Richtek RT9018A-10GQW, RT9018A-12GQW, RT9018A-12PQW, RT9018A-15GQW, RT9018A-18GQW Schematic [ru]

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Maximum 3A, Ultra Low Dropout Regulator

RT9018A/B

General Description

The RT9018A/B is a high performance positive voltage

regulator designed for use in applications requiring very

low Input voltage and very low dropout voltage at up to

3A(Peak). It operates with a VIN as low as 1.4V and VDD

voltage 3V with output voltage programmable as low as

0.8V. The significant feature includes ultra low dropout,

ideal for applications where VOUT is very close to VIN.

Additionally, there is an enable pin to further reduce power

dissipation while shutdown. The RT9018A/B provides

excellent regulation over variations in line, load and

temperature. and provides a power OK signal to indicate

if the voltage level of Vo reaches 90% of its rating value.

The RT9018A/B is available in the SOP-8 (Exposed Pad)

and WDFN-10L 3x3 packages with 1V, 1.05V, 1.2V, 1.5V,

1.8V and 2.5V internally preset outputs that are also

adjustable using external resistors.

Ordering Information

RT9018A/B-

Package Type SP : SOP-8 (Exposed Pad-Option 1) QW : WDFN-10L 3x3

Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free)

Output Voltage 10 : 1V/Adj 1K : 1.05V/Adj 12 : 1.2V/Adj 15 : 1.5V/Adj 18 : 1.8V/Adj 25 : 2.5V/Adj

Enable Pin Function A : Internal Pull High B : Internal Pull Low

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.

Features

z Maximum 3A Low-Dropout Voltage Regulator

z High Accuracy Output Voltage

z Typically 210mV Dropout at 3A

z Power Good Output

z Output Voltage Pull Low Resistance when Disable

z Thermal and Over Current Protection

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

±±

±1.5%

±±

Applications

z Front Side Bus VTT (1.2V/3A)

z NoteBook PC Applications

z Motherboard Applications

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

Pin Configurations

(TOP VIEW)

GND

ADJ

VOUT

VDD

VIN

PGOOD

VIN

VDD

SOP-8 (Exposed Pad)

VOUT

ADJ

PGOOD

WDFN-10L 3x3

DS9018A/B-09 April 2012 www.richtek.com

RT9018A/B

Typical Application Circuit

10µF

VIN

VDD

1µF

VOUT

RT9018A/B

PGOOD

GND

ADJ

100k

OUT

Chip Enable

Figure 1. Fixed Voltage Regulator Figure 2. Adjustable Voltage Regulator

10µF

OUT

Chip Enable

R2R1

×=

10µF

OUT

0.8 V

OUT

VIN

10µF

VDD

1µF

VOUT

RT9018A/B

PGOOD

GND

ADJ

Dummy

100k

OUT

Function

Pin Description

Pi n No.

SOP-8

(Exposed Pad)

WDFN -1 0L 3x3

3 7, 8, 9 VIN Supply Input Voltage.

2 6 EN Chip Enable (Active-High).

4 10 VDD Supply Voltage of Control Circuitry.

1 5 PGOOD Power Good Open Drain Output.

7 4 ADJ

6 1, 2, 3 VOUT Output Voltage.

5 -- NC No Internal Connection.

9 (Exposed Pad)

11 (Exposed Pad) GND

Function Block Diagram

VIN

Pin Name

Pin Function

Set the output voltage by the internal feedback resistors when ADJ is grounded. If external feedback resistors is used, V

OUT

0.8V x (R 1 + R2) /R2.

Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.

VOUT

OCP

OTP

VDD

POR

Driver

0.8V

0.72V

Error

Amplifier

Mode

ADJ

PGOOD

GND

DS9018A/B-09 April 2012www.richtek.com

RT9018A/B

Absolute Maximum Ratings (Note 1)

z Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ 1V to 6V

z Control Voltage, VDD ----------------------------------------------------------------------------------------------------- 3V to 6V

z Output Voltage, VOUT --------------------------------------------------------------------------------------------------- 0.8 to 6V

z Power Dissipation, P

SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------------- 1.33W

WDFN-10L 3x3 ------------------------------------------------------------------------------------------------------------- 1.67W

z Package Thermal Resistance (Note 2)

SOP-8 (Exposed Pad), θJA---------------------------------------------------------------------------------------------- 75°C/W

SOP-8 (Exposed Pad), θJC--------------------------------------------------------------------------------------------- 15°C/W

WDFN-10L 3x3, θJA------------------------------------------------------------------------------------------------------- 60°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

@ TA = 25°C

Recommended Operating Conditions (Note 4)

z Supply Voltage, V

z Control Voltage, VDD

z Control Voltage with PGOOD, VDD

z Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C z Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C

------------------------------------------------------------------------------------------------------- 1.4V to 5.5V

(VDD

> V

+ 1.5V) -------------------------------------------------------------------------- 3V to 5.5V

OUT

(Note 8) ----------------------------------------------------------------------- 4.5V to 5.5V

Electrical Characteristics

= V

+ 500mV, V

OUT

Parameter Symbol Test Conditions Min Typ Max Unit

POR Threshold 2.4 2.7 3 V

POR Hysteresis 0.15 0.2 -- V

Adjustable Pin Threshold V

Reference Voltage (ADJ Pin Voltage) V

Fixed Output Voltage Range ΔV

Line Regulation (VIN) ΔV

Load Regulation (Note 5) ΔV

Dropout Voltage (Note 6) V

Quiescent Current (Note 7) IQ V

Current Limit I

= V

= 5V, C

= C

= 10μF, T

OUT

TH_ADJ

ADJ

−1.5 0 1.5 %

OUT

LINE_IN

LOAD

DROP

3.2 4.5 -- A

LIM

= T

OUT

= 25°C, unless otherwise specified)

= 1mA -- 0.2 0.4 V

= 1mA 0.788 0.8 0.812 V

= V

+ 0.5V to 5V,

OUT

= 1mA

+ 1V,

OUT

= 1mA to 3A

-- 0.2 0.6 %

-- 0.2 1 %

= 2A -- 150 250

= 3A -- 210 350

= 5.5V -- 0.6 1.2 mA

DS9018A/B-09 April 2012 www.richtek.com

RT9018A/B

Parameter Symbol Test Conditions Min Typ Max Unit

Short Circuit Current

In-rush Current

Pull Low Resistance

OUT

< 0.2V 0.5 1.8 -- A

OUT

= 10μF, Enable Start-up -- 0.6 -- A

OUT

= 0V -- 150 -- Ω

Chip Enable

EN Input Bias Current IEN V

Current

EN Threshold Voltage

RT9018A -- 10 20 VDD Shutdown

RT9018B

Logic-Low V

Logic-High V

VEN = 0V

SHDN

VDD = 5V -- -- 0.7

ENL

VDD = 5V 1.2 -- --

ENH

= 0V -- 12 -- μA

-- -- 1

μA

Powe r Good

PGOOD Rising Threshold -- 90 93 %

PGOOD Hysteresis 3 10 -- %

PGOOD Sink Capability I

PGOOD

= 10mA -- 0.2 0.4 V

PGOOD Delay 0.5 1.5 5 ms

Thermal Protection

Thermal Shutdown Temperature TSD -- 160 -- °C

Thermal Shutdown Hysteresis ΔTSD -- 30 -- °C

Thermal Shutdown Temperature

Fold-back

< 0.4V -- 110 -- °C

OUT

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 recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested for load

Note 6. The dropout voltage is defined as V Note 7. Quiescent, or ground current, is the difference between input and output currents. It is defined by I

Note 8. The control voltage must within 4.5V to 5.5V when using PGOOD function.

is measured at T

measured at the exposed pad of the package.

regulation in the load range from 1mA to 3A.

load condition (I

current.

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

-V

= 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin

OUT

, which is measured when V

OUT

is V

OUT(NORMAL)

- 100mV.

= IIN - I

under no

OUT

DS9018A/B-09 April 2012www.richtek.com

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