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PDF RT8800B Data sheet ( Hoja de datos )
| Número de pieza | RT8800B | |
| Descripción | General Purpose 2/3-Phase PWM Controller | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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RT8800/B
General Purpose 2/3-Phase PWM Controller for High-Density
Power Supply
General Description
Features
The RT8800/B are general purpose multi-phase
synchronous buck controllers dedicating for high density
power supply regulation. The parts implement 2, and 3
buck switching stages operating in interleaved phase set
automatically. The output voltage is regulated and
controlled following the input voltage of FB pin. With such
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a single analog control, the RT8800/B provide a simple,
flexible, wide-range and extreme cost-effective high-
density voltage regulation solutions for various high-density
power supply application. The RT8800/B multi-phase
architecture provide high output current while maintaining
low power dissipation on power devices and low stress
on input and output capacitors. The high equivalent
operating frequency also reduces the component
dimension and the output voltage ripple in load transient.
RT8800/B implement both voltage and current loops to
achieve good regulation, response and power stage
thermal balance. The RT8800/B apply the time sharing
DCR current sensing technology newly as well; with such
a topology, the RT8800/B extract the DCR of output
inductor as sense component to deliver a more precise
load line regulation and better thermal balance capability.
Moreover, the parts monitor the output voltage for over-
current and over-voltage protection; Soft-start and
programmable under-voltage lockout are also provided to
assure the safety of power system.
Applications
Desktop CPU core power
Low Output Voltage, High power density DC-DC
Converters
Voltage Regulator Modules
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
5V Power Supply Voltage
2/3-Phase Power Conversion with Automatic Phase
Selection (RT8800 : 2/3-Phase, RT8800B : 2-Phase)
Output Voltage Controlled by External Reference
Voltage
Precise Core Voltage Regulation
Power Stage Thermal Balance by DCR Current
Sensing
Extreme Low-Cost, Lossless Time Sharing Current
Sensing
Internal Soft-start
Hiccup Mode Over-Current Protection
Over-Voltage Protection
Adjustable Operating Frequency and Typical at
300kHz Per Phase
Power Good indication
Small 16-Lead VQFN Package (For RT8800 only)
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT8800/B
Package Type
QV : VQFN-16L 3x3 (V-Type)
S : SOP-16
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
2-Phase
2/3-Phase
Note :
RichTek Pb-free and Green 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.
`100% matte tin (Sn) plating.
All brand name or trademark belong to their owner respectively
DS8800/B-06 March 2007
www.richtek.com
1
1 page  
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RT8800/B
13 PWM1
16 VDD
3
FB
5
COMP
ISP1 12
ICOMMON 8
RT 7
DVD 4
DS8800/B-06 March 2007
Figure C. 3-phase with RT9401A/B DAC generator
All brand name or trademark belong to their owner respectively
www.richtek.com
5
5 Page 
Typical Operating Characteristics
1.4
1.38
Load Line
RLL = 1.5mΩ, RICOMMON2 = 10kΩ, RDROOP = 100Ω
VIN = 12V
1.36
1.34
1.32
1.3
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1.28
1.26
1.24
0
10 20
30 40 50 60 70
Output Current (A)
80 90 100
RT8800/B
100
90
80
70
60
50
40
30
20
10
0
0
Efficiency vs. Output Current
VIN = 12V, VOUT = 1.4V
Driver RT9605
10 20 30 40 50 60 70 80 90 100
Output Current (A)
1000
900
800
700
600
500
400
300
200
100
0
0
Frequency vs. RRT
5 10 15 20 25 30 35 40 45 50 55 60
RRT (kٛΩ))
GM
90 RICOMMON1 = 430Ω
80
70
60
50
GM3
GM2
40 GM1
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100 110
VC (mV)
0.815
VREF vs. Temperature
OCP Trip Point vs. Temperature
240
0.81
0.805
0.8
0.795
0.79
0.785
210
180
150
120
90
60
30
0.78
-25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
0
-25 -10 5 20 35 50 65 80 95
Temperature (°C)
All brand name or trademark belong to their owner respectively
DS8800/B-06 March 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet RT8800B.PDF ] | |
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