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/Low-

Dropout autoswitch and shut-down modes, the Internal

synchronous rectifier with low R

dramatically reduces

DS(ON)

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 shut-

down 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

(TOP VIEW)

GND

VIN

WDFN-6L 2x2

FB/VOUT

GND

Features



+2.5V to +5.5V Input Range





 Adjustable Output From 0.6V to V



 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

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.

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

DS8016-04 February 2012 www.richtek.com

RT8016

Typical Application Circuit

2.5V to 5.5V

4.7µF

VIN

RT8016

VOUT

GND

1, 5

2.2µH

Figure 1. Fixed Voltage Regulator

4.7µF

VIN

RT8016

EN FB

GND

1, 5

2.2µH

OUT

10µF

OUT

⎛

⎜

REFOUT

⎝

⎞

1 x VV

⎟

⎠

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

and (R1 x C1) should be in the range between 3x10

Figure 2. Adjustable Voltage Regulator

Layout Guide

RT8016_FIX

GND

VIN

between V GND as close as possible

Layout note:

1. The distance that C

2. C

should be placed near RT8016.

OUT

VOUT

GND

must be placed

and

connects to VIN is as close as possible (Under 2mm).

Output capacitor must be near RT8016

OUT

LX should be connected to Inductor by wide and short trace, keep sensitive compontents away from this trace

-6

and 6x10

-6

for component selection.

RT8016_ADJ

GND

VIN

CIN must be placed

between V GND as close as possible

and

GND

LX should be connected to Inductor by wide and short trace, keep sensitive compontents away from this trace

Output capacitor must be near RT8016

OUT

Figure 3. Layout Guide for RT8016

DS8016-04 February 2012www.richtek.com

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

RT8016

FB/VOUT

Slope

Compensation

Error

Amplifier

COMP

OSC &

Shutdown

Control

Current

Sense

PWM

Comparator

UVLO &

Power Good

Detector

RS1

Current

Limit

Detector

Control

Logic

REF

Controller

GND

Driver

Current

Source

Current

Detector

Mux

RS2

DS8016-04 February 2012 www.richtek.com

RT8016

Absolute Maximum Ratings (Note 1)

 Supply Input Voltage ------------------------------------------------------------------------------------------------------ 6.5V

 EN, FB Pin Voltage ------------------------------------------------------------------------------------------------------- −0.3V to V

 Power Dissipation, P

@ 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 --------------------------------------------------------------------------------------------

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

−40°C to 125°C

−40°C to 85°C

Electrical Characteristics

= 3.6V, V

Input Voltage Range

Quiescent Current IQ I

Shutdown Current

Reference Voltage

Adjustable Output Range

Output Voltage Acc uracy

FB Input Current

P-MOSFET RON R

N-MOSFET RON R

P-Channel Current Limit

EN High-Level Input Voltage

OUT

= 2.5V, V

= 0.6V, L = 2.2μH, C

REF

= 4.7μF, C

OUT

= 10uF, T

= 25°C, I

= 1A unless otherwise specified)

MAX

Parameter Symbol Test Conditions Min Typ Max Unit

2.5 -- 5.5 V

= 0mA, VFB = V

OUT

EN = GND -- 0.1 1

+ 5% -- 50 70 μA

REF

For Adjustable Output Voltage 0.588 0.600 0.612 V

(Note 6 )

= (V

> 2.5V which ever is larger.

+ ΔV) to 5.5V or

OUT

REF

−3

− 0.2V

-- 3 %

Fix

SHDN

REF

OUT

ΔV

OUT

(Note 5)

Adjustable

ΔV

OUT

DS(ON)_P

DS(ON)_N

LIM_P

EN_H

0A < I

OUT

1.5 --

= V

= 2.5V to 5.5 V

+ ΔV to 5.5V (Note 5)

OUT

OU T

< 1A

−3

= VIN −50

= 200mA

= 3.6V

= 2.5V

= 3.6V

= 2.5V

-- 0.28 --

-- 0.38 --

-- 0.25 --

-- 0.35 --

1.4 2 2.6 A

-- 3 %

-- 50 nA

VIN

DS8016-04 February 2012www.richtek.com

μA

RT8016

Parameter Symbol Test Conditions Min Typ Max Unit

EN Low-Level Input Voltage V

-- -- 0.4 V

EN_L

Under Voltage Lock Out threshold UVLO -- 1.8 -- V

Hyster es i s -- 0.1 -- V

Oscillator Frequency

Thermal Shutdown Temperature

OSC

= 3.6V, I

OU T

= 100mA

-- 160 -- °C

1.2 1.5 1.8 MHz

Max. Duty Cycl e 100 -- -- %

LX Current Source

= 3.6V, V

= 0V or V

= 3.6V

1 -- 100

μA

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. θ

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. ΔV = I Note 6. Guarantee by design. Note 7. The start up time is about 300μs.

is measured at T

is on the lead of the package.

of θ

x P

OUT

RDS(ON)

= 25°C on a single-layer and four-layer test board of JEDEC 51. The measurement case position

DS8016-04 February 2012 www.richtek.com

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