APW8871 Datasheet, PDF (14/27 Pages) Anpec Electronics Coropration – DDR4 TOTAL POWER SOLUTION (VPP/VDDQ/VTT) SYNCHRONOUS DC/DC CONVERTER for NB/MB

APW8871
Block Diagram
VDDQSNS
0.5 x VDDQSNS
S3
S5
SMC
SMD
PMAX
Thermal
Shutdown
S3,S5 Control
Logic
SMBus Interface
80% of VDDQ
Current Limit
REFIN
VDDQ DAC
Control
VIN
VIN
Error
125% x REFINComparator
OV
Current Limit
Discharge
Level
Sensing
Current
Limit
FB2
POK
AGND
60% x REFIN
L X1
UV
ZC
REFIN x 125%
TON
Generator
VDDQ
PWM
Signal
Controller
VCC
VREF=0.6V
REFIN x 90%
Error
125% x VREF _Comparator
OV
Current Limit
PVCC
60% x VREF
LX2
UV
ZC
Delay
TON
Generator
VREF x 125%
VPP
PWM
Signal
Controller
VCC
VREF x 90%
C opyright © ANPEC Electronics C orp.
14
Rev. A.1 - Sep., 2015
VTTREF
VLDOIN
VTT
VTTSNS
POR
Soft
Start
VCC
BOOT
VIN
L X1
PVCC
LX2
PGND
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