RichTek RT9184A Technical data

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Preliminary

RT9184A

Dual, Ultra-Fast Transient Response, 500mA LDO Regulator

General Description

The RT9184A series are an efficient, precise dual-cha nnel
CMOS LDO regulator optimized for ultra-low-quiescent
a pplications. Both regulator outputs are capa ble of sourcing
500mA of output current.

The RT9184A's performa nce is optimized for CD/D VD-ROM,
CD/RW or wireless communication supply applications.
The RT9184A regulators are sta ble with output cap acitors
as low a s 1µF. The other features include ultra low dropout
voltage, high output accura cy , current limiting protection,
and high ripple re jection ratio.

The RT9184A regulators are available in fused SOP-8
package. Key features include current limit, thermal
shutdown, fast transient response, low dropout voltage,
high output accura cy , current limiting protection, and high
ripple rejection ratio.

Applications

z CD/DV D-ROM, CD/R W
z Wireless LAN Card/Keyboard/Mouse
z Battery-Powered Equipment
z XDSL Router

Features

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Low Quiescent Current (Typically 440

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z Guaranteed 500mA Output Current

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z Low Dropout Voltage: 600mV at 500mA

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z Wide Operating Voltage Ranges: 2.8V to 5.5V

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z Ultra-Fast T ran sient Response

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z Tight Load and Line Regulation

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z Current Limiting Protection

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z Thermal Shutdown Protection

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z Only low-ESR Ceramic Capacitors Required for

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Stability

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z Custom Voltage Available

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z RoHS Compliant and 100% Lead (Pb)-Free

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µµ

µA)

µµ

Ordering Information

RT9184A-

Package Type
S : SOP-8

Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard

Output 2
Output 1

Note:

z The output 2 is designated to larger than or equal to

Pin Configurations

(TOP VIEW)

VOUT1

VIN1

VOUT2

VIN2

2
3
4

output 1 in voltage code order below, i.e. V
For example, the part number of RT9184A-FNCS is
assigned for 2.5V

8

GND

7

GND

6

GND

5

GND

number of RT9184A-NFCS is opposite to the rule and
doesn't exist in the system.

V oltage Code f or Both Outputs:

OUT1

/3.3V

, contrary to the part

OUT2

OUT2

≥≥

≥

V

≥≥

OUT1

2: 1.2V A: 2.0V K: 3.0V U: 4.0V

SOP-8

3: 1.3V B: 2.1V L: 3.1V V: 4.1V
4: 1.4V C: 2.2V M: 3.2V W: 4.2V
: : : :
9: 1.9V J: 2.9V T: 3.9V Z: 4.5V

z RichTek Pb-free 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.

−100%matte tin (Sn) plating.

DS9184A-04 March 2005 www.richtek.com

.

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RT9184A

Typical Application Circuit

Preliminary

V

OUT2

V

IN2

VOUT2

VIN2 VIN1

VOUT1

RT9184A

GND

Function Block Diagram

VIN1

V

OUT1

1uF1uF

Note: To prevent oscillation, a 1
dielectric is strongly recommended if ceramics are used

µµ

µF minimum X7R or X5R

µµ

as in put/output cap acitors. When using the Y5V dielectric,

V

IN1

1uF1uF

the minimum value of the input/output capacitance that
can be used for stable over full operating temperature

µµ

3.3

range is

µF. (see Application Information Section for

µµ

further details)

VOUT1

Current

Limiting

Sensor

Thermal

Shutdown

Error

Amplifier

1.2V

Reference

+

-

VIN2

Functional Pin Description

Pin No. Pin Name Pin Function

1 VOUT1 Channel 1 Output Voltage
2 VIN1 Channel 1 Supply Input

5,6,7,8 GND Common Ground

3 VOUT2 Channel 2 Output Voltage
4 VIN2 Channel 2 Supply Input

Current

Limiting

Sensor

Thermal

Shutdown

Error

Amplifier

1.2V

Reference

VOUT2

+

-

GND

DS9184A-04 March 2005www.richtek.com

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Preliminary

RT9184A

Absolute Maximum Ratings (Note 1)

z Supply Input V oltage-------------------------------------------------------------------------------------------------- 6.5V
z Power Dissipation, P

@ T

D

= 25°C

A

SOP-8-------------------------------------------------------------------------------------------------------------------- 0.625W

z Package Thermal Resistance (Note 7)

SOP-8, θJA-------------------------------------------------------------------------------------------------------------- 160°C/W

z Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------- 260°C
z Junction T emperature------------------------------------------------------------------------------------------------- 150°C
z Storage T emperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)

HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Ma chine Mode)-------------------------------------------------------------------------------------------------- 200V

Recommended Operating Conditions (Note 3)

z Supply Input V oltage-------------------------------------------------------------------------------------------------- 2.8V to 5.5V
z Junction T emperature Range---------------------------------------------------------------------------------------- −40°Cto 125°C

Electrical Characteristics

(V

= V

IN

+ 1V, or V

OUT

Parameter Symbol Test Conditions Min Typ Max Units

Output Voltage Accurac y ∆V
Current Limit I
Quiescent Current (both LDOs)

(Note 6)
Dropout Voltage (Note 4) V

Line Regulation ∆V

Load Regulation (Note 5) ∆V
Power Supply Rejection Rate PSRR f = 1kHz, C
Thermal Shutdown Protection TSD -- 170 -- °C
Thermal Shutdown Hysteresis

= 2.8V whichever is greater, CIN = 1µF, C

IN

I

OUT

R

LIM

I

I

Q

I

DROP

LINE

1mA < I

LOAD

∆T

SD

= 1mA −1 -- +3 %

OUT

LOAD

= 0mA -- 440 600 µA

OUT

= 500mA -- 600 -- mV

OUT

= (V

V

IN

I

= 1mA

OUT

-- 40 --

= 1µF, TA = 25°C, for each LDO unless otherwise specified)

OUT

= 1Ω 500 -- -- mA

+ 0.3V) to 5.5V,

OUT

< 500mA -- 30 -- mV

OUT

= 1µF -- −55 -- dB

OUT

-- 0.2 -- %/V

°C

DS9184A-04 March 2005 www.richtek.com

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