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  Richtek Technology Electronic Components Datasheet  

RT8280 Datasheet

3MHz Step-Down Converter

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RT8280 pdf
®
RT8280
3A, 24V, 3MHz Step-Down Converter
General Description
The RT8280 is a high voltage buck converter that can
support an input voltage range from 4.5V to 24V with output
current up to 3A. Current mode operation provides fast
transient response and eases loop stabilization.
The chip provides protection functions such as cycle-by-
cycle current limiting and thermal shutdown protection.
In shutdown mode, the regulator only draws 25μA of
supply current. The RT8280 is available in a SOP-8
(Exposed Pad) package.
Ordering Information
RT8280
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
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.
Marking Information
RT8280GSP : Product Number
RT8280
YMDNN : Date Code
GSPYMDNN
Features
Wide Operating Input Range : 4.5V to 24V
Adjustable Output Voltage Range : 0.8V to 15V
Output Current up to 3A
25μA Low Shutdown Current
High Efficiency up to 90% at 2.2MHz
Programmable Frequency : 220kHz to 3MHz
Internal Soft-Start
Stable with Low ESR Output Ceramic Capacitors
Thermal Shutdown Protection
Cycle-By-Cycle Over Current Protection
RoHS Compliant and Halogen Free
Applications
DSL Modem for ADSL2+ Standard
Distributed Power Systems
Pre-Regulator for Linear Regulators
Pin Configurations
http://www.DataSheet4U.net/
(TOP VIEW)
BOOT
VIN
SW
GND
8
27
GND
36
9
45
RT
EN
COMP
FB
SOP-8 (Exposed Pad)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8280-02 March 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/


  Richtek Technology Electronic Components Datasheet  

RT8280 Datasheet

3MHz Step-Down Converter

No Preview Available !

RT8280 pdf
RT8280
Typical Application Circuit
VIN
4.5V to 24V
Chip Enable
CIN
10µF
2 VIN
BOOT 1
7 EN
RT8280
SW 3
8 RT
RRT
24k
4,
9 (Exposed Pad) GND
FB 5
COMP 6
CBOOT L
10nF 2.2µH
B330A
R1
31.6k
VOUT
3.3V/3A
COUT
22µF
1C.8CnF 2R4Ck
R2
10k
VOUT (V)
10
8
5
3.3
2.5
1.8
1.5
1.2
NCCP
Table 1. Recommended Component Selection for fSW = 2.2MHz
R1 (kΩ)
115
R2 (kΩ)
10
RC (kΩ)
68
CC (nF)
0.82
L (μH)
8.2
91 10 51
1 6.8
5 2.3
10
36 1.2 4.7
3 1.6
10
24 1.8 2.2
2 1.5
10
18 2.2
2
1 2.4
10
13 2.2 1.5
8 .87
10
12 2.2 1.5
4 .99
10
9
1.8 1
COUT (μF)
22
22
22
22
22
22
22
22
Functional Pin Description
Pin No.
1
2
Pin Name
BOOT
VIN
http://www.DataSheet4U.net/
Pin Function
Bootstrap Power. BOOT supplies the drive for the high side N-MOSFET switch.
Connect a 10nF or greater capacitor from SW to BOOT to power the high side
switch.
Supply Input. VIN supplies the power to the IC, as well as the step-down
converter switches. Drive VIN with a 4.5V to 24V power source. Bypass VIN to
GND with a suitably large capacitor to eliminate noise on the input to the IC.
3 SW
4,
9 (Exposed Pad)
GND
5 FB
6 COMP
7 EN
8 RT
Switch Node. SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load. Note that a capacitor is
required from SW to BOOT to power the high side switch.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Feedback Input. FB senses the output voltage to regulate. Drive FB with a
resistive voltage divider from the output voltage.
Compensation Node. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation
control loop. In some cases, an additional capacitor from COMP to GND is
required.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN
higher than 1.4V to turn on the regulator, lower than 0.4V to turn off. For
automatic startup, leave EN unconnected.
Oscillator Resistor Input. Connecting a resistor to ground from this pin sets the
switching frequency.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8280-02 March 2012
datasheet pdf - http://www.DataSheet4U.net/


Part Number RT8280
Description 3MHz Step-Down Converter
Maker Richtek
Total Page 16 Pages
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