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PDF RT8223M Data sheet ( Hoja de datos )
| Número de pieza | RT8223M | |
| Descripción | (RT8223L/M) Main Power Supply Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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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/
1 page  
RT8223L/M
Pin No.
20
Pin Name
PHASE1
21 UGATE1
22 BOOT1
23 PGOOD
24 VOUT1
15,25
(Exposed Pad)
GND
Pin Function
Switch Node 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.
Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and
BOOT1.
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor
according to the typical application circuits.
Power Good Output for Channel 1 and Channel 2. (Logical AND).
Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass efficient 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 large PCB
and connected to GND for maximum power dissipation.
Function Block Diagram
BOOT1
UGATE1
PHASE1
LGATE1
FB1
ENTRIP1
EN
ENC
VOUT1
TONSEL SKIPSEL
VREG5
VREG5
SMPS1
PWM Buck
Controller
10µA
VREG5
SMPS2
PWM Buck
Controllerhttp://www.DataSheet4U.net/
VREG5
10µA
Power-On
Sequence
Clear Fault Latch
SW5 Threshold
Thermal
Shutdown
SW3 Threshold
BOOT2
UGATE2
PHASE2
LGATE2
VOUT2
FB2
ENTRIP2
PGOOD
GND
VREG5
VIN
VREG5
REF
VREG3
VREG3
REF
DS8223L/M-04 April 2011
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Typical Operating Characteristics
VOUT1 Efficiency vs. Load Current
100
90 DEM Mode
80
70 Ultrasonic Mode
60
50 PWM Mode
40
30
20
10
0
0.001
VIN = 8V, TONSEL = GND, EN = FLOATING,
VENTRIP1 = 1.5V, VENTRIP2 = 5V
0.01 0.1
1
Load Current (A)
10
RT8223L/M
VOUT1 Efficiency vs. Load Current
100
90 DEM Mode
80
70
60 Ultrasonic Mode
50
40 PWM Mode
30
20
10
0
0.001
VIN = 12V
TONSEL = GND, EN = FLOATING,
VENTRIP1 = 1.5V, VENTRIP2 = 5V
0.01
0.1
1
Load Current (A)
10
VOUT1 Efficiency vs. Load Current
100
90
DEM Mode
80
70
60 Ultrasonic Mode
50
PWM Mode
40
30
20
10
0
0.001
VIN = 20V
TONSEL = GND, EN = FLOATING,
VENTRIP1 = 1.5V, VENTRIP2 = 5V
0.01
0.1
1
Load Current (A)
10
http://www.DataSheet4U.net/
VOUT2 Efficiency vs. Load Current
100
90
80 DEM Mode
70
60 Ultrasonic Mode
50
PWM Mode
40
30
20
10
0
0.001
VIN = 8V
TONSEL = GND, EN = FLOATING,
VENTRIP1 = 5V, VENTRIP2 = 1.5V
0.01 0.1
1
Load Current (A)
10
VOUT2 Efficiency vs. Load Current
100
90
80 DEM Mode
70
60 Ultrasonic Mode
50 PWM Mode
40
30
20
10
0
0.001
VIN = 12V
TONSEL = GND, EN = FLOATING,
VENTRIP1 = 5V, VENTRIP2 = 1.5V
0.01
0.1
1
Load Current (A)
10
VOUT2 Efficiency vs. Load Current
100
90
80 DEM Mode
70
60
Ultrasonic Mode
50
40
30
20
10
0
0.001
PWM Mode
VIN = 20V
TONSEL = GND,EN = FLOATING,
VENTRIP1 = 5V, VENTRIP2 = 1.5V
0.01 0.1
1
Load Current (A)
10
DS8223L/M-04 April 2011
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet RT8223M.PDF ] | |
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