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RT9902 Datasheet(PDF) 8 Page - Richtek Technology Corporation

Part # RT9902
Description  4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down
PDF  21 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9902 Datasheet(HTML) 8 Page - Richtek Technology Corporation

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RT9902
Preliminary
8
DS9902-10 August 2007
www.richtek.com
Parameter
Symbol
Test Condition
Min
Typ
Max
Units
Oscillator
Operation Frequency Range
FOSC
RT Open
475
550
625
kHz
CH1 Maximum Duty Cycle
DMAX1
--
85
90
%
CH2 Maximum Duty Cycle
DMAX2
--
--
100
%
CH3 Maximum Duty Cycle
DMAX3
--
--
100
%
Feedback Voltage (CH1, CH2, CH3, CH4)
Feedback Voltage
VFB
CH1, CH2, CH3
0.788
0.8
0.812
V
Feedback Voltage
(Charge Pump) VCPFB
CH4
0.78
0.8
0.82
V
Feedback Voltage
︱Δ
VFB︱
CH1, CH2, CH3, CH4
3.0V < VDDM < 5.5V
--
--
12
mV
Error Amplifier
GM
--
0.2
--
ms
Compensation Source Current
--
22
--
μA
Compensation Sink Current
--
22
--
μA
Power Switch
CH1 On Resistance of MOSFET
RDS(ON)
N-MOSFET
--
300
400
mΩ
CH1 Current Limitation
VVDD1 = 3.3V
2
2.6
3
A
N-MOSFET, VVDD2 = 3.3V
--
350
450
mΩ
CH2 On Resistance of MOSFET
RDS(ON)
P-MOSFET, VVDD2 = 3.3V
--
350
450
mΩ
CH2 Current Limitation
VVDD2 = 3.3V
1.3
1.5
1.9
A
N-MOSFET, VVDD3 = 3.3V
--
350
450
mΩ
CH3 On Resistance of MOSFET
RDS(ON)
P-MOSFET, VVDD3 = 3.3V
--
350
450
mΩ
CH3 Current Limitation
VVDD3 = 3.3V
1.3
1.5
1.9
A
Linear Controller
Feedback Voltage for Linear
Controller
VLFB
0.774
0.79
0.806
V
LDO_O pin Sink Current
VLDO_O = 1V
110
150
--
μA
UVP (CH2, CH3) & Over Voltage Protection (CH2)
UVP Threshold Voltage @FB2, FB3
0.3
0.4
0.5
V
Over Voltage Protection @FB2
0.95
1
--
V
Control
ENM, EN1, EN2, EN3 Input High
Level Threshold
VVDDM = 3.3V
--
0.8
1.3
V
ENM, EN1, EN2, EN3 Input Low
Level Threshold
VVDDM = 3.3V
0.4
0.8
--
V
Thermal Protection
Thermal Shutdown
TSD
140
180
--
°C
Thermal Shutdown Hysteresis
Δ
TSD
--
10
--
°C



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