Richtek RT8223LGQW, RT8223LZQW, RT8223MGQW, RT8223MZQW Schematic [ru]

High Efficiency, Main Power Supply Controller
for Notebook Computer

RT8223L/M

General Description

The RT8223L/M is a dual step-down, switch-mode power
supply controller generating logic-supply voltages in
battery-powered systems. It includes two Pulse Width
Modulation (PWM) controllers adjustable from 2V to 5.5V,
and also features fixed 5V/3.3V linear regulators. Each
linear regulator provides up to 100mA output current with
automatic linear regulator bootstrapping to the PWM
outputs. The RT8223L/M includes on-board power up
sequencing, a power good output, internal soft-start, and
soft-discharge output that prevents negative voltage during
shutdown.

The constant on-time PWM sche me can operate without
sense resistors and provide 100ns load tra nsient response
while maintaining nearly constant switching frequency . To
eliminate noise in audio a pplications, a n ultra sonic mode
is included, which maintains the switching frequency
above 25kHz. Moreover, the diode-emulation mode
maximizes efficiency for light load applications. The
RT8223L/M is available in a WQFN-24L 4x4 package.

Ordering Information

RT8223

Features

zz

z Constant On-time Control with 100ns Load Step

zz

Response

zz

z Wide Input Voltage Range : 6V to 25V

zz

zz

z Dual Adjustable Outputs from 2V to 5.5V

zz

zz

z Fixed 3.3V and 5V LDO Output : 100mA

zz

zz

z 2V Reference Voltage

zz

zz

z Frequency Selectable via TONSEL Setting

zz

zz

z 4700ppm/

zz

zz

z Programmable Current Limit Combined with

zz

°°

°C R

°°

Current Sensing

DS(ON)

Enable Control

zz

z Selectable PWM, DEM, or Ultrasonic Mode

zz

zz

z Internal Soft-Start and Soft-Discharge

zz

zz

z High Efficiency up to 97%

zz

zz

z 5mW Quiescent Power Dissipation

zz

zz

z Thermal Shutdown

zz

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

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

Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)

Pin Function
L : Default
M : With ENC

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.

DS8223L/M-04 April 2011 www.richtek.com

1

RT8223L/M

Marking Information

RT8223LGQW RT8223MGQW

EP= : Product Code

EP=YM

DNN

YMDNN : Date Code

EQ=YM

DNN

EQ= : Product Code
YMDNN : Date Code

RT8223LZQW

EP : Product Code

EP YM

YMDNN : Date Code

DNN

Pin Configurations

VOUT1

PGOOD

BOOT1

FB1

REF

FB2

1
2
3
4
5
6

78910 1211

VOUT2

VREG3

GND

BOOT2

ENTRIP1

TONSEL

ENTRIP2

UGATE1

PHASE1

21 20 1924 2223

25

PHASE2

UGATE2

LGATE1

18
17
16
15
14
13

LGATE2

NC
VREG5
VIN
GND
SKIPSEL
EN

RT8223MZQW

(TOP VIEW)

EQ YM

DNN

EQ : Product Code
YMDNN : Date Code

FB1

REF

FB2

1
2
3
4
5
6

ENTRIP1

TONSEL

ENTRIP2

VOUT1

UGATE1

PGOOD

BOOT1

21 20 1924 2223

GND

25

78910 1211

VOUT2

VREG3

BOOT2

UGATE2

PHASE1

PHASE2

LGATE1

18
17
16
15
14
13

LGATE2

ENC
VREG5
VIN
GND
SKIPSEL
EN

WQFN-24L 4x4

RT8223L

WQFN-24L 4x4

RT8223M

DS8223L/M-04 April 2011www.richtek.com

2

Typical Application Circuit

1

C
0

µ

F

1

Q1

BSC119

N03S

1

L

H

µ

8

.

V

T

1

U

O

V

5

C

3

0

µ

F

2

2

1

C

1

.

0

6

5

R

BSC119

4

C

1

8

C

1

2

R
1

5

k

9

µ

1

3

R

F

1

0

k

e

q

u

e

F

r

M

/

E

M

D

P

W

Q3

N03S

V

c

y

n

U

/

l

REF

2V

C
r

t

0

n

t

o

a

n

o

s

ON

OFF

R
3

4

R

R

1

T

O

B

O

C

2

µ

F

1

.

5

1

C

.

F

2

2

µ

0

o

l

r

c

i

RT8223L/M

V

I

N

V

6

2

t

o

V

8

.

9

16

1

0

C

F

µ

1

0

.

0

21

0

22

20
19

24

2

3

4
14
13

VIN

UGATE1

BOOT1

PHASE1
LGATE1

VOUT1

FB1
REF

TONSEL
SKIPSEL
EN

RT8223L

UGATE2

BOOT2

PHASE2

LGATE2

GND

VOUT2

FB2

ENTRIP1

ENTRIP2

GND

VREG5

PGOOD

VREG3

10
9

11
12
15

7
5

1

6
25 (Exposed Pad)

17

23
8

0

1

R

0

0

R

B

O

2

O

T

Q2
BSC119

N03S

C

1

1

µ

1

0

.

F

Q4
BSC119

N03S

R

M

1

I

I

L

k

0

1

5

R

I

L

M

2

I

0

1

5

k

C

9

µ

7

.

4

F

5

R

6

k

0

0

1

P

C

6

1

.

4

µ

7

F

3

1

3

C

µ

1

0

L

2

H

µ

7

.

4

1

1

R

C

1

4

w

l

A

V

.

O

s

y

a

G

O

O

D

I

n

d

3

w

l

V

A

s

y

a

2

1

C

F

0

1

µ

F

C

1

2

2

1

4

R

k

5

6

.

1

5

R
1

k

0

n

i

a

c

r

o

t

O

n

5

V

O

2

U

T

V

3

.

3

7

0

µ

F

C

1

2

2

0

C

F

µ

1

.

0

V

I

N

V

6

2

t

o

V

R

C
µ

l

OFF

8

3

.

9

16

1

0

C

F

µ

1

0

.

R

0

4

21

0

22

R

O

T

1

O

B

2

F

20
19

24

2

5

1

C

.

F

2

2

µ

0

14
13

ON

18

VIN

UGATE1

BOOT1

PHASE1
LGATE1

VOUT1

FB1

3

REF

4

TONSEL
SKIPSEL
EN

ENC

RT8223M

UGATE2

BOOT2

PHASE2

LGATE2

GND

VOUT2

FB2

ENTRIP1

ENTRIP2

GND

VREG5

PGOOD

VREG3

10
9

11
12
15

7
5

1

6
25 (Exposed Pad)

17

23
8

1

C
0

µ

F

1

Q1

BSC119

N03S

1

L

H

µ

8

.

V

T

1

U

O

V

5

C

3

0

µ

F

2

2

1

C

1

.

0

6

5

R

BSC119

N03S

4

C

1

8

C

1

2

R
1

5

k

9

µ

1

3

R

F

1

0

k

e

q

u

n

e

F

r

M

/

E

M

D

P

W

1

0

.

Q3

V

REF

2V

r

n

t

o

C

o

c

y

c

a

n

o

s

i

U

l

/

r

t

ON

OFF

0

1

R

0

0

R

B

O

O

T

2

Q2
BSC119

N03S

C

1

1

µ

1

0

.

F

Q4
BSC119

N03S

R

1

M

I

I

L

k

0

1

5

R

2

M

I

I

L

0

1

5

k

9

C

7

.

4

F

µ

5

6

R

0

0

1

k

P

C

6

1

.

4

7

F

µ

3

1

3

C

µ

1

0

L

2

H

µ

7

.

4

1

1

R

C

1

4

l

A

V

s

y

a

w

O

G

O

O

D

I

n

d

V

A

3

.

s

y

a

w

l

2

1

C

F

0

1

µ

F

C

1

2

2

1

4

R

k

5

6

.

1

5

R
1

k

0

n

c

i

r

o

a

t

O

n

5

V

O

2

U

T

V

3

.

3

7

0

µ

F

C

1

2

2

0

C

F

µ

1

.

0

DS8223L/M-04 April 2011 www.richtek.com

3

RT8223L/M

Functional Pin Description

Pin No . Pin Na me Pin Function

Channel 1 Enable and Current Limit Setting Input. Connect a r esistor to GND to
set the thre shold for channel 1 synchr onous R

1 ENTRIP1

2 FB1

3 REF

4 TONSEL

5 FB2

6 ENTRIP2

7 VOUT2
8 VREG3 3.3V Linear Regulator Output.

9 BOOT2

10 UGATE2

11 PHASE2

12 LGATE2
13 EN

14 SKIPSEL

16 VIN Supply Input for 5V/3.3V LDO and Feed Forward On-Time circuitry.
17 VREG5

NC

18

19 LGATE1

(RT8223L)
ENC
(RT8223M)

current l imit threshold is 1/10th the vo ltage seen at ENTRIP1 over a 0.515V to 3V
range. There is an internal 10μA current source from VREG5 to ENTRIP1. Leave
ENTRIP 1 floati ng or drive it above 4.5V to shut down ch annel 1.

SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from VOUT1
to GND to adjust outpu t from 2V to 5.5V .

2V Refere nce Output. By pass to GND with a minimum 0.22μF capacitor . RE F can
source up to 100μA for external loads. Loading REF degrades FBx and output
accuracy accor ding to the REF load-regulation error.

Frequency Selectable Input for VOUT1/VOUT2 respectively.
400kHz/ 500kHz : Connect to VREG 5 or VREG3
300kHz/ 375kHz : Connect to REF
200kHz/ 250kHz : Connect to GND

SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from VOUT2
to GND to adjust outpu t voltage from 2V to 5.5V.

Channel 2 Enable and Current Limit Setting Input. Connect a r esistor to GND to
set the thre shold for channel 2 synchr onous R
current l imit threshold is 1/10th the volt age seen at ENTRI P2 over a 0.515V to 3V
range. There is an internal 10μA current source from VREG5 to ENTRIP2. Leave
ENTRIP 1 floati ng or drive it above 4.5V to shut down ch annel 2.

Bypass Pin for SMPS2. Connect to the SMPS2 output to bypass efficient power
for VREG3 pin . VOU T2 is also for the SMPS 2 out put soft-di schar ge.

Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor
according to the typical application circuits.
Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and
BOOT2.
Switch Node 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.
Lower Gate Driver Output for SMPS2. LGATE2 swings between GND and
VREG5.
Master Enable Input. The REF/VREG5/VREG3 are enabled if it is within logic
high level and disabled if it is less than the logic low level.
Operati on M ode Sel ect able Input .
Connect to VREG 5 or VREG3 : Ultraso nic Mode
Connect to REF : PWM Mode
Connect to GND : DEM Mode

5V Linear Regulator Output. VREG5 is also the supply voltage for the lower gate
driver and anal og supply voltage for the devi ce.

No Internal Connection.
SMPS Enable Inpu t. Pull up to VRE G 3 or VR EG 5 t o tu rn o n both switc h channels.

Sh or t to GND to shu td o w n the m .
Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and
VREG5.

sense. The G ND − PHASE1

DS(ON)

sense. The G ND − PHASE2

DS(ON)

To be continued

DS8223L/M-04 April 2011www.richtek.com

4

Pin No. P in Name Pin Function

Switch Node for SMPS1. PHASE1 is the internal lower supply rail for the

20 PHASE1

UGATE1 high side gate driver. PHASE1 is also the current-sense input for the
SMPS1.

21 UGATE1

22 BOOT1

Upper Gate Driver Output for SMPS1. UGATE1 swings between P HASE1 and
BOOT1.

Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor
according to the typical application circuits.

23 PGOOD Power Good Output for Channel 1 and Channel 2. (Logical AND).
24 VOUT1

15,25

(Exposed Pad)

GND

Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass effic ient power
for VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge.

Ground for SMPS Controller. The exposed pad must be soldered to a l arge PCB
and connected to GND for maximum power dissipation.

Function Block Diagram

TONSEL SKIPSEL

BOOT1

UGATE1
PHASE1

LGATE1

FB1

ENTRIP1

EN

ENC

VOUT1

VREG5

10µA

VREG5

SW5 Threshold

PWM Buck

Controller

Power-On
Sequence

Clear Fault Latch

SMPS1

SMPS2

PWM Buck

Controller

SW3 Threshold

VREG5

RT8223L/M

BOOT2

UGATE2
PHASE2

VREG5

LGATE2

10µA

VOUT2
FB2

ENTRIP2
PGOOD

GND

Thermal

Shutdown

VREG5

VIN

VREG5

REF

REF

VREG3

VREG3

DS8223L/M-04 April 2011 www.richtek.com

5

RT8223L/M

Absolute Maximum Ratings (Note 1)

z VIN, EN to GND------------------------------------------------------------------------------------------------- −0.3V to 30V
z PHASEx to GND

DC------------------------------------------------------------------------------------------------------------------ −0.3V to 30V
< 20ns ------------------------------------------------------------------------------------------------------------ −8V to 38V

z BOOTx to PHASEx-------------------------------------------------------------------------------------------- −0.3V to 6V
z ENTRIPx, SKIPSEL, TONSEL, PGOOD to GND------------------------------------------------------- −0.3V to 6V
z VREG5, VREG3, FBx , VOUTx, ENC, REF to G ND -------------------------------------------------- −0.3V to 6V
z UGATEx to PHASEx

DC------------------------------------------------------------------------------------------------------------------ −0.3V to (VREG5 + 0.3V)
< 20ns ------------------------------------------------------------------------------------------------------------ −5V to 7.5V

z LGATEx to GND

DC------------------------------------------------------------------------------------------------------------------ −0.3V to (VREG5 + 0.3V)
< 20ns ------------------------------------------------------------------------------------------------------------ −2.5V to 7.5V

z Power Dissipation, P

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

z Package Thermal Re sistance (Note 2)

WQF N-24L 4x4, θJA-------------------------------------------------------------------------------------------- 52°C/W
WQFN-24L 4x4, θJC------------------------------------------------------------------------------------------- 7°C/W

z Lead T e mperature (Soldering, 10 sec.)-------------------------------------------------------------------- 260°C
z Junction T emperature------------------------------------------------------------------------------------------ 15 0°C
z Storage T emperature Range --------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)

HBM (Human Body Mode) ----------------------------------------------------------------------------------- 2kV
MM (Ma chine Mode)------------------------------------------------------------------------------------------- 200V

@ TA = 25°C

D

Recommended Operating Conditions (Note 4)

z Supply Voltage, V

z Junction T emperature Range--------------------------------------------------------------------------------- −40°C to 125°C
z Ambient T emperature Range--------------------------------------------------------------------------------- −40°C to 85°C

-------------------------------------------------------------------------------------------- 6V to 25V

IN

DS8223L/M-04 April 2011www.richtek.com

6

RT8223L/M

Electrical Characteristics

(V

= 12V, V

IN

Parameter Symbol Test Conditions Min Typ Max Unit

Input Supply

VIN Standby Current I
VIN Shutdown Supply

Current
Quiescent Power

Consumption

SMPS Output and FB Voltage

EN

= V

ENC

= 5V, V

VIN_SBY

I

VIN_S HDN

P
+P

ENTRIP1

= V

= 2V, No Load, TA = 25°C, unless otherwise specified)

ENTRIP2

VIN = 6V to 25V, ENTRIPx = GND -- 200 -- μA

= 6V to 25V,

V

VIN

PVCC

IN

ENTRIPx = EN = GND
Bot h SM PS On, V

SK IPSEL = GND, V
(Note 5)

= 2.1V,

FBx

OUT1

= 5V, V

OUT2

= 3.3V

-- 20 40 μA

-- 5 7 mW

DEM Mode 1.975 2 2.025

FBx Voltag e V

Output Voltage Adjust
Range

V

Discharge

OUTx

Current

On-Time

On-Time Pulse W idth tON

Minimum Off-Time t
Ultrasonic Mode

Frequency

Soft-Start

Sof t -S t art Ti me t

Current Sense

ENTRIPx Source
Current
ENTRIPx Current
Temperature
Coefficient
ENTR IPx Adjust ment
Range
Current Limit
Threshold
Zero-Current
Threshold

FBx

PWM Mode (Note 6) -- 2 --

V

Ultrasonic Mode -- 2.032 --

V

SMPS1, SMPS2 2 -- 5.5 V

OUTx

V

OUTx

= 0.5V, V

TONSEL =
GND

TONSEL = REF

TONSEL =
VREG5

V

OFF

= 1.9V 200 300 400 ns

FBx

ENTRIPx

= 0V 10 45 -- mA

V

= 5.05V (200kHz) 1895 2105 2315

OUT1

V

= 3.33V (250kHz) 999 1110 1221

OUT2

= 5.05V (300kHz) 1227 1403 1579

V

OUT1

V

= 3.33V (375kHz) 647 740 833

OUT2

= 5.05V (400kHz) 895 1052 1209

V

OUT1

V

= 3.33V (500kHz) 475 555 635

OUT2

ns

SKIPSEL = VREG5 or VREG3 22 33 -- kHz

Internal Soft-Start -- 2 -- ms

SSx

I

ENTRIPx

TC

V
GND − PHASEx, V

V

IENTRIPx

ENTRIPx

= 0.9V 9.4 10 10.6 μA

In Comparison with 25°C (Note 6) -- 4700 -- ppm/°C

ENTRIPx

= I

ENTRIPx

x R

ENTRIPx

ENTRIPx

-- -- 3 V

= 2V 180 200 220 mV

GND − PHASEx in DEM -- 3 -- mV

To be continued

DS8223L/M-04 April 2011 www.richtek.com

7

RT8223L/M

Parameter Symbol Test Conditions Min Typ Max Unit

Internal Regulator and Reference

VREG5 Output Voltage V

VREG3 Output Voltage V

VREG5 Output Current I

VREG5

VREG3

VREG5

V

OUT1

V

OUT1

I

VREG5

V

OUT1

I

VREG5

V

OUT2

V

OUT2

I

VREG3

V

OUT2

I

VREG3

V

VREG5

= GND, I

< 100m A 4 .8 5 5.2

VREG5

= GN D , 6 .5V < VIN < 25V,

< 100mA

= GN D , 5 .5V < VIN < 25V,

< 50mA

= GND, I
= GN D , 6 .5V < VIN < 25V,

< 100mA

= GN D , 5 .5V < VIN < 25V,

< 50mA

= 4.5V, V

< 100mA 3.2 3.33 3.46

VREG3

= GND 100 175 250 mA

OUT1

4.75 5 5.25

4.75 5 5.25

3.13 3.33 3.5

3.13 3.33 3.5

V

V

VREG3 Output Current I
VREG5 Switch-over

Threshold to V

OUT1

VREG3 Switch-over
Threshold to V

OUT2

VREGx Switch-over
Eq uiv al ent R esi sta nc e

REF Output Voltage V
REF Load Regulation 0 < I

V

VREG3

V

V

SW5

V

SW3

VREGx to V

R

SWx

No External Load 1.98 2 2.02 V

REF

V
V
V

= 3V, V

VREG3

Rising Edge 4.6 4.75 4.9 V

OUT1

Falling Edge 4.3 4.4 4.5 V

OUT1

Rising Edge 2.975 3.125 3.25 V

OUT2

Falling Edge 2.775 2.875 2.975 V

OUT2

OUTx

< 100μA -- 10 -- mV

LOAD

= GND 100 175 250 mA

OUT2

, 10mA -- 1.5 3 Ω

REF Sink Current REF in Regulation 5 -- -- μA

UVLO

VREG5 Under Voltage
Lo c kout Threshold

VREG3 Under Voltage
Lo c kout Threshold

SMPSx off -- 2.5 -- V

Rising Edge -- 4.2 4.45
Falling Edge 3.7 3.9 4.1

Power Good

PGOOD Detect, FBx falling Edge 82 85 88

PGOOD Threshold

PGOOD Propagation
Delay

Falling Edge, 50mV Overdrive -- 10 -- μs

Hysteresis, Rising Edge with SS Delay
Time

-- 6 --

PGOOD Leakage Current High State, Forced to 5.5V -- -- 1 μA
PGOOD Output Low

Voltage

I

= 4mA -- -- 0.3 V

SINK

Fault Detection

Over Voltage Protection
Trip Threshold

Over Voltage Protection
Propagation Delay

Under Voltage Protection
Trip Threshold

V

FB_OVP

OVP Detect, FBx Rising Edge 109 112 116 %

FBx = 2.35V -- 5 -- μs

V

FB_UVP

UVP Detect, FBx Falling Edge 49 52 56 %

To be continued

DS8223L/M-04 April 2011www.richtek.com

8

V

%