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PDF RT8203 Data sheet ( Hoja de datos )
| Número de pieza | RT8203 | |
| Descripción | Main Power-Supply Controllers | |
| Fabricantes | Richtek | |
| Logotipo |  |
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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-on” response, 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
1 page  
RT8203
Pin No. Pin Name
15 PHASE5
16 UGATE5
17 V CC
18 LD O5
19 LGATE5
20 V IN
21 VOUT5
22 VOUT3
23 GND
24 LG ATE3
25 LDO3
26 U GATE3
27 PH ASE3
28 B OOT3
Pin Function
Inductor Connection for 5V SMPS. PHASE5 is the internal lower supply rail for the
UGAT E5 high-side gate driver, and the current-sense input for the 5V SMPS.
High-Side N-MOSFET Floating Gate-Driver Output for VOUT5. Swings between
PHASE5 and BOOT5.
Analog Supply Voltage Input for the internal analog integrated circuit. Bypass to GND
with a 1μF ceramic capacitor.
5V Linear Regulator O utput. LD O5 is the gate dr iver s upply for the external
MOSFETs. LDO5 c an provide a t otal of 100 mA, including the MO SFET gate -driver
requirements and ex ternal l oads. If V OUT5 i s gr eater t han the LD O5 s witchover
threshold, the LD O5 regulator shuts down and LDO5 pin connects to VOUT5 through
a 1.4Ω switch. Bypass a 4.7μF ce ramic capacitor t o GND.
Low-side N-MOSFET G ate-Drive O utput for V OUT5. Swings between G ND and
LDO 5 .
Power-Supply Input. V IN p owers the LDO5/LDO3 l inear r egulators and is al so us ed
for PWM control circuits. Connect VIN to the batter y input or the AC adapter output.
VOUT 5 Sense Input. Connect to the 5V output. VOUT5 is an input to the PWM control
circuit. It al so s erves as t he 5V fe edback i nput i n fi xed-voltage mode. If V OUT5 is
greater than t he LDO5 switchover t hreshold, the L DO5 shuts down a nd LDO5
connects to VOUT 5 through 1.4Ω switch.
VOUT 3 S ense I nput. C onnect to the 3. 3V o utput. V OUT3 i s an i nput t o t he P WM
control c ircuit. I t al so s erves as t he 3. 3V feedback i nput i n fi xed-voltage mode. If
VOUT 3 i s gr eater t han th e LD O3 s witchover threshold, the LD O3 s huts do wn and
LDO3 connects to VOUT3 through 1.5Ω sw itch.
Analog and Power Ground.
Low-side N-MOSFET G ate-Drive O utput for V OUT3. Swings between G ND and
LDO 5 .
3.3V Linear Regulator Output. LDO3 can provide a total of 100mA to external loads. If
VOUT 3 i s greater t han th e LDO3 s witchover th reshold, t he LDO3 r egulator shuts
down a nd LDO3 p in connects to V OUT3 th rough a 1.5Ω s witch. B ypass a 4 .7μF
ceramic capacitor to GND.
High-Side N-MOSFET Floating Gate-Driver Output for VOUT3. Swings between
PHASE3 and BOOT3.
Inductor Connection for 3.3V SMPS. PHASE3 i s th e internal lower supply r ail for the
UGAT E3 high-side gate driver, and the current-sense input for the 3.3V SMPS.
Boost Capacitor Connection for 3.3V SMPS. Connect an external ceramic capacitor to
PHASE3 and an external diode to LDO5.
DS8203-02 September 2008
www.richtek.com
5
5 Page 
RT8203
Typical Operating Chara cteristics
No load on LDO5, LDO3,VOUT5, VOUT3 and REF, TON = VCC, EN = VIN, TA = 25°C, unless otherwise specified.
VOUT5 Efficiency vs. Load Current
100
90
80
70 Diode-Emulation Mode
60 Ultrasonic Mode
50 Forced CCM Mode
40
30
20
10
0
0.001
VIN = 8V
ON3 =GND, ON5 =VCC
COUT = 330uF, L = 7.6uH
0.01 0.1
1
Load Current (A)
10
VOUT5 Efficiency vs. Load Current
100
90
80
70
Diode-Emulation Mode
60
Ultrasonic Mode
50
40 Forced CCM Mode
30
20
10
0
0.001
VIN = 12V,
ON3 = GND, ON5 =VCC
COUT = 330uF, L = 7.6uH
0.01 0.1
1
Load Current (A)
10
VOUT5 Efficiency vs. Load Current
100
90
80
70
60 Diode-Emulation Mode
50 Ultrasonic Mode
40
Forced CCM Mode
30
20
10
0
0.001
VIN = 24V,
ON3 = GND, ON5 = VCC
COUT = 330uF, L = 7.6uH
0.01 0.1
1
Load Current (A)
10
VOUT3 Efficiency vs. Load Current
100
90
80
70
Diode-Emulation Mode
60
Ultrasonic Mode
50
40 Forced CCM Mode
30
20
10
0
0.001
VIN = 8V,
ON3 = ON5 = VCC
COUT = 470uF, L = 4.7uH
0.01 0.1
1
Load Current (A)
10
VOUT3 Efficiency vs. Load Current
100
90
80
70
60 Diode-Emulation Mode
50
40
30
20
10
0
0.001
Ultrasonic Mode
Forced CCM Mode
VIN = 12V,
ON3 = ON5 = VCC
COUT = 470uF, L = 4.7uH
0.01 0.1
1
Load Current (A)
10
VOUT3 Efficiency vs. Load Current
100
90 Diode-Emulation Mode
80
70
60
Ultrasonic Mode
50
40
30 Forced CCM Mode
20
10
0
0.001
VIN = 24V,
ON3 = ON5 = VCC
COUT = 470uF, L = 4.7uH
0.01 0.1
1
Load Current (A)
10
DS8203-02 September 2008
www.richtek.com
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet RT8203.PDF ] | |
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