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PDF RT8856 Data sheet ( Hoja de datos )
| Número de pieza | RT8856 | |
| Descripción | Multi-Phase PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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RT8856
Multi-Phase PWM Controller f or CPU Core Power Supply
General D escription
Features
The RT8856 is a single/dual phase PWM controller with
two integrated MOSFETdrivers. Moreover, it is complai nt
with Intel IMVP6.5Voltage Regulator Specification to fuflill
its mobile CPU Vcore power supply requirements. The
RT8856 adopts NAVPTM (Native AVP) which is Richtek's
proprietary topology derived from f inite DC gain
compensator peak current mode, making it an easy setting
PWM controller that meets all Intel AVP (Active Voltage
Positioning) mobile CPU requirements.
The output voltage of the RT8856 is set by 7-bit VID code.
The built-in high a ccuracy DAC converts the VID code
ranging from 0Vto 1.5Vwith 12.5mVper step.The system
accuracy of the controller ca n rea ch 1.5%. The part
supports VID on-the-fly a nd mode cha nge on-the-fly
function s that are fully compli ant with IMVP6.5
specification. It operates in single phase, dual phase and
RFM. It can reach up to 90% eficiency in diferent modes
according to different loading conditions. The droop load
line can be easily programmed by setting the DC gain of
the error amplifier. With proper compensation, the load
transient can achieve optimized AVP performance. This
chip controls soft-start and output transition slew rate via
z 1/2 Pha se PWM Controller with 2 Integrated
MOSFET Drivers
z IMVP6.5 Compatible Power Management States
(DPSRLVR, PSI, Extended Deeper Sleep Mode)
z NAVP (Native AVP) Topology
z 7-bit DAC
z 0.8% DAC Accuracy
z Fixed VBOOT (1.1V)
z Differential Remote Voltage Sensing
z Programmable Output Transition Slew Rate Control
z Accurate Current and Thermal Balance
z System Thermal Compensation AVP
z Ringing Free Mode at Light Load Conditions
z Fast Transient Response
z Power Good
z Clock Enable Output
z Thermal Throttling
z Current Monitor Output
z Switching Frequency up to 1MHz Per Phase
z OVP, UVP, NVP, OCP, OTP, UVLO
z 40-Lead WQFN Package
z RoHS Compliant and Halogen Free
a capacitor. It supports both DCR a nd sen se re sistor
current sensing.The current modeNAVPTM topology with
high accuracy current sensing amplifier well balances the
RT8856's channel currents.
Ordering Information
RT8856
Package Type
QW : WQFN-40L 6x6 (W-Type)
The RT8856 provides power good, clock ena bling and
thermal throttling output signals for IMVP6.5 specification.
Lead Plating System
G : Green (Halogen Free and Pb Free)
It also features complete fault protection functions
Note :
including over voltage, under voltage, negative voltage, overRichtek products are :
current, thermal shutdown, and under voltage lockout.
` RoHS compliant and compatible with the current require-
The RT8856 is available in a WQFN-40L 6x6 small foot
print package.
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Application s
z IMVP6.5 Core Supply
z Multi-phase CPU Core Supply
z AVP Step-Down Converter
z Notebook/Desktop Computer/ Servers
Marking Information
RT8856GQW : Product Number
RT8856
GQW
YMDNN
YMDNN : Date Code
DS8856-03 June 201 1
www.richtek.com
1
http://www.Datasheet4U.com
1 page  
RT8856
Functional Pin Description
Pin No.
1 DP
Pin Name
RSLPVR
Pin Function
Deeper Sleep Mode Signal. Together with PSI, the combination o f these t wo pins
indicates the power management states.
2 VRON
Voltage Regulator Enabler.
3F S
Frequency Setting. Connect this pin with a resistor to ground to set the operating
frequency.
4C M
Current M onitor O utput. T his pin outputs a v oltage pr oportional to the output
current.
Current Monitor Output Gain Externally Setting. Connect this pin with o ne resistor
5C
MSET
to VSEN w hile CM pin is co nnected to g round w ith another r esistor. T he current
monitor output gain can be set by the ratio of these two resistors.
6 to 12 VID[6:0]
Voltage ID. DAC voltage identification inputs for IMVP6.5.
The logic threshold is 30% of VCCP as the maximum value for low state and 70%
13 PSI
of VCCP as the minimum value for the high state. VCCP is 1.05V.
Power Status Indicator II. Together with DPRSLPVR, the combination of these two
pins indicates the power management states.
14 COMP
Compensation. This pin is the output node of the error amplifier.
15 FB
16 VSE
N
Feedback. This is the negative input node of the error amplifier.
Positive Voltage Sensing Pin. T his p in i s t he p ositive node of t he differential
voltage sensing.
17 R
GND
Return G round. T his pin is th e negative n ode of th e d ifferential remote v oltage
sensing.
Soft-Start. T his p in pr ovides s oft-start function a nd s lew r ate control. T he
capacitance of t he slew rate control capacitor is restricted to be larger t han 10nF.
18 SO
FT
The feedback voltage of the converter follows the ramping voltage on the SOFT pin
during soft-start a nd o ther v oltage transitions a ccording to d ifferent modes o f
operation and VID change.
19 ISEN1
Positive Input of Phase1 Current Sense.
20 ISEN1_N Negative Input of Phase1 Current Sense.
21 B
OOT1
Bootstrap P ower P in of Phase1. This pin po wers t he high s ide M OSFET drivers.
Connect this pin to t he j unction of the bootstrap capacitor with the cathode of the
bootstrap diode. Connect the anode of the bootstrap diode to the PVCC pin.
22 UGATE1
23 PH
ASE1
Upper Gate Drive of Phase1. This pin drives the gate of the high side MOSFETs.
Return Node of Phase1 High Side Driver. Connect this pin to h igh side MOSFET
sources together with the low side MOSFET drains and the inductor.
24 PGND1 Driver Ground of Phase1.
25
LGATE1
Lower Gate Drive of Phase1. This pin drives the gate of the low side MOSFETs.
26 PVCC
Driver Power.
27
LGATE2
Lower Gate Drive of Phase2. This pin drives the gate of the low side MOSFETs.
28 PGND2 Driver Ground of Phase2.
29 PH
ASE2
Return N ode o f Phase2 High Side Driver. Connect this pin to high side MOSFET
sources together with the low side MOSFET drains and the inductor.
DS8856-03 June 201 1
To be continued
www.richtek.com
5
5 Page 
RT8856
Parameter Sy
LGATE Driver Sink Current
Internal Boost Charging Switch
On-Resistance
mbol
ILGATEsk
RBOOT
Test Conditions
VLGATE = 2.5V
PVCC to BOOTx
Min Typ Max Unit
-- 5 -- A
-- 30 -- Ω
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at the se or a ny other condition s beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may re main possibility to af fect device reli ability.
Note 2. θJA is me asured in n atural conve ction at TA = 25 °C on a high ef fective thermal conductivity f our-layer te st board of
JEDEC 51-7 thermal me asurement sta ndard. The me asured ca se position of θJC is on the exposed pa d of the
package.
Note 3. Devices are ESD sen sitive. Ha ndling pre caution is re commended.
Note 4. The device is not guara nteed to function outside its operating condition s.
DS8856-03 June 201 1
www.richtek.com
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet RT8856.PDF ] | |
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