RT8857 데이터 시트보기 (PDF) - Richtek Technology
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RT8857
Richtek Technology
RT8857 Datasheet PDF : 26 Pages
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RT8857/A
Parameter
Symbol
Test Conditions
Reference Voltage accuracy
DAC Accuracy
1V to 1.6V
0.8V to 1V
0.5V to 0.8V
Error Amplifier
DC Gain
Gain-Bandwidth
Slew Rate
Output voltage range
Max Current
Power Sequence
ADC
GBW
SR
VCOMP
IEA_SLEW
No Load
CLOAD = 10pF
CLOAD = 10pF
Slew
PWRGD Low Voltage
Soft-Start Delay
VBOOT Duration
PWRGD Delay
Current Sense Amplifier
Max Current
Input Offset Voltage
Running Frequency
RT Pin Voltage
Ramp Slope
Soft Start
VPGOOD
TD1
TD3
TD5
IGM MA X
VOSCS
fOSC
VRT
VRAMP
IPWRGD = 4mA
Measured the time form VBOOT change
to PWRGD = 1
VCSP = 1.3V
Sink Current from CSN
RRT = 40kΩ
RRT = 40kΩ
RRT = 40kΩ
Soft Start Current
VID Change Current
Gate Driver
UGATE Drive Source
UGATE Drive Sink
LGATE Drive Source
LGATE Drive Sink
Protection
Over-Voltage Threshold
Over-Current Threshold
Dynamic Characteristic
ISS1
Slew
ISS2
Slew
RUGATEsr
RUGATEsk
RLGATEsr
RLGATEsk
BOOT − PHASE = 8V
250mA Source Current
BOOT − PHASE = 8V
250mA Sink Current
VLGATE = 8V
250mA Sink Current
VOVP
VOCP
Sweep FB Voltage, VFB − VEAP
Sweep IMAX Voltage, VIMAX − VADJ
UGATE Rise Time
UGATE Fall Time
LGATE Rise Time
LGATE Fall Time
trU GA TE
tfUGATE
trL GA TE
tfLGATE
Ciss = 3000p
www.richtek.com
16
Min
−0.5
−5
−8
--
--
10
0.5
300
--
--
--
--
100
−2
270
0.76
--
12
120
--
--
--
--
125
−10
--
--
--
--
Typ Max Unit
-- +0.5 %
--
+5 mV
--
+8 mV
80
-- dB
10
-- MHz
--
-- V/us
3.6 V
--
-- uA
--
0.4
V
2
-- ms
0.8 -- ms
1.6 -- ms
--
-- uA
0
+2 mV
300 330 kHz
0.8 0.84 V
22
-- %/V
16 20 uA
160 200 uA
1
--
Ω
1
--
Ω
1
--
Ω
0.8 --
Ω
150 175 mV
0 +10 mV
15
--
ns
10
--
ns
15
--
ns
10
--
ns
To be continued
DS8857/A-01 April 2011
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