http://www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf


Richtek
Richtek

RT8223M Datasheet

(RT8223L/M) Main Power Supply Controller


RT8223M Datasheet Preview


RT8223L/M
High Efficiency, Main Power Supply Controller
for Notebook Computer
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 scheme can operate without
sense resistors and provide 100ns load transient response
while maintaining nearly constant switching frequency. To
eliminate noise in audio applications, an ultrasonic 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
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.
Features
z Constant On-time Control with 100ns Load Step
Response
z Wide Input Voltage Range : 6V to 25V
z Dual Adjustable Outputs from 2V to 5.5V
z Fixed 3.3V and 5V LDO Output : 100mA
z 2V Reference Voltage
z Frequency Selectable via TONSEL Setting
z 4700ppm/°C RDS(ON) Current Sensing
z Programmable Current Limit Combined with
Enable Control
z Selectable PWM, DEM, or Ultrasonic Mode
z Internal Soft-Start and Soft-Discharge
z High Efficiency up to 97%
z 5mW Quiescent Power Dissipation
z Thermal Shutdown
z RoHS Compliant and Halogen Free
Applications
http://www.DataSheet4U.net/
z Notebook and Sub-Notebook Computers
z 3-Cell and 4-Cell Li+ Battery-Powered Devices
DS8223L/M-04 April 2011
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
Page 1

RT8223L/M
Marking Information
RT8223LGQW
EP= : Product Code
EP=YM
DNN
YMDNN : Date Code
RT8223LZQW
EP : Product Code
EP YM
DNN
YMDNN : Date Code
RT8223MGQW
EQ= : Product Code
EQ=YM
DNN
YMDNN : Date Code
RT8223MZQW
EQ YM
DNN
EQ : Product Code
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
ENTRIP1 1
18 NC
FB1 2
17 VREG5
REF 3
TONSEL 4
GND
16 VIN
15 GND
FB2 5
25 14 SKIPSEL
ENTRIP2 6
13 EN
7 8 9 10 11 12
http://www.DataSheet4U.net/
24 23 22 21 20 19
ENTRIP1 1
18 ENC
FB1 2
17 VREG5
REF 3
TONSEL 4
GND
16 VIN
15 GND
FB2 5
25 14 SKIPSEL
ENTRIP2 6
13 EN
7 8 9 10 11 12
WQFN-24L 4x4
RT8223L
WQFN-24L 4x4
RT8223M
www.richtek.com
2
DS8223L/M-04 April 2011
datasheet pdf - http://www.DataSheet4U.net/
Page 2

Typical Application Circuit
RT8223L/M
VOUT1
5V
C3
220µF
C18
C19
0.1µF
C1
10µF
R8
3.9
C10
0.1µF
L1
6.8µH
Q1
BSC119
N03S
R4 0
RBOOT1 0
C2
0.1µF
R5
Q3
BSC119
C4 N03S
R12
15k
R13 VREF
10k
2V C15
0.22µF
Frequency Control
PWM/DEM/Ultrasonic
ON
OFF
16 VIN
RT8223L
UGATE2 10
R10
0
21 UGATE1
BOOT2 9
0
RBOOT2
PHASE2 11
C11
0.1µF
22 BOOT1
LGATE2 12
20 PHASE1
19 LGATE1
24 VOUT1
2 FB1
3 REF
GND 15
VOUT2 7
FB2 5
ENTRIP1 1
ENTRIP2 6
RILIM1
150k
RILIM2
150k
25 (Exposed Pad)
GND
Q2
BSC119
N03S
Q4
BSC119
N03S
C13
10µF
VIN
6V to 25V
C12
10µF
L2
4.7µH
R11
C14
VOUT2
3.3V
C17
220µF
R14 C21
6.5k
C20
R15 0.1µF
10k
4 TONSEL
14 SKIPSEL
13 EN
VREG5 17
PGOOD 23
VREG3 8
C9
4.7µF
C16
4.7µF
R6
100k
5V Always On
PGOOD Indicator
3.3V Always On
VOUT1
5V
C3
220µF
C18
C19
0.1µF
http://www.DataSheet4U.net/
C1
10µF
R8
3.9
C10
0.1µF
L1
6.8µH
Q1
BSC119
N03S
R4 0
0
C2 RBOOT1
0.1µF
R5
Q3
BSC119
C4 N03S
R12
15k
R13 VREF
10k
2V C15
0.22µF
Frequency Control
PWM/DEM/Ultrasonic
ON
OFF ON
OFF
16 VIN
RT8223M
UGATE2 10
R10
0
21 UGATE1
BOOT2 9
0
RBOOT2
PHASE2 11
C11
0.1µF
22 BOOT1
LGATE2 12
20 PHASE1
19 LGATE1
24 VOUT1
2 FB1
3 REF
GND 15
VOUT2 7
FB2 5
ENTRIP1 1
ENTRIP2 6
RILIM1
150k
RILIM2
150k
GND 25 (Exposed Pad)
Q2
BSC119
N03S
Q4
BSC119
N03S
C13
10µF
VIN
6V to 25V
C12
10µF
L2
4.7µH
R11
C14
VOUT2
3.3V
C17
220µF
R14 C21
6.5k
C20
R15 0.1µF
10k
4 TONSEL
14 SKIPSEL
13 EN
18 ENC
VREG5 17
PGOOD 23
VREG3 8
C9
4.7µF
C16
4.7µF
R6
100k
5V Always On
PGOOD Indicator
3.3V Always On
DS8223L/M-04 April 2011
www.richtek.com
3
datasheet pdf - http://www.DataSheet4U.net/
Page 3

RT8223L/M
Functional Pin Description
Pin No.
1
2
Pin Name
ENTRIP1
FB1
Pin Function
Channel 1 Enable and Current Limit Setting Input. Connect a resistor to GND to
set the threshold for channel 1 synchronous RDS(ON) sense. The GND PHASE1
current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.515V to 3V
range. There is an internal 10μA current source from VREG5 to ENTRIP1. Leave
ENTRIP1 floating or drive it above 4.5V to shut down channel 1.
SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from VOUT1
to GND to adjust output from 2V to 5.5V.
3 REF
2V Reference Output. Bypass to GND with a minimum 0.22μF capacitor. REF can
source up to 100μA for external loads. Loading REF degrades FBx and output
accuracy according to the REF load-regulation error.
Frequency Selectable Input for VOUT1/VOUT2 respectively.
4
TONSEL
400kHz/500kHz : Connect to VREG5 or VREG3
300kHz/375kHz : Connect to REF
200kHz/250kHz : Connect to GND
5 FB2
SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from VOUT2
to GND to adjust output voltage from 2V to 5.5V.
Channel 2 Enable and Current Limit Setting Input. Connect a resistor to GND to
set the threshold for channel 2 synchronous RDS(ON) sense. The GND PHASE2
6
ENTRIP2
current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.515V to 3V
range. There is an internal 10μA current source from VREG5 to ENTRIP2. Leave
ENTRIP1 floating or drive it above 4.5V to shut down channel 2.
7
VOUT2
Bypass Pin for SMPS2. Connect to the SMPS2 output to bypass efficient power
for VREG3 pin. VOUT2 is also for the SMPS2 output soft-discharge.
8
VREG3
3.3V Linear Regulator Output.
Boost Flying Capacitor Connectionhttp://www.DataSheet4U.net/ for SMPS2. Connect to an external capacitor
9
BOOT2
according to the typical application circuits.
10
UGATE2
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
11
PHASE2
UGATE2 high side gate driver. PHASE2 is also the current-sense input for the
SMPS2.
12
LGATE2
Lower Gate Driver Output for SMPS2. LGATE2 swings between GND and
VREG5.
13 EN
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.
Operation Mode Selectable Input.
14
SKIPSEL
Connect to VREG5 or VREG3 : Ultrasonic Mode
Connect to REF : PWM Mode
Connect to GND : DEM Mode
16 VIN
Supply Input for 5V/3.3V LDO and Feed Forward On-Time circuitry.
17
VREG5
5V Linear Regulator Output. VREG5 is also the supply voltage for the lower gate
driver and analog supply voltage for the device.
18
NC
(RT8223L)
ENC
No Internal Connection.
SMPS Enable Input. Pull up to VREG3 or VREG5 to turn on both switch channels.
(RT8223M) Short to GND to shutdown them.
19
LGATE1
Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and
VREG5.
www.richtek.com
4
To be continued
DS8223L/M-04 April 2011
datasheet pdf - http://www.DataSheet4U.net/
Page 4
Part Number RT8223M
Manufactur Richtek
Description (RT8223L/M) Main Power Supply Controller
Total Page 24 Pages
PDF Download
RT8223M datasheet
Download PDF File
RT8223M datasheet
View Html for PC & Mobile


Related Datasheet

RT8223A , RT8223B , RT8223L , RT8223M , RT8223P ,

site map

webmaste! click here

contact us

Buy Components