Richtek RT8205AGQW, RT8205BGQW, RT8205CGQW Schematic

®

RT8205A/B/C

High Efficiency, Main Power Supply Controllers for Notebook Computers

General Description

The RT8205A/B/C dual step-down, switch-mode power-

supply controller generates logic-supply voltages in

battery-powered systems. The RT8205A/B/C includes two

pulse-width modulation (PWM) controllers fixed at 5V/

3.3V or adjustable from 2V to 5.5V. An alternative LGATE1

output LG1_CP can be used for external charge pump

(RT8205B). And an optional external charge pump can be

monitored through SECFB (RT8205C). This device also

features 2 linear regulators providing fixed 5V and 3.3V

outputs. The linear regulator each provides up to 70mA

output current with automatic linear-regulator bootstrapping

to the PWM outputs. The RT8205A/B/C includes on-board

power-up sequencing, the power-good output, internal soft-

start, and internal soft-discharge output that prevents

negative voltages on shutdown.

A constant on-time PWM control scheme operates without

sense resistor and provides 100ns response to load

transients while maintaining a relatively constant switching

frequency. The unique ultrasonic mode maintains the

switching frequency above 25kHz, which eliminates noise

in audio applications. Other features include diode-

emulation mode (DEM), which maximizes efficiency in

light-load applications, and fixed-frequency PWM mode,

which reduces RF interference in sensitive application

Features

zz

z Wide Input Voltage Range 6V to 25V

zz

z Dual Fixed 5V/3.3V Outputs or Adjustable from 2V

zz

to 5.5V, 1.5% Accuracy .

zz

z Alternative LGA TE1 Output (LG1_CP) acts a s Clock

zz

for Charge Pump (RT8205B)

zz

z Secondary Feedback Input Maintains Charge Pump

zz

V oltage (RT8205C)

zz

z Fixed 3.3V and 5V LDO Output : 70mA

zz

z 2V Reference Voltage ±1% : 50

zz

z Constant ON-Time Control with 100ns Load Step

zz

μμ

μA

μμ

Response

zz

z Frequency Selectable via TONSEL Setting

zz

z R

zz

Current Sensing and Progra mmable Current

DS(ON)

Limit combined with Enable Control

zz

z Selectable PWM, DEM, or Ultrasonic Mode

zz

z Internal Soft-Start and Soft-Discharge

zz

z High Efficiency up to 97%

zz

z 5mW Quiescent Power Dissipation

zz

z Thermal Shutdown

zz

z RoHS Compliant and Halogen Free

zz

Applications

z Notebook and Sub-Notebook Computers

z 3-Cell and 4-Cell Li+ Battery-Powered Devices

Ordering Information

RT8205

Package Type QW : WQFN-24L 4x4 (W-Type)

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

Pin Function A : Default B : With LG1_CP C : With SECFB

DS8205A/B/C-06 July 2012 www.richtek.com

©

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.

1

RT8205A/B/C

Marking Information

RT8205AGQW

CJ= : Product Code

CJ=YM

DNN

Pin Configurations

ENTRIP1

FB1

REF

TONSEL

FB2

ENTRIP2

YMDNN : Date Code

UGATE1

VOUT1

PGOOD

BOOT1

1

2

3

4

5

6

21 20 1924 2223

GND

25

78910 1211

PHASE1

LGATE1

18

17

16

15

14

13

NC VREG5 VIN GND SKIPSEL EN

RT8205BGQW

CK=YM

DNN

(TOP VIEW)

FB1

REF

FB2

1

2

3

4

5

6

78910 1211

ENTRIP1

TONSEL

ENTRIP2

CK= : Product Code

YMDNN : Date Code

UGATE1

BOOT1

21 20 1924 2223

PHASE1

25

LGATE1

18

17

16

15

14

13

VOUT1

PGOOD

GND

LG1_CP VREG5 VIN PGND SKIPSEL EN

RT8205CGQW

CL=YM

DNN

VOUT1

FB1

REF

FB2

1

2

3

4

5

6

78910 1211

ENTRIP1

TONSEL

ENTRIP2

CL= : Product Code

YMDNN : Date Code

UGATE1

BOOT1

21 20 1924 2223

PHASE1

25

LGATE1

18

17

16

15

14

13

SECFB VREG5 VIN PGND SKIPSEL EN

PGOOD

GND

VOUT2

VREG3

BOOT2

LGATE2

PHASE2

UGATE2

RT8205A

WQFN-24L 4x4

Typical Application Circuit

For Fixed Voltage Regulator

1

C

F

u

0

1

Q1

BSC119

N03S

2

1

L

H

6

.

u

V

1

T

U

O

V

5

3

C

F

u

0

2

8

q

r

e

/

D

Q3

BSC119

N03S

c

y

n

e

u

/

M

U

E

5

R

4

C

F

M

W

P

OFF

C

F

0

.

u

1

2

.

0

l

n

t

o

C

r

o

i

o

c

n

s

l

t

r

a

ON

VOUT2

VREG3

BOOT2

LGATE2

PHASE2

UGATE2

RT8205B

WQFN-24L 4x4

7

R

.

9

3

16

6

C

F

.

0

1

u

4

R

0

21

0

3

R

22

20

19

24

1

C

u

F

2

3

4

14

13

2

5

VIN

UGATE1

BOOT1

PHASE1

LGATE1

VOUT1 REF

TONSEL

SKIPSEL

EN

FB1

FB2

RT8205A

UGATE2

BOOT2

PHASE2

LGATE2

VOUT2

VREG5

PGOOD

VREG3

ENTRIP1

ENTRIP2

GND

10

9

11

12

7

17

23

8

1

6

15, Exposed Pad (25)

R

9

0

R

8

0

C

5

4

u

7

F

.

1

2

C 4

u

7

F

.

Q2 BSC119

C

7 1

.

u

0

F

Q4 BSC119

R

6

1

0

R

1

5

R

1

5

VOUT2

RT8205C

WQFN-24L 4x4

N03S

5

V

k

0

P

G

O

3

.

V

1 0

k

2

0

k

VREG3

C

1

0

4

R

1

C

w

l

A

O

A

BOOT2

9

F

u

L

2

7

u

.

0

1

a

y

s

n

I

D

w

a

l

UGATE2

H

O

i

d

s

y

LGATE2

PHASE2

C

8

1

0

n

c

o

a

r

t

O

n

V

I

N

u

F

V

2

O

U

T

3

.

V

C

1

3

2

0

u

F

©

DS8205A/B/C-06 July 2012www.richtek.com

2

RT8205A/B/C

V

I

7

1

C

F

u

0

1

Q1

BSC119

N03S

L

1

H

u

8

.

V

1

U

T

O

V

5

3

C

F

u

0

2

6

5

R

BSC119

N03S

4

C

0

Q3

R

.

3

9

16

0

1

C

F

u

.

0

1

4

R

0

21

0

3

R

2

C

F

u

1

.

22

20

19

24

5

C

1

D

6

C

D

1

0

.

C

1

0

.

2

u

F

4

D

2

T

A

B

8

u

F

CP

1

0

.

F

u

7

C

3

D

0

1

.

u

F

4

5

ON

18

3

1

C

5

F

u

2

.

2

0

13

OFF

t

r

l

o

n

c

o

C

y

n

r

e

u

e

q

F

i

o

c

n

/

l

U

t

r

s

/

M

D

W

P

a

M

E

4

14

VIN

UGATE1

BOOT1

PHASE1

LGATE1

VOUT1

LG1_CP

REF

EN

TONSEL

SKIPSEL

RT8205B

UGATE2

BOOT2

PHASE2

LGATE2

VOUT2

VREG5

PGOOD

VREG3

ENTRIP1

ENTRIP2

PGND

FB1

FB2

GND

10

9

11

12

7

17

23

8

1

6

15

2

5

Exposed Pad (25)

R

9

0

R

8

0

Q2

BSC119

N03S

C

7

0

.

1

u

F

Q4 BSC119

N03S

C

9

4

7

.

6

C

1

4

7

.

R

u

F

u

6

1

0

k

R

1

5

0

k

R

2

1

5

0

k

C

1

3

C

1

0

u

L

7

.

4

R

1

0

C

4

1

5

A

V

l

w

a

y

P

G

O

D

3

.

V

w

A

l

1

F

1

0

u

2

u

H

s

O

n

I

d

i

c

a

o

t

r

a

O

n

y

s

N

2 F

V

O

U

T

2

3

.

V

C

1

7

2

0

2

u

F

V

N

8

1

C

F

u

0

1

Q1

BSC119

N03S

1

L

H

6

u

.

V

1

T

U

O

3

C

u

F

0

2

8

5

R

BSC119

N03S

4

C

1

D

6

C

0

.

C

0

.

D

1

2

F

u

3

D

4

D

4

5

2

A

T

B

8 u

F

CP

Q3

0

5

C

u

1

F

.

7

C

1

F

.

u

6

R

2

0

k

8

1

C

ON

R

.

9

3

16

0

1

C

.

F

1

u

0

4

R

0

21

0

3

R

2

C

F

u

.

1

22

20

19

24

3

5

C

1

F

u

2

0

.

2

5

18

7

R

3

9

k

13

VIN

UGATE1

BOOT1

PHASE1

LGATE1

VOUT1

REF

FB1

FB2

SECFB

EN

RT8205C

UGATE2

BOOT2

PHASE2

LGATE2

VOUT2

VREG5

PGOOD

VREG3

ENTRIP1

ENTRIP2

TONSEL

SKIPSEL

PGND

GND

10

9

11

12

7

17

23

8

1

6

4

14

15

Exposed Pad (25)

1

R

0

Q2

BSC119

R

9

0

C

0

N03S

1

.

u

F

Q4 BSC119

N03S

C

9

4

7

.

C

1

6

4

7

.

q

F

e

r

M

W

P

u

F

e

/DE

R

6

1

0

k

0

R

1

0

5

k

R

2

1

0

5

k

n

y

c

o

C

r

o

t

n

l

o

s

/

l

M

U

t

r

a

C

1

3

C

1

0

u

L

4

7

.

1

R

1

C

4

1

5

A

V

w

l

a

ys

P

G

O

D

A

3

.

V

w

l

i

c

n

1

F

1

0

u

2

u

H

O

n

c

i

I

a

d

o

t

r

a

s

O

y

n

I

2 F

V

O

U

T

2

3

.

V

1

7

C

2

0

u

F

OFF

©

DS8205A/B/C-06 July 2012 www.richtek.com

3

RT8205A/B/C

For Adjustable Voltage Regulator

C

1

u

F

0

1

Q1

BSC119

N03S

L

1

H

8

.

u

V

O

U

T

1

V

5

3

C

u

2

0

F

2

5

1

C

1

.

0

6

r

M

BSC119

N03S

u

e

q

e

E

D

/

Q3

y

C

c

o

n

r

t

l

a

U

M

/

R

5

C

4

1

C

F

u

1

R

k

1

5

2

R

1

k

1

0

F

W

P

OFF

V

I

R

7

3

9

.

16

C

6

1

.

u

F

0

4

R

C

2 F

.

u

1

0

21

0

3

22

20

19

24

VIN

UGATE1

BOOT1

PHASE1

LGATE1

VOUT1

RT8205A

UGATE2

BOOT2

PHASE2

LGATE2

VOUT2

FB2

ENTRIP1

ENTRIP2

2

FB1

3

4

14

13

REF

TONSEL

SKIPSEL

EN

1

C

F

2

u

0

2

.

n

o

r

t

l

c

i

n

o

s

ON

GND

VREG5

PGOOD

VREG3

R

9

10

9

11

0

8

0

R

7

C

0

u

.

1

12

7

5

1

R

k

5

1

6

0

2

R

5

k

0

1

15, Exposed Pad (25)

17

5

C 4

.

7

F

u

23

8

1

C

2

4

.

7

F

u

F

Q2 BSC119

N03S

Q4

BSC119

N03S

R

6

0

1

k

9

C

1

4

R

1

C

V

5

l

w

A

O

G

P

O

.

3

V

A

C

u

0

L .

7

0

1

a

D

l

w

8

F

u

1

0

2

u

H

0

R

.

6

R 1

0

n

O

s

y

I

n

d

i

c

o

a

t

r

a

s

y

n

O

N

F

V

U

O

2

T

3

.

3

C 2

1

3

5

k

1

4

k

V

3

1

0

2

u

F

1

7

C

6

C

1

F

.

u

0

1

V

I

R

C

1

F

0

u

1

Q1

BSC119

N03S

L

1

H

8

u

.

V

T

1

O

U

V

5

3

C

F

u

2

0

2

6

R

5

BSC119

C

N03S

4

Q3

1

0

.

7

.

9

3

16

0

C

1

F

u

.

1

0

R

0

4

21

0

R

3

22

C

2

F

u

20

19

24

C

1

8

1

R

1

5

k

1

9

C

1

u

F

1

.

0

2

R

1

0

k

C

6

D

0

.

1

C

0

.

1

2

u

F

D

4

B

8 u

F

CP

P

C

5

D

1

0

.

u

1

F

C

7

D

3

0

.

1

u

F

5

4

T

2

A

ON

OFF

o

r

t

C

o

u

F

e

q

r

D

E

M

/

W

n

e

n

y

c

i

n

a

o

s

r

t

l

U

/

M

2

18

3

C

1

5

F

u

0

2

.

13

l

4

14

VIN

UGATE1

BOOT1

PHASE1

LGATE1

VOUT1

FB1

LG1_CP

REF

EN

TONSEL

SKIPSEL

RT8205B

UGATE2

BOOT2

PHASE2

LGATE2

VOUT2

FB2

ENTRIP1

ENTRIP2

GND

VREG5

PGOOD

VREG3

PGND

10

9

11

12

7

5

1

6

Exposed Pad (25)

17

23

8

15

9

R

0

8

R

0

Q2

BSC119

N03S

7

C

.

0

1

F

u

Q4

BSC119

N03S

1

R

k

0

5

1

2

R

1

0

5

k

C

9

.

7

4

u

1

C

6

4

.

7

u

6

R

F

0

k

1

F

C

3

1

u

0

1

L

4

.

7

1

R

0

C

1

4

V

5

l

a

A

w

P

O

G

D

V

.

3

l

A

w

1

C

F

1

u

0

2

u

H

R

.

6

R

0

1

y

n

s

O

I

d

n

i

c

t

r

o

a

y

a

s

n

O

N

2 F

V

U

2

O

T

3

.

V

1

C

7

2

0

F

u

1

2

C

1

3

5

k

1

4

k

0

2

C

F

u

1

0

.

©

DS8205A/B/C-06 July 2012www.richtek.com

4

RT8205A/B/C

V

N

8

1

C

F

u

0

1

Q1

BSC119

N03S

1

L

H

6

u

.

V

1

T

U

O

3

C

u

F

0

2

8

1

C

R 1

C

9

1 1

0

.

R

F

u

1

8

5

R

BSC119

N03S

4

C

2

1

k

5

3

1

k

0

C

6

0

.

u

1

F

8

C

0

.

1

F

u

CP

D

2

4

D

B

OFF

1

D

5

2

T

A

ON

0

Q3

5

C

0

.

u

1

F

7

C

3

0

1

.

u

F

6

R

4

2

0

1

C

R

.

9

3

16

0

1

C

.

F

1

u

0

4

R

0

21

0

3

R

2

C

F

u

.

1

k

8

22

20

19

24

2

3

5

C

1

F

u

2

0

.

2

18

7

R 3

9

k

13

VIN

UGATE1

BOOT1

PHASE1

LGATE1

VOUT1

FB1

REF

SECFB

EN

RT8205C

UGATE2

BOOT2

PHASE2

LGATE2

VOUT2

FB2

ENTRIP1

ENTRIP2

GND

VREG5

PGOOD

VREG3

TONSEL

SKIPSEL

PGND

10

9

11

12

7

5

1

6

Exposed Pad (25)

17

23

8

4

14

15

1

R

0

R

9

0

C

9

u

4

7

.

C

1

6

u

4

7

.

Q2 BSC119

N03S

C

1

.

0

u

F

Q4 BSC119

N03S

1

R

1

0

5

k

R

2

1

0

5

k

R

6

F

1

0

k

F

C

1

3

1

0

4

R

1

C

5

V

w

l

A

O

P

G

O

3

.

V

A

F

r

e

u

q

e

/

M

D

W

P

C

F

u

1

0

L

2

7

.

u

H

1

4

1

R

.

6

R

0

1

s

a

y

O

n

i

I

d

D

c

a

o

t

r

w

a

l

s

y

O

n

c

C

o

y

n

r

t

o

/

l

U

t

s

r

a

M

E

I

1

2

u

F

V

O

U

T

2

3

.

C 2

1

4

k

5

1

5

k

l

i

o

c

n

V

1

7

2

0

u

F

1

2

C

2

C

0

F

u

1

.

0

©

DS8205A/B/C-06 July 2012 www.richtek.com

5

RT8205A/B/C

Function Block Diagram

TONSEL SKIPSEL

BOOT1

UGATE1

PHASE1

LGATE1

PGND

VOUT1

FB1

ENTRIP1

EN

VREG5

VIN

VREG5

SMPS1

PWM Buck

Controller

Power-On Sequence

Clear Fault Latch

SW Threshold

Thermal

Shutdown

VREG5

Function Block Diagram

SMPS2

PWM Buck

Controller

SW Threshold

REF

VREG3

VREG5

BOOT2

UGATE2

PHASE2

LGATE2

VOUT2

FB2 ENTRIP2

PGOOD

GND

VREG3

VOUT

REF

FB

PGOOD

+

1.1 x V

0.7 x V

0.9 x V

+

-

REF

On-Time

Compute

VINTONSEL

T

Comp

+

Over-Voltage

+

-

+

Under-Voltage

+

ON

Q

1-Shot

TRIG

Fault

Latch

Blanking

Time

R

25kHz

Detector

TRIG

SS

Time

Detector

Zero

SKIPSEL

T

1-Shot

Q

OFF

Current

+

-

+

-

Limit

VREG5

+

-

UGATE

LGATE

ENTRIP

PHASE

PWM Controller (One Side)

6

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Functional Pin Description

RT8205A/B/C

ENTRIP1 (Pin 1)

Channel 1 enable and Current Limit setting Input. Connect

resistor to GND to set the threshold for channel 1

synchronous R

limit threshold is 1/10th the voltage seen at ENTRIP1 over

a 0.5V to 2V range. There is an internal 10uA current source

from VREG5 to ENTRIP1. The logic current limit threshold

is default to 200mV value if ENTRIP1 is higher than

VREG5-1V.

FB1 (Pin 2)

SMPS1 Feedback Input. Connect FB1 to VREG5 or GND

for fixed 5V operation. Or connect FB1 to a resistive voltage-

divider from VOUT1 to GND to adjust output from 2V to

5.5V.

REF (Pin 3)

2V Reference Output. Bypass to GND with a 0.22uF

capacitor. REF can source up to 50uA for external loads.

Loading REF degrades FBx and output accuracy according

to the REF load-regulation error.

sense. The GND-PHASE1 current-

DS(ON)

from VREG5 to ENTRIP2. The logic current limit threshold

is default to 200mV value if ENTRIP2 is higher than

VREG5-1V.

VOUT2 (Pin 7)

SMPS2 Output Voltage-Sense Input. Connect to the

SMPS2 output. VOUT2 is an input to the on-time one-

shot circuit. It also serves as the SMPS2 feedback input

in fixed-voltage mode.

VREG3 (Pin 8)

3.3V Linear Regulator Output.

BOOT2 (Pin 9)

Boost Flying Capacitor Connection for SMPS2. Connect

to an external capacitor according to the typical application

circuits.

UGA TE2 (Pin 10)

High-Side MOSFET Floating Gate-Driver Output for

SMPS2. UGATE2 swings between PHASE2 and BOOT2.

TONSEL (Pin 4)

Frequency Selectable Input for VOUT1/VOUT2

respectively.

400kHz/500kHz : Connect to VREG5 or VREG3

300kHz/375kHz : Connect to REF

200kHz/250kHz : Connect to GND

FB2 (Pin 5)

SMPS2 Feedback Input. Connect FB2 to VREG5 or GND

for fixed 3.3V operation. Or connect FB2 to a resistive

voltage-divider from VOUT2 to GND to adjust output from

2V to 5.5V.

ENTRIP2 (Pin 6)

Channel 2 enable and Current Limit setting Input. Connect

resistor to GND to set the threshold for channel 2

synchronous R

limit threshold is 1/10th the voltage seen at ENTRIP2 over

a 0.5V to 2V range. There is an internal 10uA current source

sense. The GND-PHASE2 current-

DS(ON)

PHASE2 (Pin 11)

Inductor Connection for SMPS2. PHASE2 is the internal

lower supply rail for the UGATE2 high-side gate driver.

PHASE2 is also the current-sense input for the SMPS2.

LGA TE2 (Pin 12)

SMPS2 Synchronous-Rectifier Gate-Drive Output.

LGATE2 swings between GND and VREG5.

EN (Pin 13)

Master Enable Input. The REF/VREG5/VREG3 are

enabled if it is within logic high level and disable if it is

less than the logic low level.

SKIPSEL (Pin 14)

Operation Mode Selectable Input.

Ultrasonic Mode : Connect to VREG5 or VREG3

Diode Emulation Mode : Connect to REF

PWM Mode : Connect to GND

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7

RT8205A/B/C

GND [Pin 15 (RT8205A), Exposed Pad (25)]

Analog Ground for SMPS controller. The exposed pad

must be soldered to a large PCB and connected to GND

for maximum power dissipation.

PGND (Pin 15) (RT8205B/C)

Power Ground for SMPS controller. Connect PGND

externally to the underside of the exposed pad.

VIN (Pin 16)

High Voltage Power Supply Input for 5V/3.3V LDO and

Feed-forward ON-Time circuitry.

VREG5 (Pin 17)

5V Linear Regulator Output.VREG5 is also the supply

voltage for the low-side MOSFET driver and analog supply

voltage for the device.

NC (Pin 18) (RT8205A)

No Internal Connection.

UGA TE1 (Pin 21)

High-Side MOSFET Floating Gate-Driver Output for

SMPS1. UGATE1 swings between PHASE1 and BOOT1.

BOOT1 (Pin 22)

Boost Flying Capacitor Connection for SMPS1. Connect

to an external capacitor according to the typical application

circuits.

PGOOD (Pin 23)

Power Good Output for channel 1 and channel 2. (Logical

AND)

VOUT1 (Pin 24)

SMPS1 Output Voltage-Sense Input. Connect to the

SMPS1 output. VOUT1 is an input to the on-time one-

shot circuit. It also serves as the SMPS1 feedback input

in fixed-voltage mode.

LG1_CP (Pin 18) (RT8205B)

Alternative LGATE1 Output for 14V charge pump.

SECFB (Pin 18) (RT8205C)

The SECFB is used to monitor the optional external 14V

charge pump. Connect a resistive voltage-divider from 14V

charge pump output to GND to detect the output. If SECFB

drops below the threshold voltage, LGATE1 turns on for

300ns (typ.). This will refresh the external charge pump

driven by LGATE1 without over-discharging the output

voltage.

LGA TE1 (Pin 19)

SMPS1 Synchronous-Rectifier Gate-Drive Output.

LGATE1 swings between GND and VREG5.

PHASE1 (Pin 20)

Inductor Connection for SMPS1. PHASE1 is the internal

lower supply rail for the UGATE1 high-side gate driver.

PHASE1 is also the current-sense input for the SMPS1.

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DS8205A/B/C-06 July 2012www.richtek.com

RT8205A/B/C

Absolute Maximum Ratings (Note 1)

z VIN, EN to GND ----------------------------------------------------------------------------------------------- −0.3V to 28V

z PHASEx to GND

DC---------------------------------------------------------------------------------------------------------------- −0.3V to 28V

< 20ns ---------------------------------------------------------------------------------------------------------- −8V

z BOOTx to PHASEx ------------------------------------------------------------------------------------------ −0.3V to 6V

z ENTRIPx, SKIPSEL, TONSEL, PGOOD, to GND ---------------------------------------------------- −0.3V to 6V

z VREG5, VREG3, FBx, VOUTx, SECFB, REF to GND --------------------------------------------- −0.3V to (VREG5 + 0.3V)

z UGATEx to PHASEx

DC---------------------------------------------------------------------------------------------------------------- −0.3V to (VREG5 + 0.3V)

< 20ns ---------------------------------------------------------------------------------------------------------- −5V

z LGATEx to GND

DC---------------------------------------------------------------------------------------------------------------- −0.3V to (VREG5 + 0.3V)

< 20ns ---------------------------------------------------------------------------------------------------------- −2.5V

z Power Dissipation, P

WQFN-24L 4x4 ----------------------------------------------------------------------------------------------- 1.923W

z Package Thermal Resistance (Note 2)

WQFN-24L 4x4, θJA------------------------------------------------------------------------------------------ 52°C/W

WQFN-24L 4x4, θJC----------------------------------------------------------------------------------------- 7°C/W

z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------ 260°C

z Junction Temperature ---------------------------------------------------------------------------------------- 150°C

z Storage Temperature Range ------------------------------------------------------------------------------- −65°C to 150°C

z ESD Susceptibility (Note 3)

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

@ TA = 25°C

D

Recommended Operating Conditions (Note 4)

z Input Voltage, VIN -------------------------------------------------------------------------------------------- 6V to 25V

z Junction Temperature Range ------------------------------------------------------------------------------- −40°C to 125°C

z Ambient Temperature Range ------------------------------------------------------------------------------- −40°C to 85°C

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To be continued

Richtek RT8205AGQW, RT8205BGQW, RT8205CGQW Schematic [ru]