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RT9971 Datasheet(PDF) 3 Page - Richtek Technology Corporation

Part # RT9971
Description  7 CH Power Management IC
PDF  22 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9971 Datasheet(HTML) 3 Page - Richtek Technology Corporation

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DS9971-01 April 2011
www.richtek.com
RT9971
Note :
(1) SEL = High, CH2 is Step -Up, CN Connect to CAP
(2) VBAT = 1.8V to 3.2V
For 2AA
Typical Application Circuit
PVDD1
FB2
OK
FB1
LX2
PVDD2
SW5O
SW5I
LX5
36
31
20
30
15
25
RT9971
10
µF/25V
VBAT
FB5
PVDD3
13
14
C14
L5
10
µH
VOUT1
COMP1
COMP2
3V3
LX3
21
L3
4.7
µH
10
µF
C10
2.5V
FB3
23
11
PVDD4
LX4
10
L4
4.7
µH
10
µF
C13
1.8V
FB4
8
1nF
C15
L6
10
µH
63.4k
11.3k
10
µF/16V x 2
0.1
µF
2
LX6
7
FB6
16
VREF
18
RTC_R
10k
4
CP
5
CN
33
38
34
35
37
C9
C12
C18
C19
R7
R8
R9
R10
R11
R12
R13
R14
R16
10
µF/25V
C16
1000k
90.9k
39k
R6
560pF
C7
10uF
C8
768k
360k
22pF
3V3
10uF
C11
470k
374k
33pF
26
24
28
VBAT
LX7
VOUT7
CFB7
1
µF/16V
C20
10
R15
L7
D1
D2
10
µH
PVDD6 3
VBAT
LX1
1
40
VDDM
VBAT
L1
2.2
µH
29
15V
1nF
WLED
3V3
RTC Reset
19
RTC_PWR
RTC 3.25V
0.1
µF
C28
PNEG
6
1
µF
C29
3.3V
50k
C1
R19
Q1
10
µF
4.7pF
C2
470k
R1
150k
R2
39k
R3
560pF
C3
VOUT_SW1
10
µFx2
5V
C5
470k
R4
88.7k
R5
VBAT
L2 2.2
µH
15V
-7V
10
µF
C22
10
µF x 2
C27
10
µF
C4
1
µF
C23
1
µF
C24
D3
D4
D5
C17
1
µF
C26
1
µF
C25
VOUT_CH2
VOUT_CH3
VOUT_CH4
VOUT_CH5
VOUT_CH6
3V3
4.7pF
C6
27, Exposed Pad (41)
GND
17 SEL
EN5
EN6
OFF
ON
12
9
32
EN134
EN7
22
39 EN2
VOUT_CH1
VBAT
VDDM
EN2, EN134
VOUT_CH1 3.3V
VOUT_CH3 2.5V
VOUT_CH4 1.8V
VOUT_SW1 3.3V
Wait until FB4 < 0.1V
Wait until VOUT1 < 0.4V
Wait until FB3 < 0.1V
IC shutdown
VOUT_CH2 5V
Depends on loading
User define
3.5ms
3.5ms
3.5ms
3.5ms
3.5ms
Timing Diagram
→
→
→
→
→
→
Power On Sequence : CH1 Step -Up 3.3V
CH3 Step -Down 2.5V
CH4 Step -Down 1.8V
(CH2 Step -Up 5V and
SW1 3.3V)
Power Off Sequence : (CH2 Step -Up 5V and SW1 3.3V)
CH4 Step -Down 1.8V
CH3 Step -Down 2.5V
CH1
Step -Up 3.3V



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