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PDF RT8106 Data sheet ( Hoja de datos )
| Número de pieza | RT8106 | |
| Descripción | 5V/12V Synchronous Buck PWM DC-DC Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8106 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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RT8106/A
5V/12V Synchronous Buck PWM DC-DC Controller
General Description
The RT8106/A is a DC/DC synchronous buck PWM
controller with embedded driver support up to 12V+12V
boot-strapped voltage for high efficiency power driving. The
part integrates full functions of voltage regulation, power
monitoring and protection into a single small footprint
WDFN-10L 3x3 (Exposed Pad) package.
The RT8106/A adopts a high-gain voltage mode PWM
control for simple application design. An internal 0.8V
reference allows the output voltage to be precisely
regulated for low voltage requirement. Based on all
RT8106/A features, the part provides an optimum
compromise between efficiency, total B.O.M. count, and cost.
Ordering Information
RT8106/A
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
600kHz
300kHz
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 Single 5 to 12V Bias Supply
z Drive All Low Cost N-MOSFETs
z Support High Current Application up to 30A
z High-Gain Voltage Mode PWM Control
z 300kHz/600kHz Fixed Frequency Oscillator
z Fast Transient Response :
` High-Speed EA Amplifier
` 0 to 85% Duty Ratio
` External Compensation in The Control Loop
z Internal Soft-Start
z Adaptive Non-Overlapping Gate Driver
z Over Current Fault Monitor on low side MOSFET
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Graphic Card
z Motherboard, Desktop Servers
z IA and Telecom Equipment
z General High Power DC/DC Regulator
Pin Configurations
(TOP VIEW)
BOOT 1
LX 2
UGATE 3
LGATE 4
GND 5
GND
11
10 PGOOD
9 VOS
8 FB
7 COMP/EN
VCC
WDFN-10L 3x3
Marking Information
RT8106GQW
DY=YM
DNN
DY= : Product Code
YMDNN : Date Code
RT8106AGQW
EP=YM
DNN
EP= : Product Code
YMDNN : Date Code
DS8106/A-04 April 2011
www.richtek.com
1
1 page  
RT8106/A
Parameter
Symbol
Test Conditions
Min Typ Max Unit
PWM Controller
EA Open Loop Gain
EA Bandwidth
GEA
BW
Maximum Duty
RT8106
RT8106A
UGATE Drive Source
LGATE Drive Source
IUGATEsr
ILGATEsr
UGATE Drive Sink
LGATE Drive Sink
Ramp Valley
RUGATEsk
RLGATEsk
Ramp Amplitude
RT8106
PWM Frequency
RT8106A
ΔVOSC
fOSC
Over Voltage Threshold
OVP
Relative to VOS
Under Voltage Threshold
UVP
Relative to VOS
PGOOD Threshold
PGOOD Relative to VOS
OC Current Source
OC Preset Trigger Voltage
Disable Threshold
PGOOD Active Threshold
IOC
VOC_Preset
VDIS
ROCSET is not Connected
Relative to VOS Rising
Relative to VOS Falling
PGOOD Low Level
VOL_PGOOD Sink 4mA
-- 80 -- dB
-- 15 -- MHz
-- 85 --
%
-- 80 --
%
1.5 --
--
A
1.5 --
--
A
-- 1.1 --
Ω
-- 0.65 --
Ω
-- 1.6 --
V
-- 1.2 --
V
270 300 330
kHz
540 600 660
115 125 135 %
65 75 80
%
90 -- 110 %
9 10 11 μA
-- 0.55 --
V
-- -- 0.5 V
85 -- 95 %
105 -- 115 %
-- -- 0.4 V
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 the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard. The case point of θJC is on the expose pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
DS8106/A-04 April 2011
www.richtek.com
5
5 Page 
TS
Vg1 TON TOFF
Vg2
VL
iL
ΔIL
iS1
VIN - VOUT
- VOUT
IL = IOUT
RT8106/A
2) Output Capacitor Selection
The selection of output capacitor depends on the output
ripple voltage requirement. Practically, the output ripple
voltage is a function of both capacitance value and the
equivalent series resistance (ESR) rC. Figure 7. shows
the related waveforms of output capacitor.
iL
dditL=
VIN-VOUT
L
diL
dt
=
VOUT
L
IOUT
TS
iC
0
1/2ΔIL
ΔIL
VOC
iS2
Figure 6. The Waveforms of Synchronous Step-Down
Converter
According to Figure 6. the ripple current of inductor can
be calculated as follows :
VIN
−
VOUT
=
L
ΔIL
Δt
;
Δt
=
D
fs
;
D
=
VOUT
VIN
L
=
(VIN
−
VOUT
)×
VIN
VOUT
× fs ×
ΔIL
Where :
VIN = Maximum input voltage
VOUT = Output Voltage
Δt = S1 turn on time
ΔIL = Inductor current ripple
fS = Switching frequency
D = Duty Cycle
rC = Equivalent series resistor of output capacitor
(1)
VOR
0
ΔVOC
ΔIL x rc
t1 t2
Figure 7. The Related Waveforms of Output Capacitor
The AC impedance of output capacitor at operating
frequency is quite smaller than the load impedance, so
the ripple current (ΔIL) of the inductor current flows mainly
through the output capacitor. The output ripple voltage is
described as :
ΔVOUT = ΔVOR + ΔVOC
ΔVOUT
=
ΔIL
× rc
+
1
CO
∫ t2
t1
iC
dt
ΔVOUT
=
ΔIL
× ΔIL
× rc
+
1
8
VOUT
COL
(1− D)TS2
(2)
(3)
(4)
where ΔVOR is caused by ESR and ΔVOC by capacitance.
For electrolytic capacitor application, typically 90% to 95%
of the output voltage ripple is contributed by the ESR of
the output capacitor. So Equation (4) can be simplified
as: ΔVOUT = ΔIL x rC
(5)
DS8106/A-04 April 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RT8106.PDF ] | |
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