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  Richtek Technology Electronic Components Datasheet  

RT9226 Datasheet

PWM Step-down DC/DC Converter Controller

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RT9226
March, 2000
PWM Step-down DC/DC Converter Controller
General Description
Features
The RT9226 is a low cost, high-efficiency
voltage-mode PWM controller for motherboard
power supply application. High-side N-channel
MOSFET driver, short-circuit protection, and soft
start function are integrated in a single chip. A
simple high power buck regulator with shutdown
function can be implemented with minimum
external components.
The RT9226 provides current-limit protection by
monitoring the voltage drop across N-channel
MOSFET in over current condition, therefore,
eliminates the current sensing resistor and
minimizes the efficiency loss. The soft start
function reduces the stress on power supply and
components in power on duration. The 200 kHz
operating frequency and high speed PWM control
loop with high-side N-channel MOSFET driver
provide optimized compromise between
efficiency, cost, and response speed.
l Low cost and small size
l High efficiency
l Fast response with 200kHz operating frequency
l Adjustable current limit by sensing MOSFET
rDS(ON), without extra current sensing resistor
l Shutdown function
Applications
l Low cost CPU power supply
l Motherboard I/O power supply
l Add-on card power supply
Ordering Information
RT9226-oo
Pin Configurations
Part Number
Pin Configuration
Package type
S: SOP-14
Operation temperature range
C: Commercial standard
RT9226CS
(Plastic SOP-14)
TOP VIEW
RT 1
14 VCC
OCSET 2
13 NC
SS 3
12 NC
NC 4
11 NC
FB 5
10 BOOT
EN 6
9 UGATE
GND 7
8 PHASE
RichTek Technology Corp.
6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C.
-- 1 / 6 --
DS9226-01
Tel: (8863)5510047 Fax: (8863)5537749


  Richtek Technology Electronic Components Datasheet  

RT9226 Datasheet

PWM Step-down DC/DC Converter Controller

No Preview Available !

Absolute Maximum Ratings
l Supply Voltage (VCC)
l Input, Output or I/O Voltage
l Ambient Temperature Range(TA)
l Operating Junction Temperature Range (TJ)
l Storage Temperature Range (TSTG)
l Power Dissipation and Thermal Characteristics:
l SOP Plastic Package, PD @ TA=25
l Thermal Resistance, R JA
l Lead Temperature (Soldering) 10 seconds (TLEAD)
Electrical Characteristics
Vcc=12V, GND=0V, TA=25 , unless other wise specified.
Parameter
Symbol
Test condition
VCC Supply Current
Nominal Supply Current
Power-on Reset
ICC
UGATE Open
VCC Rising Threshold
VCC Falling Threshold
Enable Input Threshold
VOCSET = 4.5V
VOCSET = 4.5V
Oscillator
Frequency
Ramp Amplitude
Internal Voltage Reference
Reference Voltage
VREF
PWM Controller Error Amplifier
DC Gain
PWM Controller Gate Driver
UGATE Source
UGATE Sink
Protection
RUGATE
RUGATE
IUGATE = 0.3A
IUGATE = 0.3A
OCSET Sink Current
SS Current
IOCSET
ISS
VOCSET = 4.5V
VSS = 1.5V
RT9226
March, 2000
15V
GND–0.3V to Vcc+0.3V
0 to 70
0 to 125
65 to 150
0.625W
160 /W
260
Min Typ Max Units
-- 3 -- mA
-- 9.5 --
-- 7.5 --
0.2 -- 2.2
V
V
V
170 200 230 kHz
-- 1.9 --
--
1.225 1.250 1.275 V
-- 65 -- dB
-- 8 --
-- 6 --
170 200 230
-- 10 --
µA
µA
RichTek Technology Corp.
6F, No. 35, Hsintai Road, Chupei City, Hsinchu, Taiwan, R.O.C.
-- 2 / 6 --
DS9226-01
Tel: (8863)5510047 Fax: (8863)5537749


Part Number RT9226
Description PWM Step-down DC/DC Converter Controller
Maker Richtek
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RT9226 Datasheet PDF






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