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  Richtek Technology Electronic Components Datasheet  

RT9258 Datasheet

Two Phases Synchronous Buck PWM Controller

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RT9258
Two Phases Synchronous Buck PWM Controller
General Description
The RT9258 is a two phases synchronous Buck PWM
controller with integrated drivers which is optimized for
high-performance graphic microprocessor and computer
applications. The IC integrates a voltage mode PWM
controller, two 5V MOSFET drivers with internal bootstrap
diodes, as well as output current monitoring and protection
functions into a WQFN-24L 4x4 package.
The inductor currents are sensed by lossless DCR current
sensing technique for current balance and over current
protection. The RT9258 also features a reference tracking
mode operation in which the feedback voltage is regulated
and tracks external input reference voltage. Other features
include output current indication, adjustable operating
frequency, adjustable soft-start, power good, external
compensation, and enable/shutdown functions.
Applications
z Middle to High End GPU Core Power
z High End Desktop PC Memory Core Power
z Low Voltage, High Current DC / DC Converter
z Voltage Regulator Modules
Ordering Information
RT9258
Package Type
QW : WQFN-24L 4x4 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Richtek 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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
z Two-Phase Power Conversion with Single 12V
Power Supply
z Embedded 5V Upper Gate Driver and 12V Lower
Gate Driver
z Internal Regulated 5V Output
z Precise Core Voltage Regulation
z Selectable Internal / External Reference
z Differential Inductor DCR Current Sense
z External Programmable Voltage Droop Control
z Enable Control for External Shutdown
z Adjustable Operating Frequency
z Adjustable Soft Start
z Power Good and Output Current Indication
z Adjustable Over Current Protection
z Over Voltage Protection
z Under Voltage Protection
z Over Temperature Protection
z RoHS Compliant and Halogen Free
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
PHASE2 1
18 COMP
LGATE2
DROOP
VCC
2
3
4
PGND
17 RT
16 IOUT/IMAX
15 CSP2
LGATE1 5
PHASE1 6
14 CSN2
25 13 CSN1
7 8 9 10 11 12
WQFN-24L 4x4
DS9258-01 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9258 Datasheet

Two Phases Synchronous Buck PWM Controller

No Preview Available !

RT9258
Typical Application Circuit
EXT_12V
VCC
12V
EXT_12V
DET
EXT_12V_DETB
Circuits
Internal Reference mode
5VCC
Optional
External Reference
Voltage (0.45 to 2.5V)
R2
R3
C1
C2
C3
R4
R1
RT9258
11 EN2B
BOOT1 8
R14
22
REFOUT/
PGOOD
UGATE1
7
4 VCC
9 5VCC
21 REFIN/
PHASE1 6
LGATE1 5
EN
10 AGND
20 SS
BOOT2 23 R15
17 RT
UGATE2 24
Q1
Q2
C9
Optional
R5
R6 C4
C5
16 IOUT/
IMAX
18 COMP
R7
R16
C18
19 FB
R8
3 DROOP
R9
PHASE2 1
LGATE2 2
CSN2 14
CSN1 13
CSP2 15
CSP1 12
R10
R11
C16
C6 C7
EXT_12V
C8 /VCC12V
L1
C12
C10 C11
Q3
L2
Q4 C14
R12
R13
C17
PHASE2
PHASE1
VOUT
C13
C15
Figure 1. Typical Application Circuit with 12V Input
www.richtek.com
2
DS9258-01 April 2011


Part Number RT9258
Description Two Phases Synchronous Buck PWM Controller
Maker Richtek Technology
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RT9258 Datasheet PDF






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