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PDF RT8223B Data sheet ( Hoja de datos )
| Número de pieza | RT8223B | |
| Descripción | (RT8223A/B) Main Power Supply Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8223B (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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RT8223A/B
High Efficiency, Main Power Supply Controller
for Notebook Computers
General Description
Features
The RT8223A/B dual step-down, switch-mode power-
supply 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 soft-
start, and internal soft-discharge output that prevents
negative voltages on shutdown.
A constant on-time PWM control scheme operates without
sense resistor and provides 100ns response to load
transients while maintaining a relatively constant switching
frequency. The unique ultrasonic mode maintains the
switching frequency above 25kHz, which eliminates noise
in audio applications. Other features include diode-
emulation mode (DEM), which maximizes efficiency in
light-load applications, and fixed-frequency PWM mode,
which reduces RF interference in sensitive application
z Wide Input Voltage Range 6V to 25V
z Dual Fixed 5V/3.3V Outputs or Adjustable from 2V
to 5.5V, 1.5% Accuracy
z Fixed 3.3V and 5V LDO Output : 70mA
z 2V Reference Voltage ±1% : 50μA
z Constant ON-Time Control with 100ns Load Step
Response
z Frequency Selectable via TONSEL Setting
z RDS(ON) Current Sensing and 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
Notebook and Sub-Notebook Computerszhttp://www.DataSheet4U.net/
z 3-Cell and 4-Cell Li+ Battery-Powered Devices
Marking Information
Ordering Information
RT8223
Package Type
QW : WQFN-24L 4x4 (W-Type)
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
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
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Function Block Diagram
TONSEL SKIPSEL
BOOT1
UGATE1
PHASE1
LGATE1
PGND
VOUT1
FB1
ENTRIP1
EN
ENC
VREG5
SMPS1
PWM Buck
Controller
Power-On
Sequence
Clear Fault Latch
SW Threshold
SMPS2
PWM Buck
Controller
VREG5
SW Threshold
VREG5
VIN
Thermal
Shutdown
VREG5
REF
VREG3
TONSEL VIN
REF
Function Block Diagram
http://www.DataSheet4U.net/
RT8223A/B
BOOT2
UGATE2
PHASE2
LGATE2
VOUT2
FB2
ENTRIP2
PGOOD
GND
VREG3
VOUT
REF
FB
PGOOD
On-Time
Compute
+
-
+-
Q
TON
R
1-Shot
TRIG
- Comp
+
TOFF
TRIG 1-Shot
Q
1.1 x VREF
0.6 x VREF
0.9 x VREF
Over-Voltage
+ Fault
- Latch
- Blanking
+ Time
Under-Voltage
-
+
SS
Time
Current
Limit
+
S
-
-
+
25kHz
Detector Zero
Detector
+
-
UGATE
VREG5
LGATE
+ ENTRIP
-
PHASE
DS8223A/B-04 April 2011
SKIPSEL
PWM Controller (One Side)
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
RT8223A/B
Parameter
Logic Input
FB1/FB2 Input Voltage
SKIPSEL Input Voltage
ENTRIPx Input Voltage
EN Voltage
EN Current
ENC Threshold Voltage
(RT8223B)
TONSEL Setting Voltage
Input Leakage Current
Internal BOOT Switch
Internal Boost Charging
Switch On-Resistance
Power MOSFET Drivers
UGATEx On-Resistance
LGATEx On-Resistance
Dead Time
Symbol
Test Conditions
V ENTRI Px
VEN
IEN
VENC
Low Level (Internal Fixed VOUTx)
High Level (Internal Fixed VOUTx)
Low Level (DEM Mode)
REF Level (PWM Mode)
High Level (Ultrasonic Mode)
Low Level (SMPSs Off)
On Level (SMPSs On)
High Level (SMPSs Off)
Shutdown
Enable
Open
VEN = 0.2V (Source)
VEN = 3.3V (Sink)
Shutdown
Enable
VOUT1/VOUT2 = 200kHz/250kHz
VOUT1/VOUT2 = 300kHz/375kHz
VOUT1/VOUT2 = 400kHz/500kHz
TONSEL, SKIPSEL = 0V or 5V
ENC = 0V or 5V (RT8223B)
http://www.DataSheet4U.net/
VREG5 to BOOTx
UGATEx, High state
UGATEx, Low state
LGATEx, High State
LGATEx, Low State
LGATEx Rising
UGATEx Rising
Min Typ Max Unit
-- -- 0.2
V
4.5 --
--
-- -- 0.8
1.8 -- 2.3 V
2.7 --
--
-- -- 0.35
0.5 -- 2 V
4.5 --
--
-- -- 0.4
2.4 -- -- V
2.4 3.3 4.2
13 5
μA
-- 3 8
-- -- 0.6
V
2 -- --
-- -- 0.8
1.8 -- 2.3 V
2.7 --
--
−1 --
−1 --
1
μA
1
-- 20 -- Ω
-- 3 6
-- 1.5 4
-- 2.2 5
Ω
-- 0.6 1.5
-- 30 --
ns
-- 40 --
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. θJA is measured in natural convection at TA = 25°C on a high effective thermal conductivity four-layer test board of
JEDEC 51-7 thermal measurement standard. The measurement case positions of θJC are on the lead of the SOP
package and the expose pad for the SOP(Exposed Pad) package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. PVIN + PVREG5
DS8223A/B-04 April 2011
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet RT8223B.PDF ] | |
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