Richtek RT8016-10GQW, RT8016-10PQW, RT8016-12GQW, RT8016-12PQW, RT8016-13GQW Schematic [ru]

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RT8016

1.5MHz, 1A, High Efficiency PWM Step-Down DC/DC Converter

General Description

The RT8016 is a high-efficiency Pulse-Width-Modulated (PWM) step-down DC-DC converter. Capable of delivering 1A output current over a wide input voltage range from 2.5V to 5.5V, the RT8016 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources such as cellular phones, PDAs and hand-held devices.

Two operating modes are available including : PWM/LowDropout autoswitch and shut-down modes, the Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application.

The RT8016 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper PMOS. The RT8016 enters shutdown mode and consumes less than 0.1uA when EN pin is pulled low. The RT8016 also offers a range of 1V to 3.3V with 0.1V per step or adjustable output voltage by two external resistor.

The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operating frequency of 1.5MHz. This along with small WDFN-6L 2x2 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

Features

+2.5V to +5.5V Input Range Adjustable Output From 0.6V to VIN 1A Output Current

95% Efficiency

No Schottky Diode Required

1.5MHz Fixed Frequency PWM Operation Small 6-Lead WDFN Package

RoHS Compliant and 100% Lead (Pb)-Free

Applications

Mobile Phones

Personal Information Appliances

Wireless and DSL Modems

MP3 Players

Portable Instruments

Ordering Information

RT8016-

Package Type

QW : WDFN-6L 2x2 (W-Type)

Lead Plating System P : Pb Free

G : Green (Halogen Free and Pb Free)

Output Voltage Default : Adjustable 10 : 1.0V

11 : 1.1V

:

32 : 3.2V

33 : 3.3V

(TOP VIEW)

GND

1

 

6

FB/VOUT

EN 2

7

5

GND

VIN

3

4

LX

 

WDFN-6L 2x2

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.

Marking Information

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

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS8016-04 February 2012

www.richtek.com

 

1

RT8016

Typical Application Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L

 

 

 

 

VIN

 

 

 

 

 

3 VIN

 

 

 

 

 

 

 

 

LX

4 2.2µH

 

 

 

VOUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.5V to 5.5V

 

 

 

 

CIN

 

RT8016

 

 

 

 

 

 

 

 

 

 

 

 

 

4.7µF

2

6

 

 

 

 

 

 

 

 

 

 

 

 

EN

 

 

 

 

 

VOUT

 

 

 

 

 

 

COUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

10µF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1, 5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 1. Fixed Voltage Regulator

 

 

 

 

L

 

VIN

 

3 VIN

LX

4 2.2µH

VOUT

2.5V to 5.5V

CIN

RT8016

 

C1

 

4.7µF

 

 

 

R1

 

 

2 EN

FB

6

COUT

 

 

10µF

 

 

 

GND

 

 

 

 

IR2

R2

 

 

 

1, 5

 

 

 

 

 

 

VOUT = VREF x 1+ R2R1

with R2 = 300kΩ to 60kΩ so the IR2 = 2μA to 10μA,

and (R1 x C1) should be in the range between 3x10-6 and 6x10-6 for component selection.

 

 

 

 

Figure 2. Adjustable Voltage Regulator

 

 

 

 

Layout Guide

 

 

 

 

 

 

 

 

 

 

RT8016_FIX

 

 

 

RT8016_ADJ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

1

6 VOUT

Output capacitor

GND

1

6

FB

Output

 

 

 

 

 

capacitor

 

 

 

 

 

 

 

 

EN

2

5 GND

 

must be near

EN

2

5

GND

must be near

 

RT8016

RT8016

 

 

 

 

 

L1

 

 

 

 

 

L1

 

 

 

 

 

 

 

 

 

VIN

3

4

LX

 

 

VIN

3

4 LX

 

 

 

 

 

 

 

 

 

 

 

R1

 

 

 

 

COUT

 

 

 

COUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LX should be

 

 

 

 

 

 

 

 

 

 

 

 

 

CIN

 

 

 

CIN

 

connected to

 

R2

 

LX should be connected

 

 

 

Inductor by wide

 

 

 

 

CIN must be placed

 

 

 

 

 

 

 

to Inductor by wide and

CIN must be placed

and short trace,

 

 

 

 

between VDD and

short trace, keep

between VDD and

 

keep sensitive

 

 

 

 

GND as close as

sensitive compontents

 

compontents away

 

 

 

 

GND as close as

 

 

 

 

 

possible

away from this trace

 

from this trace

 

 

 

 

possible

 

 

 

 

 

 

 

 

 

 

 

 

Layout note:

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

2.COUT should be placed near RT8016.

Figure 3. Layout Guide for RT8016

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS8016-04 February 2012

2

Richtek RT8016-10GQW, RT8016-10PQW, RT8016-12GQW, RT8016-12PQW, RT8016-13GQW Schematic

RT8016

Functional Pin Description

Pin No.

Pin Name

Pin Function

2

EN

Chip Enable (Active High).

3

VIN

Power Input.

4

LX

Pin for Switching.

1, 5

GND

Ground Pin.

6

FB/VOUT

Feedback/Output Voltage Pin.

7 (Exposed Pad)

NC

No Internal Connection. The exposed pad must be soldered to a large PCB and

connected to GND for maximum power dissipation.

 

 

Function Block Diagram

 

 

EN

 

 

VIN

 

 

OSC &

 

 

RS1

 

 

Current

 

 

 

 

Shutdown

 

 

 

 

Limit

 

 

 

 

Control

 

 

 

 

Detector

 

 

 

Slope

 

 

 

 

 

 

 

 

 

Compensation

Current

 

 

 

 

 

 

 

 

 

 

Sense

 

 

 

 

 

 

Control

Driver

LX

 

 

PWM

Logic

 

 

 

 

Mux

 

 

 

 

FB/VOUT

Error

Comparator

 

 

 

Current

 

 

Amplifier

 

 

 

 

 

 

Source

 

 

RC

 

 

 

 

 

 

Controller

 

 

 

 

 

 

 

COMP

UVLO &

 

Current

 

 

Power Good

 

 

 

 

 

Detector

RS2

 

 

Detector

VREF

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS8016-04 February 2012

www.richtek.com

3

RT8016

Absolute Maximum Ratings (Note 1)

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

6.5V

EN, FB Pin Voltage -------------------------------------------------------------------------------------------------------

−0.3V to VIN

Power Dissipation, PD @ TA = 25°C

 

WDFN-6L 2x2 --------------------------------------------------------------------------------------------------------------

0.606W

Package Thermal Resistance (Note 2)

 

WDFN-6L 2x2, θJA ---------------------------------------------------------------------------------------------------------

165°C/W

WDFN-6L 2x2, θJC --------------------------------------------------------------------------------------------------------

20°C/W

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

260°C

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

−65°C to 150°C

Junction Temperature -----------------------------------------------------------------------------------------------------

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 = 0.6V, L = 2.2μH, CIN = 4.7μF, COUT = 10uF, TA = 25°C, IMAX = 1A 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

70

μA

Shutdown Current

ISHDN

EN = GND

 

 

--

0.1

1

μ

 

 

 

 

 

 

 

 

A

Reference Voltage

VREF

For Adjustable Output Voltage

0.588

0.600

0.612

V

 

 

 

 

 

 

 

 

 

 

Adjustable Output Range

VOUT

(Note 6)

 

 

VREF

--

VIN − 0.2V

V

 

Fix

VOUT

VIN = (VOUT +

V) to 5.5V or

−3

--

3

%

Output Voltage

VIN > 2.5V which ever is larger.

 

 

(Note 5)

 

 

 

 

 

 

Accuracy

Adjustable

VOUT

VIN = VOUT +

V to 5.5V (Note 5)

3

--

3

%

 

 

0A < IOUT < 1A

 

 

 

 

 

 

 

 

 

 

 

FB Input Current

IFB

VFB = VIN

 

 

−50

--

50

nA

P-MOSFET RON

RDS(ON)_P

IOUT = 200mA

 

VIN = 3.6V

--

0.28

--

Ω

 

VIN = 2.5V

--

0.38

--

 

 

 

 

 

 

N-MOSFET RON

RDS(ON)_N

IOUT = 200mA

 

VIN = 3.6V

--

0.25

--

Ω

 

VIN = 2.5V

--

0.35

--

 

 

 

 

 

 

P-Channel Current Limit

ILIM_P

VIN = 2.5V to 5.5 V

1.4

2

2.6

A

EN High-Level Input

VEN_H

 

 

 

1.5

--

VIN

V

Voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

 

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

 

 

 

 

 

DS8016-04 February 2012

4

 

 

 

 

 

 

 

 

 

RT8016

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

 

EN Low-Level Input Voltage

VEN_L

 

--

--

0.4

V

Under Voltage Lock Out threshold

UVLO

 

--

1.8

--

V

 

 

 

 

 

 

 

Hysteresis

 

 

--

0.1

--

V

 

 

 

 

 

 

 

Oscillator Frequency

fOSC

VIN = 3.6V, IOUT = 100mA

1.2

1.5

1.8

MHz

Thermal Shutdown Temperature

TSD

 

--

160

--

°C

Max. Duty Cycle

 

 

100

--

--

%

 

 

 

 

 

 

 

LX Current Source

 

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

1

--

100

μ

 

 

 

 

 

A

Minimum On-Time

tON

 

--

120

140

ns

 

 

 

 

 

 

 

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. θJA is measured at TA = 25°C on a single-layer and four-layer test board of JEDEC 51. The measurement case position of θJC is on the lead of the package.

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. V = IOUT x PRDS(ON)

Note 6. Guarantee by design.

Note 7. The start up time is about 300μs.

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS8016-04 February 2012

www.richtek.com

 

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