Richtek RT9480GQW Schematic [ru]

RT9480

Eas y t o U s e Power Bank Solution (EZPBSTM) Integrated Chip with Two Ports Output

General Description

The RT9480 is a high integration and easy to use power solution for Li-ion power bank a nd other powered handheld applications. We call it EZPBSTM (Easy to Use Power Bank Solution). This single chi p includes a linear charger, a synchronous Boost with dual output load management and a torch function support. The battery volume a nd the state of charging and discharging can be indicated by 4LEDs. The RT9480 is available in the WQFN-24L 4x4 package.

Applications

 Li-ion Power Bank

Ordering Information

RT9480

Serial Number Package Type QW : WQFN-24L 4x4 (W-Type) (Exposed Pad-Option 2)

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

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

EZPBS



 Compact BOM Elements with EZPBS



 Protection Functions (OTP, OVP, OCP, VBUS and



Output Short Protection)



 Support Charging and Discharging at the sa me time



by Smart Algorithm

Charger



 One Linear Charger up to 1.2A



 DPM Function (Dynamic Power Management)



 Thermal Regulation



 Auto-Recharge



 Support JEITA Function



USB Output



 Support Dual USB Output



 Auto and Button Control



 Sync-Boost T otal Output Current up to 2.5A





 Peak Efficiency 97%



Battery State of Charge (SOC) Indicator



 Battery SOC Detection



 Support NTC for Battery Temperature Sensing



 4LEDs for Battery SOC Display



Other Functions



 T orch Functions



(Easy to Use Power Bank Solution)

Single Chip

Simplified Application Circuit

Input Power

Battery

VMID

VBUS

LXBST

VMID SWIN2

BUTTON

RT9480

DS9480-04 December 2014 www.richtek.com

VBAT

USBOUT1 USBOUT2

LEDx

TORCH

GND

Battery

BAT

USB Port 1 USB Port 2 LED Indicator

Torch Function

RT9480

Pin Configurations

(TOP VIEW)

Marking Information

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

LXBST

VMID

LXBST

21 20 1924 2223

USBOUT1

SWIN2

TORCH

USBOUT2

TP2

TP1

BUTTON

VBAT

TS LED1 LED2 LED3 LED4

VBUS

PGNDBST

1 2 3 4 5 6

78910 1211

PGNDBST

GND

WQFN-24L 4x4

Product Name List

Serial

Number

Product Name Auto/Button

RT9480GQW Button 4LEDs Disable 4.2V 12 Hours

SOC LED

Number

Programmable

Battery

Regulation

USBOUT Detach

Time Out of

AA01 RT9480GQW-AA01 Auto 4LEDs Disable 4.2V 3sec AA02 RT9480GQW-AA02 Button 4LEDs Disable 4.35V 12 Hours AA03 RT9480GQW-AA03 Button 4LEDs Disable 4.2V 3sec AB01 RT9480GQW-AB01 -- -- Enable -- --

* : Please refer to application note.

-- : Set by program

DS9480-04 December 2014www.richtek.com

Functional Pin Description

Pin No. Pin Name Pin Function

1 VBAT Battery Char ge Cur r ent O utput . 2 TS Battery Temperature Sense Setting. 3 LED1 Current Si nk Output for LE D1. 4 LED2 Current Si nk Output for LE D2. 5 LED3 Current Si nk Output for LE D3. 6 LED4 Current Si nk Output for LE D4.

7, 8, 14 NC No Internal Connection.

25 (Exposed Pad)

10 TORCH Current Si nk Output for Tor c h LE D Function. Open Drain Output 1 1 BUTTON Button Control Input for mode change. 12 TP1 Connected to GND. 13 TP2 Connected to GND. 15 USBOUT2 USB-2 Power Output .

GND

Ground. The exposed pad must be soldered to a large PCB and connected to G ND for maxim um power di ssipat ion.

RT9480

16 SWIN2 USB-2 Power Input.

17, 18 USBOUT1 USB-1 Power Output .

19 VMID Boost Output. 20, 21 LXBST Boost Switch Output. 22, 23 PGNDBST Boost Power GND.

24 VBUS VBUS Power Supply.

DS9480-04 December 2014 www.richtek.com

RT9480

Function Block Diagram

VBUS

USBOUT1

USBOUT2

SWIN2

VMID

LXBST

PGNDBST

BUTTON

TORCH

Linear Charger 1.2A

USB-1 Load

Manager Up to 2.1A

USB-2 Load

Manager Up to 1A

Torch Brightness

Control (Open Drain)

Central Control

1. Battery Capacity Detection

2. Protection

3. LED Display

4. Mode Control

5. Button Operation

VBAT

LED1 LED2

LED3 LED4

TP1 TP2

GND

DS9480-04 December 2014www.richtek.com

Operation

RT9480

The RT9480 is a high integrated IC for Li-Ion battery power bank. It includes a linear charger 1.2A, a synchronous Boost 5.1V , two output loa d ma nagement, LED indicator and torch function.

Change Current

Ba se on thermal regulation function, the charging current can support up to 1.2A.

VBUS OVP

If the input voltage (VBUS) is higher than the threshold voltage V charger will stop charging until VIN is below V

, the internal OVP signal will go high a nd the

OVP

− ΔV

OVP

VMID OVP

If the internal voltage (VMID) is higher than the threshold voltage V

, the internal OVP signal will go high a nd the

OVP

charger will stop charging until VMID is below V

OVP

−ΔV

OVP

OCP

The converter senses the current signal when the highside P-MOSFET turns on. As a result, The OCP is cycle by-cycle current limitation. If the OCP occurs, the converter holds off the next on pulse until inductor current drops below the OCP limit.

OTP

The converter has a n over-temperature protection. When the junction temperature is higher than the thermal shutdown rising threshold, the system will be latched and the output voltage will no longer be regulated until the junction temperature drops under the falling threshold.

Output Short Protection

When output short to ground, the system will be latched and the output voltage will no longer be regulated until power reset.

CC/CV/TR Multi Loop Controller

There are constant current loop, consta nt voltage loop and thermal regulation loop to control the charging current.

T oo Hot or Too Cold

The temperature sense input TS pin can be connected a thermistor to determine whether the battery is too hot or too cold for charging operation. If the battery's temperature is out of range, charging is paused until it re-enters the valid range.

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RT9480

Absolute Maximum Ratings (Note 1)

 Supply Voltage, VBAT-------------------------------------------------------------------------------------- −0.3V to 6V  Supply Voltage, VBUS ------------------------------------------------------------------------------------- −0.3V to 10V  Supply V oltage USBOUT1, USBOUT2 Pulse (100μs)---------------------------------------------- −0.3V to 10V  LED Output Voltage, LED1, LED2, LED3, LED4 ---------------------------------------------------- −0.3V to 10V  TORCH--------------------------------------------------------------------------------------------------------- −0.3V to 10V  Other Pins----------------------------------------------------------------------------------------------------- −0.3V to 6V  Power Dissipation, P

WQFN-24L 4x4 ---------------------------------------------------------------------------------------------- 3.57W

 Package Thermal Re sistance (Note 2)

WQFN-24L 4x4, θJA-----------------------------------------------------------------------------------------28°C/W WQFN-24L 4x4, θJC----------------------------------------------------------------------------------------7.1°C/W

 Junction T emperature Range------------------------------------------------------------------------------ 150°C  Lead T e mperature (Soldering, 10 sec.)-----------------------------------------------------------------26 0°C  Storage T emperature Range ------------------------------------------------------------------------------ −65°C to 150°C  ESD Susceptibility (Note 3)

HBM (Human Body Model)-------------------------------------------------------------------------------- 2kV MM (Machine Model) --------------------------------------------------------------------------------------- 200V

@ TA = 25°C

Recommended Operating Conditions

 Supply Input V oltage, VBAT, VBUS ---------------------------------------------------------------------2.8V to 5.5V  Junction T emperature Range------------------------------------------------------------------------------ −40°C to 125°C  Ambient T emperature Range------------------------------------------------------------------------------ −40°C to 85°C

(Note 4)

Electrical Characteristics

TOP Unit Electrical Characteristics

= 5V, V

BUS

Supply Input

Battery Quiescent Current for Standby

= 3.7V, T

BAT

= 25°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

BAT_sdy

No VBUS, Boost on, Indicator Off.

Button Mode -- 30 -- A

DS9480-04 December 2014www.richtek.com

Charger Unit Electrical Characteristics

BUS

= 5V, V

= 3.7V, T

BAT

= 25°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Supply Input

VBUS  VBAT VOS Ri sing V VBUS  VBAT VOS Falling V

-- 100 200 mV

OS_H

10 50 -- mV

OS_L

Battery Charger VBUS Operating Range V

BUS_CHG

4.5 -- 5.5 V

VBUS Regulati on DPM V

Voltage Regulation

VBAT Regulation V Re-Charge Threshold V VBUS Power FET R

DS(ON)

REG

RECHG

DS(ON)_chg IBAT

Current Regulation

Fast-Charge Current A c c ur ac y I Pre-Charge Current Accuracy I Pre-Charge Threshold V Pre-Charge Threshold

Hysteresis

CHG CHG_Pre

pre

V

Ratio of Fast-Char ge Cur rent 5.5 10 14.5 %

pre

Charge Termination Detection

Termination Current Ratio I

-- 10 -- %

TERMI

Timer

RT9480

= 4.5V 5 -- 5 %

DPM

= 0 to 85C, V

 Recharge Level -- 150 -- mV

REG

= 1A -- 200 300 m

= 1.2A 5 -- 5 %

CHG

Rising 2.35 2.5 2.65 V

BAT

Falling 120 200 280 mV

BAT

= 4.2V 1 -- 1 %

REG

Fast-Charge Time Fault T

-- 24 -- hour

F_CC

Boost Unit Electrical Characteristics

BUS

= 5V, V

= 3.7V, T

BAT

= 25°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Supply Input

Output Voltage V Output Voltage Accuracy V

OUTBST OUTBST

MAX Output Current As V PFET Peak Current Limit I

OCP

-- 5.1 -- V 5 -- 5 %

BAT

> 3.3V, V

= 5V -- 2.5 -- A

OUT

6 -- -- A

Power Switch

Switching Frequency fSW 0.2 0.25 0.3 MHz

Protection

Over-Volt age Protection V Over-Volt age Protection

Hysteresis Under-Volt age P r otection

(Short-Circuit Protection)

MID_OVP

MID_O VP_hys

BST_FBUV

5.6 5.7 6 V

-- 0.2 -- V

-- 3.37 -- V

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RT9480

Others Electrical Characteristics

BUS

LED

= 5V, V

= 3.7V, T

BAT

= 25°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

LED Current Sink I Torch Open-Drain Low Voltage V

Button

Logic-High V

Button Contr ol

Logic-Low V

Press Duty Time

High-Level T Low-Level T

Protection

Charger Thermal Regulation T Over-Tem per ature P r otect T

Over-Tem per ature P r otect Hysteresis

VBUS OVP Threshold Voltage V VBUS OVP Threshold Voltage

Hysteresis

BASE

VBUS Attached Threshold Voltage

VBUS Attached Threshold Voltage Hyster esi s

-- 0.75 -- mA

LED

ODL_T

1.5 -- -- V

IH_B

-- -- 0.4 V

IL_B Press_H Press_L

REG OTP

T

OVP

OVP_Hys

BUS_ATT

BUS_ATT_Hys

0.1 -- -- sec

For Charger -- 105 -- °C

-- 150 -- °C

-- 20 -- °C

OTP

= 5mA -- 200 -- mV

SINK

Rising 6.5 6.8 7.1 V

BUS

Falling -- 200 280 mV

BUS

Rising 3.8 4 4.2 V

BUS

Falling -- 200 280 mV

BUS

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.

is measured at T

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

DS9480-04 December 2014www.richtek.com

Typical Application Circuit

VMID

100k 100k

20, 21

22, 23

12 13

VBUS

SWIN2

VMID

LXBST

PGNDBST

BUTTON TP1 TP2

Input Power

BAT

1µH

C1 10µF

Button

C 1µF/25V

C 22µF x2

R2 R3

RT9480

USBOUT1

USBOUT2

VBAT

LED1

LED2

LED3

LED4

TORCH

17, 18

BAT

10µF

OUT1

1µF

OUT2

1µF

USB1 Output

USB2 Output

BAT

Display

VMID

Power

Li-Bat

Prot-IC

RT9480

NTC

10k

Semitec

103AT

N-MOSFET

9, 25 (Exposed Pad)

GND

DS9480-04 December 2014 www.richtek.com

RT9480

)

Typical Operating Characteristics

USBOUT Efficiency vs. Load Current

100

90 80 70 60 50 40

Eff iciency (%)

30 20 10

0 500 1000 1500 2000 2500

USBOUT = 5.1V, L = 1μH, C

BAT

Load Current (mA)

USBOUT V ol tage vs. Temperature

5.5

5.4

5.3

5.2

5.1

5.0

4.9

4.8

Output Voltage (V)

4.7

4.6

4.5

-50 -25 0 25 50 75 100 125

= 3.3V

BAT

= 3.7V

BAT

= 3.9V

BAT

Temperature (°C)

USBOUT = 5.1V

= 3.9V

= 3.7V

= 3.3V

= 1μF

OUT

USBOUT Voltage vs. Load Current

6.0

5.5

5.0

= 3.3V

BAT

= 3.7V

4.5

4.0

BAT

= 3.9V

BAT

Output Voltage (V)

3.5

3.0 0 500 1000 1500 2000 2500

USBOUT = 5.1V

Load Current (mA)

VBUS OVP Threshold Voltage vs. Tempe rature

7.2

7.0

6.8

6.6

6.4

6.2

OVP Threshol d Voltage (V)

6.0

-50 -25 0 25 50 75 100 125

Rising

Falling

VBAT = Real Battery

Tempera ture (°C)

Battery Regulation Voltage vs. Temperature

4.25

4.22

105°C

4.19

4.16

4.13

Battery Regulation V oltage (V) 1

VIN = 5V , VB AT = Real Battery

4.10

-50 -25 0 25 50 75 100 125

Temperatur e (°C)

ICHG Thermal Regulation vs. Temperature

1300 1200 1100 1000

900 800 700 600 500 400 300 200

ICHG Thermal Regulat ion (mA

100

VIN = 5V , VB AT = Real Battery

-50 -25 0 25 50 75 100 125

Temperatur e (°C)

DS9480-04 December 2014www.richtek.com

Application Information

RT9480

The RT9480 is a high integrated IC for Li-Ion battery power bank. This chi p includes a linear charger , a synchronous Boost, two output load management, LED indicator and torch function.

Pre-Charge Mode

When the output voltage is lower than 2.3V, the charging current will be reduced to a fast-charge current ratio to protect the battery life time.

Fast-Charge Mode

When the output voltage is higher than 2.5V, the charging current will be equal to the fast-charge current with 1.2A.

Constant-Voltage Mode

When the output voltage is near 4.2V or 4.35V , the charging current will fall below the termination current.

Re-Charge Mode

When the chip is in charge termination mode, the charging current will gradually go down to zero. However, once the voltage of the battery drops to below 4.05V or 4.2V, then the charging current will resume again.

battery in order to maintain thermal regulation at around 105°C. This operation continues until the junction temperature falls below the thermal regulation threshold (105°C) by the hysteresis level. This feature prevents the maximum power dissipation from exceeding typical design conditions.

Time Fault

The Fast-Charge Fault T i me is set by 24hours. When time fault ha ppens, the charger cycle will be turned

off charging function.

Battery Pack Temperature Monitoring

The RT9480 features an extern al battery pack temperature monitoring input. The TS input connects to the NTC thermistor in the battery pack to monitor battery temperature and prevent danger over temperature conditions. If at any ti me the voltage at TS falls outside of the operating range, charging will be suspended. The NTC thermistor recommends using 10kΩ.

JEIT A Function

For JEIT A battery temperature sta ndard :

Charge Termination

When the charge current is lower than the charge termination current ratio (10%) for V

> 4.05V or 4.2V

BAT

and the time is larger tha n the deglitch time (25ms), it will be latched high unless the power is re-toggled.

Input DPM Mode

If the input voltage is lower than V

(4.5V), the input

DPM

current limit will be reduced to stop the input voltage from dropping any further . This can prevent the IC from da maging improperly configured or inadequately designed USB sources.

Temperature Regulation

In order to maximize charge rate, the RT9480 features a junction temperature regulation loop. If the power dissipation of the IC results in junction temperature greater than the thermal regulation threshold (105°C), the R T9480 will cut back on the charge current a nd disconnect the

CV regulation voltage will change at the f ollowing battery T emp ra nges 45°C to 60°C.

4.35V or 4.2V

4.2V or 4.05V

100% Ichg

50% Ichg

010 4560

C C

Synchronous Step-Up

The converter operates in fixed frequency PWM Mode with 250kHz, Continuous Current Mode (CCM), and Discontinuous Current Mode (DCM) with internal MOSFETs.

DS9480-04 December 2014 www.richtek.com

RT9480

Operation Method

Charge Mode : VBUS in and charging battery Discharge Mode : USBOUT in and discharging for ha ndheld Chg-Dchg Mode : VBUS and USBOUT in, charging battery

and discharging ha ndheld at the sa me tim e

Button Mode

Button mode : When external handheld device plug in f or power bank, the USBOUT will turns on by button.

If device attched, RT9480 will count 12 hours (RT9480GQW or AA02) or 3sec (AA01 or AA03) to turn off USBOUT after deta ch.

Relax Mode : VBUS and USBOUT plug out

 AA01 and AA03. Plea se reference Product N a me List.  Attach mea n device plug in a nd loading > 100mA.  Detach mea n device plug out and loa ding < 50mA.

Button Function

Function Button Action Description

After plugging in t he exter nal power sour c e, the power Micro-USB Adapter plug-in : ON

Charging NA

Micro-USB Adapter plug-out : OFF

bank will be charged aut omatically without pressing the

button, and the LE D batt er y indicator lights up at the

same time.

After unplugging t he exter n al power source, the power

bank stops being charged automatically wit h out pressing

the button, and t he LED battery indicat or fades out at the

same time.

After plugging in t he H/H dev ic e and pr essing the button,

the power bank starts to charge the device.

After unplugging the H/H device, the power bank stops

charging the dev ic e automatically without pressing the

Discharging

0.1s

USB slave plug-in : ON

USB slave plug-out : OF F

button.

Check Battery

Capacity

Torch

0.1s

0.1s 0.1s

Press the button (short press) one time : ON

After 20sec : OFF After 20sec, the LED batt er y indicator fades out. Double clic k the butt o n

(short press) : ON Double clic k the butt o n

(short press : OFF

Press the button (short pres s), the LED battery indicator

lights up.

Double click the button (short press), the torch light li ghts

up.

Double click the button (short press) again, the torch light

fades out.

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RT9480

BUTTON Press Timing

Define Button (Short/Long) Press Timing

Short press = min (0.1s)

Blank = min (0.1s)

SOC LED Flash and Running Timing

SOC LED Fla sh

0.5s

SOC LED Running

LED Indicator Function

About LED indicator, it will follow below table to show SOC. The LED current is 0.75mA.

●●●●

Low→High

● : LED ON, ○ : LED OFF, ● : LED FLASH

Battery Voltage Operation of Charging

●○○○

 3700mV

●●○○

●●●○

●●●●

●●○○

 3700mV  3940mV

●●●○

●●●●

0.5s

 3940mV  4100mV

●●●○

●●●●

 4100mV  4200mV

●●●●

4200mV ●●●●

Battery Vol t age Operation of Discharging

 4200mV  3880mV

 3880mV  3720mV

 3720mV  3500mV

 3500mV  3200mV

 3200mV  2800mV

●●●●

●●●○

●●○○

●○○○

DS9480-04 December 2014 www.richtek.com

RT9480

Thermal Considerations

For continuous operation, do not exceed absolute maximum junction temperature. The maximum power dissipation depends on the thermal resistance of the IC package, PCB layout, rate of surrounding airflow, and difference between junction and a mbient temperature. The maximum power dissipation can be calculated by the following formula :

P where T

the ambient temperature, a nd θ

D(MAX)

= (T

J(MAX)

− TA) / θ

J(MAX)

is the maximum junction temperature, TA is

is the junction to ambient

thermal resistance. For recommended operating condition specifications, the

maximum junction temperature is 125°C. The junction to a mbient thermal resistance, θJA, is layout dependent. For WQFN-24L 4x4 package, the thermal resistance, θJA, is 28°C/W on a standard JEDEC 51-7 f our-layer thermal test board. The maximum power dissipation at TA = 25°C can be calculated by the following formula :

Layout Consideration

The PCB layout is an importa nt step to maintain the high performance of the R T9480.

Both the high current and the fa st switching nodes demand full attention to the PCB layout to save the robustness of the RT9480 through the PCB layout. Improper layout might show the symptoms of poor line or load regulation, ground and output voltage shifts, stability issues, unsatisfying EMI behavior or worsened efficiency.For the best performance of the RT9480, the following PCB layout guidelines must be strictly followed.

 Place the input and output capacitors as close as

possible to the input and output pins respectively for good filtering.

 Care should be taken for a proper thermal layout. Wide

traces, connecting with vi as through the layers, provides a proper thermal path to sink the heat energy created from the device and inductor . Keep the main power traces as wide a nd short as possible. Recommend as below :

= (125°C − 25°C) / (28°C/W) = 3.57W for

D(MAX)

WQF N-24L 4x4 pa ckage The maximum power dissipation depends on the operating

ambient temperature for fixed T

and thermal

J(MAX)

resistance, θJA. The derating curve in Figure 1 allows the designer to see the effect of rising ambient temperature on the maximum power dissipation.

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

Maximum Power Dissipati on ( W ) 1

0.0 0 25 50 75 100 125

Ambient Temperature (°C)

Four-Layer PCB

VBUS trace > 40mil; VBAT trace > 80mil; LXBST trace > 80mil; VMID tra ce > 40mil; USBOUT1 trace > 80mil; USBOUT2 trace > 40mil.

 The switching node area connected to LX and inductor

should be minimized for lower EMI.

 Connect the GND pin, PGNDBST pin a nd Exposed Pad

together to a strong ground plane for maxi mum thermal dissipation and noise protection.

 Directly connect the output cap acitors to the feedback

network of each cha nnel to avoid bouncing caused by parasitic resista nce and inducta nce from the PCB trace.

Figure 1. Derating Curve of Maxi mum Power Dissi pation

DS9480-04 December 2014www.richtek.com

Input capacitors must be placed as close as possible to the Input pins.

GND

VBAT

GND

RT9480

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

LXBST

10 11 12

TORCH

BUTTON

VMID

19202124

TP1

18 17 16 15 14 13

MID

USBOUT1 USBOUT1

SWIN2

USBOUT2

NC TP2

VMID

OUT1

GND

USBOUT1

VMID

USBOUT2

OUT2

GND

Output capacitors must be placed as close as possible to the Output pins.

Connect GND Pin and PGND Pin to Exposed Pad.

VBAT

BAT

NTC

D1 D2 D3 D4

VBAT

LED1 LED2 LED3

LED4

VBUS

1 2

3 4 5 6

GND

PGNDBST

2223

GND

Connect the Exposed Pad to a ground plane.

Figure 2. PCB Layout Guide

DS9480-04 December 2014 www.richtek.com

RT9480

Outline Dimension

SEE DETAIL A

1 2

DETAIL A

Pin #1 ID a nd T ie Bar Mark Option s

Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated.

Dimensions In Millimeters Dimensions In Inches

Symbol

Min Max Min Max

A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010

b 0.180 0.300 0.007 0.012 D 3.950 4.050 0.156 0.159 Option 1 2.400 2.500 0.094 0.098

Option 2 2.650 2.750 0.104 0.108 E 3.950 4.050 0.156 0.159 Option 1 2.400 2.500 0.094 0.098

Option 2 2.650 2.750 0.104 0.108

e 0.500 0.020

L 0.350 0.450 0.014 0.018

W-Type 24L QFN 4x4 Package

Richtek Technology Corporation

14F, No. 8, Tai Yuen 1st Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789

Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.

DS9480-04 December 2014www.richtek.com

Richtek RT9480GQW Schematic [ru]

Specifications and Main Features

Frequently Asked Questions

User Manual