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PDF RT9953 Data sheet ( Hoja de datos )
| Número de pieza | RT9953 | |
| Descripción | 41 CH Power Management IC | |
| Fabricantes | Richtek Technology Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9953 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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RT9953
4+1 CH Power Management IC
General Description
The RT9953 is a complete power supply solution for digital
still cameras and other handheld devices. The RT9953 is
a multi-CH power management IC including one
synchronous step-up DC/DC converter, one selectable
synchronous step-up/step-down DC/DC converter, two
synchronous step-down DC/DC converters, and one low
dropout linear regulator.
The RT9953 is designed to fulfill the applications for DSC
as follows :
CH1 is a synchronous step-up output for motor or DSC
system I/O power
CH2 is a selectable synchronous step-up/step-down
output for motor or DSC system I/O power
CH3 and CH4 are synchronous step-down outputs for DSP
core and memory power supply
CH5 is a 500mA, low dropout, low noise linear regulator
with soft-start function.
The RT9953 is designed to support Li+ and 2AA battery
applications. The selectable step-up/step-down converter
can be set by SEL pin. For the synchronous step-up and
step down converters, the efficiency can be up to 95%.
The RT9953 provides over current protection, thermal
shutdown protection, over voltage and under voltage
protection to achieve complete protection. The RT9953 is
available in the WQFN-24L 4x4 package.
Ordering Information
RT9953
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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.
Features
z One Synchronous Step-Up/Step-Down Selectable
Converter
z Support 2AA or Li-ion Battery Applications
z Internal Soft-Start Control
z 4 CHs with Internal Compensation
z Power Switches Integrated
z Up to 95% Efficiency
z 100% (max) Duty Cycle for Step-Down Converter
z Adjustable Output Voltage
z Fixed 1MHz Switching Frequency
z LDO Works with Low-ESR Ceramic Capacitors
z Fast Line/Load Transient Response
z High PSRR Linear Regulator
z RoHS Compliant and Halogen Free
Applications
z CMOS Digital Still Camera
z CMOS DV
z Portable Devices
http://www.DataSheet4U.net/
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
LX1 1
PVDD1 2
18 LX2
17 PVDD2
EN3 3
FB4 4
GND
16 VDDM
15 FB3
SS 5
PVDD4 6
14 EN2
25 13 PVDD3
7 8 9 10 11 12
WQFN-24L 4x4
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
DS9953-02 April 2011
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
RT9953
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 LX1 Switch Node of CH1. High impedance in shutdown mode.
2 PVDD1 Power Input of CH1.
3 EN3 Enable Control Input of CH3.
4 FB4 Feedback Input of CH4. High impedance in shutdown mode.
5 SS Soft-Start Control Input.
6 PVDD4 Power Input of CH4.
7 LX4 Switch Node of CH7. High impedance in shutdown mode.
8 EN5 Enable Control Input of CH5.
9 VOUT5 Output Voltage of CH5.
10 FB5 Feedback Input of CH5. High impedance in shutdown mode.
11 PVDD5 Power Input of CH5.
12 LX3 Switch Node of CH3. High impedance in shutdown mode.
13 PVDD3 Power Input of CH3.
14 EN2 Enable Control Input of CH2.
15 FB3 Feedback Input of CH3. High impedance in shutdown mode.
16
VDDM
Analog Power Input.
17 PVDD2 Power Input of CH2.
18 LX2 Switch Node of CH2. High impedance in shutdown mode.
19
SEL
Selection Input for CH2 step-up or step-down operation mode. Logic state can
not be changed during operation.
http://www.DataSheet4U.net/
20 EN4 Enable Control Input of CH4.
21 FB2 Feedback Input of CH2. High impedance in shutdown mode.
22 FB1
23,
25 (Exposed Pad)
GND
24 EN1
Feedback Input of CH1. High impedance in shutdown mode.
Ground Pin. The exposed pad must be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
Enable Control Input of CH1.
DS9953-02 April 2011
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U
5 Page 
RT9953
CH4 Step-Down Efficiency vs. Output Current
100
90
80 VBAT = 3.4V
VBAT = 3.6V
70 VBAT = 3.9V
60 VBAT = 4.2V
VBAT = 4.5V
50
40
30
20
10
0
10
VDDM = 5V, VOUT_CH4 = 3.3V,
L4 = 4.7µH, C11 = 10µF
100
Output Current (mA)
1000
CH4 Step-Down Efficiency vs. Output Current
100
90
80
70
60
VBAT = 1.8V
VBAT = 2.5V
50 VBAT = 3V
VBAT = 3.3V
40 VBAT = 3.6V
30 VBAT = 4.5V
20
10
0
10
VDDM = 3V, VOUT_CH4 = 1.2V,
L4 = 4.7µH, C11 = 10µF
100
Output Current (mA)
1000
CH1 Step-Up Output Voltage vs. Output Current
5.000
4.995
4.990
4.985
4.980
4.975
VBAT = 3V
VBAT = 4.5V
4.970
4.965
4.960
4.955
4.950
0
VDDM = 5V
100 200 300 400 500
Output Current (mA)
600
CH2 Step-Down Output Voltage vs. Output Current
1.210
1.208
1.205
1.203
1.200
http://www.DataSheet4U.net/
1.198
VBAT = 3V
VBAT = 4.5V
1.195
1.193
1.190
0
VDDM = 5V
200 400 600 800
Output Current (mA)
1000
CH2 Step-Up Output Voltage vs. Output Current
3.45
3.40
3.35
3.30
3.25
VBAT = 1.8V
VBAT = 3V
3.20
3.15
0
VDDM = 3V
100 200 300 400 500
Output Current (mA)
600
CH3 Step-Down Output Voltage vs. Output Current
1.85
1.84
1.83
1.82
1.81
1.80
VBAT = 4.5V
VBAT = 3V
VBAT = 2.7V
1.79
1.78
0
VDDM = 5V
100 200 300 400 500
Output Current (mA)
600
DS9953-02 April 2011
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.ne
11 Page | ||
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