RS73xx-1

300mA LOW POWER LDO
FEATURES•

Low Quiescent Current IQ：
3uA Typical at Light Loads•300mA Output Current•

Low Dropout Voltage•

Low Temperature Coefficient•High Input Voltage (up to 45V)

•Output Voltage Accuracy：±2%•

Fixed 1.8V、2.5V 、3.0V 、3.3V、3.6V
and 5V Output Voltage•

Over temperature protection and overcurrent protection function•Micro SIZE PACKAGES: SOT23-3、SOT89-3 (L-Type)APPLICATIONS•

Smart Power Network Equipment•

Portable Power Tools•BMS systems•

Motor control system/Industrialcontrol system•

Power Meter/Instrument•

Vehicle-mounted system•

Firefighting / security equipment•

Consumer products

DESCRIPTION
The RS73xx-1 series is a set of low dropout linear
regulators implemented in CMOS technology. Which canprovide 300mA output current. The device allows input
voltage as high as 45V.It is very suitable for multicell battery
systems, bus voltage power supply systems and other highDC voltage systems. Wide input voltage can make it wellwithstand the impact of surge voltage and ensure thestability of output voltage.
The RS73xx-1 series only 3uA (typical) current isconsumed by itself, which is especially important in multibattery power supply systems and can reduce the standby
power consumption of the whole system.
The RS73xx-1 is available in Green SOT23-3 and SOT893 (L-Type) packages. Meet the requirements of dissipative
power for different applications.

Device Information (1)PART NUMBER
RS73xx-1

PACKAGEBODY SIZE(NOM)

SOT23-3

1.60mm×2.92mm

SOT89-3

2.45mm×4.50mm

Note: XX represents output voltage

Typical Application Schematic
VIN

VIN
CIN
1μF

VOUT

RS73xx-1

VOUTCOUT1μFGND

REV A.4

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RS73xx-1
Revision History
Note: Page numbers for previous revisions may different from page numbers in the current version.
VersionChange Date

Change Item

A.4

2024/03/07(1) Change SOT23-3 and SOT89-3 (L-Type) Thermal Information on Page 4 @A.3 Version.
(2) Add the TAPE AND REEL INFORMATION(3) Modify packaging naming

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RS73xx-1
Pin Configuration and Functions (Top View)
VIN
3

VIN

73XX-173XX-1

1

2

GND

VOUT

SOT23-3

123GNDVIN

VOUT

SOT89-3(L-Type)NOTE: XX indicate Output Voltage, xx indicate Date CodeFor example: 7333-1(VOUT=3.3V)

PIN DESCRIPTIONPINNAMEFUNCTION
SOT23-3

SOT89-3(L-Type)

GND

11Ground.

VOUT

23Output Pin. Recommended output capacitor range:1μF to 10μF.

VIN

3

2

EN//

NC//Input Pin. At least 1μF supply bypass capacitor is recommended.
Enable Pin. EN pin voltage is higher than VEN(H) enable output
and lower than VEN (L) close output.
No connection

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RS73xx-1
PACKAGE/ORDERING INFORMATIONPRODUCT

ORDERING
NUMBER

VOUT(V)

PACKAGE LEAD

PACKAGEMARKING(1)PACKAGE OPTION

RS7318-1YF3

1.8

SOT23-3

7318

Tape and Reel,3000

RS7318-1YE3L

1.8

SOT89-3(L-Type)

7318

Tape and Reel,1000

RS7325-1YF3

2.5

SOT23-37325

Tape and Reel,3000

RS7325-1YE3L

2.5

SOT89-3(L-Type)

7325

Tape and Reel,1000

RS7330-1YF3

3.0

SOT23-3

7330

Tape and Reel,3000

RS7330-1YE3L

3.0

SOT89-3(L-Type)

7330

Tape and Reel,1000

RS7333-1YF3

3.3

SOT23-3

7333

Tape and Reel,3000

RS7333-1YE3L

3.3

SOT89-3(L-Type)

7333

Tape and Reel,1000

RS7336-1YF3

3.6

SOT23-3

7336

Tape and Reel,3000

RS7336-1YE3L

3.6

SOT89-3(L-Type)

7336

Tape and Reel,1000

RS7350-1YF3

5.0

SOT23-3

7350

Tape and Reel,3000

RS7350-1YE3L

5.0

SOT89-3(L-Type)

7350

Tape and Reel,1000

RS7318-1

RS7325-1

RS7330-1

RS7333-1

RS7336-1

RS7350-1
NOTE:(1) There may be additional marking, which relates to the lot trace code information (data code and vendor code), the logo or theenvironmental category on the device.

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RS73xx-1
SPECIFICATIONS
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1) (2)
MINMAXUNIT48

VVIN

Input voltage

-0.3

VEN

VEN voltage range

-0.3

VIN

V

TJ

PN Junction temperature

-40

175°C

PD

Continuous power dissipation (3)Tstg

Storage temperature range

Internal thermal protection temperature limit
-55

W°C

150

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended OperatingConditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to the GND pin.
(3) Internal thermal shutdown circuitry protects the device from permanent damage. The actual chip output current is subject to the inputoutput voltage difference, ambient temperature and PCB heat dissipation design.

ESD Ratings
V(ESD)

Electrostatic discharge

VALUEUNIT

Human-body model (HBM)±4000

VCharge device model (CDM)

±1500

VMIN

MAXUNIT

Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) (1)
VIN

Input supply voltage

2.545V

IOUT

Output current

0300mA

CIN

Input pin capacitance

110uF

COUT

Output pin capacitance

110uF

ESR

Capacitance equivalent resistance

5100ｍΩ

TA

Operating temperature-40+85 (2)°C(1) All voltage is with respect to the GND pin.
(2) The operating temperature of the actual chip depends on the PN junction temperature. Please refer to the detailed calculation methodin the application precautions section.

Thermal Information
RS73xx-1
THERMAL METRIC

SOT23-3

SOT89-3(L-Type)

3 PINS

3 PINS

UNIT

RθJA

Junction-to-ambient thermal resistance

312.5

208.3°C/W

RθJC(top)

Junction-to-case (top) thermal resistance

134.3

88.5°C/W

RθJB

Junction-to-board thermal resistance

84.5

39.6°C/W

ψJT

Junction-to-top characterization parameter

4.8

26.5°C/WψJB

Junction-to-board characterization parameter

81.5

49.7°C/W

RθJC(bot)

Junction-to-case (bottom) thermal resistance

N/A77.7°C/W

PD

Power Dissipation

0.40.6W

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RS73xx-1
ELECTRICAL CHARACTERISTICS(VIN = VOUT + 2V, CIN = COUT = 1μF, Full = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER
Input Voltage (1)SYMBOLTEMPMIN

MAX

UNITS

+25°C

2.5(1)

45

V

IOUT = 10mA+25°C

-2.0

2.0%

IQ

IOUT = 0mA

+25°C

3.0

4.0uA

IQ-OFF

VEN =0V

+25°C

0.1

1.0uA

300

350-mA

VOUT =1.8V-450550

VOUT =2.5V
VDROPVOUT =3.0V
IOUT = 100mA
VOUT =3.3V-385

485-350450-

335435-300

400+25°C-0.05

0.2%/V

VIN

Output Voltage Accuracy
Static power consumption
Shutdown Current

CONDITIONS

Output current (2)Dropout Voltage (3)

+25°C

+25°C

VOUT =5.0V
Line Regulation

ΔVOUT
VIN = VOUT + 2V to 36V,
ΔVIN × VOUT IOUT = 1mA

TYP

mV

Load Regulation

ΔVOUT

VIN =VOUT+1V,
IOUT = 1mA to 50mA

+25°C

-520mV

Output limiting current

I_LMT

VIN =VOUT+1V

+25°C

300

450-mA

short-circuit currentIshort

VOUT = 0+25°C-

100-mA-72-

PSRR

VOUT = 3.3V,
IOUT = 10mA-

77--60-

1.2-

-V-

-0.4

V-

100-

ppm/°C-

100-uVrms

TSHDN-

170-°C

TSDH-

20-°C

f = 217Hz
Power Supply Rejection
Ratio

f = 1KHz+25°C

f = 10KHz
VENH

Enable pin threshold
Output Voltage
Temperature Coefficient (4)Output noise voltage
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis Temperature

+25°C

VENL
ΔVOUT
ΔTA × VOUT
en

IOUT = 1mA

FULL

VIN =VOUT+1V, IOUT =1mA,
VOUT=3.0V, f = 10Hz to 100KHz

dBNOTES:(1). VIN = VOUT (NOMINAL) or 2.5V, or higher voltage.
(2). The maximum output current of the actual chip is subject to PCB heat dissipation design, input voltage, output voltage difference andambient temperature.
(3). Under the condition of VIN = VOUT + 2V and a fixed load, the output voltage decreases by 2%. At this time, the input voltage minus theoutput voltage is the dropout voltage.
(4). Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.

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RS73xx-1
TYPICAL CHARACTERISTICS(VIN = VOUT + 2V, CIN = COUT = 1μF, VOUT = 3.3V, typical values are at TA = +25°C, unless otherwise noted.)

Power-Up/Power-Down Output WaveformLine Transient Response

VIN=0V to 5.3V,I OUT=50mA

VIN=5.3V to 6.3V,IOUT=50mA

2V/div

VOUT

2V/div

VIN

50mV/div

VOUT

1V/div

VINTime(100us/div)

Time(1ms/div)

Load Transient Response

Load Transient Response

VOUT=3.3V

VOUT=3.3V

VOUT

50mA/div

100mA/div

IOUT

20mV/div

50mV/div

VOUT

IOUT

IOUT=1mA to 100mA

IOUT=10mA to 50mA

Time(500us/div)

Time(500us/div)

Line Regulation

3.31

Load Regulation

3.31

VOUT=3.3V

Output Voltage(V)Output Voltage(V)

VOUT=3.3V

3.305

3.3

3.295

3.29

3.3

3.29

3.28

3.27
414

24

34

44

54

0

Input Voltage(V)

50

100

150

200

250

300

Output Current(mA)

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RS73xx-1
TYPICAL CHARACTERISTICS (Continued)(VIN = VOUT + 2V, CIN = COUT = 1μF, VOUT = 3.3V, typical values are at TA = +25°C, unless otherwise noted.)

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RS73xx-1
TYPICAL CHARACTERISTICS (Continued)(VIN = VOUT + 2V, CIN = COUT = 1μF, VOUT = 3.3V, typical values are at TA = +25°C, unless otherwise noted.)

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RS73xx-1
Function introduction
RS73xx-1 series low dropout linear regulator (LDO) consumes only 3uA of current and has excellent linear
adjustment and load characteristics to meet the requirements of lower output noise and higher PSRR, making
it more suitable for applications requiring ultra-low standby power consumption of the whole machine.

Functional Block Diagram

Precautions for heat dissipation design
When the junction temperature of PN junction is too high and reaches the set temperature value, it will trigger
the thermal protection circuit to send a signal to the control logic to turn off the chip output. When the PN junction
temperature is lower than the set protection temperature, the chip will restart automatically. The maximum
output power actually provided by the chip depends on the heat dissipation design of the system, includingambient temperature, wiring thickness and layout, and cooling design, such as adding heat sink and air cooling.
Increasing the PCB area of GND pin can also obtain better heat dissipation performance.

Other application considerations(1) The phase compensation circuit and ESR of the output capacitor are used inside the circuit to compensate,
so a capacitor larger than 1.0uF must be connected to the ground.
(2) It is recommended to use 1uF polar capacitors for input and output, and to keep the capacitors as close tothe VIN and VOUT pins of LDO as possible.
(3) Pay attention to the service conditions of input and output voltage and load current to make the junction
temperature of PN junction lower than the overheat protection temperature.
Approximate estimation method of PN junction temperature:
TPN =(VIN－VOUT) × IOUT×RθJA+T
IOUT is Load current;
T is ambient temperature。
(4) When the input voltage VIN is greater than 2.5V, if VIN is also higher than the output set value plus the device
dropout voltage, VOUT is equal to the set value. Otherwise, VOUT is equal to VIN minus the dropout voltage. If VINlower than 2.5V, the VOUT is:
VOUT = VIN - VDropout
VDropout is converted according to the actual load current and basically maintains a linear relationship.

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RS73xx-1
PACKAGE OUTLINE DIMENSIONSSOT23-3
D1.90

b

2.59

E1

E

0.99
0.95

0.69

ee1

RECOMMENDED LAND PATTERN (Unit: mm)

0.2
A A2cθ
L

A1

Dimensions In Millimeters

Dimensions In Inches

SymbolMinMaxMinMaxA

1.050

1.250

0.041

0.049

A10.000

0.100

0.000

0.004

A21.050

1.150

0.041

0.045

b0.300

0.500

0.012

0.020

c0.100

0.200

0.004

0.008

D

2.820

3.020

0.111

0.119

E

1.500

1.700

0.059

0.067

E1

2.650

2.950

0.104

0.116

e0.950(BSC)

0.037(BSC)

e1

1.800

2.000

0.071

0.079

L

0.300

0.600

0.012

0.024

θ

0°

8°

0°

8°

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RS73xx-1
SOT89-3

Dimensions In Millimeters

Dimensions In Inches

SymbolMinMaxMinMax

A

1.400

1.600

0.055

0.063

b0.320

0.520

0.013

0.020

b1

0.400

0.580

0.016

0.023c

0.350

0.440

0.014

0.017

D

4.400

4.600

0.173

0.181

D1

1.550 REF

0.061 REF

E

2.300

2.600

0.091

0.102

E1

3.940

4.250

0.155

0.167

e

1.500 BSC

0.060 BSC

e1

3.000 BSC

0.118 BSC

L

0.900

1.200

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0.035

0.047

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RS73xx-1
TAPE AND REEL INFORMATIONREEL DIMENSIONSTAPE DIMENSION

Reel
DiameterReel Width(W1)

DIRECTION OF FEEDNOTE: The picture is only for reference. Please make the object as the standard.

KEY PARAMETER LIST OF TAPE AND REEL
SOT23-3

Reel
Diameter
7’’ReelWidth(mm)9.0

A0(mm)
3.20

B0(mm)
3.30

K0(mm)
1.30

P0(mm)
4.0

P1(mm)
4.0P2(mm)
2.0

W(mm)
8.0

Pin1
Quadrant
Q3

SOT89-3

7’’

13.2

4.85

4.45

1.85

4.0

8.0

2.0

12.0

Q3

Package Type

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