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

®

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.

Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.

DS9073A-00 April 2015 www.richtek.com

©

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

Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.

©

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.

Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.

DS9073A-00 April 2015 www.richtek.com

©

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

V

Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.

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

Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.

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

OUT

.

5