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PDF RT9202 Data sheet ( Hoja de datos )
| Número de pieza | RT9202 | |
| Descripción | Single Synchronous Buck PWM DC-DC Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT9202
Single Synchronous Buck PWM DC-DC Controller
General Description
The RT9202 is a single power supply PWM DC-DC
converter controller designed to drive N-channel
MOSFET in a synchronous buck topology. The IC
integrates the control, output adjustment, monitoring
and protection functions in a small 8-pin package.
The RT9202 uses a low gain 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 300kHz
oscillator reduces the component size for saving
board space.
The RT9202 features over current protection, over
voltage protection, and under voltage lock-out. The
output current is monitored by sensing the voltage
drop across the MOSFET’s RDS(ON), which eliminates
the need for a current sensing resistor.
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
Features
z Operate from 5V
z 0.8V Internal Reference
z Drive Two N-channel MOSFET
z Voltage Mode PWM Control
z Fast Transient Response
z Fixed 300kHz Oscillator Frequency
z Full 0~100% Duty Cycle
z Internal Soft Start
z Adaptive Non-overlapping Gate Driver
z Over-current Monitor Uses MOSFET RDS(ON)
z Over-voltage Protection Uses Low-side
MOSFET
Pin Configurations
Part Number
Pin Configurations
RT9202CS
(Plastic SOP-8)
TOP VIEW
BOOT 1
UGATE 2
8 PHASE
7 OCSET
GND 3
LGATE 4
6 FB
5 VCC
Ordering Information
RT9202
Package type
S : SOP-8
Operating temperature range
C: Commercial standard
DS9202-02 August 2002
www.richtek.com
1
1 page  
RT9202
Absolute Maximum Ratings
z Supply Voltage VCC
7V
z BOOT & UGATE to GND
15V
z Input, Output or I/O Voltage
GND−0.3V ~ 7V
z Power Dissipation, PD @ TA = 25°C
SOP-8
0.625W
z Package Thermal Resistance
SOP-8, θJA
z Ambient Temperature Range
160°C/W
0°C ~ +70°C
z Junction Temperature Range
-40°C ~ +125°C
z Storage Temperature Range
-65°C ~ +150°C
z Lead Temperature (Soldering, 10 sec.)
260°C
CAUTION:
Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress only rating and operation of the device at these or any other conditions above those
indicated in the operational sections of this specification is not implied.
Electrical Characteristics
(VCC = 5V, TA = 25°C, Unless otherwise specified.)
Parameter
Symbol
Test Conditions
VCC Supply Current / Regulated Voltage
Nominal Supply Current
Regulated Voltage from BOOT
Power-On Reset
ICC UGATE, LGATE open
VCC
VBOOT = 12V
Rising VCC Threshold
VCC Threshold Hysteresis
Rising VOCSET Threshold
Reference
VOCSET = 4.5V
VOCSET1 = 4.5V
Reference Voltage
Oscillator
Free Running Frequency
Ramp Amplitude
Error Amplifier
∆ VOSC
DC gain
PWM Controller Gate Driver
Upper Drive Source
Upper Drive Sink
Lower Drive Source
Lower Drive Sink
RUGATE
RUGATE
RLGATE
RLGATE
BOOT= 12V
BOOT-VUGATE = 1V
VUGATE = 1V
VCC - VLGATE = 1V,
VLGATE = 1V
Min Typ Max Units
-- 3 6 mA
567 V
3.85 4.1 4.35
0.3 0.5 0.7
0.8 1.25 2.0
V
V
V
0.784 0.8 0.816 V
250 300 350 KHz
-- 1.75 -- VP-P
32 35 38 dB
-- 7 11 Ω
-- 5 7.5 Ω
-- 4 6 Ω
-- 2 4 Ω
To be continued
DS9202-02 August 2002
www.richtek.com
5
5 Page 
Applications Information
Inductor Selection
The RT9202 was designed for VIN = 5V, step-down
application mainly. Fig.5 shows the typical topology
and waveforms of step-down converter.
The ripple current of inductor can be calculated as
follows:
ILRIPPLE = (5V - VOUT)/L × TON
Because operation frequency is fixed at 300kHz,
TON = 3.33 × VOUT/5V
The VOUT ripple is
VOUT RIPPLE = ILRIPPLE × ESR
ESR is output capacitor equivalent series resistor
Table 1 shows the ripple voltage of VOUT: VIN = 5V
RT9202
Q
VI
L
VL
DC
R VO
C.C.M.
TS
TON TOFF
VI - VO
VL
- VO
iL µQ
µIL
IL = IO
iQ
IQ
iD
ID
Table 1
VOUT
Inductor
3.3V
2µH 5µH
2.5V
2µH 5µH
1000µF (ESR=53mΩ) 100mV 40mV 110mV 44mV
1500µF (ESR=33mΩ) 62mV 25mV 68mV 28mV
3000µF (ESR=21mΩ) 40mV 16mV 43mV 18mV
*Refer to Sanyo low ESR series (CE, DX, PX…)
The suggested L and C are as follows:
2µH with ≥ 1500µF COUT
5µH with ≥ 1000µF COUT
Fig.5
1.5V
2µH 5µH
93mV 37mV
58mV 23mV
37mV 15mV
DS9202-02 August 2002
www.richtek.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet RT9202.PDF ] | |
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