RT9921PQV 查看數據表（PDF） - Richtek Technology
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RT9921PQV Datasheet PDF : 15 Pages
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RT9921
Preliminary
Parameter
Symbol
Test Condition
Min
FREQ Input Low Voltage
--
FREQ Input High Voltage
FREQ Pull-down Current
Feedback Voltage
VFB
FB Input Bias Current
Transconductance of Error Amplifier Gm
Voltage Gain of Error Amplifier
AV
VFREQ = 1.0V
No Load
VFB = 1.5V
ICOMP = 5μA
0.7 x VIN
--
1 .228
−4 0
--
--
Feedback Voltage Line Regulation
VIN = 2.5 to 5.5V
--
LX ON-Resistance
RL X(O N)
--
LX Current Limit
ILIM
--
Current Sense Transresistance
--
Soft-Start Charge Current
IS S
--
Thermal Shutdown Temperature
TSD
--
Thermal Shutdown Hysteresis
ΔTSD
--
FB Fault Trip Level (UVP Level)
VFB Falling
--
FB Fault Delay (UVP Delay)
--
Low Dropout Linear Regulator (LDO)
Input Voltage
Dropout Voltage
Feedback Voltage
Current Limit
Quiescent Current
Line Regulation
Load Regulation
Gate Pulse Modulator
VLDOI
V DR OP
VADJ
ILIM
ILDO
VIN = 3.3V, IOUT = 350mA
http://www.DataSheet4U.net/
VIN = 2.8 to 5.5V,
IOUT = 100mA,
VLDO = 2.5V
IOUT = 1mA to 300mA
2.5
--
1 .224
35 0
--
--
--
VFLK Input High Voltage
VIH_FL K
1.5
VFLK Input Low Voltage
VIL FLK
--
Charge Current of VDPM Pin
I1
18
VGH Switch On-Resistance
RP1
--
RE Switch On-Resistance
RN 2
--
Voltage Detector
Minimum Operating Voltage
1 .6
Detecting Voltage Adjustment
VDIV
--
Detecting Voltage Accuracy
−2%
Adjustable Delay Time-Constant k
tD = k(Ω)*CD(F)
--
Typ
--
--
4
1 .240
--
16 0
70 0
− 0.1
20 0
2.0
0.5
4
17 0
20
1 .05
16 0
--
450
1. 240
500
90
0 .1
0 .2
--
--
20
30
25
--
1. 1
--
120 k
M ax
0.3 x VIN
--
--
1 .252
+4 0
--
--
--
50 0
--
--
--
--
--
--
--
5. 5
500
1.2 56
--
--
0. 3
0. 5
--
0. 6
22
--
--
--
--
2%
--
Units
V
V
μA
V
nA
μA/V
V/V
%/V
mΩ
A
A/V
μA
°C
°C
V
ms
V
mV
V
mA
μA
%/V
%
V
V
μA
Ω
Ω
V
V
%
Ω
www.richtek.com
6
To be continued
DS9921-00 November 2007
datasheet pdf - http://www.DataSheet4U.net/
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