RT9986 RICHTEK [Richtek Technology Corporation], RT9986 Datasheet - Page 9

• Manufacturer Part Number: RT9986
• Description: 7-CH DC/DC Converter for DSC
• Manufacturer: RICHTEK [Richtek Technology Corporation]

DS9986-00 May 2011
CH4 Synchronous Step-Down
Supply Current into VDDM
CH5 Synchronous Step-Up Supply
Current into VDDM
CH6 (Inverting)
Supply Current into VDDM
CH7 (WLED) in Step-Up Mode
Supply Current into VDDM
CH7 (WLED) in Current Source
Mode Supply Current into VDDM
Oscillator
CH1, 2, 3, 4 Operation Frequency
CH5, 6, 7 Operation 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)
CH5 Maximum Duty Cycle (Step-Up)
CH6 Maximum Duty Cycle (Inverting)
CH7 Maximum Duty Cycle (Step-Up)
Feedback, Regulation Voltage
Feedback Regulation Voltage @
FB1, FB2, FB3, FB4
Feedback Regulation Voltage @ FB5 V
Feedback Regulation Voltage @ FB6
(Inverting)
Feedback Regulation Voltage @ FB7 V
Output Current (CS Mode)
Dropout Voltage @ FB7 (CS Mode)
VREF Output Voltage
VREF Load Regulation
Power Switch
CH1 On-Resistance
CH1 Current Limitation (Step-Up)
CH2 On Resistance
CH2 Current Limitation (Step-Down)
CH2 Current Limitation (Step-Up)
Parameter
P-MOSFET
N-MOSFET
P-MOSFET
N-MOSFET
I
I
I
I
I
f
f
V
V
R
I
R
I
I
Q4
Q5
Q6
Q7b
Q7c
OSC
OSC2
LIM1
LIM2_D
LIM2_U
Symbol
FB5
FB6
FB7
REF
DS(ON)1
DS(ON)2
Non switching, V
Non switching, V
Non switching, V
Non switching, V
V
CH7 in Step-Up mode
V
V
V
V
V
V
V
V
V
0μA < I
V
V
V
V
EN7
FB1
FB2
FB2
FB3
FB4
FB5
FB6
FB7
LX7
PVDD1
PVDD1
PVDD2
PVDD2
= 0V
= 0.75V
= 0.75V
= 0.75V
= 0.75V
= 0.75V
= 1.15V
= 0.7V
= 0.15V
= 3.3V, V
Test Conditions
REF
= 3.3V
= 3.3V
= 3.3V
= 3.3V
< 200μA
LX7
EN1234
EN56
EN56
EN7
= 0V
= 3.3V
= 3.3V
= 3.3V
= 3.3V
0.788
1.237
0.237
1.782
1800
0.59
28.5
Min
900
2.2
1.2
2.2
80
80
91
91
91
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--
--
--
--
--
--
--
--
--
--
--
--
--
2000
1000
1.25
0.25
Typ
200
150
200
150
0.8
0.6
1.8
1.6
83
83
93
93
93
30
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--
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3
3
RT9986
To be continued
www.richtek.com
0.812
1.263
0.263
1.818
2200
1100
Max
0.61
31.5
800
800
800
800
800
100
100
100
300
250
300
250
0.3
86
86
97
97
97
10
4
2
4
Unit
kHz
kHz
mΩ
mΩ
mA
mV
μA
μA
μA
μA
μA
%
%
%
%
%
%
%
%
V
V
V
V
V
V
A
A
A
9