Richtek RT8009-10GJ5, RT8009-10PJ5, RT8009-12GB, RT8009-12GJ5, RT8009-12PB, RT8009-12PJ5, RT8009-13PB, RT8009-18GB, RT8009-18PB, RT8009-25GJ5, RT8009-25PJ5, RT8009-33GJ5, RT8009-33PB, RT8009-33PJ5, RT8009GB, RT8009GJ5, RT8009PB, RT8009PJ5 Schematic [ru]

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RT8009

1.25MHz, 600mA, High Efficiency PWM Step-Down

DC/DC Converter

General Description

The RT8009 is a high-efficiency pulse-width-modulated (PWM) step-down DC/DC converter. Capable of delivering 600mA output current over a wide input voltage range from 2.5 to 5.5V, the RT8009 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources within the range such as cellular phones, PDAs and handy-terminals.

Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The RT8009 automatically turns off the synchronous rectifier while the inductor current is low and enters discontinuous PWM mode. This can increase efficiency at light load condition.

The RT8009 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. RT8009 enter shutdown mode and consumes less than 0.1μAwhen ENpin is pulled low.

The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operation frequency of 1.25MHz. This along with small SOT-23-5 and TSOT-23-5 package provides small PCB area application. Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection.

Pin Configurations

(TOP VIEW)

LX FB/VOUT

5 4

2 3

VIN GND EN

SOT-23-5/TSOT-23-5

Marking Information

For marking information, contact our sales representative directly or through a Richtek distributor located in your area.

Features

2.5V to 5.5V Input Range

Adjustable Output From 0.5V to VIN

1.0V, 1.2V, 1.3V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/

Adjustable Output Voltage

600mA Output Current

95% Efficiency

No Schottky Diode Required

1.25MHz Fixed Frequency PWM Operation

Small SOT-23-5 and TSOT-23-5 Package

RoHS Compliant and 100% Lead (Pb)-Free

Applications

Cellular Telephones

Personal Information Appliances

Wireless and DSL Modems

MP3 Players

Portable Instruments

Ordering Information

RT8009(-)

Package Type

B : SOT-23-5

J5 : TSOT-23-5

Lead Plating System P : Pb Free

G : Green (Halogen Free and Pb Free)

Output Voltage Default : Adjustable 10 : 1.0V

12 : 1.2V

13 : 1.3V

15 : 1.5V

18 : 1.8V

25 : 2.5V

33 : 3.3V

Note :

Richtek products are :

`RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.

`Suitable for use in SnPb or Pb-free soldering processes.

DS8009-07 March 2011

www.richtek.com

 

1

RT8009

Typical Application Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

 

 

 

 

VIN

 

 

 

 

1

VIN

 

 

 

 

 

 

 

 

LX

5

4.7µH

 

 

 

VOUT

2.5V to 5.5V

 

 

 

 

 

 

CIN

 

RT8009

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.7µF

3

4

 

 

 

 

 

 

 

COUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EN

 

 

 

 

 

 

VOUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1. Fixed Voltage Regulator

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

 

 

 

 

 

 

 

 

 

 

 

 

 

R1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.7µH

 

 

 

 

 

 

 

 

 

 

 

 

VIN

 

 

 

1 VIN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT =

VREF x 1

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LX

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT

 

 

R2

2.5V to 5.5V

 

 

CIN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C1

 

 

 

 

 

 

 

 

 

 

with R1+R2 ≤1MΩand

 

 

 

 

 

4.7µF

 

RT8009

 

 

 

 

R1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VREF(Typ.) = 0.5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

EN

 

 

 

 

 

 

 

FB

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

R2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 2. Adjustable Voltage Regulator

Layout Guide

VIN

 

 

L

VOUT

VIN

 

 

L

 

VOUT

VIN

1

5

LX

 

VIN

1

5

LX

 

 

CIN

 

 

 

COUT

CIN

 

 

 

COUT

 

GND

2

 

 

GND

GND

2

 

 

R2

GND

 

 

 

 

 

 

 

 

 

 

EN

3

4

VOUT

 

EN

3

4

FB

R1

VOUT

 

 

 

 

 

 

 

 

 

C1

 

Figure 3

Layout note:

1.The distance that CIN connects to VIN is as close as possible (Under 2mm).

2.COUT should be placed near RT8009.

www.richtek.com

DS8009-07 March 2011

2

 

 

 

RT8009

Functional Pin Description

Pin Number

Pin Name

Pin Function

 

 

 

 

 

1

VIN

Power Input.

 

 

 

 

 

2

GND

Ground.

 

 

 

 

 

3

EN

Chip Enable (Active High, do not leave EN pin floating, and VEN < VIN + 0.6V).

 

 

 

 

 

4

FB/VOUT

Feedback Input Pin.

 

 

 

 

 

5

LX

Pin for Switching.

 

 

 

 

 

Function Block Diagram

 

 

EN

 

 

VIN

 

 

OSC &

 

 

RS1

 

 

Current

 

 

 

 

Shutdown

 

 

 

 

Limit

 

 

 

 

Control

 

 

 

 

Detector

 

 

 

Slope

 

 

 

 

 

 

 

 

 

Compensation

Current

 

 

 

 

 

 

 

 

 

 

Sense

 

 

 

 

 

 

Control

Driver

LX

 

 

PWM

Logic

 

 

 

 

 

 

 

FB/VOUT

Error

Comparator

 

 

 

 

Amplifier

 

 

 

 

 

RC

 

 

 

 

 

 

UVLO &

Zero

 

RS2

 

COMP

Detector

 

 

Power Good

 

 

 

 

 

 

 

 

 

Detector

VREF

 

 

 

 

 

 

 

 

 

 

 

GND

 

DS8009-07 March 2011

www.richtek.com

3

RT8009

Absolute Maximum Ratings (Note 1)

Supply Input Voltage ------------------------------------------------------------------------------------------------------

6.5V

Enable, FB Voltage -------------------------------------------------------------------------------------------------------

VIN + 0.6V

Power Dissipation, PD @ TA = 25°C

 

SOT-23-5, TSOT-23-5 -----------------------------------------------------------------------------------------------------

0.4W

Package Thermal Resistance (Note 2)

 

SOT-23-5, TSOT-23-5, θJA -----------------------------------------------------------------------------------------------

250°C/W

SOT-23-5, TSOT-23-5, θJC -----------------------------------------------------------------------------------------------

130°C/W

Junction Temperature Range --------------------------------------------------------------------------------------------

150°C

Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------

260°C

Storage Temperature Range --------------------------------------------------------------------------------------------

−65°C to 150°C

ESD Susceptibility (Note 3)

 

HBM (Human Body Mode) ----------------------------------------------------------------------------------------------

2kV

MM (Machine Mode) ------------------------------------------------------------------------------------------------------

200V

Recommended Operating Conditions

(Note 4)

Supply Input Voltage ------------------------------------------------------------------------------------------------------

2.5V to 5.5V

Junction Temperature Range --------------------------------------------------------------------------------------------

−40°C to 125°C

Ambient Temperature Range --------------------------------------------------------------------------------------------

−40°C to 85°C

Electrical Characteristics

(VIN = 3.6V, VOUT = 2.5V, VREF = 0.5V, L = 4.7μH, CIN = 4.7μF, COUT = 10μF, TA = 25°C, IMAX = 600mA unless otherwise specified)

Parameter

Symbol

Test Conditions

 

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

 

 

 

Input Voltage Range

VIN

 

 

2.5

--

5.5

V

 

Quiescent Current

 

IQ

IOUT = 0mA, VFB = VREF + 5%

--

50

100

μA

 

Shutdown Current

 

ISHDN

EN = GND

 

--

0.1

1

μA

 

Reference Voltage

 

VREF

For adjustable output voltage

0.49

0.5

0.51

V

 

Adjustable Output Range

VOUT

 

 

VREF

--

VIN −0.2

V

 

 

 

VOUT

VIN = 2.5 to 5.5V, VOUT = 1.0V

−3

--

3

%

 

 

 

0A < IOUT < 600mA

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT

VIN = 2.5 to 5.5V, VOUT = 1.2V

−3

--

3

%

 

 

 

0A < IOUT < 600mA

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT

VIN = 2.5 to 5.5V, VOUT = 1.3V

−3

--

3

%

 

 

 

0A < IOUT < 600mA

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT

VIN = 2.5 to 5.5V, VOUT = 1.5V

−3

--

3

%

 

Output Voltage

 

0A < IOUT < 600mA

 

 

Fix

 

 

 

 

 

 

 

Accuracy

VOUT

VIN = 2.5 to 5.5V, VOUT = 1.8V

−3

--

3

%

 

 

 

 

 

0A < IOUT < 600mA

 

 

 

 

V

VIN = VOUT + V to 5.5V

(Note 5)

−3

--

3

%

 

 

 

OUT

VOUT = 2.5V, 0A < IOUT < 600mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT

VIN = VOUT + V to 5.5V

(Note 5)

−3

--

3

%

 

 

 

VOUT = 3.3V, 0A < IOUT < 600mA

 

 

 

 

 

 

 

 

 

 

 

VOUT

VIN = VOUT + 0.2V to 5.5V

 

3

--

3

%

 

 

 

0A < IOUT < 600mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To be continued

 

 

 

 

 

 

 

 

 

 

www.richtek.com

 

 

 

 

 

DS8009-07 March 2011

4

 

 

 

 

 

 

 

 

 

RT8009

Parameter

Symbol

Test Conditions

Min

Typ

Max

 

Unit

 

 

 

 

 

 

 

 

 

 

 

Output Voltage

 

Adjustable

VOUT

VIN = VOUT + V to 5.5V (Note 5)

3

--

3

%

Accuracy

 

 

 

0A < IOUT < 600mA

 

 

 

 

 

 

FB Input Current

 

IFB

VFB = VIN

−50

--

50

 

nA

RDS(ON) of P-Channel MOSFET

RDS(ON)_P

IOUT = 200mA

VIN = 3.6V

--

0.3

0.65

 

Ω

VIN = 2.5V

--

0.4

0.80

 

 

 

 

 

 

 

 

RDS(ON) of N-Channel MOSFET

RDS(ON)_N

IOUT = 200mA

VIN = 3.6V

--

0.25

0.55

 

Ω

VIN = 2.5V

--

0.35

0.65

 

 

 

 

 

 

 

 

P-Channel Current Limit

ILIM_P

VIN = 2.5V to 5.5 V

1

--

1.8

 

A

EN High-Level Input Voltage

VEN_H

VIN = 2.5V to 5.5V

1.5

--

--

 

V

EN Low-Level Input Voltage

VEN_L

VIN = 2.5V to 5.5V

--

--

0.4

 

V

Under Voltage Lockout Threshold

 

 

 

--

1.8

--

 

V

 

 

 

 

 

 

 

 

 

 

Hysteresis

 

 

 

 

--

0.1

--

 

V

 

 

 

 

 

 

 

 

Oscillator Frequency

fOSC

VIN = 3.6V, IOUT = 100mA

0.8

1.25

1.85

 

MHz

Thermal Shutdown Temperature

TSD

 

 

--

160

--

 

°C

Min. On Time

 

 

 

 

--

50

--

 

ns

 

 

 

 

 

 

 

 

 

Max. Duty Cycle

 

 

 

 

100

--

--

%

 

 

 

 

 

 

 

 

 

 

 

LX Leakage Current

 

 

VIN = 3.6V, VLX = 0V or VLX = 3.6V

1

--

1

 

μ

 

 

 

 

 

 

 

 

A

Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. 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 for extended periods may remain possibility to affect device reliability.

Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard.

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

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

Note 5. V = IOUT x RDS(ON)_P

DS8009-07 March 2011

www.richtek.com

 

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