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PDF RT8204 Data sheet ( Hoja de datos )
| Número de pieza | RT8204 | |
| Descripción | Single Synchronous Buck | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8204 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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RT8204
Single Synchronous Buck with LDO Controller
General Description
The RT8204 PWM controller provides the high efficiency,
excellent transient response, and high DC output accuracy
needed for stepping down high voltage batteries to
generate low voltage CPU core, I/O, and chipset RAM
supplies in notebook computers.
The constant-on-time PWM control scheme handles wide
input/output voltage ratios with ease and provides 100ns
“instant-on” response to load transients while maintaining
a relatively constant switching frequency.
The RT8204 achieves high efficiency at a reduced cost
by eliminating the current sense resistor found in
traditional current mode PWMs. Efficiency is further
enhanced by its ability to drive very large synchronous
rectifier MOSFETs. The buck conversion allows this device
to directly step down high voltage batteries for the highest
possible efficiency. The RT8204 is intended for CPU core,
chipset, DRAM, or other low voltage supplies as low as
0.75V.
A built-in LDO controller can drive an external N-MOSFET
to provide a second output voltage from PWM output or
other power source. The RT8204 can provide adjustable
voltage down to 0.75V and maximum output voltage is
depended on the selected MOSFET. The internal 0.75V
reference voltage with ±1.5% accuracy provides tight
regulation for the output voltage. The independent enable
control, open drain power good indicator, under voltage
protection and soft start make RT8204 to power the
system friendly. The RT8204 is available in WQFN-16L
3x3 package.
Applications
z Notebook Computers
z CPU Core Supply
z Chipset/RAM Supply as Low as 0.75V
Features
z PWM Controller
` Ultra-High Efficiency
` Resistor Programmable Current Limit by Low Side
RDS(ON) Sense (Lossless Limit) or Sense Resistor
(High Accuracy)
` Quick Load Step Response within 100ns
` 1% VOUT Accuracy Over Line and Load
` Adjustable 0.75V to 3.3V Output Range
` 3V to 26V Battery Input Range
` Resistor Programmable Frequency
` Over/Under Voltage Protection
` 2 Steps Current Limit During Soft-Start
` Drives Large Synchronous-Rectifier FETs
` Power Good Indicator
z LDO Controller
` 1.5% Accuracy Over Line and Load
` Adjustabe Output Voltage Down to 0.75V
` Independent Enable and Power Good Indicator
` Drive N-MOSFETs within Rail to Rail Controller
Voltage
` MLCC and POSCAP Stable
z RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT8204
Package Type
QW : WQFN-16L 3x3 (W-Type)
Note :
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
DS8204-06 April 2011
www.richtek.com
1
1 page  
RT8204
Absolute Maximum Ratings (Note 1)
z Input Voltage, TON to GND ---------------------------------------------------------------------------------------------- −0.3V to 32V
z BOOT to GND -------------------------------------------------------------------------------------------------------------- −0.3V to 38V
z PHASE to BOOT ---------------------------------------------------------------------------------------------------------- −6V to 0.3V
z PHASE to GND
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 32V
<20ns ------------------------------------------------------------------------------------------------------------------------ −8V to 38V
z VDD, VDDP, VOUT, EN/DEM, LEN, LFB, FB, PGOOD, LPGOOD, LDRV to GND ----------------------- −0.3V to 6V
z UGATE to PHASE
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
<20ns ------------------------------------------------------------------------------------------------------------------------ −5V to 7.5V
z OC to GND ------------------------------------------------------------------------------------------------------------------ −0.3V to 28V
z LGATE to GND
DC ----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
<20ns ------------------------------------------------------------------------------------------------------------------------ −2.5V to 7.5V
z Power Dissipation, PD @ TA = 25°C
WQFN-16L 3x3 ------------------------------------------------------------------------------------------------------------ 1.471W
z Package Thermal Resistance (Note 2)
WQFN-16L 3x3, θJA ------------------------------------------------------------------------------------------------------- 68°C/W
WQFN-16L 3x3, θJC ------------------------------------------------------------------------------------------------------ 7.5C/W
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
z Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
z Input Voltage, VIN ---------------------------------------------------------------------------------------------------------- 3V to 26V
z Supply Voltage, VDD, VDDP ---------------------------------------------------------------------------------------------- 4.5V to 5.5V
z Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VDD = VDDP = 5V, VIN = 15V, VOUT = 1.25V, EN/DEM = VDD, RTON = 1MΩ, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max
PWM Controller
Quiescent Supply Current
TON Operating Current
Shutdown Current
ISHD N
VDD + VDDP, FB = 0.8V, forced above
the regulation point
RTON = 1MΩ
VDD + VDDP
TON
EN/DEM = 0V
--
--
--
--
−10
-- 1250
15 --
1 10
1 --
−1 --
Unit
μA
μA
μA
DS8204-06 April 2011
To be continued
www.richtek.com
5
5 Page 
VOUT
(1V/Div)
LDRI
(5V/Div)
ILOAD
(20A/Div)
LPGOOD
(5V/Div)
LDO Short-Circuit Protection
VIN = 1.25V, COUT = 10μF x 2, VOUT2 Short
Time (100μs/Div)
RT8204
DS8204-06 April 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet RT8204.PDF ] | |
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