Richtek RT8223PZQW Schematic [ru]

High Efficiency, Main Power Supply Controller
for Notebook Computer

RT8223P

General Description

The RT8223P 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 RT8223P 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 a nd provide 100ns load tran sient 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
RT8223P is available in a WQF N-24L 4x4 pa ck age.

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

Ordering Information

RT8223P

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

Lead Plating System
Z : ECO (Ecological Element with
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.

Marking Information

20 : Product Code

20 YM

DNN

YMDNN : Date Code

Pin Configurations

(TOP VIEW)

VOUT1

PGOOD

BOOT1

FB1

REF

FB2

1
2
3

GND

4
5
6

78910 1211

VOUT2

VREG3

BOOT2

WQFN-24L 4x4

ENTRIP1

TONSEL

ENTRIP2

UGATE1

LGATE1

PHASE1

21 20 1924 2223

18

ENC

17

VREG5

16

VIN

15

25

UGATE2

GND

14

SKIPSEL

13

EN

LGATE2

PHASE2

DS8223P-01 June 2011 www.richtek.com

1

RT8223P

Typical Application Circuit

1

C

0

µ

F

1

Q1

BSC119

N03S

L

1
µ

H

.

8

V

1

T

U

O

5

V

C

2

µ

2

0

1

C

.

1

0

6

F

M

r

q

e
/

D

Q3

BSC119

N03S

V

c

u

n

y

e

E

M

l

/

U

OFF

REF

2V

C

t

r

o

a

3
F

1

C

8

9

µ

F

5

R

4

C

1

2

R

5

1

k

1

3

R

0

1

k

W

P

R

R

2

C

.

0

1

µ

F

1

C

.

0

2

µ

2

t

r

l

n

o

o

i

s

n

c

ON

ON

OFF

V

I

N

V

6

V

2

o

5

t

8

R

.

9

3

16

0

1

C

.

0

1

µ

F

4

0

21

0

22

O

1

B

T

O

20
19

24

5
F

14
13

18

VIN

UGATE1

BOOT1

PHASE1
LGATE1

VOUT1

2

FB1

3

REF

4

TONSEL
SKIPSEL
EN

ENC

RT8223P

UGATE2

BOOT2

PHASE2
LGATE2

GND

VOUT2

FB2

ENTRIP1

ENTRIP2

GND

VREG5

PGOOD

VREG3

R

1

0

0

10

0

9

R

2

T

B

O

O

11
12
15

7
5

R

1

L

M

I

I

1

5

0

1

6
25 (Exposed Pad)

17

23
8

k

R

M

2

I

L

I

5

0

1

k

C

9

µ

.

7

4

6

C

1

7

µ

.

4

Q2
BSC119

N03S

C

1

1

0

.

1

F

µ

Q4
BSC119

N03S

5

R

6

F

0

0

1

k

P
3

F

3

C

1

1

0

F

µ

2

L

µ

7

4

.

H

R

1

1

C

1

4

R

.

6

R

0

1

V

G

3

.

n

O

y

w

s

a

A

l

O

O

n

I

D

o

r

t

c

d

i

a

V

A

l

w

a

O

s

y

n

C

1

2

0

µ

1

F

V

U

T

O

2

3

3

.

V

C

1

7

2

F

µ

2

0

1

2

C

1

4

k

5

1

5

k

0

2

C

F

µ

.

1

0

Functional Pin Description

P in No. Pin Name Pin Function

Chan nel 1 Ena ble an d Curre nt Li mi t Sett ing Inp ut. Co nnec t a r esisto r to GND to
set the threshold for channel 1 synchronous R

1 ENTRIP1

2 FB1

3 REF

4 TONSEL

5 FB2

6 ENTRIP2

7 VOUT2
8 VREG3 3.3V Linear Regulator Output.

current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.515V to 3V
range. There is an internal 10μA c urren t sou r ce from V REG5 to ENT R IP1. Lea ve
ENTRIP1 floating or short ENTRIP1 to GND to shut down channel 1.

SMPS 1 Feedbac k Input. Connect FB1 t o a re sisti ve v olt a ge div ide r fr om VOU T1
to GND to adjust output from 2V to 5.5V.

2V Reference Output. Bypass to GND with a minimum 0.22μF c apac i to r. RE F can
so urce up to 10 0μA for exte rnal loa ds. Loadin g REF d egrades FBx and output
accuracy according to the REF load-regulation error .

Frequency Selectable Input for VOUT1/VOUT2 respectively.
400kHz/500kHz : Connect to VREG5 or VREG3
300kHz/375kHz : Connect to REF
200kHz/250kHz : Connect to GND

SMPS 2 Feedbac k Input. Connect FB2 t o a re sisti ve v olt a ge div ide r fr om VOU T2
to GND to adjust output voltage from 2V to 5.5V.

Chan nel 2 Ena ble an d Curre nt Li mi t Sett ing Inp ut. Co nnec t a r esisto r to GND to
set the threshold for channel 2 synchronous R
current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.515V to 3V
range. There is an internal 10μA curr ent sourc e from VREG5 to ENT RIP2. Lea ve
ENTRIP2 floating or short ENTRIP2 to GND to shut down channel 2.

Byp ass Pi n for SMP S2. Co nn ect to t h e SM P S2 o ut p ut to bypas s effici ent pow er
for VREG3 pin. VOUT2 is also for the SMPS2 output soft-discharge.

sense. The GND − PHASE1

DS(ON)

sense. The GND − PHASE2

DS(ON)

T o be continued

DS8223P-01 June 2011www.richtek.com

2

Pin No. Pin Name Pin Function

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

18 ENC
19 LGATE1

20 PHASE1

21 UGATE1

22 BOOT1
23 PGOOD Power Good Output for Channel 1 and Channel 2. (Logical AND).
24 VOUT1

15, 25

(Exposed Pad)

GND

Boos t Flyin g C ap aci t or C on nec tio n f o r SM PS 2. Conne ct to an ex te r nal cap ac itor
ac co rding to the typic al ap p lic ati on cir c ui ts.
Upper Gate Dri ver Output for S MPS 2. U GAT E2 swings between PHASE2 and
BOOT2.
Switch Node for SMPS2. PHASE2 is the internal lower supply rail for the
UGAT E2 hi gh s ide gate driv er. PH ASE2 is also the cur rent -sense inp ut for the
SMPS2.
Lower Gate Driver Output for SMPS2. LGATE2 swings between GND and
VREG5.
Ma ster E nabl e In put. The REF/V REG 5/VR EG3 ar e e na bled if it is wit hin l ogic
high level and disabled if it is less than the logic low level.
Operation Mode Selectable Input.
Conn ec t to VREG5 or VRE G3 : Ultras on ic Mod e
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 analog supply voltage for the device.
SMPS Enable Input. Pull up to VREG3 or VREG5 to turn on both switch channels.
Short to GND to shutdown them.
Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and
VREG5.
Switch Node for SMPS1. PHASE1 is the internal lower supply rail for the
UGAT E1 hi gh s ide gate driv er. PH ASE1 is also the cur rent -sense inp ut for the
SMPS1.

Upper Gate Dri ver Output for S MPS 1. U GAT E1 swings between PHASE1 and
BOOT1.

Boos t Flyin g C ap aci t or C on nec tio n f o r SM PS 1. Conne ct to an ex te r nal cap ac itor
ac co rding to the typic al ap p lic ati on cir c ui ts.

Byp ass Pin f or SMPS 1. Co nn ect t o th e SM P S1 outp ut to by pas s effici ent pow er
for VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge.

Gr ound for SMP S C ont rol l er. The exp os ed pad mu st be s olde r ed to a lar ge PCB
and con nected to GND for maxi mum power dissipati on.

RT8223P

DS8223P-01 June 2011 www.richtek.com

3

RT8223P

Function Block Diagram

BOOT1

UGATE1
PHASE1

LGATE1

FB1

ENTRIP1

EN

ENC

VOUT1

VREG5

VREG5

10µA

SW5 Threshold

TONSEL SKIPSEL

SMPS1

PWM Buck

Controller

Power-On
Sequence

Clear Fault Latch

SMPS2

PWM Buck

Controller

SW3 Threshold

VREG5

BOOT2

UGATE2
PHASE2

VREG5

LGATE2

10µA

VOUT2
FB2

ENTRIP2
PGOOD

GND

VREG5

VIN

VREG5

Thermal

Shutdown

REF

REF

VREG3

VREG3

DS8223P-01 June 2011www.richtek.com

4

RT8223P

Absolute Maximum Ratings (Note 1)

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

D C---------------------------------------------------------------------------------------------------------------- −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 GND -------------------------------------------------- −0.3V to 6V
z UGA TEx to PHASEx

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

z LGA TEx to GND

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

z Power Dissipation, P

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

z Package Thermal Resistance (Note 2)

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

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

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

@ TA = 25°C

D

Recommended Operating Conditions (Note 4)

z Supply V oltage, 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

DS8223P-01 June 2011 www.richtek.com

5

RT8223P

Electrical Characteristics

(V

= 12V, V

IN

Parameter Symbol Test Conditions Min Typ Max Unit

Input Supply

VIN Standby Current I
VIN Shutdown Supply

Current
Quiesce nt Power

Consumption

SMPS Output and FB Voltage

EN

= V

ENC

= 5V, V

VIN_SBY

I

VIN_SHDN

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
Both SMPS On, V

SKIPSEL = GND, V
(Note 5)

= 2. 1V,

FBx

OUT1

= 5V, V

OUT2

= 3. 3 V

-- 20 40 μA

-- 5 7 mW

DEM Mod e 1 .97 5 2 2.02 5

FBx Voltage V

Out p ut Vol ta ge Ad ju st
Range

V

Discharge

OUTx

Current

V

V

On-Time

On-Time Pulse Width tON

Minimum Off-Time t
Ultrasonic Mode

Frequency

SKIPSEL = VREG5 or VREG3 22 33 -- kHz

Soft-Start

Soft-S t art Time t

Cur r ent S ens e

ENTRIPx Source
Current

I

ENTRIPx Current
Temperature

TC
Coefficient
ENT RIP x Ad ju stme n t
Range
Current Limit
Threshold
Zero-Current
Threshold

V

GND − PHASEx, V

GND − PHASEx in DEM -- 3 -- mV

FBx

PWM Mode (Note 6) -- 2 --

V

Ultrasonic Mode -- 2.032 --

SMPS1, SMPS2 2 -- 5.5 V

OUTx

= 0.5V, V

OUTx

ENTRIPx

TONSEL = GND

TONSEL = REF

TONSEL = REG5

V

OFF

Internal Soft-Start -- 2 -- ms

SSx

ENTRIPx

V

IENTRIPx

= 1.9V 200 300 4 00 ns

FBx

ENTRIPx

= 0.9V 9.4 10 10.6 μA

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

ENTRIPx

= I

ENTRIPx

= 0V 10 45 -- mA

V

= 5.05 V (200k H z) 189 5 2105 2 315

OUT1

= 3.33V (250kH z ) 9 99 1110 1221

V

OUT2

V

= 5.05 V (300k H z) 122 7 1403 1 579

OUT1

= 3.33 V (375k H z) 647 740 8 33

V

OUT2

V

= 5.05 V (400k H z) 895 1052 1 209

OUT1

V

= 3.33 V (500k H z) 475 555 6 35

OUT2

x R

ENTRIPx

ENTRIPx

0.515 -- 3 V

= 2V 180 200 220 mV

ns

T o be continued

DS8223P-01 June 2011www.richtek.com

6

Parameter Symbol Test Conditions Min Typ Max Unit

Internal Regulator and Reference

VREG5 Outpu t Volta g e V

VREG3 Outpu t Volta g e V

VREG5 Outpu t Cu rrent 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

< 100mA 4.8 5 5.2

VREG5

= GND, 6.5V < VIN < 25V,

< 100mA

= GND, 5.5V < VIN < 25V,

< 50mA

= GND, I
= GND, 6.5V < VIN < 25V,

< 100mA

= GND, 5.5V < VIN < 25V,

< 50mA

= 4.5V , V

< 100mA 3.2 3.33 3.46

VREG3

= GND 100 175 250 mA

OUT1

RT8223P

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 Outpu t Cu rrent I
VR EG5 Switc h-o v er

Threshold to V

OUT1

VR EG3 Switc h-o v er
Threshold to V

OUT2

VREGx Switch-over
Equi vale nt Resistance

REF Output Voltage V
REF Load Reg ulation 0 < I

V

VREG3

V

V

SW5

V
V

V

SW3

VREGx to V

R

SWx

No External Load 1.98 2 2.02 V

REF

V

= 3V, V

VREG3

Rising Edge 4.6 4.75 4.9

OUT1

Falling Edge 4.3 4. 4 4.5

OUT1

Rising Edge 2.975 3.125 3.25

OUT2

Falling Edge 2.775 2.875 2.975

OUT2

OUTx

< 100μA -- 10 -- mV

LOAD

= GND 100 175 250 mA

OUT2

, 10mA -- 1.5 3 Ω

V

V

REF Sink Current REF in Reg ulation 5 -- -- μA

UVLO

VREG5 Under Volt age
Lockout Threshol d

VREG3 Under Volt age
Lockout Threshol d

SMPSx off -- 2.5 -- V

Rising Edge -- 4.2 4.45

V

Falli ng Edge 3.7 3. 9 4.1

Powe r Go od

PGOO D Detect, FBx falling Edge 82 85 88

PGOOD Threshold

PGOO D Prop agat ion
Delay

Hy s tere s is , Rising Edge with SS De lay
Time

-- 6 --

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

%

PGOO D Lea kage Current High State, Forc ed to 5.5V -- -- 1 μA
PGOOD Output Low

Voltage

I

= 4mA -- -- 0.3 V

SINK

Fault Detection

Over Voltage Protection
Tr ip Thresh old

Over Voltage Protection
Propagation Delay

Unde r Vol tage Protection
Tr ip Thresh old

V

FB_OVP

FBx = 2.35V -- 5 -- μs

V

FB_UVP

OVP Detect, FBx Rising Edg e 109 112 1 16 %

U VP Detect , FBx Fall ing Edge 49 52 56 %

T o be continued

DS8223P-01 June 2011 www.richtek.com

7

RT8223P

Parameter Symbol Test Conditions Min Typ Max Unit

UVP Shutdown Blanking Time t

SHDN_UVP

Thermal Shutdown

Thermal Shutdown T

SHDN

Thermal Shutdown Hysteresis -- 10 -- °C

Logic Input

SKIPSEL Input Volt age

ENTR IPx

ENTRIPx Low Level Threshold

EN Threshold
Voltage

Logic-High VIH 2.4 -- -­Logic-Low V

-- -- 0.4

IL

EN Voltage VEN Floating, Default Enable 2.4 3. 3 4.2 V
EN Current IEN

ENC Threshold
Voltage

Logic-High V
Logic-Low V

IH_ENC

IL_ENC

From ENTRIPx Enable -- 5 -- ms

-- 150 -- °C

Low Level (DEM Mode) -- -- 0.8
REF Level ( PW M Mode) 1. 8 -- 2.3
High Level (Ultrasonic Mode) 2.7 -- -­Low Level (SMPS Off) -- -- 0.25
On Level (SMPS On) 0.515 -- 3 ENTRIPx Input Voltage V
High Level (SMPS Off) 4.5 -- -­Rising Edge -- 0.4 0.515
Falling Edge 0.25 0.36 --

V

= 0.2V , Source 1.5 3 5

EN

= 5V, Sink -- 3 8

V

EN

2 -- --

-- -- 0.6

V

V

V

V

μA

V

Input Leakage Current

Inter nal BOOT Switch

Internal Boost Switch
On-Resistance

Power MOSFET Dri vers

UGATE x On-Resistance

LGATE x On-Resistance

Dead Time

V

/ V

OUT1

V

/ V

OUT1

/ V

V

OUT1

V

TONSEL

V

= 0V or 5V −1 -- 1

ENC

VREG5 to BOOTx, 10mA -- 40 80 Ω

UGA TEx, High State,
BOOTx to PHASEx F orced to 5V
UGATEx, Low St at e,
BOOTx to PHASEx F orced to 5V

LGATEx , High St ate -- 4 8

= 200kHz/250kHz -- -- 0.8

OUT2

= 300kHz/375kHz 1.8 -- 2.3 TONSEL Sett i ng Voltage

OUT2

= 400kHz/500kHz 2.7 -- --

OUT2

, V

SKIPSEL

= 0V or 5V −1 -- 1

-- 4 8

-- 1.5 4

V

μA

Ω

Ω

LGATEx , Low State -- 1. 5 4
LGA TEx Ri sing -- 30 --

ns

UGATE x Rising -- 40 --

DS8223P-01 June 2011www.richtek.com

8