RT9080(N) Datasheet by Richtek USA Inc.

RICHTEK RICHTEK

RT9080

DS9080-05 June 2017 www.richtek.com

2μμ

μμ

μA IQ, 600mA Low-Dropout Linear Regulator

Applications

Portable, Battery Powered Equipment

Ultra Low Power Microcontrollers

Notebook Computers

General Description

The RT9080 is a low-dropout (LDO) voltage regulators with

enable function that operates from 1.2V to 5.5V. It provides

up to 600mA of output current and offers low-power

operation in miniaturized packaging.

The features of low quiescent current as low as 2μA and

almost zero disable current is ideal for powering the battery

equipment to a longer service life. The RT9080 is stable

with the ceramic output capacitor over its wide input range

from 1.2V to 5.5V and the entire range of output load

current (0mA to 600mA).

Features



2μμ

μμ

μA Ground Current at no Load



PSRR = 75dB at 1kHz



Adjustable Output Voltage Available by Specific

Application



±±

±±

±2% Output Accuracy



600mA (VIN ≥≥

≥≥

≥ 2.3V) Output Current with EN



Low (0.1μμ

μμ

μA) Disable Current



1.2V to 5.5V Operating Input Voltage



Dropout Voltage : 0.31V at 600mA when VOUT ≥≥

≥≥

≥ 3V



Support Fixed Output Voltage 0.8V to 3.3V



Stable with Ceramic or Tantalum Capacitor



Current-Limit Protection



Over-Temperature Protection



TSOT-23-5 and ZQFN-4L 1x1 (ZDFN-4L 1x1) Packages

Available

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

Ordering Information

Note :

Richtek products are :

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

 Suitable for use in SnPb or Pb-free soldering processes.

Package Type

J5 : TSOT-23-5

QZ : ZQFN-4L 1x1 (Z-Type)

(ZDFN-4L 1x1)

RT9080/N-

Lead Plating System

G : Green (Halogen Free and Pb Free)

Output Voltage

08 : 0.8V

33 : 3.3V

Special Request : Any voltage between

0.8V and 3.3V under specific business

agreement

Pin Function

RT9080 : Without SNS Pin

RT9080N : With SNS Pin

RICHTEK RICHTEK

RT9080

DS9080-05 June 2017www.richtek.com

Functional Pin Description

Pin Configuration

(TOP VIEW)

TSOT-23-5

VIN GND EN

VOUT SNS/NC

ZQFN-4L 1x1 (ZDFN-4L 1x1)

VOUT VIN

GND EN

SGND

Pin No. Pin Name Pin Function

TSOT-23-5 ZQFN-4L 1x1 (ZDFN-4L 1x1)

1 4 VIN Supply voltage input.

2 2 GND Ground.

3 3 EN Enable control input.

4 --

SNS Output voltage sense. (RT9080N only)

NC No internal connection.

5 1 VOUT Output of the regulator.

-- 5 (Exposed Pad) SGND Substrate of chip. Leave floating or tie to GND.

RICHTEK RICHTEK

RT9080

DS9080-05 June 2017 www.richtek.com

Functional Block Diagram

Operation

Basic Operation

The RT9080 is a low quiescent current linear regulator

designed especially for low external components system.

The input voltage range is from 1.2V to 5.5V.

The minimum required output capacitance for stable

operation is 1μF effective capacitance after consideration

of the temperature and voltage coefficient of the capacitor.

Output Transistor

The RT9080 builds in a P-MOSFET output transistor which

provides a low switch-on resistance for low dropout voltage

applications.

Error Amplifier

The Error Amplifier compares the internal reference voltage

with the output feedback voltage from the internal divider,

and controls the Gate voltage of P-MOSFET to support

good line regulation and load regulation at output voltage.

Enable

The RT9080 delivers the output power when it is set to

enable state. When it works in disable state, there is no

output power and the operation quiescent current is almost

zero.

Current-Limit Protection

The RT9080 provides current limit function to prevent the

device from damages during over-load or shorted-circuit

condition. This current is detected by an internal sensing

transistor.

Over-Temperature Protection

The over-temperature protection function will turn off the

P-MOSFET when the junction temperature exceeds 150°C

(typ.), and the output current exceeds 80mA. Once the

junction temperature cools down by approximately 20°C,

the regulator will automatically resume operation.

VIN

GND

VOUT

Current/Thermal

Sense

Bandgap

Reference

SNS

(without sense

function)

(with sense

function)

RICHTEK RICHTEK

RT9080

DS9080-05 June 2017www.richtek.com

Electrical Characteristics

Recommended Operating Conditions (Note 4)

Input Voltage, VIN --------------------------------------------------------------------------------------------------------- 1.2V to 5.5V

Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C

Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C

Absolute Maximum Ratings (Note 1)

VIN, VOUT, SNS, EN to GND ------------------------------------------------------------------------------------------- −0.3V to 6.5V

VOUT to VIN ---------------------------------------------------------------------------------------------------------------- −6.5V to 0.3V

Power Dissipation, PD @ TA = 25°C

TSOT-23-5 ------------------------------------------------------------------------------------------------------------------- 0.43W

ZQFN-4L 1x1 (ZDFN-4L 1x1) -------------------------------------------------------------------------------------------- 0.44W

Package Thermal Resistance (Note 2)

TSOT-23-5, θJA ------------------------------------------------------------------------------------------------------------- 230.6°C/W

TSOT-23-5, θJC ------------------------------------------------------------------------------------------------------------- 21.8°C/W

ZQFN-4L 1x1 (ZDFN-4L 1x1), θJA -------------------------------------------------------------------------------------- 226°C/W

ZQFN-4L 1x1 (ZDFN-4L 1x1), θJC ------------------------------------------------------------------------------------- 43°C/W

Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C

Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C

Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C

ESD Susceptibility (Note 3)

HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV

MM (Machine Model) ------------------------------------------------------------------------------------------------------ 150V

(VOUT + 1 < VIN < 5.5V, TA = 25°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Output Voltage Range VOUT 0.8 -- 3.3 V

DC Output Accuracy ILOAD = 1mA 2 -- 2 %

Dropout Voltage

(ILOAD = 600mA) (Note 5) VDROP

0.8V  VOUT  1.05V (TSOT-23-5) -- 1.05 1.33

0.8V  VOUT  1.05V (ZQFN-4L 1x1) -- 1.05 1.63

1.05V  VOUT  1.2V -- 0.8 1.13

1.2V  VOUT  1.5V -- 0.71 1.03

1.5V  VOUT  1.8V -- 0.57 0.93

1.8V  VOUT  2.1V -- 0.57 0.83

2.1V  VOUT  2.5V -- 0.41 0.73

2.5V  VOUT  3V -- 0.36 0.63

3V  VOUT -- 0.31 0.53

VCC Consumption Current IQ ILOAD = 0mA, VOUT  5.5V

VIN  VOUT + VDROP -- 2 4 A

Shutdown GND Current

(Note 6) VEN = 0V -- 0.1 0.5 A

Shutdown Leakage Current

(Note 6) V

EN = 0V, VOUT = 0V -- 0.1 0.5 A

RICHTEK RICHTEK

RT9080

DS9080-05 June 2017 www.richtek.com

Note 1. Stresses beyond those listed “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 in

the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may

affect device reliability.

Note 2. θJA is measured in the natural convection at TA = 25°C on a two-layer Richtek Evaluation Board for ZQFN-4L 1x1 (ZDFN-

4L1x1) Package.

θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7 for TSOT-23-

5 Package.

Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

Note 5. The dropout voltage is defined as VIN − VOUT, when VOUT is 98% of the normal value of VOUT.

Note 6. The specification is tested at wafer stage and guarantee by design after assembly.

Parameter Symbol Test Conditions Min Typ Max Unit

EN Input Current IEN V

EN = 5.5V -- -- 0.1 A

Line Regulation LINE ILOAD = 1mA

1.2V  VIN  1.5V -- 0.3 0.6

1.5V  VIN  1.8V -- 0.15 0.3

1.8V  VIN  5.5V -- 0.13 0.35

Load Regulation LOAD 1mA < ILOAD < 600mA -- 0.5 1 %

Power Supply Rejection

Ratio PSRR VIN = 3V, ILOAD = 50mA,

COUT = 1F, VOUT = 2.5V, f = 1kHz -- 75 -- dB

Output Voltage Noise

COUT = 1F,

ILOAD = 150mA,

BW = 10Hz to

100kHz,

VIN = VOUT + 1V

VOUT = 0.8V -- 26 --

VRMS

VOUT = 1.2V -- 37 --

VOUT = 1.8V -- 39 --

VOUT = 3.3V -- 42 --

Output Current Limit ILIM V

OUT = 90%VOUT(Normal) 610 1100 -- mA

Enable Input

Voltage

Logic-High VIH V

IN = 5V 0.9 -- -- V

Logic-Low VIL V

IN = 5V -- -- 0.4

Thermal Shutdown

Temperature TSD I

LOAD = 30mA, VIN  1.5V -- 150 -- C

Thermal Shutdown

Hysteresis TSD -- 20 -- C

Discharge Resistance EN = 0V, VOUT = 0.1V -- 80 -- 

OT ; F 4 °—-‘-7 ﬂ_—° ; l % f I ' g f * RICHTEK RICHTEK

RT9080

DS9080-05 June 2017www.richtek.com

Typical Application Circuit

Figure 1. Application with Sense Function

Figure 2. Application without Sense Function

Figure 3. Adjustable Output Voltage Application Circuit

VIN

VOUT

GND

COUT

CIN VOUT

RT9080N

VIN

1µF SNS (Effective Capacitance 1µF)



VIN

VOUT

GND

COUT

CIN VOUT

RT9080

VIN

1µF (Effective Capacitance 1µF)



VIN

VOUT

GND

RT9080N

1µF

SNS

NC COUT

VOUT

CIN

VIN

(Effective Capacitance 1µF)



RICHTEK RICHTEK

RT9080

DS9080-05 June 2017 www.richtek.com

Typical Operating Characteristics

Output Voltage vs. Temperature

3.20

3.22

3.24

3.26

3.28

3.30

3.32

3.34

3.36

3.38

3.40

-50 -25 0 25 50 75 100 125

Temperature (°C)

Output Voltage (V)

VOUT = 3.3V, ILOAD = 1mA

VIN = 3.8V

VIN = 4.5V

VIN = 5.5V

Output Voltage vs. Temperature

0.70

0.72

0.74

0.76

0.78

0.80

0.82

0.84

0.86

0.88

0.90

-50 -25 0 25 50 75 100 125

Temperature (°C)

Output Voltage (V)

VOUT = 0.8V, ILOAD = 1mA

VIN = 1.2V

VIN = 2.1V

VIN = 5.5V

Output Voltage vs. Load Current

0.50

0.55

0.60

0.65

0.70

0.75

0.80

0.85

0.90

0.95

1.00

0 50 100 150 200 250 300 350 400 450 500 550 600

Load Current (mA)

Output Voltage (V)

ILOAD = 0mA to 600mA

VIN = 3V

VIN = 5V

Output Voltage vs. Input Voltage

0.70

0.72

0.74

0.76

0.78

0.80

0.82

0.84

0.86

0.88

0.90

1.2 2.06 2.92 3.78 4.64 5.5

Input Voltage (V)

Output Voltage (V)

VOUT = 0.8V, ILOAD = 1mA

Ground Current vs. Load Current

100

150

200

250

300

350

400

450

500

1 10 100 1000

Load Current (mA)

GND Current (μA)

VIN = 2.2V, VOUT = 0.8V

TA = 65°C

TA = 25°C

TA = −40°C

Ground Current vs. Load Current

100

200

300

400

500

600

700

800

900

1 10 100 1000

Load Current (mA)

GND Current (μA)

VIN = 4.3V, VOUT = 3.3V

TA = 65°C

TA = 25°C

TA = −40°C

RICHTEK INN W ;

RT9080

DS9080-05 June 2017www.richtek.com

Enable Threshold vs. Input Voltage

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

123456

Input Voltage (V)

EN Voltage (V)

Enable Low

Enable High

Enable Threshold vs. Temperature

0.61

0.62

0.63

0.64

0.65

0.66

0.67

0.68

-50 -25 0 25 50 75 100 125

Temperature (°C)

EN Voltage (V)

Enable Low

Enable High

VIN = 5.5V

Dropout Voltage vs. Temperature

100

150

200

250

300

350

400

450

500

-50 -25 0 25 50 75 100 125

Temperature (°C)

Dropout Voltage (mV)

VOUT = 3.3VILOAD = 1mA

ILOAD = 10mA

ILOAD = 100mA

ILOAD = 200mA

ILOAD = 300mA

ILOAD = 400mA

ILOAD = 500mA

ILOAD = 600mA

Shutdown Current vs. Input Voltage

0.00

0.02

0.04

0.06

0.08

0.10

123456

Input Voltage (V)

Shutdown Current (μA) 1

VOUT = 0.8V, EN = 0V

Shutdown Leakage Current vs. Temperature

0.000

0.005

0.010

0.015

0.020

0.025

0.030

0.035

0.040

0.045

-50 -25 0 25 50 75 100 125

Temperature (°C)

Shutdown Leakage Current (μA) 1

VOUT = 0.8V, EN = 0V

VIN = 1.8V

VIN = 5.5V

Current Limit vs. Temperature

200

400

600

800

1000

1200

-50 -25 0 25 50 75 100 125

Temperature (°C )

Current Limit (mA)

VIN = 5V

VOUT = 3.3V

VOUT = 0.8V

RICHTEK RRRRRRR

RT9080

DS9080-05 June 2017 www.richtek.com

Time (100μs/Div)

Load Transient

VOUT

(20mV/Div)

ILOAD

(200mA/Div)

VIN = 1.8V, VOUT = 0.8V, ILOAD = 1mA to 600mA

Time (500μs/Div)

Power Off from EN

VOUT

(2V/Div)

ILOAD

(200mA/Div) VIN = 4V, VOUT = 3.3V, ILOAD = 600mA

Time (500μs/Div)

Power On from EN

VOUT

(2V/Div)

ILOAD

(200mA/Div) VIN = 4V, VOUT = 3.3V, ILOAD = 600mA

Time (250μs/Div)

Line Transient

VOUT

(2mV/Div)

VIN

(1V/Div)

VIN = 2.8V to 3.8V, VOUT = 1.8V, ILOAD = 1mA

Fold-Back Current Limit vs. Temperature

200

400

600

800

1000

1200

1400

-50 -25 0 25 50 75 100 125

Temperature (°C )

Current Limit (mA)

VIN = 5V

VOUT = 3.3V

VOUT = 0.8V

SNS Input Current vs. Temperature

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

-50 -25 0 25 50 75 100 125

Temperature (°C)

SNS Input Current (μA

)

VIN = 5V, VOUT = 0.8V, EN = 3V

RICHTEK /< ww”="" 1"="" rrrrrrr="">

RT9080

DS9080-05 June 2017www.richtek.com

Output Noise

-500

-400

-300

-200

-100

100

200

300

400

500

012345678910

sec (m)

Noise (μV)

VIN = 1.8V, VOUT = 0.8V, ILOAD = 600mA,

COUT = 1μF, Frequency = 10Hz to 100kHz

Output Noise

-500

-400

-300

-200

-100

100

200

300

400

500

012345678910

sec (m)

Noise (μV)

VIN = 4.5V, VOUT = 3.3V, ILOAD = 600mA,

COUT = 1μF, Frequency = 10Hz to 100kHz

PSRR vs. Frequency

-100

-80

-60

-40

-20

10 100 1000 10000 100000 1000000

Frequency (Hz)

PSRR (dB)

ILOAD = 50mA

ILOAD = 30mA

ILOAD = 15mA

ILOAD = 10mA

VIN = 3.3V, VOUT = 2.8V, COUT = 1μF

PSRR vs. Frequency

-100

-80

-60

-40

-20

10 100 1000 10000 100000 1000000

Frequency (Hz)

PSRR (dB)

ILOAD = 150mA

ILOAD = 50mA

ILOAD = 15mA

VIN = 2.8V, VOUT = 0.8V, COUT = 1μF

RICHTEK RICHTEK

RT9080

DS9080-05 June 2017 www.richtek.com

Application Information

Like any low dropout linear regulator, the RT9080's external

input and output capacitors must be properly selected for

stability and performance. Use a 1μF or larger input

capacitor and place it close to the IC's VIN and GND pins.

Any output capacitor meeting the minimum 1mΩ ESR

(Equivalent Series Resistance) and effective capacitance

larger than 1μF requirement may be used. Place the output

capacitor close to the IC's VOUT and GND pins. Increasing

capacitance and decreasing ESR can improve the circuit's

PSRR and line transient response.

Enable

The RT9080 has an EN pin to turn on or turn off the

regulator, When the EN pin is in logic high, the regulator

will be turned on. The shutdown current is almost 0μA

typical. The EN pin may be directly tied to VIN to keep the

part on. The Enable input is CMOS logic and cannot be

left floating.

Adjustable Output Voltage Setting

Because of the small input current at the SNS pin, the

RT9080N with SNS pin also can work as an adjustable

output voltage LDO. Figure 3 gives the connections for

the adjustable output voltage application. The resistor

divider from VOUT to SNS sets the output voltage when

in regulation.

The voltage on the SNS pin sets the output voltage and is

determined by the values of R1 and R2. In order to keep

a good temperature coefficient of output voltage, the values

of R1 and R2 should be selected carefully to ignore the

temperature coefficient of input current at the SNS pin. A

current greater than 50μA in the resistor divider is

recommended to meet the above requirement. The

adjustable output voltage can be calculated using the

formula given in equation 1 :

OUT SNS

R1 + R2

V V (1)



where VSNS is determined by the output voltage selections

in the ordering information of RT9080N. The maximum

adjustable output voltage can be as high as input voltage

deducted by the dropout voltage.

When we choose 51kΩ and 16kΩ as R1 and R2

respectively, and select a 0.8V output at SNS pin, the

adjustable output voltage will be set to around 3.35V. Its

temperature coefficient in Figure 4 is still perfect in such

kind of application.

Figure 4. Temperature Coefficient of Adjustable Output

Voltage

The minimum recommended 50μA in the resistor divider

makes the application no longer an ultra low quiescent

LDO. Figure 5 is another fine adjustable output voltage

application can keep the LDO still operating in low power

consumption. The fine tune range is recommended to be

less than 50mV (R1 ≤ 91kΩ) in order to keep a good

temperature coefficient of the output voltage.

Figure 5. Fine Adjustable Output Voltage Application

Circuit

There isn't extra current consumption in the above

application. But the temperature coefficient of output

voltage will be degraded by the input current at SNS pin.

If the tuning range is larger than 50mV, a compensation

capacitor (56pF) is required to keep the stability of output

voltage. The fine adjustable output voltage is calculated

using the formula given in equation2 :

OUT SNS SNS

V V + I R1 (2)

VIN

VOUT

GND

RT9080N

1µF

SNS

R1 56pF/NC

Output Voltage vs. Temperature

3.28

3.29

3.30

3.31

3.32

3.33

3.34

3.35

-50 -25 0 25 50 75 100 125

Temperature (°C)

Output Voltage (V)

ILOAD = 1mA

RICHTEK \ RICHTEK

RT9080

DS9080-05 June 2017www.richtek.com

Figure 6. Derating Curve of Maximum Power Dissipation

where ISNS is the input Current at SNS pin (typical 550nA

at room temperature) and VSNS is determined by the

output voltage selections in the ordering information of

the RT9080N.

Current Limit

The RT9080 contains an independent current limiter, which

monitors and controls the pass transistor's gate voltage,

limiting the output current to 1.1A (typ.). The current

limiting level is reduced to around 0.6A named fold-back

current limit when the output voltage is further decreased.

The output can be shorted to ground indefinitely without

damaging the part.

Thermal Considerations

For continuous operation, do not exceed absolute

maximum junction temperature. The maximum power

dissipation depends on the thermal resistance of the IC

package, PCB layout, rate of surrounding airflow, and

difference between junction and ambient temperature. The

maximum power dissipation can be calculated by the

following formula :

PD(MAX) = (TJ(MAX) − TA) / θJA

where TJ(MAX) is the maximum junction temperature, TA is

the ambient temperature, and θJA is the junction to ambient

thermal resistance.

For recommended operating condition specifications the

maximum junction temperature is 125°C and TA is the

ambient temperature. The junction to ambient thermal

resistance, θJA, is layout dependent. For TSOT-23-5

package, the thermal resistance, θJA, is 230.6°C/W on a

standard JEDEC 51-7 four-layer thermal test board. For

ZQFN-4L 1x1 (ZDFN-4L 1x1) package, the thermal

resistance, θJA, is 226°C/W on a two-layer Richtek

evaluation board. The maximum power dissipation at TA =

25°C can be calculated by the following formula :

PD(MAX) = (125°C − 25°C) / (230.6°C/W) = 0.43W for

TSOT-23-5 package

PD(MAX) = (125°C − 25°C) / (226°C/W) = 0.44W for

ZQFN-4L 1x1 (ZDFN-4L 1x1) package

The maximum power dissipation depends on the operating

ambient temperature for fixed TJ(MAX) and thermal

resistance, θJA. The derating curve in Figure 6 allows the

designer to see the effect of rising ambient temperature

on the maximum power dissipation.

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0 25 50 75 100 125

Ambient Temperature (°C)

Maximum Power Dissipation (W) 1

ZQFN-4L 1x1 (ZDFN-4L 1x1)

TSOT-23-5

Four-Layer PCB for TSOT-23-5 package

Two-Layer Richtek EVB for ZQFN (ZDFN)-4L 1x1

package

RICHTEK \” A} E I] U l: U x» ’\ RICHTEK

RT9080

DS9080-05 June 2017 www.richtek.com

Outline Dimension

TSOT-23-5 Surface Mount Package

Dimensions In Millimeters Dimensions In Inches

Symbol Min Max Min Max

A 0.700 1.000 0.028 0.039

A1 0.000 0.100 0.000 0.004

B 1.397 1.803 0.055 0.071

b 0.300 0.559 0.012 0.022

C 2.591 3.000 0.102 0.118

D 2.692 3.099 0.106 0.122

e 0.838 1.041 0.033 0.041

H 0.080 0.254 0.003 0.010

L 0.300 0.610 0.012 0.024

RICHTEK ‘1”l‘ DETAIL

RT9080

DS9080-05 June 2017www.richtek.com

Richtek Technology Corporation

14F, No. 8, Tai Yuen 1st Street, Chupei City

Hsinchu, Taiwan, R.O.C.

Tel: (8863)5526789

Richtek products are sold by description only. Customers should obtain the latest relevant information and data sheets before placing orders and should verify

that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek

product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use;

nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent

or patent rights of Richtek or its subsidiaries.

Note : The configuration of the Pin #1 identifier is optional,

but must be located within the zone indicated.

DETAIL A

Pin #1 ID and Tie Bar Mark Options

Min. Max. Min. Max.

A 0.300 0.400 0.012 0.016

A1 0.000 0.050 0.000 0.002

A3 0.117 0.162 0.005 0.006

b 0.175 0.275 0.007 0.011

D 0.900 1.100 0.035 0.043

D2 0.450 0.550 0.018 0.022