Richtek RT8223AGQW, RT8223AZQW, RT8223BGQW, RT8223BZQW Schematic [ru]
High Efficiency, Main Power Supply Controller
for Notebook Computers
RT8223A/B
General Description
The RT8223A/B dual step-down, switch-mode powersupply controller generates logic-supply voltages in
battery-powered systems. The RT8223A/B includes two
pulse-width modulation (PWM) controllers fixed at 5V/
3.3V or adjustable from 2V to 5.5V. 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 RT8223A/B includes on-board
power-up sequencing, the power good output, internal softstart, and internal soft-discharge output that prevents
negative voltages on shutdown.
A consta nt on-time PWM control scheme operates without
sense resistor and provides 100ns response to load
transients while maintaining a relatively consta nt switching
frequency. The unique ultrasonic mode maintains the
switching frequency above 25kHz, which eliminates noise
in audio applications. Other features include diodeemulation mode (DEM), which maximizes efficiency in
light-load a pplications, a nd fixed-frequency PWM mode,
which reduces RF interference in sensitive a pplication
Features
zz
z Wide Input Voltage Range 6V to 25V
zz
zz
z Dual Fixed 5V/3.3V Outputs or Adjustable from 2V
zz
to 5.5V, 1.5% Accuracy
zz
z Fixed 3.3V and 5V LDO Output : 70mA
zz
zz
z 2V Reference Voltage ±1% : 50
zz
zz
z Constant ON-Time Control with 100ns Load Step
zz
μμ
μA
μμ
Response
zz
z Frequency Selectable via TONSEL Setting
zz
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
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
Marking Information
Ordering Information
RT8223
Package Type
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
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
A : Default
B : 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.
DS8223A/B-04 April 2011 www.richtek.com
1
RT8223A/B
Pin Configurations
VOUT1
PGOOD
BOOT1
FB1
REF
FB2
1
2
3
4
5
6
78910 1211
GND
ENTRIP1
TONSEL
ENTRIP2
(TOP VIEW)
UGATE1
LGATE1
PHASE1
21 20 1924 2223
18
NC
17
VREG5
16
VIN
15
14
13
PGND
SKIPSEL
EN
25
ENTRIP1
TONSEL
ENTRIP2
FB1
REF
FB2
1
2
3
4
5
6
78910 1211
VOUT1
PGOOD
BOOT1
21 20 1924 2223
GND
UGATE1
LGATE1
PHASE1
18
ENC
17
VREG5
16
VIN
15
14
13
PGND
SKIPSEL
EN
25
VOUT2
VREG3
BOOT2
LGATE2
PHASE2
UGATE2
RT8223A
WQFN-24L 4x4
Typical Application Circuit
For Fixed V oltage Regulator
C
1
µ
F
0
1
Q1
BSC119
N03S
1
L
H
8
6
µ
V
O
U
T
1
V
5
3
C
F
µ
2
0
2
.
R
5
BSC119
C
N03S
4
u
e
e
q
r
F
E
M
D
/
M
W
P
0
Q3
n
r
t
y
C
n
o
c
o
n
s
r
t
a
U
l
/
ON
OFF
R
3
4
R
R
3
C
2
F
µ
.
1
C
1
1
F
2
2
.
µ
0
l
o
c
i
VOUT2
VREG3
BOOT2
LGATE2
PHASE2
UGATE2
RT8223B
WQFN-24L 4x4
V
I
7
.
9
16
C
6
F
1
µ
.
0
0
21
0
22
20
19
24
3
4
14
13
2
5
VIN
UGATE1
BOOT1
PHASE1
LGATE1
VOUT1
REF
TONSEL
SKIPSEL
EN
FB1
FB2
RT8223A
UGATE2
BOOT2
PHASE2
LGATE2
PGND
VOUT2
VREG5
PGOOD
VREG3
ENTRIP1
ENTRIP2
GND
R
9
10
9
11
12
15
7
17
23
8
1
6
Exposed Pad (25)
0
0
8
R
C
5
4
.
µ
7
C
1
2
4
.
7
µ
Q2
BSC119
N03S
7
C
.
0
µ
1
F
Q4
BSC119
N03S
R
6
F
F
0
0
1
k
1
R
5
1
k
0
2
R
1
5
0
k
9
C
1
4
R
C
5
V
l
A
w
O
O
G
P
3
.
V
3
A
C
µ
0
L
.
1
0
1
a
D
l
w
8
F
1
µ
0
2
7
µ
H
0
y
n
s
O
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i
c
a
o
t
r
a
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s
O
n
N
F
V
U
O
2
T
.
3
3
C
2
V
3
1
0
2
µ
F
DS8223A/B-04 April 2011www.richtek.com
2
RT8223A/B
V
I
R
C
µ
OFF
OFF
y
t
l
7
9
3
.
16
0
C
1
1
0
.
µ
F
R
0
4
R
2
F
ON
ON
o
r
t
C
o
n
s
o
a
n
i
r
21
0
3
22
20
19
24
18
3
5
C
1
F
.
2
0
2
µ
13
l
c
4
14
C
1
F
0
u
1
Q1
BSC119
N03S
L
1
8
µ
H
6
V
1
O
U
T
5
V
3
C
F
2
2
0
µ
.
R
5
BSC119
C
N03S
4
P
W
1
0
.
Q3
n
c
e
F
r
e
q
u
U
/
M
/
M
D
E
VIN
UGATE1
BOOT1
PHASE1
LGATE1
VOUT1
ENC
REF
EN
TONSEL
SKIPSEL
RT8223B
UGATE2
BOOT2
PHASE2
LGATE2
PGND
VOUT2
VREG5
PGOOD
VREG3
ENTRIP1
ENTRIP2
FB1
FB2
GND
10
9
11
12
15
7
17
23
8
1
6
2
5
Exposed Pad (25)
9
R
0
8
R
0
C
9
.
µ
4
7
1
C
6
.
4
µ
7
Q2
BSC119
N03S
7
C
.
0
1
F
µ
Q4
BSC119
N03S
6
R
F
1
k
0
0
F
1
R
0
5
1
k
2
R
5
1
0
k
C
3
1
1
µ
0
L
.
4
7
1
R
0
C
1
5
V
A
l
a
w
P
D
O
O
G
3
A
.
V
3
l
w
1
C
F
1
0
2
µ
H
4
y
s
On
n
c
I
i
d
r
a
o
t
a
y
s
On
N
2
F
µ
V
U
T
2
O
.
V
3
3
1
C
7
2
µ
0
F
2
DS8223A/B-04 April 2011 www.richtek.com
3
RT8223A/B
For Adjustable V oltage Regulator
C
1
µ
F
0
1
Q1
BSC119
N03S
1
L
H
6
8
.
V
O
T
U
1
V
5
3
C
F
µ
2
0
2
1
C
1
5
C
F
1
.
µ
0
µ
e
r
M
/
BSC119
N03S
q
e
n
u
E
M
D
Q3
y
C
c
o
r
t
s
l
a
U
/
R
5
C
4
4
1
1
R
k
5
1
2
R
1
k
0
1
F
W
P
OFF
n
o
0
t
n
ON
V
I
R
7
.
3
9
16
C
6
1
.
F
µ
0
0
4
R
R
C
2
.
F
µ
1
21
0
3
22
20
19
24
VIN
UGATE1
BOOT1
PHASE1
LGATE1
VOUT1
RT8223A
UGATE2
BOOT2
PHASE2
LGATE2
PGND
VOUT2
FB2
ENTRIP1
ENTRIP2
2
FB1
3
4
14
13
REF
TONSEL
SKIPSEL
EN
1
1
C
2
F
µ
.
0
2
r
l
o
c
i
GND
VREG5
PGOOD
VREG3
R
9
10
9
0
8
0
R
11
12
15
7
5
1
R
k
5
1
1
6
0
2
R
k
0
1
5
Exposed Pad (25)
17
5
C
4
.
7
µ
23
8
2
1
C
4
.
7
µ
Q2
BSC119
N03S
7
C
µ
.
1
0
F
Q4
BSC119
N03S
R
6
F
1
0
0
k
F
9
C
1
4
R
1
C
V
5
l
w
A
O
G
P
O
.
3
3
V
A
C
µ
0
L
.
8
F
µ
1
0
2
7
H
µ
0
1
0
R
1
.
6
R
1
1
0
a
s
y
n
O
D
I
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N
F
V
U
O
2
T
3
.
V
3
C
3
1
0
2
µ
F
2
1
7
C
3
5
k
4
k
6
C
1
F
1
.
µ
0
V
I
R
C
1
F
0
µ
1
Q1
BSC119
N03S
L
1
8
H
µ
6
V
T
1
O
U
5
V
3
C
F
2
0
µ
2
.
R
5
BSC119
C
N03S
4
Q3
1
0
.
7
9
.
3
16
0
C
1
1
F
µ
.
0
R
0
4
21
0
R
3
22
C
2
µ
F
20
19
24
8
C
1
R
1
1
5
k
1
C
1
9
R
1
1
µ
.
F
0
2
0
k
1
ON
OFF
ON
2
18
3
C
1
5
F
µ
2
2
0
.
13
OFF
o
l
r
t
y
C
o
n
c
u
e
n
q
F
e
r
o
c
n
s
i
/
r
t
U
a
l
D
/
E
M
P
M
W
4
14
VIN
UGATE1
BOOT1
PHASE1
LGATE1
VOUT1
FB1
ENC
REF
EN
TONSEL
SKIPSEL
RT8223B
UGATE2
BOOT2
PHASE2
LGATE2
PGND
VOUT2
FB2
ENTRIP1
ENTRIP2
GND
VREG5
PGOOD
VREG3
10
9
11
12
15
7
5
1
6
Exposed Pad (25)
17
23
8
9
R
0
0
8
R
Q2
BSC119
N03S
7
C
.
µ
F
0
1
Q4
BSC119
N03S
1
R
1
0
5
k
2
R
0
5
1
k
C
9
.
4
7
µ
1
C
6
.
4
7
µ
6
R
F
0
1
0
k
F
C
3
1
0
1
µ
L
4
7
.
1
R
0
C
1
4
V
5
l
a
A
w
P
O
O
G
D
.
3
V
3
l
A
w
1
C
F
1
µ
0
2
µ
H
R
1
6
.
R
1
1
0
y
n
s
O
I
d
n
i
c
t
a
r
o
y
a
n
s
O
N
2
F
V
O
U
2
T
.
3
3
V
7
1
C
2
F
2
µ
0
1
2
C
3
5
k
4
k
0
2
C
F
µ
.
1
0
DS8223A/B-04 April 2011www.richtek.com
4
Function Block Diagram
RT8223A/B
TONSEL SKIPSEL
BOOT1
UGATE1
PHASE1
LGATE1
PGND
VOUT1
FB1
ENTRIP1
EN
ENC
VREG5
VIN
VREG5
PWM Buck
Power-On
Sequence
Clear Fault Latch
SW Threshold
VREG5
SMPS1
Controller
Thermal
Shutdown
SMPS2
PWM Buck
Controller
SW Threshold
REF
REF
Function Block Di agra m
VREG3
VREG5
BOOT2
UGATE2
PHASE2
LGATE2
VOUT2
FB2
ENTRIP2
PGOOD
GND
VREG3
VOUT
REF
FB
PGOOD
+
1.1 x V
0.6 x V
0.9 x V
+
-
REF
REF
REF
On-Time
Compute
VINTONSEL
+
Over-Voltage
+
-
+
Under-Voltage
+
T
ON
Comp
Q
1-Shot
TRIG
Fault
Latch
Blanking
Time
R
25kHz
Detector
TRIG
SS
Time
Detector
Zero
T
1-Shot
Q
S
OFF
Current
+
-
+
+
-
Limit
VREG5
+
-
UGATE
LGATE
ENTRIP
PHASE
SKIPSEL
PWM Controller (One Side)
DS8223A/B-04 April 2011 www.richtek.com
5
RT8223A/B
Functional Pin Description
ENTRIP1 (Pin 1)
Channel 1 enable a nd Current Limit setting Input. Connect
a 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 10μA current
source from VREG5 to ENTRIP1.
FB1 (Pin 2)
SMPS1 Feedback Input. Connect FB1 to VREG5 or GND
for fixed 5V operation. Or connect FB1 to a resistive voltagedivider from VOUT1 to GND to adjust output from 2V to
5.5V.
REF (Pin 3)
2V Reference Output. Bypass to GND with a 0.22μF
cap acitor . REF ca n source up to 50μA f or external loads.
Loading REF degrades FBx and output a ccuracy a ccording
to the REF load regulation error.
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 G ND to adjust output from
2V to 5.5V.
ENTRIP2 (Pin 6)
Channel 2 enable a nd Current Limit setting Input. Connect
a 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 10μA current
source from VREG5 to ENTRIP2.
sense. The GND − PHASE1 current-
DS(ON)
sense. The GND − PHASE2 current
DS(ON)
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 Cap acitor Conne ction for SMPS2. Connect
to an external ca pa citor according to the typical a pplication
circuits.
UGA TE2 (Pin 10)
High-Side MOSFET Floating Gate Driver Output for
SMPS2. UGA TE2 swings between PHASE2 and BOOT2.
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.
LGA TE2 swings between PGND a nd VREG5.
EN (Pin 13)
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.
SKIPSEL (Pin 14)
Operation Mode Selectable Input.
Ultrasonic Mode : Connect to VREG5 or VREG3
Diode Emulation Mode : Connect to GN D
PWM Mode : Connect to REF
GND [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.
DS8223A/B-04 April 2011www.richtek.com
6
RT8223A/B
PGND (Pin 15)
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-Ti me circuitry .
VREG5 (Pin 17)
5V Linear Regulator Output.VREG5 is also the supply
voltage for the low-side MOSFET driver a nd analog supply
voltage for the device.
NC (Pin 18) (RT8223A)
No Internal Connection.
ENC (Pin 18) (RT8223B)
SMPSx Enable Input. Pull up to VREG3 or VREG5 to
turn on both switcher channels. Short to GND to shutdown
them.
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.
LGA TE1 (Pin 19)
SMPS1 Synchronous Rectifier Gate Drive Output. LGA TE1
swings between PGND a nd 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.
UGA TE1 (Pin 21)
High-Side MOSFET Floating Gate Driver Output for
SMPS1. UGA TE1 swings between PHASE1 and BOOT1.
BOOT1 (Pin 22)
Boost Flying Cap acitor Conne ction for SMPS1. Connect
to an external ca pa citor according to the typical a pplication
circuits.
PGOOD (Pin 23)
Power Good Output f or channel 1 a nd channel 2. (Logical
AND)
DS8223A/B-04 April 2011 www.richtek.com
7
RT8223A/B
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 GND ---------------------------------------------------------------- –0.3V to 6V
z UGATEx to PHASEx
DC------------------------------------------------------------------------------------------------------------------------------- –0.3V to 6V
< 20ns ------------------------------------------------------------------------------------------------------------------------- −5V to 7.5V
z LGATEx to GND
DC------------------------------------------------------------------------------------------------------------------------------- –0.3V to 6V
< 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.)--------------------------------------------------------------------------------- 2 60 °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 (Ma chine Mode)-------------------------------------------------------------------------------------------------------- 200V
@ TA = 25°C
D
Recommended Operating Conditions (Note 4)
z Input Voltage, V
z Junction T emperature Range---------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient T emperature Range---------------------------------------------------------------------------------------------- −40°C to 100°C
8
------------------------------------------------------------------------------------------------------------ 6V to 25V
IN
DS8223A/B-04 April 2011www.richtek.com
RT8223A/B
Electrical Characteristics
(VIN = 12V, EN = ENC = 5V, ENTRIP1 = ENTRIP2 = 2V, No Load on VREG5, VREG3, VOUT1, VOUT2 and REF , T
unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Input Supply
VIN Standby Supply
Current
VIN Shutdown Supply
Current
Quiescent Power
Cons umption
I
VIN_SBY
I
VIN_S HDH
SMPS Output and FB Voltage
VOUT1 Output Voltage in
Fixed Mode
VOUT2 Output Voltage in
Fixed Mode
FBx in Output Adjustable
Mode
Output Voltage
Adjustment Range
FBx A djustab le -mode
Threshold Voltage
Line Regulation V
V
OUT1
V
OUT2
FBx V
V
OUT x
Fixed or Adj-Mode comparator threshold 0.2 0.4 0.55 V
LOAD
LINE
On Time
SMPS1, SMPS2 2 -- 5.5 V
Either SMPS, VIN = 6V to 25V -- 0.005 -- %/V
= 6V to 2 5 V, Both SMP S Off,
V
IN
EN = 5V, ENC = GND
-- 200 -- μA
VIN = 6V to 25V, ENTRIPx = EN = GND -- 20 40 μA
Bot h SMPSs O n, FBx = SKIPSEL = R E F
V
= 5.3V, V
OUT1
V
= 6V to 25V, FB1= REF or 5V,
IN
= 3.5V (Note 5)
OUT2
SK IPSEL = REF
= 6V to 25V, FB2 = REF or 5V,
V
IN
SK IPSEL = REF
= 6V to 25V 1.975 2 2.025 V
IN
-- 5 7 mW
4.975 5.05 5.125 V
3.285 3.33 3.375 V
Either SMPS, SKIPSEL = REF, 0 to 5A -- −0.1 -Either SMPS, SKIPSEL = VREG5, 0 to 5A -- −1.7 -- DC Load Regulation V
Either SMPS, SKIPSEL = GND, 0 to 5A -- −1.5 --
= 25°C,
A
%
On-Time Pulse Width t
Mini mum Off-T i me t
Ultrasonic Mode
Frequency
Soft Start
Sof t-Start Ti me t
Current Sense
Current Limit Threshold
(Default)
ENTRIPx Source Current I
ENTRIPx Current
Temperature Coefficient
ENTRIPx Adjustment
Range
V
= 5.05V 1895 2105 2315
TONSEL = GND
TONSEL = REF
UGATEx
TONSEL = VREG5
200 300 400 ns
LGATEx
OUT1
= 3.33V 999 1110 1221
V
OUT2
V
= 5.05V 1227 1403 1579
OUT1
= 3.33V 647 740 833
V
OUT2
V
= 5.05V 895 1052 1209
OUT1
V
= 3.33V 475 555 635
OUT2
ns
SKIPSEL = VREG5 or VREG3 20 28 -- kHz
Zero to Full Limit from ENTR IPx Enable -- 2 -- ms
SSx
V
ENTRIPx
TC
IENTRIPx
V
ENTRIPx
V
ENTRIPx
-- 1600 -- PPM/°C
ENTRIPx
= VREG 5, GN D−PHASEx 180 200 220 mV
= 0.9V 9.4 10 10.6 μA
= I
ENTRIPx
x R
ENTRIPx
0.5 -- 2 V
To be continued
DS8223A/B-04 April 2011 www.richtek.com
9
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