RT8856 데이터 시트보기 (PDF) - Richtek Technology
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RT8856 Datasheet PDF : 23 Pages
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RT8856
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Current Limit Threshold Voltage
(Average)
Current Limit Threshold Voltage
(per phase)
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Logic Inputs
VILIM
VILIM_PH
TSD
ΔTSD
Σ (VISENx − VISENx_N) / N,
VOCSET = 0.625V,
VILIMT(nom) = 25mV
VILIMITPH / VILIMIT
23 25 27 mV
-- 150 --
%
-- 160 -- °C
-- 10 -- °C
VRON Input Threshold Logic-High VIH
Voltage
Logic-Low VIL
Leakage Current of VRON
DAC (VID0 − VID6),
Logic-High VIH
PSI and DPRSLPVR
Input Threshold Voltage Logic-Low VIL
Leakage Current of DAC (VID0 −
VID6), PSI and DPRSLPVR
With respect to 3.3V, 70%
With respect to 3.3V, 30%
With respect to 1.1V, 70%
With respect to 1.1V, 30%
2.31 --
--
V
--
-- 0.99
−1 --
1 μA
0.77 --
--
V
--
-- 0.33
−1 --
1 μA
Power Good
PGOOD Threshold
PGOOD Low Voltage
PGOOD Delay
VTH_PGOOD
--
1
--
V
VPGOOD
IPGOOD = 4mA
--
-- 0.4 V
tPGOOD
CLKEN Low to PGOOD High
3
-- 20 ms
Clock Enable
CLKEN Low Voltage
Thermal Throttling
Thermal Throttling Threshold
Thermal Throttling Threshold
Hysteresis
VRTT Output Voltage
Current Monitor
VCLKEN
VOT
VOT_HY
VVRTT
ICLKEN = 4mA
--
-- 0.4 V
Measure at NTC with respect
to VCC
--
At VCC = 5V
--
IVRTT = 40mA
--
80
-- %VDD
100 -- mV
-- 0.4 V
Current Monitor Maximum Output
Voltage in Operating Range
Current Monitor Maximum Output
Voltage
Gate Driver
VDAC = 1V, VRCMSET = 90mV,
RCM = 50kΩ, RCMSET = 10kΩ
0.855
0.9
0.945
V
--
-- 1.15 V
UGATE Driver Source
RUGATEsr
UGATE Driver Sink
RUGATEsk
LGATE Driver Source
RLGATEsr
LGATE Driver Sink
RLGATEsk
UGATE Driver Source/Sink Current IUGATE
LGATE Driver Source Current
ILGATEsr
VBOOTx − VPHASEx = 5V
VBOOTx − VUGATEx = 1V
VUGATE = 1V
VPVCC = 5V,
VPVCC − VLGATE = 1V
VLGATE = 1V
VBOOT − VPHASE = 5V
VUGATE = 2.5V
VLGATE = 2.5V
-- 0.7 --
Ω
-- 0.6 --
Ω
-- 0.7 --
Ω
-- 0.3 --
Ω
--
3
--
A
--
3
--
A
www.richtek.com
10
To be continued
DS8856-03 June 2011
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