Temperature(Ta)································································································· ······················ ·········· 40℃~ 85℃
Storage Temperature(Ts)························································································································ ·········· 40℃~150℃
Lead Temperature & Time································································································ ······················ ·········· 260℃ 10S
Caution Exceed these limits to damage to the device Exposure to absolute maximum rating conditions may affect
device reliability
Recommended Work Conditions
Recommended maximum input voltage················································································································ 30V
Recommended operating junction temperature(Tj)···························································································· 20~125℃
Thermal Information
Symbol Parameter Package Max Unit
θJA
Thermal Resistance (Junction to
Ambient) (Assume no ambient
airflow no heat sink)
SOT89 200 ℃W
PD Power Dissipation SOT89 050 W
HE7110
1A Bipolar Linear RegulatorAug042017Ver10 4
Electrical Characteristics
TA25℃ unless otherwise noted
Symbol Parameter Conditions Min Typ Max Unit
Vref Reference
voltage
HE7110Adj
10mA≤Iout≤1A Vin325V
1225 125 1275 V
Vout Output voltage
HE711012V
0≤Iout≤1A Vin32V
1176 12 1224 V
HE711018V
0≤Iout≤1A Vin38V
1764 18 1836 V
HE711025V
0≤Iout≤1A Vin45V
245 25 255 V
HE7110285V
0≤Iout≤1A Vin485V
2793 285 2907 V
HE711033V
0≤Iout≤1A Vin53V
3234 33 3366 V
HE711050V
0≤Iout≤1A Vin70V
49 5 51 V
△Vout Line
regulation
HE711012V
Iout10mA 27V≤Vin≤10V
003 02 V
HE7110ADJ
Iout10mA 275V≤Vin≤12V
003 02 V
HE711018V
Iout10mA 33V≤Vin≤12V
003 02 V
HE711025V
Iout10mA 40V≤Vin≤12V
003 02 V
HE7110285V
Iout10mA 435V≤Vin≤12V
003 02 V
HE711033V
Iout10mA 48V≤Vin≤12V
003 02 V
HE711050V
Iout10mA 65V≤Vin≤12V
003 02 V
HE711012V
Vin 27V 10mA≤Iout≤1A
2 8 mV
HE7110ADJ
Vin 275V 10mA≤Iout≤1A
2 8 mV
HE711018V
Vin 33V 10mA≤Iout≤1A
3 12 mV
HE7110
1A Bipolar Linear RegulatorAug042017Ver10 5
△Vout Load
regulation
HE711025V
Vin 40V 10mA≤Iout≤1A
4 16 mV
HE7110285V
Vin 435V 10mA≤Iout≤1A
5 20 mV
HE711033
Vin 48V 10mA≤Iout≤1A
6 24 mV
HE711050
Vin 65V 10mA≤Iout≤1A
9 36 mV
Vdrop Dropout voltage Iout 100mA 115 13 V
Iout1A 13 15 V
Imin Minimum load
current
HE7110ADJ 18 10 mA
Iq Quiescent
Current
HE711012VVin10V 18 5 mA
HE711018VVin12V 18 5 mA
HE711025VVin12V 18 5 mA
HE7110285VVin12V 18 5 mA
HE711033VVin12V 18 5 mA
HE711050VVin12V 18 5 mA
IAdj Adjust pin
current
HE7110ADJ
Vin5V10mA≤Iout≤1A
55 120 uA
Ichange Iadj change HE7110ADJ
Vin5V10mA≤Iout≤1A
02 10 uA
ΔVΔT Temperature
coefficien
±100 ppm
Note1 All test are conducted under ambient temperature 25°C and within a short period of time 20ms
Note2 Load current smaller than minimum load current of HE7110ADJ will lead to unstable or oscillation
output
HE7110
1A Bipolar Linear RegulatorAug042017Ver10 6
Detailed Description
HE7110 is a series of low dropout voltage three terminal regulators Its application circuit is very simple the fixed version
only needs two capacitors and the adjustable version only needs two resistors and two capacitors to work It is composed
of some modules including startup circuit bias circuit bandgap thermal shutdown 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
considerations The temperature coefficient is under 100 ppm°C And the accuracy of output voltage is guaranteed by
trimming technique
Typical Application
HE7110 has an adjustable version and six fixed versions (12V 18V 25V 285V 33V and
5V) Fixed Output Voltage Version
Application circuit of HE7110 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 HE7110ADJ
The output voltage of adjustable version follows the equation Vout125×(1+R2R1)+IAdj×R2 We can ignore
IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA)
HE7110
1A Bipolar Linear RegulatorHE7110
1A Bipolar Linear Regulator
Aug042017Ver10 7
1) To meet the minimum load current (>10mA) requirement R1 is recommended to be 125ohm or lower As
TX7110ADJ can keep itself stable at load current about 2mA R1 is not allowed to be higher than 625ohm
2) Using a bypass capacitor (CADJ) between the ADJ pin and ground can improve ripple rejection This bypass
capacitor prevents ripple from being amplified as the output voltage is increased The 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)
We have to take heat dissipation into great consideration when output current or differential voltage of input and output
voltage is large Because in such cases the power dissipation consumed by HE7110 is very large HE7110 series uses
SOT223 package type and its thermal resistance is about 20°CW And the copper area of application board can affect the
total thermal resistance If copper area is 5cm*5cm (two sides) the resistance is about 30°CW So the total
thermal resistance is about 20°CW + 30°CW We can decrease total thermal resistance by increasing copper area in
application board When 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 HE7110 could allow on itself is less than 1W And furthermore HE7110 will
work at junction temperature higher than 125°C under such condition and no lifetime is guaranteed
Typical Performance Characteristics
TA25℃ unless otherwise noted
Line regulation
Load regulation
Dropout voltage
Thermal performance with OTPAug042017Ver10 8
Package Information
3pin SOT89 Outline Dimensions
HE7110
1A Bipolar Linear Regulator
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