Richtek RT8010-10GQW, RT8010-10PQV, RT8010-10PQW, RT8010-12GQW, RT8010-12PQV Schematic [ru]

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RT8010/A

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

General Description

The RT8010/A is a high efficiency Pulse-Width-Modulated (PWM) step-down DC/DC converter . Ca pable of delivering 1A output current over a wide input voltage range from

2.5V to 5.5V, the RT8010/A 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 availa ble including : PWM/LowDropout autoswitch and shutdown modes. The Internal synchronous rectifier with low R conduction loss at PWM mode. No external Schottky diode is required in practical a pplication.

The RT8010/A enters Low Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET . RT8010/A enter shut-down mode and consumes less than 0.1 μA when EN pin is pulled low.

dramatically reduces

DS(ON)

Features



2.5V to 5.5V Input Range





 Output V oltage (Adjustable Output From 0.6V to V



` RT8010 : 1V, 1.2V, 1.5V, 1.6V, 1.8V, 2.5V and 3.3V

Fixed/Adjustable Output Voltage

` RT8010A Adjustable Output Voltage Only



 1A Output Current



 95% Efficiency



 No Schottky Diode Required



 1.5MHz Fixed-Frequency PWM Operation



 Small 6-Lead WDFN and 16-Lead WQFN Package



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



Applications

 Mobile Phones  Personal Information Appliances  Wireless and DSL Modems  MP3 Players  Portable Instruments

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 W DF N-6L 2x2 and WQFN-16L 3x3 package provides small PCB area a pplication. Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection.

Ordering Information

RT8010/A(- )

Package Type QW : WDFN/WQFN (W-Type)

Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free)

Output Voltage

Pin Configurations

(TOP VIEW)

GND

VIN

1 2 3

FB/VOUT

GND

WDFN-6L 2x2 (RT8010)

GND GND

FB/VOUT

WQFN-16L 3x3 (RT8010A)

Marking Information

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

DS8010/A-09 September 2012 www.richtek.com

LXLXLX

13141516

VIN

12 11

VIN

VIN VIN

8765

1 2 3 4

GND

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.

Default : Adjustable (RT8010/A) Fixed (RT8010) 10 : 1.0V 12 : 1.2V 15 : 1.5V 16 : 1.6V 18 : 1.8V 25 : 2.5V 33 : 3.3V

WQFN-16L 3x3 WDFN-6L 2x2

)

RT8010/A

Typical Application Circuit

2.5V to 5.5V

⎛

⎜

REFOUT

⎝

⎞

1 x VV

⎟

⎠

4.7µF

VIN

RT8010/A

EN VOUT

GND

2.2µH

Figure 1. Fixed V oltage Regulator

4.7µF

VIN

RT8010/A

EN FB

GND

2.2µH

OUT

10µF

OUT

10µF

OUT

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 V oltage Regulator

Layout Guide

RT8010/A_FIX

VIN

CIN must be placed to the VIN as close as possible.

Layout note :

1. The distance that C

2. C

should be placed near RT8010/A.

OUT

VOUT

GND

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

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

Output capacitor must be near RT8010

OUT

-6

and 6x10

Figure 3

-6

for component selection.

RT8010/A_ADJ

VIN

CIN must be placed to the VIN as close as possible.

GND

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

Output capacitor must be near RT8010/A

OUT

DS8010/A-09 September 2012www.richtek.com

Functional Pin Description

Pin No.

RT8010 RT8010A

1 6, 8, 16 IC 2 7 EN

3 9, 10, 11, 12 VIN Power Input. (Pin 9 and Pin 10 must be c onnected with Pin 11). 4 13, 14, 15 LX Pin for Switching. (Pin 13 m ust be c onnected with Pin 14). 5 1, 2, 3, 5 GND Ground. 6 4 FB/VOUT Feedback/Output Voltage.

Pin Name Pin Function

RT8010/A

Internal Connection. Leave floating and do not make connection to this pin. Chip Enable ( Active High).

7 (Expo sed Pad) 17 (Exposed Pad) GND

Function Block Diagram

Slope

Compensation

FB/VOUT

Error

Amplifier

COMP

Ground. The exposed pad must be soldered to a large PCB and connec ted to GND for maximum thermal dissipation.

EN VIN

OSC &

Shutdown

Control

Current

Sense

PWM

Comparator

UVLO &

Power Good

Detector

REF

Current

Limit

Detector

Control

Logic

Driver

RS1

RS2

GND

DS8010/A-09 September 2012 www.richtek.com

RT8010/A

Absolute Maximum Ratings (Note 1)

 Supply Input V oltage------------------------------------------------------------------------------------------------- 6.5V  EN, FB Pin Voltage -------------------------------------------------------------------------------------------------- −0.3V to V  LX Pin Switch Voltage ----------------------------------------------------------------------------------------------- −0.3V to (V

<20ns ------------------------------------------------------------------------------------------------------------------- −4.5V to 7.5V

 LX Pin Switch Current ----------------------------------------------------------------------------------------------- 2A  Power Dissipation, P

@ TA = 25°C

WDFN-6L 2x2 --------------------------------------------------------------------------------------------------------- 0.833W WQFN-16L 3x3 ------------------------------------------------------------------------------------------------------- 1.47W

 Package Thermal Re sistance (Note 2)

W DFN-6L 2x2, θJA---------------------------------------------------------------------------------------------------- 120°C/W WDFN-6L 2x2, θJC--------------------------------------------------------------------------------------------------- 20°C/W WQF N-16L 3x3, θJA-------------------------------------------------------------------------------------------------- 68°C/W WQFN-16L 3x3, θJC------------------------------------------------------------------------------------------------- 7.5°C/W

 Lead Temperature (Soldering, 10 sec.)-------------------------------------------------------------------------- 260°C  Storage T emperature Range --------------------------------------------------------------------------------------- −65°C to 150°C  Junction T emperature------------------------------------------------------------------------------------------------ 150°C  ESD Susceptibility (Note 3)

HBM (Human Body Model)----------------------------------------------------------------------------------------- 2kV

+ 0.3V)

Recommended Operating Conditions (Note 4)

 Supply Input V oltage------------------------------------------------------------------------------------------------- 2.5V to 5.5V  Junction T emperature Range---------------------------------------------------------------------------------------  Ambient T emperature Range---------------------------------------------------------------------------------------

−40°C to 125°C

−40°C to 85°C

Electrical Characteristics

= 3.6V, V

Input Volt age Ra nge VIN 2.5 -- 5.5 V Qui escent Cu rrent IQ I Shutdown Current I Re f erenc e Volt a ge V Adjustable Output Range V

Output Voltage

Accuracy

= 2.5V, L = 2.2μH, C

OUT

= 4.7μF, C

OUT

= 10μF, T

= 25°C, I

= 1A unless otherwise specified)

MAX

Parameter Symbol Test Conditions Min Typ Max Unit

Fix

= 0mA, VFB = V

OUT

EN = G ND -- 0.1 1 μA

SHDN

For Adjustable Output Voltage 0.588 0.6 0.612 V

REF

(Note 5) V

OUT

= 2.5V to 5.5V, V

0A < I V

0A < I

< 1A

OUT

= 2.5V to 5.5V, V

< 1A

OUT

= 2.5V to 5.5V, V

< 1A

OUT

= 2.5V to 5.5V, V

< 1A

OUT

= 2.5V to 5.5V, V

< 1A

OUT

ΔV

ΔV ΔV

OUT

+ 5% -- 50 70 μA

REF

OUT

= 1V

= 1.2V

= 1.5V = 1.6V

= 1.8V

-- V

REF

−3 -- 3

− 0.2V V

DS8010/A-09 September 2012www.richtek.com

RT8010/A

Parameter Symbol Test Conditions Min Typ Max Unit

= V

ΔV

OUT

Fix

Outpu t Volt age

ΔV

Accuracy

Adjustable

FB I nput Curre nt

P-MOSF ET RON R

N-MOSFET RON R

P-Channel Current Limit EN High-Level Input Voltage EN Low-Level Input Voltage

OUT

ΔV

OUT

DS(ON)_P

DS(ON)_N

LIM_P

VIN = 2.5V to 5.5V

EN_H

VIN = 2.5V to 5.5V

EN_L

OUT

= V

OUT

= V

0A < I

= VIN

OUT

= 2.5V to 5.5 V

+ ΔV to 5.5V (Note 6)

OUT

= 2.5V, 0A < I

+ ΔV to 5.5V (Note 6)

OUT

= 3.3V, 0A < I

+ ΔV to 5.5V (Note 6)

OUT

< 1A

OUT

= 200 mA

OUT

V V V V

IN IN IN IN

< 1A

= 3.6V = 2.5V = 3.6V = 2.5V

−3

-- 3 %

−3

-- 3

-- 3 %

−50 -- 50 nA

-- 0.28 -Ω

-- 0.38 --

-- 0.25 -Ω

-- 0.35 --

1.4 1.5 -- A

1.5 -- -V

-- -- 0.4 Under Voltage Loc k Ou t thr es hold UVLO -- 1.8 -- V Hysteresis -- 0.1 -- V

Oscillator Frequency

Ther m al S hutd own Temper atu re

OSC

= 3.6V, I

OUT

= 100mA

-- 160 --

1.2 1.5 1.8 MHz °C

Ma x . Duty Cy cle 100 -- -- % LX Leakage Curr ent

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. Guarantee by design. Note 6. ΔV = I

is measured at T

measured at the exposed pad of the package.

x P

OUT

RDS(ON)

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

= 3.6V, V

= 0V or V

= 3.6V −1

-- 1

μA

DS8010/A-09 September 2012 www.richtek.com

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