rt9226b ETC-unknow, rt9226b Datasheet

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rt9226b

Manufacturer Part Number
rt9226b
Description
Synchronous Pwm Step-down Dc/dc Converter Controller
Manufacturer
ETC-unknow
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
rt9226bCS
Manufacturer:
RICHTEK/立錡
Quantity:
20 000
General Description
The RT9226B is a low cost, high-efficiency voltage-
mode PWM controller for motherboard power supply
application. Synchronous N-channel MOSFET driver,
short-circuit protection, and soft start function are
integrated in a single chip. A simple high power buck
regulator
implemented with minimum external components.
The RT9226B 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 Synchronous N-
channel
compromise between efficiency, cost, and response
speed.
monitoring for power good indication and over
voltage protection.
Ordering Information
RT9226B
DS9226B-01 May 2001
Synchronous PWM Step-down DC/DC Converter Controller
Other
MOSFET
with
Package type
S : SOP-14
Operating temperature range
C: Commercial standard
features
shutdown
driver
include
function
provide
output
optimized
can
voltage
Preliminary
be
Features
Applications
Pin Configurations
RT9226BCS
(Plastic SOP-14)
Part Number
Low Cost CPU Power Supply
Motherboard I/O Power Supply
Add-On Card Power Supply
DDR SDRAM Bus Terminator Power Supply
Synchronous N-channel MOSFET Driver
High Efficiency
Fast
Frequency
Adjustable Current Limit by Sensing MOSFET
R
Resistor
Shutdown Function
Power Good Indication Output and Over-
voltage Protection
DS(ON)
Response
,
without
PGNDH
OCSET
VSEN
with
GND
Extra
Pin Configurations
EN
SS
FB
1
2
3
4
5
6
7
TOP VIEW
200kHz
www.richtek-ic.com.tw
Current
RT9226B
14
13
12
11
10
9
8
Operating
VCC
LGATE
PGNDL
BOOT
UGATE
PHASE
PGOOD
Sensing
1

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rt9226b Summary of contents

Page 1

... Synchronous PWM Step-down DC/DC Converter Controller General Description The RT9226B is a low cost, high-efficiency voltage- mode PWM controller for motherboard power supply application. Synchronous N-channel MOSFET driver, short-circuit protection, and soft start function are integrated in a single chip. A simple high power buck ...

Page 2

... RT9226B Absolute Maximum Ratings Supply Voltage Input, Output or I/O Voltage Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Package Thermal Resistance SOP-14, θ JA Lead Temperature (Soldering, 10 sec.) Electrical Characteristics (VCC = 12V, GND = 0V 25°C, unless otherwise specified) A Parameter VCC Supply Current ...

Page 3

... Low Side Driver Output 14 VCC Power Supply Input DS9226B-01 May 2001 Preliminary Power-on Over Current Reset Comparator Soft Start Control Logic Error PWM _ Amp Comparator Gate Oscillator Control _ Logic RT9226B VCC OCSET 200µA _ PHASE BOOT UGATE PGNDH V CC LGATE PGNDL www.richtek-ic.com.tw 3 ...

Page 4

... VCC OCSET 2. UGATE PHASE PGNDL 6 13 GND LGATE PGNDH PGOOD VSEN RT9226B R3 R4 510 1% 910 1% R5 10K 1µ 1000µF×2 1µ OUT 7µH + 1.25V/10A 1000µF×6 1N5817 ...

Page 5

... Dimensions In Millimeters Min Max 8.534 8.738 3.810 3.988 1.346 1.753 0.330 0.508 1.194 1.346 0.178 0.254 0.102 0.254 5.791 6.198 0.406 1.270 RT9226B Dimensions In Inches Min Max 0.336 0.344 0.150 0.157 0.053 0.069 0.013 0.020 0.047 0.053 0.007 0.010 0.004 ...

Page 6

... RT9226B RICHTEK TECHNOLOGY CORP. Headquarter 6F, No. 35, Hsintai Road, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5510047 Fax: (8863)5537749 www.richtek-ic.com.tw 6 Preliminary RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek-ic.com.tw ...

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