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PDF RT9917 Data sheet ( Hoja de datos )
| Número de pieza | RT9917 | |
| Descripción | 7 Channel DC/DC Converters | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9917 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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RT9917
7 Channel DC/DC Converters
General Description
The RT9917 is a complete power-supply solution for digital
still cameras and other hand-held devices.
It integrates :
CH1 : Boost DC-DC converter with load disconnect
controller (SW1).
CH2 : Selectable Boost/Buck DC-DC converter
CH3 : Step-down DC-DC converter with internal
compensation.
CH4 : Step-down DC-DC converter with internal
compensation.
CH5 : DC/DC converter with HV NMOS, internal
compensation and load disconnect (SW5) for CCD positive
supply.
CH6 : DC/DC converter with HV PMOS for CCD negative
supply.
Features
z 1 Channel Boost/Buck Selectable by SEL Pin
z 2 Selectable On/Off Sequence Set by SEQ Pin
z 4 Channels with Internal Compensation
z Provide Charge Pump Voltage to Enhance NMOS
Gate Driving Capability for Alkaline Battery Input
z All Power Switches Integrated
z Syn Step-Down DC/DC Converter
` Up to 95% Efficiency
` 100% (MAX) Duty Cycle
z Syn Step-Up DC/DC Converter
` Adjustable Output Voltage
` Up to 95% Efficiency
z Open LED Protection
z Transformerless Inverting Converter for CCD
z Fixed 1MHz Switching Frequency
z Compact 40-Lead WQFN Package
z RoHS Compliant and 100% Lead (Pb)-Free
CH7 : WLED driver with HV NMOS, internal compensation
and allow for PWM dimming.
SW1 : Load disconnect controller for CH1.
SW5 : Load disconnect switch for CH5.
Applications
Digital Still Camerahttp://www.DataSheet4U.net/
z
z PDA
z Portable Device
Ordering Information
RT9917
Pin Configurations
(TOP VIEW)
Note :
Package Type
QW : WQFN-40L 5x5 (W-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
40 39 38 37 36 35 34 33 32 31
PVDD1 1
30 PVDD2
LX6 2
29 VDDM
PVDD6 3
28 CFB7
CP 4
27 GND
CN 5
CPO 6
GND
26 LX7
25 LX5
FB6 7
FB4 8
COMP6 9
24 VOUT7
41
23 FB3
22 EN7
LX4 10
21 LX3
11 12 13 14 15 16 17 18 19 20
DS9917-03 April 2011
WQFN-40L 5x5
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Channel
Formula
VOUT (V)
L(uH)
R3(kΩ)
R4(kΩ)
C4(pF)
COUT (uF)
Channel
Formula
VOUT (V)
L(uH)
R5(kΩ)
R6(kΩ)
C6(pF)
COUT (uF)
Channel
Formula
VOUT (V)
L(uH)
R7(kΩ)
R8(kΩ)
C9(pF)
COUT (uF)
Channel
Formula
VOUT (V)
L(uH)
R10(kΩ)
R11(kΩ)
COUT (uF)
R12(kΩ)
C11(pF)
C14(pF)
CH3
VOUT = (1+R3/R4) x 0.8
2.5 1.8 1.3 1.2
1.0
4.7 4.7 4.7 4.7 4.7
768 470 237 187 23.2
360 374 374 374 93.1
22 33 68 82
47
10 10 10 10
10
CH4
VOUT = (1+R5/R6) x 0.8
2.5 1.8 1.3 1.2
1.0
4.7 4.7 4.7 4.7
4.7
768 470 237 187 23.2
360 374 374 374 93.1
22 33 68 82
47
10 10 10 10
10
CH5
VOUT = (1+R7/R8) x 1.25
12
13
15 15.5
16
10 10 10 10
10
820
95.3
820
86.6
1000
90.9
820
http://www.DataSheet4U.net/
71.5
886
75
1000
1000
1000
1000
1000
10/16V
10/16V
10/25V
10/25V
10/25V
CH6
VOUT = (R10/R11)*(-1.25)
-6 -6.3 -7
* R10+R11 <90k
-7.5 -8
10 10 10 10
10
57.6 69.8 63.4
68
68
12
13.7 11.3 11.3
10.5
10/16V
10/16V
4.7/16V
4.7/16V
4.7/16V
47 47 75 75
75
47 47 47 47
47
1000
1000
1000
1000
1000
RT9917
DS9917-03 April 2011
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Typical Operating Characteristics
CH1 Boost Efficiency vs. Output Current
100
90
80
70 VIN = 4.5V
60
VIN = 4.2V
VIN = 3.3V
50 VIN = 2.5V
40
VIN = 2.0V
VIN = 1.8V
30
20
10
0
10
VOUT = 5V, L = 2.2μH, COUT = 10μFx2
100
Output Current (mA)
1000
RT9917
CH2 Boost Efficiency vs. Output Current
100
90
80 VIN = 3.0V
70
VIN = 2.7V
VIN = 2.5V
60 VIN = 2.2V
50
VIN = 2.0V
VIN = 1.8V
40
30
20
10
0
10
VOUT = 3.3V, L = 2.2μH, COUT = 10μFx2
100
Output Current (mA)
1000
CH3 Buck Efficiency vs. Output Current
100
90
80
70
60 VIN = 3.0V
50 VIN = 3.3V
40
VIN = 3.6V
VIN = 3.9V
30 VIN = 4.2V
20 VIN = 4.5V
10
0
10
VOUT = 2.5V, L = 4.7μH, COUT = 10μF
100
Output Current (mA)
1000
http://www.DataSheet4U.net/
CH5 Boost Efficiency vs. Output Current
100
90
80
70
VIN = 4.5V
VIN = 4.2V
60 VIN = 3.3V
50
VIN = 2.5V
VIN = 2.0V
40 VIN = 1.8V
30
20
10
0
1
VOUT = 15V, L = 10μH, COUT = 10μF
10
Output Current (mA)
100
CH4 Buck Efficiency vs. Output Current
100
90
80
70
60 VIN = 2.0V
50 VIN = 2.5V
40
VIN = 3.0V
VIN = 3.3V
30 VIN = 4.2V
20 VIN = 4.5V
10
0
10
VOUT = 1.8V, L = 4.7μH, COUT = 10μF
100
Output Current (mA)
1000
CH6 Inverting Efficiency vs. Output Current
100
90
80
70
60
50
40
30
20
10
0
1
VIN = 4.5V
VIN = 4.2V
VIN = 1.8V
VIN = 2.0V
VIN = 3.3V
VIN = 2.5V
VOUT = −8V, L = 10μH, COUT = 10μF
10
Output Current (mA)
100
DS9917-03 April 2011
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet RT9917.PDF ] | |
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