RT8841
Parameter
Symbol
ADC
Test Conditions
Min
Typ
Max
Unit
Error Amplifier
DC Gain
No Load
--
--
80
10
--
--
--
dB
MHz
V/us
V
Gain-Bandwidth
Slew Rate
GBW
SR
CLOAD = 10pF
CLOAD = 10pF
10
0.5
--
Output voltage range
VCOMP
3.6
Max Current
IEA_SLEW
Slew
300
--
--
uA
Power Sequence
PWRGD Low Voltage
Soft-Start Delay
VPGOOD
TD1
IPWRGD = 4mA
--
--
--
--
2
0.4
--
V
ms
ms
VBOOT Duration
TD3
0.8
--
Measured the time form VBOOT change
to PWRGD = 1
PWRGD Delay
TD5
--
1.6
--
--
ms
Current Sense Amplifier
Max Current
VCSP = 1.3V
IGMMAX
100
--
uA
Sink Current from CSN
Input Offset Voltage
Running Frequency
RT Pin Voltage
Ramp Amplitude
Soft Start
VOSCS
fOSC
−1.5
270
1.52
--
0
1.5
330
1.68
--
mV
kHz
V
RRT = 40kΩ
RRT = 40kΩ
RRT = 40kΩ
300
1.60
1.60
VRT
VRAMP
V
Soft Start Current
VID change Current
Gate Driver
ISS1
ISS2
Slew
Slew
13
16
19
uA
uA
130
160
190
BOOT − PHASE = 8V
250mA Source Current
BOOT − PHASE = 8V
250mA Sink Current
VLGATE = 8V
UGATE Drive Source
UGATE Drive Sink
RUGATEsr
--
--
1
1
--
--
Ω
Ω
RUGATEsk
RLGATEsr
LGATE Drive Source
LGATE Drive Sink
Protection
--
--
1
--
--
Ω
Ω
RLGATEsk 250mA Sink Current
0.8
Over-Voltage Threshold
Over-Current Threshold
Dynamic Characteristic
UGATE Rise Time
UGATE Fall Time
VOVP
VOCP
Sweep FB Voltage, VFB,EAP
Sweep IMAX Voltage, VIMAX,ADJ
125
150
0
175
+13
mV
mV
−13
trUGATE
tfUGATE
trLGATE
tfLGATE
--
--
--
--
15
10
15
10
--
--
--
--
ns
ns
ns
ns
Ciss = 3000p
LGATE Rise Time
LGATE Fall Time
Input Threshold
VID7 to VID0,
VIDSEL Rising Threshold
VID7 to 0
VIDSEL
,
VID7 to VID0 Rising,
VIDSEL Rising
1/2VTT +
12.5mV
--
--
--
--
V
VID7 to
VID7 to VID0,
VIDSEL Hysteresis
VID7 to VID0 Falling,
VIDSEL Falling
25
mV
,
0_Hy
VIDSEL_Hy
www.richtek.com
20
DS8841-01 April 2011
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
