RT8841 Datasheet, PDF (20/32 Pages) Richtek Technology Corporation – 4/3/2/1-Phase PWM Controller for High-Density Power Supply

RT8841
Parameter
Error Amplifier
DC Gain
Gain-Bandwidth
Slew Rate
Output voltage range
Max Current
Power Sequence
PWRGD Low Voltage
Soft-Start Delay
V_BOOT Duration
PWRGD Delay
Current Sense Amplifier
Max Current
Input Offset Voltage
Running Frequency
RT Pin Voltage
Ramp Amplitude
Soft Start
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
UGATE Rise Time
UGATE Fall Time
LGATE Rise Time
LGATE Fall Time
Input Threshold
VID7 to VID0,
VIDSEL Rising Threshold
VID7 to VID0,
VIDSEL Hysteresis
Symbol
A_DC
GBW
SR
V_COMP
I_{EA_SLEW}
V_PGOOD
T_{D 1}
T_{D 3}
T_{D 5}
I_{GM MA X}
V_OSCS
f_OSC
V_RT
V_RAMP
I_SS1
I_SS2
R_UGATEsr
R_UGATEsk
R_LGATEsr
R_LGATEsk
V_OVP
V_OCP
t_rUGATE
t_fUGATE
t_{rL GA TE}
t_fLGATE
V_{ID7 to 0},
V_IDSEL
V_{ID7 to}
0_Hy^,
V_{IDSEL_Hy}
Test Conditions
No Load
C_LOAD = 10pF
C_LOAD = 10pF
Slew
Min Typ Max
--
80
--
--
10
--
10
--
--
0.5
3.6
300
--
--
I_PWRGD = 4mA
--
--
--
Measured the time form V_BOOT change _--
to PWRGD = 1
--
0.4
2
--
0.8
--
1.6
--
V_CSP = 1.3V
Sink Current from CSN
R_RT = 40kΩ
R_RT = 40kΩ
R_RT = 40kΩ
Slew
Slew
100
--
--
−1.5
0
1.5
270 300 330
1.52 1.60 1.68
--
1.60
--
13
16
19
130 160 190
BOOT − PHASE = 8V
250mA Source Current
BOOT − PHASE = 8V
250mA Sink Current
V_LGATE = 8V
250mA Sink Current
--
1
--
--
1
--
--
1
--
--
0.8
--
Sweep FB Voltage, V_FB,EAP
Sweep IMAX Voltage, V_IMAX,ADJ
Ciss = 3000p
125 150 175
−13
0
+13
--
15
--
--
10
--
--
15
--
--
10
--
VID7 to VID0 Rising,
VIDSEL Rising
VID7 to VID0 Falling,
VIDSEL Falling
-- ^{1/2VTT +} --
12.5mV
--
25
--
Unit
dB
MHz
V/us
V
uA
V
ms
ms
ms
uA
mV
kHz
V
V
uA
uA
Ω
Ω
Ω
Ω
mV
mV
ns
ns
ns
ns
V
mV
www.richtek.com
20
DS8841-01 April 2011