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PDF RT9209 Data sheet ( Hoja de datos )
| Número de pieza | RT9209 | |
| Descripción | Synchronous Buck PWM DC-DC | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT9209/A
Synchronous Buck PWM DC-DC with Enable & PGOOD
General Description
The RT9209/A is a single power supply PWM DC-DC
converter controller designed to drive N-MOSFET in a
synchronous buck topology. The IC integrates the control,
output adjustment, monitoring and protection functions into
a small 8-pin package.
The RT9209/A uses an internal compensated voltage mode
PWM control for simple application design. An internal
0.8V reference allows the output voltage to be precisely
regulated to low voltage requirement. A fixed 260kHz/
400kHz oscillator reduce the component size for saving
board area.
The RT9209/A future a enable control pin to shutdown PWM
switching and a 90% power good flag indicator. The FB
pin under voltage detection function monitor the output
short circuit which trigger a three time hiccup sequence
to latch off the chip function.
Ordering Information
RT9209/A
Package Type
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
400kHz
260kHz
Note :
RichTek Pb-free and Green 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.
`100%matte tin (Sn) plating.
Features
z Operates at 5V
z 0.8V Internal Reference
z Drives Two N-MOSFET
z Voltage Mode PWM Control
z Fast Transient Response
z Fixed 260kHz/400kHz Oscillator Frequency
z Dynamic 0 to 100% Duty Cycle
z Internal PWM Loop Compensation
z Internal Soft-Start
z Adaptive Non-Overlapping Gate Driver
z Over-Voltage Protection Uses Lower MOSFET
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Motherboard Power Regulation for Computers
z Subsystems Power Supplies
z Cable Modems, Set Top Box, and DSL Modems
z DSP and Core Communications processor Supplies
z Memory Power Supplies
z Personal Computer Peripherals
z Industrial Power Supplies
z 5V-Input DC-DC Regulators
z Low Voltage Distributed Power Supplies
Pin Configurations
(TOP VIEW)
FB
VCC
LGATE
GND
8
27
36
45
SOP-8
SS
PGOOD
BOOT
UGATE
DS9209/A-08 March 2007
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/
1 page  
Electrical Characteristics
(VCC = 5V, TA = 25°C, Unless otherwise specified.)
Parameter
Symbol
Test Conditions
VCC Supply Current
Nominal Supply Current
Power-On Reset
ICC UGATE, LGATE open
Rising VCC Threshold
VCC Threshold Hysteresis
Reference
Reference Voltage
Oscillator
RT9209
Free Running Frequency
RT9209A
Ramp Amplitude
Error Amplifier
Δ VOSC
DC gain
PWM Controller Gate Driver
Upper Drive Source
Upper Drive Sink
Lower Drive Source
Lower Drive Sink
Protection
RUGATE
RUGATE
RLGATE
RLGATE
BOOT= 12V
BOOT-VUGATE = 1V
VUGATE = 1V
VCC - VLGATE = 1V,
VLGATE = 1V
FB Over-Voltage Trip
FB Rising
FB Under-Voltage Trip
FB Falling
Power Good Threshold
FB pin Rising
Power Good Hysteresis
Power Good Sink Capability
SS Source Current
IPGOOD = 1mA
RT9209/A
Min Typ Max Units
-- 3 6 mA
3.7 4.1 4.5
0.3 0.5 0.7
V
V
0.784 0.8 0.816 V
210 260 310
kHz
350 400 450
-- 1.75 -- VP-P
33 35 40 dB
-- 7 12 Ω
-- 7 7.5 Ω
-- 7 6 Ω
-- 3 4 Ω
-- 1 -- V
-- 0.6 --
V
86 90 95 %
-- 2 -- %
-- 0.4 V
12 20 32 μA
DS9209/A-08 March 2007
www.richtek.com
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
COUNT = 1
4V
2V
0V
COUNT = 2 COUNT = 3
OVERLOAD
APPLIED
0A
T0 T1
T2
TIME
Figure 3
T3
Inductor Selection
The RT9209/A was designed for VIN = 5V, step-down
application mainly. Figure 4 shows the typical topology
and waveforms of step-down converter.
The ripple currents of inductor can be calculated as follows:
(5V - VOUT)
ILRIPPLE =
× TON
L
Because operation frequency is fixed at 260kHz/400kHz,
VOUT
VOUT
TON = 3.85 ×
, or 2.5 ×
5V 5V
The VOUT ripple is
VOUT RIPPLE = ILRIPPLE × ESR
ESR is output capacitor equivalent series resistor
RT9209/A
L
Q
VI D C R VO
C.C.M.
TS
VL
iL
TON TOFF
VI - VO
- VO
uIL
uQ
IL = IO
iQ
IQ
iD
ID
Figure 4
DS9209/A-08 March 2007
www.richtek.com
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet RT9209.PDF ] | |
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