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  Richtek Technology Electronic Components Datasheet  

RT8870A Datasheet

Dual-Output PWM Controller

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Preliminary
RT8870A
Dual-Output PWM Controller for AMD SVI Mobile CPU
Power Supply
General Description
The RT8870A is a dual-output PWM controller for AMD
SVI mobile CPU power supply. The RT8870A provides a
two-phase PWM controller to power the CPU Core (VDD)
and a single-phase PWM controller to power the
Northbridge portion of the CPU (VDDNB). This part has
three integrated MOSFET drivers and is fully compliant
with AMD Voltage Regulator Specification to meet AMD’s
mobile CPU power supply requirements.
The RT8870A features CCRCOT (Constant Current Ripple
Constant On-Time) control with G-NAVPTM (Green-Native
AVP), which is a Richtek proprietary topology. The
CCRCOT control provides superior output voltage ripple
performance over the entire input/output range. G-NAVPTM
makes this device an easy setting controller to meet the
droop requirement for all AMD mobile CPUs. The droop is
easily programmed by setting the DC gain of the error
amplifier. With proper compensation, the load transient
response can achieve optimized AVP performance. The
droop function is selectable for both VDD and VDDNB
outputs. The RT8870A uses Serial VID Interface (SVI) for
individual controller output voltage and operation mode
programming. A built-in high-accuracy DAC converts the
serial VID code for output voltage ranging from 0.5V to
1.55V with up to 0.8% system accuracy. This device
supports VID on-the-fly and operation mode transition on-
the-fly functions that are fully compliant with the AMD
specification. Both VDD and VDDNB controllers provide
diode emulation mode to improve efficiency at light load
condition.
The RT8870A supports inductor DCR and sense resistor
current sensing. It also provides power good indication
and complete fault protection functions, including over
voltage, out-of-spec, negative voltage, over current and
under voltage lockout thermal shutdown.
The RT8870A is available in a WQFN-40L 5x5 small
footprint package.
Features
Dual-Output PWM Controller for AMD CPU Core and
NB Power
G-NAVPTM (Green-Native AVP)
Constant Current Ripple Constant-On-Time
(CCRCOT) Control
Fast Line/Load Transient Response
Integrated MOSFET Drivers
0.8% DAC Accuracy
Serial VID Interface (SVI)
` Two-Wire Clock and Data Bus
` High Speed I2C
` 7-bit DAC : 0.5V to 1.55V with 12.5mV Step
Support Power Saving Mode (PSI_L)
` Phase Shedding and Diode Emulation in VDD
Output
` Diode Emulation in VDDNB Output
Support VFIX Mode
Selectable Droop Function
Differential Remote Voltage Sensing
Accurate Current Balance
Digital Soft-Start/ Soft-Shutdown for All Outputs
OVP, Out-Of-Spec, NVP, OCP, OTP and UVLO
40-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
AMD SVI Mobile CPU
Laptop Computer
Ordering Information
RT8870A
Package Type
QW : WQFN-40L 5x5 (W-Type)
Note :
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Richtek 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.
DS8870A-P00 July 2010
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8870A Datasheet

Dual-Output PWM Controller

No Preview Available !

RT8870A
Preliminary
Marking Information
RT8870A
GQW
YMDNN
RT8870AGQW : Product Number
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
40 39 38 37 36 35 34 33 32 31
RBIAS 1
30
EN 2
29
SVC 3
28
SVD 4
27
PWROK 5
GND
26
PGOOD 6
25
VFIX/DRPSEL 7
24
OCSET_NB 8
VCC 9
41
23
22
FB_NB 10
21
11 12 13 14 15 16 17 18 19 20
UGATE1
PHASE1
PGND1
LGATE1
PVCC
LGATE0
PGND0
PHASE0
UGATE0
BOOT0
WQFN-40L 5x5
www.richtek.com
2
DS8870A-P00 July 2010



Part Number RT8870A
Description Dual-Output PWM Controller
Maker Richtek
Total Page 3 Pages
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RT8870A Datasheet PDF





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