APW8871 Datasheet, PDF (6/27 Pages) Anpec Electronics Coropration – DDR4 TOTAL POWER SOLUTION (VPP/VDDQ/VTT) SYNCHRONOUS DC/DC CONVERTER for NB/MB

APW8871
Electrical Characteristics
Ref er to the typical applic ation cir cuits . These s pecif ications apply over V =V =5V, V =19V and T = -40 ~ 85^oC, unless
VCC BOO T
IN
A
otherw ise specified. Typical values are at T =25oC.
A
Symbol
Parameter
Test Conditions
APW8871
Unit
Min Typ Max
VTTREF OUTPUT
V_VTTREF VTTREF Output Voltage
V_LDOIN = V _VDDQ = 1.2V, V_VDDQ/2
-
0.6
-
V
VTTREF Tolerance
I_VTTREF
I_VTTREF
IVTTREFDIS
VTTREF Source Current
VTTREF Sink Current
VTTREF Discharge Current
-10mA < I_VTTREF < 10mA, V_VDDQ/2 - V_VTTREF
VLDOIN = V VDDQ = 1.2V
V_VTTREF = 0V
VVTTREF = 1.2V
TA=25 ^oC, S3=S5=0V, VTTREF=0.5V
-12
-
+12 mV
-10 -20 -40 mA
10
20
40 mA
-
2
-
mA
VDDQ OUTPUT
V_VDDQ VDDQ Sense Voltage
VDDQ Regulation Voltage
Tolerance to SMBus Setting
VDDQ Initial Setting = 1.2V
T_A=25 ^oC
-
1.2
-
V
-3
-
3
mV
IVDDQ VDDQSNS Input Current
V _VDDQSNS=2V
-0.5
-
0.5 uA
VDDQSNS Discharge Current ^{VS3 = VS5 = 0V, VVDDQ = 0.5V, VDDQSNS to GND}
-
MOSFET turns on
12
25
mA
LDOIN Discharge Current
V_S3 = V_S5 = 0V, V_VDDQSNS = 0.5V, (Tracking)
-
700
-
mA
VDDQ PWM CONTROLLERS
F_{S W}
T_{SS_VDDQ}
Operating Frequency
Internal Soft Start Time
V_CC=4.5V~5.5V
V_VPP is High to V_VDDQ Regulation
720 800 880 kHz
0.3 0.4 0.5 ms
TOFF (MIN)
T_ON(MIN)
Minimum off time
Minimum on time
Zero-Crossing Threshold
Over all temperature and V_CC
200 300 400 ns
80 110 140 ns
-5 0.5
5
mV
VDDQ POWER MOSFET
RON_HS_VDDQ
High-Side N-MOSFET
Resistance
-
20
30
mΩ
RON_LS_VDDQ
Low-Side N-MOSFET
Resistance
-
10
15
mΩ
VDDQ PROTECTIONS
V_OCL
Current Limit Threshold
V _NOCL
Negative Current Limit
Threshold
Sensing Valley Current
11
12
13
A
-
-5
-
A
VDDQ OVP Trip Threshold
VDDQ OVP Debounce Delay
VDDQ UVP Trip Threshold
VDDQ UVP Debounce
V_VDDQ Rising
VVDDQ Rising, DV=10mV
V_VDDQ Falling
120 125 130
%
-
2
-
µs
55
60
65
%
-
2
-
µs
VDDQ UVP Enable Delay
From S5=H to POK goes high
-
0.7
-
ms
C opyright © ANPEC Electronics C orp.
6
Rev. A.1 - Sep., 2015
www.anpec.com.tw