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PDF RT8809B Data sheet ( Hoja de datos )
| Número de pieza | RT8809B | |
| Descripción | Multi-Phase PWM Controller | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8809B (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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SacPower
RT8809A/B
Multi-Phase PWM Controller for GPU Core Power Supply
General Description
The RT8809A/B is a dual-phase synchronous buck PWM
controller with integrated drivers which are optimized for
high performance graphic microprocessor and computer
applications. The IC integrates a G-NAVPTM PWM
controller, two 12V MOSFET drivers with internal bootstrap
diodes, as well as output current monitoring and protection
functions into the WQFN-24L 4x4 package. The
RT8809A/B adopts DCR and RDS(ON) current sensing. Load
line voltage positioning (droop) and over current protection
are accomplished through continuous inductor DCR current
sensing, while RDS(ON) current sensing is used for accurate
channel current balance. Using both methods of current
sampling utilizes the best advantages of each technique.
The RT8809A/B also features a one-bit VID control
operation in which the feedback voltage is regulated and
tracks external input reference voltage. Other features
include, adjustable operating frequency, external
compensation, and enable/shutdown functions.
Ordering Information
RT8809A/B
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
Note :
A : With Droop Function
B : Without Droop Function
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.
Features
z Dual-Phase PWM Controller
z Two Embedded MOSFET Drivers and Embedded
Switching Boot Diode
z Green-NAVPTM (Green Native Adaptive Voltage
Positioning) Topology
z Dynamic Auto Phase Control with Programmable
Threshold
z Cross-talk Jitter Suspend (CJSTM)
z Remote GND Detection for High Accuracy
z Automatic Diode Emulation Mode/Or Ultrasonic
Mode at Light Load
z Lossless RDS(ON) Current Sensing for Current Balance
z Lossless DCR Current Sensing for AVP & OCP
z Reference Voltage Output with 1% Accuracy
z External Reference Input with Soft-Start (RISS)
z Embedded One-Bit VID Control
z Programmable OCP Threshold
z Programmable Switching Frequency
z Reference Tracking UVP/OVP Protection
z Shoot Through Protection and Short Pulse Free
Technology
z RoHS Compliant and Halogen Free
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
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
VSET 1
18 VCC
VREF 2
17 VDD
EN/MSEL 3
RMPSET 4
PGND
16 LGATE1
15 PHASE1
COMP 5
FB 6
25 14 UGATE1
13 BOOT1
7 8 9 10 11 12
0755-83983280
WQFN-24L 4x4
1
1 page  
RT8809B (Without Droop Function)
VID RSET
VREF
RT8809A/B
VCC
VSET
RMPSET
VRTN
FB
COMP
EN/MSEL
TON
PS
CSP
CSN
OCP
Reference
Output Gen.
Internal
Regulator&BG
UV Trip Point
OV Trip Point
+
-
+
-
Power On Reset
& Central Logic
Control & Protection Logic
Soft-Start
VSETA
+
-
ERROR
AMP
++ +
LPF
+
+
+
Ramp
Gen
+
-PWM
CMP
EN/Mode
Select
To driver Logic
ZCD
To Power on
Reset
PHASE1 To driver Logic
To Power
on Reset
VIN
Detection
TON
Gen 1
TON
Gen 2
Boot-Phase
Detection 1
Boot-Phase
Detection 2
PWM1
Driver
Logic
PWM2
Phase
APS shedding
+
-
IsumAOC
OCP
Current
Balance
++
1/2 +
To Protection Logic
S/H
S/H
GM-
+
-
GM
+
VDD
BOOT1
UGATE1
PHASE1
LGATE1
BOOT2
UGATE2
PHASE2
LGATE2
PGND
5
5 Page 
RT8809A/B
VSET
(1V/Div)
Dynamic Output Voltage Control
RT8809B, VSET = 0.78V to 1.15V, IOUT = 40A
VOUT
(1V/Div)
UGATE1
(50V/Div)
UGATE2
(50V/Div)
Time (200μs/Div)
VSET
(1V/Div)
Dynamic Output Voltage Control
RT8809A, VSET = 1.15V to 0.78V, IOUT = 40A
VOUT
(1V/Div)
UGATE1
(50V/Div)
UGATE2
(50V/Div)
Time (40μs/Div)
VSET
(1V/Div)
Dynamic Output Voltage Control
RT8809B, VSET = 1.15V to 0.78V, IOUT = 40A
VOUT
(500mV/Div)
VOUT
(1V/Div)
UGATE1
(50V/Div)
UGATE2
(50V/Div)
Time (200μs/Div)
IOUT
(50A/Div)
UGATE1
(50V/Div)
UGATE2
(50V/Div)
Load Transient Response
RT8809A, VIN = VCC = 12V, RLL = 1.5mΩ
Time (10μs/Div)
VOUT
(500mV/Div)
IOUT
(50A/Div)
UGATE1
(50V/Div)
UGATE2
(50V/Div)
Load Transient Response
RT8809B, VIN = VCC = 12V
VOUT
(500mV/Div)
Time (10μs/Div)
IOUT
(50A/Div)
UGATE1
(50V/Div)
UGATE2
(50V/Div)
Load Transient Response
RT8809A, VIN = VCC = 12V, RLL = 1.5mΩ
Time (10μs/Div)
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet RT8809B.PDF ] | |
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