RT8289 Datasheet, PDF (1/13 Pages) Richtek Technology Corporation – 5A, 32V, 500kHz Step-Down Converter

RT8289
5A, 32V, 500kHz Step-Down Converter
General Description
The RT8289 is a step-down regulator with an internal Power
MOSFET. It achieves 5A of continuous output current over
a wide input supply range with excellent load and line
regulation. Current mode operation provides fast transient
response and eases loop stabilization.
The RT8289 prorides protections such as cycle-by-cycle
current limiting and thermal shutdown. In shutdown mode,
the regulator draws 25A of supply current.
The RT8289 requires a minimum number of external
components, to proride a compact solution.
The RT8289 is available in a SOP-8 (Exposed Pad)
package.
Ordering Information
RT8289
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Note :
Lead Plating System
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.
Features
z High Output Current up to 5A
z Internal Soft-Start
z 100mΩ Internal Power MOSFET Switch
z Internal Compensation Minimizes External Parts
Count
z High Efficiency up to 90%
z 25μA Shutdown Current
z Fixed 500kHz Frequency
z Thermal Shutdown Protection
z Cycle-by-Cycle Over Current Protection
z Wide 5.5V to 32V Operating Input Range
z Adjustable Output Voltage from 1.222V to 26V
z Available in an SOP-8 (Exposed Pad) Package
z RoHS Compliant and Halogen Free
Applications
z Distributive Power Systems
z LCD TV
z DSL Modems
z Pre-regulator for Linear Regulators
z Battery Charger
Pin Configurations
(TOP VIEW)
BOOT
NC
NC
FB
8
2
7
GND
3
6
9
4
5
SW
VIN
GND
EN
Typical Application Circuit
SOP-8 (Exposed Pad)
V_IN
5.5V to 32V
Chip Enable
Open
= Automatic Startup
C_IN
4.7µF x 2
7 _VIN
BOOT ¹
5 _EN
RT8289
SW ⁸
6, Exposed Pad (9)
GND
FB ⁴
C_BOOT L
10nF ^10µH
D
B550C
R1
10k
R2
3.16k
V_OUT
5V/5A
C_OUT
47µFx2
(POSCAP)
DS8289-01 March 2011
www.richtek.com
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