Richtek RT9073A-XXGQZ, RT9073A-XXGY Schematic

®

μμ

1

μA IQ, 250mA Low-Dropout Linear Regulator

μμ

RT9073A

General Description

The RT9073A is a low-dropout (LDO) voltage regulators

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

provides up to 250mA of output current and offers low-

power operation in miniaturized packaging.

The features of low quiescent current as low as 1μA and

almost zero disable current is ideal for powering the battery

equipment to a longer service life. The RT9073A 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 250mA).

Ordering Information

RT9073A-

Package Type QZ : ZQFN-4L 1x1 (Z-Type) (ZDFN-4L 1x1) Y : SC-82

Lead Plating System G : Green (Halogen Free and Pb Free)

Output Voltage

09 : 0.9V

1K : 1.05V

12 : 1.2V

15 : 1.5V

18 : 1.8V

19 : 1.9V

25 : 2.5V

27 : 2.7V

28 : 2.8V

29 : 2.9V

30 : 3.0V

33 : 3.3V

Special Request: Any Voltage

Between 0.9V and 3.3V under

specific business agreement

Features

μμ



1

μA Ground Current at no Load





μμ



 PSRR = 75dB at 1kHz



±±





±2% Output Accuracy



±±



 250mA (V



 Low (0.1



 1.2V to 5.5V Operating Input Voltage



 Dropout Voltage : 0.5V at 250mA when V



 Support Fixed Output V oltage 0.9V , 1.05V , 1.2V , 1.5V,



≥≥

≥ 2.3V) Output Current with EN

≥≥

IN

μμ

μA) Disable Current

μμ

OUT

≥≥

≥ 3V

≥≥

1.8V, 1.9V, 2.5V, 2.7V, 2.8V, 2.9V, 3V, 3.3V



 Stable with Ceramic or Tantalum Capacitor



 Current Limit Protection



 Over Temperature Protection



 ZQFN-4L 1x1 (ZDFN-4L 1x1), SC-82 Packages



Available

Applications

 Portable, Battery Powered Equipment

 Ultra Low Power Microcontrollers

 Notebook computers

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

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.

DS9073A-00 April 2015 www.richtek.com

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1

RT9073A

Pin Configurations

1

VOUT VIN

SGND

GND EN

2

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

Functional Pin Description

4

5

3

(TOP VIEW)

VIN

VOUT

4

EN

3

2

GND

SC-82 (SSOT-24)

Pin No.

ZQFN-4L 1x1 (ZDFN-4L 1x1) SC-82 (SSOT-24)

1 3 VOUT Output of the Regulator.

2 2 GND Ground.

3 1 EN Enable Control Input.

4 4 VIN Supply Voltage Input.

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

Pin Name Pin Function

©

DS9073A-00 April 2015www.richtek.com

2

Function Block Diagram

RT9073A

VIN

GND

EN

Bandgap

Reference

Current/Thermal

Sense

Operation

Basic operation

The RT9073A 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.

Output Tra nsistor

The RT9073A 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.

VOUT

+

-

R1

R2

Current Limit Protection

The RT9073A 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.), VIN ≥ 1.5V and the output current exceeds 30mA.

Once the junction temperature cools down by

approximately 20°C, the regulator will automatically

resume operation.

Enable

The RT9073A 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.

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3

RT9073A

Absolute Maximum Ratings (Note 1)

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

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

 Power Dissipation, P

ZQFN-4L 1x1 (ZDFN-4L 1x1) -------------------------------------------------------------------------------------------- 1.07W

SC-82 ------------------------------------------------------------------------------------------------------------------------ 0.28W

 Package Thermal Resistance (Note 2)

ZQFN-4L 1x1 (ZDFN-4L 1x1), θJA-------------------------------------------------------------------------------------- 92.7°C/W

ZQFN-4L 1x1 (ZDFN-4L 1x1), θJC------------------------------------------------------------------------------------- 62.3°C/W

SC-82, θJA------------------------------------------------------------------------------------------------------------------- 345.6°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) ------------------------------------------------------------------------------------------------------ 200V

@ TA = 25°C

D

Recommended Operating Conditions

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

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

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

(Note 4)

Electrical Characteristics

(V

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

OUT

Parameter Symbol Test Conditions Min Typ Max Unit

Output Voltage Range V

DC Output Accuracy I

Dropout Voltage (I

= 50mA)

LOAD

(Note 5)

Dropout Voltage (I

LOAD

=

250mA) (Note 5)

VCC Consumption Current IQ I

0.9 -- 3.3 V

OUT

= 1mA 2 -- 2 %

LOAD

 1.2V -- 0.5 0.65

OUT

 1.5V -- 0.3 0.4

OUT

 1.8V -- 0.2 0.24

OUT

 2.5V -- 0.15 0.18

OUT

 3V -- 0.1 0.15

OUT

-- 0.08 0.12

OUT

 1.2V -- 1.25 1.45

OUT

 1.5V -- 1 1.2

OUT

 1.8V -- 0.81 0.9

OUT

 2.5V -- 0.68 0.8

OUT

 3V -- 0.51 0.6

OUT

-- 0.45 0.6

OUT

≦ 5.5V -- 1 3 A

OUT

V

DROP

V

DROP

0.9V  V

1.2V  V

1.5V  V

1.8V  V

2.5V  V

3V  V

0.9V  V

1.2V  V

1.5V  V

1.8V  V

2.5V  V

3V  V

= 0mA, V

LOAD

V

4

©

DS9073A-00 April 2015www.richtek.com

RT9073A

Parameter Symbol Test Conditions Min Typ Max Unit

Shutdown GND Current

Shutdown Leakage Current

V

EN Input Current IEN V

Line Regulation LINE I

VEN = 0V -- 0.1 0.5 A

= 0V, V

EN

= 5.5V -- -- 0.1 A

EN

= 10mA

LOAD

Load Regulation LOAD 1mA < I

Power Supply Rejection Ratio

Output Voltage Noise

PSRR

VIN = 3V, I

= 1F, V

C

OUT

= 1F,

C

OUT

I

= 30mA,

LOAD

BW = 10Hz to 100kHz, V

= V

IN

OUT

Output Current Limit I

Fold-Back Current Limit V

Enable Input Voltage

Logic-High V

Logic-Low VIL V

Thermal Shutdown Temperature

Thermal Shutdown Hysteresis

Peak output current 260 350 500 mA

LIM

= 0.5 x V

OUT

V

IH

T

I

SD

-- 20 -- C

T

SD

= 5V 1.2 -- --

IN

= 5V -- -- 0.4

IN

= 30mA, VIN  1.5V -- 150 -- C

LOAD

= 0V -- 0.1 0.5 A

OUT

1.2V  V

 1.5V -- -- 0.6

IN

1.5V  VIN  1.8V -- -- 0.3

1.8V  VIN  2.1V -- -- 0.1

2.1V  VIN  5.5V -- -- 0.15

< 200mA -- -- 1 %

LOAD

= 50mA,

LOAD

+ 2V

= 2.5V, f = 1kHz

OUT

= 0.9V -- 39 --

V

OUT

V

= 1.2V -- 46 --

OUT

V

= 1.8V -- 48 --

OUT

V

= 3.3V -- 58 --

OUT

OUT(normal)

190 270 350 mA

-- 75 -- dB

V

%

RMS

V

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. θ

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 V

DS9073A-00 April 2015 www.richtek.com

is measured at T

JA

measured at the exposed pad of the package.

©

= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is

A

IN

− V

, when V

OUT

is 98% of the normal value of V

OUT

.

5

RT9073A

Typical Application Circuit

V

IN

EN

C

IN

1µF

RT9073A

4

VIN

3

EN

GND

2

VOUT

1

C

1µF

OUT

V

OUT

©

DS9073A-00 April 2015www.richtek.com

6

Typical Operating Characteristics

)

RT9073A

Output Voltage vs. Te mperature

3.32

3.31

3.30

3.29

3.28

3.27

Output Voltage (V)

3.26

3.25

-50 -25 0 25 50 75 100 125

I

LOAD

I

LOAD

= 1mA

= 250mA

VIN = 5V, V

Temperature (°C)

Output Volta ge vs. Inp ut Voltage

0.904

0.902

0.900

0.898

OUT

= 3.3V

Output Voltage vs. Te mperature

0.91

0.90

I

= 1mA

0.89

0.88

LOAD

I

LOAD

= 250mA

Output Voltage (V)

0.87

0.86

-50 -25 0 25 50 75 100 125

VIN = 5V, V

Temperature (°C)

Output Voltage vs. Output Current

3.33

3.32

3.31

OUT

= 0.9V

Outout Voltage (V)

0.896

0.894

0.892

V

= 0.9V, I

0.890

OUT

11.522.53 3.544.555.5

LOAD

Input Voltage (V)

Ground Current vs. Input Voltage

2.1

1.8

1.5

1.2

0.9

0.6

Ground Current (μA

0.3

V

0

11.522.53 3.544.555.5

Input Voltage (V)

OUT

= 1mA

= 0.9V

3.3

Output Voltage (V)

3.29

VIN = 5V, V

3.28 0 30 60 90 120 150 180 210 240

Output Current (mA)

Ground Current vs. Temperature

1.5

1.4

1.3

1.2

1.1

1

Ground Current (μA

0.9

VIN = 5V, V

0.8

-50 -25 0 25 50 75 100 125

Temperature (°C)

OUT

= 3.3V

©

DS9073A-00 April 2015 www.richtek.com

7

RT9073A

Shutdown Current vs. Input Voltage

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

Shutdown Current (μA) 1

0.05

0.00

1.2 1.6 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6

Input Voltage (V)

V

= 0.9V, VEN = 0V

OUT

EN Threshold vs. Input Voltage

0.70

0.65

0.60

0.55

0.50

0.45

EN Threshold (V)

0.40

0.35

0.30

1.2 1.6 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6

EN_H

EN_L

Input Voltage (V)

Shutdown Current vs. Temperature

0.30

0.25

0.20

0.15

0.10

V

Shutdown Current (μA) 1

0.05

0.00

-50 -25 0 25 50 75 100 125

IN

V

IN

Temperature (°C)

EN Threshold vs. Temperature

1.00

0.80

EN_H

0.60

0.40

EN Threshold (V)

0.20

0.00

-50 -25 0 25 50 75 100 125

Temperature (°C)

EN_L

VEN = 0V

= 5V

= 3.5V

VIN = 5V

Dropout Voltage vs. Temperature

0.40

VIN = 3.3V

0.35

0.30

0.25

0.20

0.15

0.10

Dropout Voltage (V)

0.05

0.00

-50 -25 0 25 50 75 100 125

Temperature (°C)

©

I

LOAD

I

LOAD

= 100mA

= 50mA

Dropout Voltage (V)

= 20mA

Dropout Voltage vs . Output Current

1.6

V

= 0.9V

OUT

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0.0 0 50 100 150 200 250

Output Current (mA)

TA = 125°C

= 85°C

T

A

T

= 25°C

A

TA = −40°C

DS9073A-00 April 2015www.richtek.com

8

RT9073A

)

Dropout Voltage vs . Output Current

1.4

V

= 1.5V

OUT

1.2

1.0

0.8

0.6

0.4

Dropout Voltage (V)

0.2

0.0 0 50 100 150 200 250

TA = 125°C

T

= 85°C

A

= 25°C

T

A

TA = −40°C

Output Current (mA)

Current Limit vs. Temperature

530

VIN = 5V

480

430

380

V

OUT

= 0.9V

Dropout Voltage vs. Output Current

1.2

V

= 2.5V

OUT

1.0

0.8

TA = 125°C

T

= 85°C

0.6

0.4

A

T

= 25°C

A

TA = −40°C

Dropout Voltage (V)

0.2

0.0 0 50 100 150 200 250

Output Current (mA)

Fold-Back Current Limit vs. Temperature

420

VIN = 5V

370

V

= 0.9V

OUT

320

V

= 3.3V

Current Limit (mA)

330

V

OUT

= 3.3V

270

OUT

Fold-Back Current Limit (mA

280

-50 -25 0 25 50 75 100 125

Temperature (°C)

Ground Current vs. Load Current

200

VIN = 5V

150

100

TA = −40°C

TA = 25°C

= 125°C

T

GND Current (μA)

50

0

0.01 0.1 1 10 100 1000 10000

Load Current (mA)

A

(100mA/Div)

V

(2V/Div)

V

EN

(2V/Div)

V

OUT

(2V/Div)

I

LOAD

220

-50 -25 0 25 50 75 100 125

Temperature (°C)

Power On from EN

IN

V

Time (50μs/Div)

IN

= 5V

©

DS9073A-00 April 2015 www.richtek.com

9

RT9073A

V

IN

(2V/Div)

V

EN

(2V/Div)

V

OUT

(2V/Div)

I

LOAD

(100mA/Div)

V

IN

(200mV/Div)

Power Off from EN

Time (25μs/Div)

Load Transient

Line Transient

V

IN

(2V/Div)

V

OUT

(5mV/Div)

V

IN

= 5V

V

= 2.4V to 5.5V, V

IN

OUT

= 0.9V, I

LOAD

= 10mA

Time (250μs/Div)

PSRR vs. Frequency

0

V

-20

-40

IN

V

IN

V

IN

= 3.5V, I

= 3V, I

= 3.5V, I

LOAD

= 150mA

= 50mA

I

LOAD

(100mA/Div)

300 270 240 210 180 150 120

90 60 30

-30

-60

Noise(μV)

-90

-120

-150

-180

-210

-240

-270

-300

V

= 5V, V

IN

OUT

= 3.3V, I

= 10mA to 250mA

LOAD

Time (250μs/Div)

Output Noise

V

= 2.9V, V

IN

= 1μF, f = 10Hz to 100kHz

C

OUT

0

012345678910

OUT

= 0.9V, I

LOAD

= 100mA

sec (m)

-60

PSRR (dB)

-80

V

= 2.5V, C

-100

OUT

10 100 1000 10000 100000 1000000

OUT

Frequency (Hz)

Output Noise

300

V

= 5.3V, V

IN

270 240

C

= 1μF, f = 10Hz to 100kHz

OUT

210 180 150 120

90 60 30

0

-30

-60

Noise(μV)

-90

-120

-150

-180

-210

-240

-270

-300 012345678910

OUT

= 3.3V, I

LOAD

= 100mA

sec (m)

= 2.2μF

©

DS9073A-00 April 2015www.richtek.com

10

Application Information

RT9073A

Like any low dropout linear regulator, the RT9073A’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) 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 RT9073A 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.

Current Limit

The RT9073A contains an independent current limiter,

which monitors and controls the pass transistor's gate

voltage, limiting the output current to 0.35A (typ.). The

current limiting level is reduced to around 250mA 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 :

resistance, θJA, is layout dependent. For ZQFN-4L 1x1

(ZDFN-4L 1x1) package, the thermal resistance, θJA, is

92.7°C/W on a standard JEDEC 51-7 four-layer thermal

test board. For SC-82 (SSOT-24) package, the thermal

resistance, θJA, is 345.6°C/W on a standard JEDEC 51-7

four-layer thermal test board. The maximum power

dissipation at TA = 25°C can be calculated by the following

formula :

P

= (125°C − 25°C) / (92.7°C/W) = 1.07W for

D(MAX)

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

P

= (125°C − 25°C) / (345.6°C/W) = 0.28W for

D(MAX)

SC-82 (SSOT-24) package

The maximum power dissipation depends on the operating

ambient temperature for fixed T

and thermal

J(MAX)

resistance, θJA. The derating curve in Figure 1 allows the

designer to see the effect of rising ambient temperature

on the maximum power dissipation.

1.6

1.2

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

0.8

0.4

Maximum Power Dissipation (W) 1

SC-82 (SSOT-24)

0.0 0 25 50 75 100 125

Ambient Temperature (°C)

Four-Layer PCB

Figure 1. Derating Curve of Maximum Power Dissipation

P

where T

the ambient temperature, and θ

D(MAX)

= (T

J(MAX)

− TA) / θ

J(MAX)

JA

is the maximum junction temperature, T

is the junction to ambient

JA

is

A

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

DS9073A-00 April 2015 www.richtek.com

©

11

RT9073A

Outline Dimension

Pin #1 ID and Tie Bar Mark Options

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

but must be located within the zone indicated.

Dimensions In Millimeters Dimensions In Inches

Symbol

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

E 0.900 1.100 0.035 0.043

E2 0.450 0.550 0.018 0.022

1

2

DETAIL A

1

2

e

0.625 0.025

L 0.200 0.300 0.008 0.012

H

H1

0.039 0.002

0.064 0.003

Z-Type 4L QFN 1x1 Package

12

©

DS9073A-00 April 2015www.richtek.com

RT9073A

D

e

C

b

A

e

B

b1

A1

H

L

Dimensions In Millimeters Dimensions In Inches

Symbol

Min Max Min Max

A 0.800 1.100 0.031 0.043

A1 0.000 0.100 0.000 0.004

B 1.150 1.350 0.045 0.053

b 0.150 0.400 0.006 0.016

b1 0.350 0.500 0.014 0.020

C 1.800 2.450 0.071 0.096

D 1.800 2.200 0.071 0.087

e 1.300 0.051

H 0.080 0.260 0.003 0.010

L 0.200 0.460 0.008 0.018

SC-82 Surface Mount Package

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. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. 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.

DS9073A-00 April 2015 www.richtek.com

13

Richtek RT9073A-XXGQZ, RT9073A-XXGY Schematic [ru]

Specifications and Main Features

Frequently Asked Questions

User Manual