RT9054_技术文档

®

RT9054

Portable Power Management 300mA Dual LDO Regulator

General Description

Features

z Wide Operating Voltage Ranges : 2.5V to 5.5V

The RT9054 is a dual channel, low noise, and low dropout

regulator sourcing up to 300mAat each channel. The range

of output voltage is from 1.2V to 3.6V by operating from

2.5V to 5.5V input.

z Low-Noise for RF Application

z No Noise Bypass Capacitor Required

z Fast Response in Line/Load Transient

z TTL-Logic-Controlled Shutdown Input

z Low Temperature Coefficient

The RT9054 offers 3% accuracy, extremely low dropout

voltage (240mV @ 300mA), and extremely low ground

current, only 27μA per LDO. The shutdown current is near

zero current which is suitable for battery-power devices.

Other features include current limiting, over temperature

and output short circuit protection.

^zDual LDO Outputs (300mA/300mA)

^zUltra-low Quiescent Current 27μA/LDO

^zHigh Output Accuracy 3%

^zShort Circuit Protection

^zThermal Shutdown Protection

^zCurrent Limit Protection

The RT9054 is short circuit thermal folded back protected.

The IC lowers its OTP trip point from 165°C to 110°C when

output short circuit occurs (V_OUT< 0.4V) providing

maximum safety to end users.

z Short Circuit Thermal Folded Back Protection

z Tiny 6-Lead WDFN Packages

z RoHS Compliant and Halogen Free

The RT9054 can operate stably with very small ceramic

output capacitors, reducing required board space and

component cost. The RT9054 is available in fixed output

voltages in the WDFN-6L 1.6x1.6 packages.

Applications

z CDMA/GSM Cellular Handsets

z Battery-Powered Equipment

z Laptop, Palmtops, Notebook Computers

z Hand-Held Instruments

Ordering Information

z PCMCIA Cards

RT9054-

z Portable InformationAppliances

Package Type

QW : WDFN-6L 1.6x1.6 (W-Type)

Marking Information

Lead Plating System

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

G : Green (Halogen Free and Pb Free)

Output Voltage : VOUT1/VOUT2

VOUT2 > VOUT1 is Recommended

Note :

Richtek products are :

Available Voltage Version

Code Voltage Code Voltage Code Voltage

` RoHS compliant and compatible with the current

require-

A

D

G

K

N

R

V

Y

3.5

1.85

1.8

B

E

H

L

1.3

2.1

2

C

F

1.2

1.5

ments of IPC/JEDEC J-STD-020.

` Suitable for use in SnPb or Pb-free soldering

processes.

J

2.5

2.6

2.7

3

M

Q

T

2.8

2.85

3.2

P

S

W

U

3.1

3.3

1.6

1.4

2.65

3.15

2.9

X

1.9

©

is a registered trademark of Richtek Technology Corporation.

DS9054-03 February 2012

www.richtek.com

1

RT9054

Pin Configurations

(TOP VIEW)

1

2

3

6

5

4

VIN

EN1

EN2

VOUT1

VOUT2

GND

7

WDFN-6L 1.6x1.6

Typical Application Circuit

V

OUT1

VOUT1

RT9054

VIN

IN

C

OUT1

C

IN

4.7µF/X7R

1µF

EN1

EN2

V

VOUT2

OUT2

Chip Enable

C

OUT2

4.7µF/X7R

GND

Functional Pin Description

Pin No.

Pin Name

Pin Function

1

2

3

VIN

Supply Input.

EN1

Chip Enable1.

Chip Enable2.

EN2

4, 7

Common Ground. The exposed pad must be soldered to a large PCB and

connected to GND for maximum power dissipation.

GND

(Exposed Pad)

5

6

VOUT2

VOUT1

Channel 2 Output Voltage.

Channel 1 Output Voltage.

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2

DS9054-03 February 2012

RT9054

Function Block Diagram

EN1

Shutdown

and

Logic Control

VIN

250k

V_REF

MOS Driver

+

Error

Amplifier

VOUT1

GND

Current-Limit

and

Thermal

Protection

EN2

Shutdown

and

250k

Logic Control

V_REF

MOS Driver

+

Error

Amplifier

VOUT2

GND

Current-Limit

and

Thermal

Protection

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DS9054-03 February 2012

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3

RT9054

Absolute Maximum Ratings (Note 1)

z Supply Input Voltage------------------------------------------------------------------------------------------------------ −0.3V to 7V

z Other I/O Pin Voltages --------------------------------------------------------------------------------------------------- −0.3V to 7V

z PowerDissipation, P_D@ T_A= 25°C

WDFN-6L 1.6x1.6 --------------------------------------------------------------------------------------------------------- 0.571W

z Package Thermal Resistance (Note 2) -----------------------------------------------------------------------------

WDFN-6L 1.6x1.6, θ_JA---------------------------------------------------------------------------------------------------- 175°C/W

z Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C

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

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

z ESD Susceptibility (Note 3)

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

MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V

Recommended Operating Conditions (Note 4)

z Supply Input Voltage------------------------------------------------------------------------------------------------------ 2.5V to 5.5V

z Enable Input Voltage------------------------------------------------------------------------------------------------------ 0V to 5.5V

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

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

Electrical Characteristics

(V_IN= V_OUTx+ 1V, V_ENx= V_IN, C_IN= 1μF, C_OUT= 4.7μF, T_A= 25°C, unless otherwise specified.)

Parameter

Dropout Voltage (Note 5)

Output Voltage Range

Accuracy

Symbol

Test Conditions

= 300mA

Min

--

Typ

240

--

Max

330

3.6

Unit

mV

V

I

OUTx

DROP

OUTx

1.2

−3

V

ΔV

I = 1mA to 300mA

OUTx OUTx

--

+3

%

OUT

V

= (V

+ 0.3V) to 5.5V or

IN

OUTx

Line Regulation

ΔV

--

0.2

%/V

LINE

> 2.5V, whichever is larger

IN

Load Regulation

Current Limit

ΔV

1mA < I

< 300mA

--

330

--

450

58

--

0.6

700

80

1

%

mA

LOAD

OUTx

I

R = 1Ω

LOAD

LIM

Q

Quiescent Current

Shutdown Current

Output Voltage TC

I

V

> 1.5V

< 0.4V

μA

ENx

V

ENx

--

μA

Q_SD

--

100

--

ppm/°C

Logic High

Logic Low

V

= 2.5V to 5.5V, Power On

= 2.5V to 5.5V, Shutdown

1.5

--

IH

IL

IN

EN Input

Threshold Voltage

V

IN

--

0.4

330

EN Input Pull-Low Resistor

Discharge Resistance in

150

250

kΩ

V

OUT

V = 5V, EN1 = EN2 = GND

IN

--

3

--

Shutdown

(Note 6)

Thermal Shutdown

T

--

170

40

--

°C

SD

Thermal Shutdown Hysteresis

ΔT

SD

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DS9054-03 February 2012

RT9054

Parameter

Symbol

Test Conditions

f = 100Hz

Min

Typ

Max

Unit

--

70

--

PSRR

V

= V

+ 1V, C

= 4.7μF

PSRR

f = 1kHz

dB

IN

OUT

I

= 50mA

LOAD

f = 10kHz

f = 100kHz

f = 200kHz

f = 300kHz

--

54

45

38

--

PSRR

V

= V

+ 1V, C

dB

IN

OUT

I

= 50mA

LOAD

C

= C

= 10μF, 10Hz to

OUT1

OUT2

Output Voltage Noise

--

100

--

μV

RMS

100kHz, I

= I

= 1mA

OUT1

OUT2

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_JAis measured at T_A= 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3. θ_JCis

measured at the exposed pad of the package.

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

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

Note 5. The dropout voltage is defined as V_IN-V_OUT, which is measured when V_OUTis V_OUT(NORMAL)− 100mV.

Note 6. It is guaranteed by design.

©

is a registered trademark of Richtek Technology Corporation.

DS9054-03 February 2012

www.richtek.com

5

RT9054

Typical Operating Characteristics

Output Voltage vs. Temperature

3.4

3.35

3.3

1.9

RT9054-GS, V_OUT1

RT9054-GS, V_OUT2

1.85

1.8

3.25

3.2

1.75

1.7

-50

-25

0

25

50

75

100

125

-50

-25

0

25

50

75

100

125

(°C)

Temperature

Temperature (°C)

Quiescent Current vs. Temperature

Dropout Voltage vs. Load Current

70

65

60

55

50

350

300

250

200

150

100

50

RT9054-GS

RT9054-GS, V_OUT2

V_IN= V_ENx= 4.3V

T_J= 125°C

T_J= 25°C

T_J= -40°C

0

50

100

150

200

250

300

-50

-25

0

25

50

75

100

125

Temperature (°C)

Load Current (mA)

Line Transient Response

Power On from V_IN

RT9054-FM, V_EN1= V_EN2= 1.5V

Both I_LOAD= 10mA

RT9054-GS, Both I_LOAD= 1mA

V_IN= 3.8V to 4.8V

4.8

V_IN

(V)

V_IN

(5V/Div)

3.8

V_OUT2

(10mV/Div)

V_OUT1

(1V/Div)

V_OUT1

(10mV/Div)

V_OUT2

(2V/Div)

Time (100μs/Div)

Time (10μs/Div)

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DS9054-03 February 2012

RT9054

Line Transient Response

RT9054-GS, Both I_LOAD= 10mA

V_IN= 3.8V to 4.8V

RT9054-GS, Both I_LOAD= 50mA

V_IN= 3.8V to 4.8V

4.8

3.8

4.8

3.8

V_IN

(V)

V_IN

(V)

V_OUT2

(10mV/Div)

V_OUT1

(10mV/Div)

Time (100μs/Div)

Load Transient Response

Line Transient Response

RT9054-GS, Both I_LOAD= 100mA

V_IN= 3.8V to 4.8V

RT9054-GS, I_LOAD= 10mA to 50mA

V_IN= V_EN= 4.3V

4.8

V_IN

(V)

I_OUT

(50mA/Div)

3.8

V_OUT2

(10mV/Div)

V_OUT1

(20mV/Div)

V_OUT1

(10mV/Div)

V_OUT2

(20mV/Div)

Time (250μs/Div)

Time (100μs/Div)

Power On from EN

Load Transient Response

RT9054-GS, I_LOAD= 10mA to 100mA

V_IN= V_EN= 4.3V

RT9054-FM, V_IN= 5V

I_OUT1= I_OUT2= 50mA

V_EN1= V_EN2

I_OUT

(5V/Div)

(1V/Div)

(100mA/Div)

V_OUT2

V_OUT1

(20mV/Div)

V_OUT1

V_OUT2

(20mV/Div)

Time (250μs/Div)

Time (5μs/Div)

©

is a registered trademark of Richtek Technology Corporation.

DS9054-03 February 2012

www.richtek.com

7

RT9054

PSRR

EN Pin Shutdown Response

20

0

RT9054-FM, V_IN= 5V

I_OUT1= I_OUT2= 50mA

I_OUT= 50mA

V_EN1= V_EN2

(5V/Div)

(1V/Div)

-20

-40

-60

-80

V_OUT2

V_OUT1

10

100

1000

1k

10000

10k

100000 1000000

100k 1M

Time (50μs/Div)

Frequency(Hz)

Noise

RT9054-GS, No LOAD

V_IN= V_ENx= 4.5V(By battery)

RT9054-GS, I_LOAD= 50mA

V_IN= V_ENx= 4.5V(By battery)

150

100

50

300

200

100

0

-50

-100

-150

-100

-200

-300

Time (10ms/Div)

EN1 Pin Shutdown Response

EN2 Pin Shutdown Response

V_EN1

V_EN2

V_EN1

V_OUT2

V_EN1

(2V/Div)

V_EN2

(2V/Div)

V_EN1

(2V/Div)

V_EN2

(2V/Div)

V_EN2

V_OUT1

(1V/Div)

V_OUT2

Time (10ms/Div)

©

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

8

DS9054-03 February 2012

RT9054

Application Information

Like any low-dropout regulator, the external capacitors used

with the RT9054 must be carefully selected for regulator

stability and performance. Using a capacitor value is >1μF

on the RT9054 input, and the amount of capacitance can

be increased without limit. The input capacitor must be

located at a distance of not more than 0.5 inch from the

input pin of the IC and returned to a clean analog ground.

Any good quality ceramic or tantalum can be used for this

capacitor. The capacitor with larger value and lower ESR

(equivalent series resistance) provides better PSRR and

line-transient response.

Thermal Considerations

Thermal protection limits power dissipation in RT9054.

When the operation junction temperature exceeds 170°C,

the OTP circuit starts the thermal shutdown function and

turns the pass element off. The pass element turns on

again after the junction temperature cools by 40°C. The

RT9054 lowers its OTP trip level from 170°C to 110°C

when output short circuit occurs (V_OUT< 0.4V) as shown

in Figure 2. It limits the IC case temperature to under

100°C and provides maximum safety to customer while

output short circuit occurs.

V

Short to GND

OUT

The output capacitor must meet both requirements for

minimum amount of capacitance and ESR in all LDO

applications. The RT9054 is designed specifically to work

with low ESR ceramic output capacitor under space-saving

and performance consideration. Using a ceramic capacitor

with value at least 4.7μF and ESR is > 20mΩ on the

RT9054 output ensures stability. The RT9054 still works

well with output capacitor of other types due to the wide

stable ESR range. Figure 1. shows the curves of allowable

ESR range as a function of load current for various output

capacitor values. Output capacitor of larger capacitance

can reduce noise and improve load transient response,

stability, and PSRR. The output capacitor should be located

not more than 0.5 inch from the VOUT pin of the RT9054

and returned to a clean analog ground.

0.4V

V

OUT

I

OUT

T

SD

°

170 C

OTP Trip Point

110 C

°

110 C

80 °C

IC Temperature

Figure 2. Short Circuit Thermal Folded Back Protection

when Output Short Circuit Occurs (Patent)

Region of Stable C_OUTESR vs. Load Current

100

RT9054-FM,

For continuous operation, do not exceed absolute

maximum operation junction temperature 125°C. The

power dissipation definition in device is :

C_OUT= 4.7μF/X7R

10

Unstable Range

P_D= (V_IN-V_OUT) x I_OUT+ V_INx I_Q

1

The maximum power dissipation depends on the thermal

resistance of the IC package, PCB layout, rate of

surrounding airflow and temperature difference between

junction to ambient. The maximum power dissipation can

be calculated by the following formula :

Stable Range

0.1

0.01

Simulation Verify

0.001

P_D(MAX)= (T_J(MAX)− T_A) /θ_JA

0

50

100

150

200

250

300

Load Current (mA)

Figure 1. Stable Cout ESR Range

where T_J(MAX)is the maximum operation junction

temperature, T_Ais the ambient temperature and θ_JAis the

junction to ambient thermal resistance.

©

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DS9054-03 February 2012

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9

RT9054

For recommended operating conditions specification of

the IC, the maximum junction temperature is 125°C. The

junction to ambient thermal resistance ( θ_JAis layout

dependent ) for WDFN-8L 1.6x1.6 is 175°C/W on the

standard JEDEC 51-3 single-layer thermal test board. The

maximum power dissipation at T_A= 25°C can be calculated

by the following formula :

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

Single Layer PCB

WDFN-6L 1.6x1.6

P_D(MAX)= ( 125°C − 25°C ) / (175°C/W) = 0.571W for

WDFN-6L 1.6x1.6 packages

The maximum power dissipation depends on the operating

ambient temperature for fixed T_J(MAX)and thermal

resistance θ_JA. For the IC packages, the Figure 3 of de-

rating curves allows the designer to see the effect of rising

ambient temperature on the maximum power dissipation.

0

25

50

75

100

125

Ambient Temperature (°C)

Figure 3. Derating Curve of Maximum PowerDissipation

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DS9054-03 February 2012

RT9054

Outline Dimension

D

D2

L

E

E2

SEE DETAIL A

1

b

2

1

2

1

e

DETAILA

Pin #1 ID and Tie Bar Mark Options

A

A3

A1

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

0.031

0.002

0.010

0.012

0.065

0.041

0.065

0.026

A

A1

A3

b

0.700

0.000

0.175

0.200

1.550

0.950

1.550

0.550

0.800

0.050

0.250

0.300

1.650

1.050

1.650

0.650

0.028

0.000

0.007

0.008

0.061

0.037

0.061

0.022

D

D2

E

E2

e

0.500

0.020

L

0.190

0.290

0.007

0.011

W-Type 6L DFN 1.6x1.6 Package

Richtek Technology Corporation

5F, No. 20, Taiyuen 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.

DS9054-03 February 2012

www.richtek.com

11


型号：	RT9054
厂家：	RICHTEK TECHNOLOGY CORPORATION
描述：	Portable Power Management 300mA Dual LDO Regulator 便携式电源管理300毫安双路LDO稳压器稳压器多点低压差线性稳压器便携式
文件：	总11页 (文件大小：306K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

RT9054 [RICHTEK]

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