RT9953 RICHTEK [Richtek Technology Corporation], RT9953 Datasheet - Page 8

• Manufacturer Part Number: RT9953
• Description: 4+1 CH Power Management IC
• Manufacturer: RICHTEK [Richtek Technology Corporation]

www.richtek.com
8
RT9953
Total Accuracy (Including load
regulation and line regulation)
Under Voltage Protection (CH1 to
CH5)
CH5 Current Limit
Protection Fault Delay
Oscillator
CH1,2,3,4 Operating Frequency
CH1 Maximum Duty Cycle (Step-Up)
CH2 Maximum Duty Cycle (Step-Up)
CH2 Maximum Duty Cycle
(Step-Down)
CH3 Maximum Duty Cycle
(Step-Down)
CH4 Maximum Duty Cycle
(Step-Down)
Feedback Regulation Voltage
Feedback Regulation Voltage @ FB1,
FB2, FB3, FB4, FB5
Power Switch
CH1 On Resistance of MOSFET
CH1 Current Limitation (Step-Up)
CH2 On Resistance of MOSFET
CH2 Current Limitation (Step-Down)
CH2 Current Limitation (Step-Up)
CH3 On Resistance of MOSFET
CH3 Current Limitation (Step-Down)
CH4 On Resistance of MOSFET
CH4 Current Limitation (Step-Down)
CH5 Dropout Voltage (LDO)
Protection
Over Voltage Protection of CH1, CH2
Step-Up, PVDD1 and PVDD2
Over Voltage Protection Hysteresis of
CH1, CH2 Step-Up, PVDD1 and
PVDD2
Parameter
Symbol
f
R
R
R
DS(ON)
R
DS(ON)
V
I
OSC
LIM
DS(ON)
DS(ON)
Dro p
V
V
V
V
V
P-MOSFET, PVDD1 = 3.3V
N-MOSFET, PVDD1 = 3.3V
P-MOSFET, PVDD2 = 3.3V
N-MOSFET, PVDD2 = 3.3V
P-MOSFET, PVDD3 = 3.3V
N-MOSFET, PVDD3 = 3.3V
P-MOSFET, PVDD4 = 3.3V
N-MOSFET, PVDD4 = 3.3V
2.2V ≦ PVDD5 ≦ 2.7V,
I
2.7V ≦ PVDD5 ≦ 5.5V,
I
FB Threshold
2.2V ≦ PVDD5 ≦ 2.7V
2.7V ≦ PVDD5 ≦ 5.5V
OUT
OUT
FB1
FB2
FB2
FB3
FB4
= 400mA
= 500mA
= 0.7V
= 0.7V
= 0.7V
= 0.7V
= 0.7V
Test Conditions
0.788
0.36
Min
900
5.7
0.4
0.5
80
80
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3
DS9953-02 April 2011
1000 1100
Typ
200
150
200
150
350
300
350
300
160
250
100
0.8
1.8
1.5
1.5
0.5
0.4
0.7
0.8
83
83
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3
3
6
To be continued
0.812
Max
6.25
0.44
1.05
1.05
100
100
100
250
200
250
200
400
400
400
400
320
400
86
86
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3
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Unit
kHz
m
m
m
m
mV
ms
%
%
%
%
%
%
V
A
A
A
A
A
V
V
V
A