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  Richtek Technology Electronic Components Datasheet  

RT9232A Datasheet

Programmable Frequency Synchronous Buck PWM Controller

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RT9232A pdf
RT9232A
Programmable Frequency Synchronous Buck PWM Controller
General Description
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The RT9232A is a single-phase synchronous buck PWM
DC-DC converter controller designed to drive twoN-Channel
MOSFET. It provides a highly accurate, programmable
output voltage precisely regulated to low voltage
requirement with an internal 0.8V ± 1% reference.
The RT9232A uses an external compensated, single
feedback loop voltage mode PWM control for fast transient
response. An oscillator with Programmable frequency
(50kHz to 800kHz) reduces the external inductor and
capacitor component size for saving PCB board area.
The RT9232A provides fast transient response to satisfy
high current output applications (up to 25A) while
minimizing external components. It is suitable for high-
performance graphic processors, DDR and VTT power.
The RT9232A integrates complete protect functions such
as Soft Start, Output Enable, UVLO(under-voltage lockout)
into a small 14-pin package.
Ordering Information
RT9232A
Package Type
S : SOP-14
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
RichTek Pb-free and Green 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.
DS9232A-02 March 2007
Features
Single IC Supply Voltage : 12V
Single phase DC/DC Buck Converter with
`High Output Current (up to 25A )
`Low Output Voltage (down to 0.8V )
`High Input Voltage (up to 12V )
Operate from 12V, 5V or 3.3V Input
0.8V ± 1% Internal Reference
Adaptive Non-Overlapping Gate Drivers
Integrated High-Current, HV Gate Drivers
External Programmable Soft Start
External Programmable Frequency
(Range : 50kHz to 800kHz, 200kHz Free Run )
Integrated Output Short Circuit Protection
On/Off Control by Enable Pin
Drives Two N-MOSFET
Full 0 to 100% Duty Cycle
Fast Transient Response
Voltage Mode PWM Control with External
Feedback Loop Compensation
RoHS Compliant and 100% Lead (Pb)-Free
Applications
System (Graphic, MB) with 12V Power.
Graphic Cards (AGP 8X, 4X, PCI Express*16):
High-Current for High-Performance Graphic Processors
(GPU, VPU)
Middle Current for High-Performance Graphic Memory
Power (DDR, DDR II)
Low Current with Sink Capacity for High-Performance
Graphic Memory Power (DDR/VTT)
3.3V ~ 12V Input DC-DC Regulators
Low Voltage Distributed Power Supplies
Pin Configurations
(TOP VIEW)
RT
SENSE
SS
COMP
FB
EN
GND
2
3
4
5
6
7
14 VCC
13 PVCC
12 LGATE
11 PGND
10 BOOT
9 UGATE
8 PHASE
SOP-14
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9232A Datasheet

Programmable Frequency Synchronous Buck PWM Controller

No Preview Available !

RT9232A pdf
RT9232A
Typical Application Circuit
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VCC
C1
0.22uF
R1
2.2
14 VCC
D1
1N4148
BOOT 10
C2
13
0.22uF
PVCC
SENSE 2
UGATE 9
CSS 0.1uF 3 SS
VCC
R3
10k
1
R2 RT
PHASE 8
51k 6 EN
LGATE 12
7 GND
PGND 11
4 COMP
FB 5
RT9232A
C11 33pF
R4
3.01k
VIN
3.3V - 12V
L1
1uH +CE0470uF
C3 1nF
C5 C6
0.1uF 10uF
CE1
1000uF
CE2
1000uF
R5
0
C4
0.1uF
Q1
IPD09N03LA
L2
2.2uH
R06 Q2
IPD06N03LA
2R.72
C7
1nF
CE3 CE4 C8 C9 C10
2200uF 510uF 22uF 10uF 0.1uF
VOUT
R9
1k
C12
10nF
R8
15k
R10
C13
10nF
R11
1k
562
Functional Pin Description
No Pin Name
1 RT
2 SENSE
3 SS
4 COMP
5 FB
6 EN
7 GND
8 PHASE
9 UGATE
10 BOOT
11 PGND
12 LGATE
13 PVCC
14 VCC
Pin Function
Oscillator Frequency Setting
Sense VIN Power Condition
Soft Start Time Interval Setting
Feedback Compensation
Voltage Feedback
Chip Enable (Active High)
IC Signal Reference Ground
Return Path for Upper MOSFET
Upper MOSFET Gate Drive
Input Supply for Upper Gate Drive
Power Ground
Lower MOSFET Gate Drive
Input Supply for Lower Gate Drive
Internal IC Supply (12V Bias)
www.richtek.com
2
DS9232A-02 March 2007


Part Number RT9232A
Description Programmable Frequency Synchronous Buck PWM Controller
Maker Richtek
Total Page 14 Pages
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