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  Richtek Technology Electronic Components Datasheet  

RT9226B Datasheet

Synchronous PWM Step-Down DC/DC Converter Controller

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Preliminary
RT9226B
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 regulator with shutdown
function can be 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 200kHz
operating frequency and high speed PWM control loop
with Synchronous N-Channel MOSFET driver provide
optimized compromise between efficiency, cost, and
response speed. Other features include output voltage
monitoring for power good indication and over voltage
protection.
Ordering Information
RT9226B
Package Type
S : SOP-14
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Note :
RichTek Pb-free 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 Synchronous N-Channel MOSFET Driver
z High Efficiency
z Fast Response with 200kHz Operating Frequency
z Adjustable Current Limit by Sensing MOSFET
RDS(ON), without Extra Current Sensing Resistor
z Shutdown Function
z Power Good Indication Output and Over-Voltage
Protection
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Low Cost CPU Power Supply
z Motherboard I/O Power Supply
z Add-On Card Power Supply
z DDR SDRAM Bus Terminator Power Supply
Pin Configurations
(TOP VIEW)
VSEN
OCSET
SS
FB
EN
GND
PGNDH
14
2 13
3 12
4 11
5 10
69
78
SOP-14
VCC
LGATE
PGNDL
BOOT
UGATE
PHASE
PGOOD
DS9226B-04 March 2005
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9226B Datasheet

Synchronous PWM Step-Down DC/DC Converter Controller

No Preview Available !

RT9226B
Typical Application Circuit
Preliminary
10
12V
11 1000pF
15V 1uF
Chip Enable
BOOT
14 VCC OCSET 2
2.4K
5 EN
UGATE 10
1uH
1uF 1000uF*2
VIN
5V
0.1uF
3
12
SS
PGNDL
PHASE 9
6 GND
LGATE 13
7 PGNDH
4
FB
8 PGOOD VSEN 1
RT9226B
910 1%
7uH
1N5817
1000uF*6
VOUT
1.25V/10A
510 1%
Power Good
10K 1%
C4, C5: Each 1000µF 6.3WV DC, Sanyo MV-GX or Equivalent.
L1: Core: Micrometals T50-52; Winding: 5 turns of 18 AWG.
L2: Core: Micrometals T60-52; Winding: 14 turns of 17 AWG.
Q1, Q2: PHB83N03LT, PHB95N03LT
Function Block Diagram
EN
SS
GND
FB
PGOOD
VSEN
10uA
4.5V
VREF
Error
Amplifier
+
-
Output
Voltage
Monitor
47K
Soft
Start
Power-on
Reset
+
+
-
PWM
Comparator
Control
Logic
Over Current
Cpmparator
-
+
200uA
Oscillator
Gate
Control
Logic
VCC
VCC
OCSET
PHASE
BOOT
UGATE
PHNDH
LGATE
PGNDL
www.richtek.com
2
DS9226B-04 March 2005


Part Number RT9226B
Description Synchronous PWM Step-Down DC/DC Converter Controller
Maker Richtek
PDF Download

RT9226B Datasheet PDF






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