900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




  Richtek Technology Electronic Components Datasheet  

RT8203 Datasheet

Main Power-Supply Controllers

No Preview Available !

RT8203
High-Efficiency, Quad Output, M ain Power- Supply
Controllers for Notebook Computers
General D escription
Features
The RT8203 dual step-down, switch-mode power-supply
(SMPS) controllers generate logic-supply voltages in
battery-powered systems. The RT8203 include two pulse-
width modulation (PWM) controllers, adjustable from 2V
to 5.5V or fixed at 5Vand 3.3V. These devices feature two
linear regulators providing 5Vand 3.3Valways-on outputs.
Each linear regulator provides up to 100mAoutput current
with automatic linear regulator bootstrapping to the main
SMPS outputs. The RT8203 include on-board power-up
sequencing, a power-good (PGOOD) output, internal soft-
start, and soft-shutdown output discharge that prevents
negative voltage s on shutdown. RichTek's proprietary
Mach-PWMTM instant-onresponse, con stant on-time
PWM control scheme operates without sense resistors
and provides 100n s respon se to loa d transients while
maintaining a relatively constant switching frequency. The
unique ultrasonic mode maintains the switching frequency
above 25kHz, which emli inates noise in audio paplications.
Other features include diode-emulation, which maximizes
efficiency in light-load applications, and fixed-frequency
PWM mode, which reduces RF interference in sensitive
application s. The R T8203 provides a pin-sele ctable
switching frequency, allowing either 200kHz/300kHz or
400kHz/500kHz operation of the 5V/3.3V SMPSs,
respectively. The RT8203 is available in SSOP-28 pcakage.
Ordering Information
RT8203
Package Type
A : SSOP-28
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Pb-free a nd Green products are :
` RoHS compli ant and compatible with the current require-
ments of IPC/JEDEC J-ST D-020.
` Suitable for use in SnPb or Pb-free soldering processes.
z No Current-Sense Resistor Needed
z 1.5% Output Voltage Accuracy
z 3.3V and 5V 100mABootstrapped Linear Regulators
z Internal Soft-Start and Soft-Shutdown Output
Discharge
z Mach-PWM with 100ns Load Step Response
z 3.3V and 5V Fixed or Adjustable Outputs
z 7V to 24V Input Voltage Range
z Ultrasonic Mode Operation 25kHz (min.)
z Power-Good (PGOOD) Signal
z Over Voltage Protection
z Under Voltage Protection
z Over Temperature Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Application s
z Notebook and Subnotebook Computers
z PDAs and Mobile CommunicationDevices
z 3- and 4-Cell Li+ Battery-PoweredDevices
Pin Configuration s
(TOP VIEW)
NC
PGOOD
ON 3
ON5
IL IM 3
EN
FB 3
VR EF
FB 5
PRO
IL IM 5
SKIP
TO N
BOOT 5
28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
1S4 SOP-2158
BOOT 3
PHASE3
UG AT E3
LD O 3
LG ATE3
GND
VO UT 3
VO UT 5
VIN
LG ATE5
LD O 5
VCC
UG AT E5
PHASE5
SSOP-28
DS8203-02 September 2008
www.richtek.com
1
http://www.Datasheet4U.com


  Richtek Technology Electronic Components Datasheet  

RT8203 Datasheet

Main Power-Supply Controllers

No Preview Available !

RT8203
Typical Application Circuit
5V
ALWAYS ON
C1
4.7uF
VCC
V OU T5
5V
C1 0
18
C2
1uF R1
R2
47
LDO5
3.9 17 VCC
ON3 3
5 ILIM3
ON5 4
11
IL IM 5
LDO3 25
C3
1uF
20 VIN
R6
PRO 10 1M
C5 RT8203
0.1uF BAT254
C6
10 uF
Q1
AO4702
L1
D1
R3
2.2 14 BOOT5
C8
0.1uF
16 UGA TE5
15 PHASE 5
6
EN R4
BOOT 3 28 2.2
UGATE3 26
27
PH ASE3
VIN
7V to 24V
C4
4.7uF
VREF
VCC
3.3V ALWAYS ON
D2
BAT254
ON
C9
0.1uF
OFF
C7
10 uF
Q2
AO4702
L2
VOUT3
3.3V
BSC119 N03
D3 Q3
19 LGATE5
C12
0.22uF
SEE
TABLE
13 TON
21 VOUT5
8 VREF
9 FB5
23 GND
LGATE3 24
Q4
BSC 119N03
VOUT3 22
SKIP 12
FB3 7
NC 1
PGOOD 2
VCC
R5
100 k
D4 C11
Power-Good
INDICATOR
Frequency-dependent Components
VOUT5
VOUT3
TON = VCC TON = GND TON = VCC TON = GND
f = 200 kHz f = 400 kHz f = 300 kHz f = 500kHz
L1 = 7.6uH L1 = 5.6uH L2 = 4.7uH
L2 = 3uH
C10 = 330uF C10 = 150uF C11 = 470uF C11 = 220uF
Figure 1. Fixed Voltage Regulator
www.richtek.com
2
DS8203-02 September 2008


Part Number RT8203
Description Main Power-Supply Controllers
Maker Richtek
PDF Download

RT8203 Datasheet PDF






Similar Datasheet

1 RT8202 Single Synchronous Buck Controller
Richtek
2 RT8202A Single Synchronous Buck Controller
Richtek
3 RT8202B Single Synchronous Buck Controller
Richtek
4 RT8202L (RT8202L/M) Single Synchronous Buck Controller
Richtek
5 RT8202M (RT8202L/M) Single Synchronous Buck Controller
Richtek
6 RT8203 Main Power-Supply Controllers
Richtek
7 RT8204 Single Synchronous Buck
Richtek
8 RT8204A Single Synchronous Buck
Richtek
9 RT8204B Single Synchronous Buck
Richtek





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy