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  Richtek Technology Electronic Components Datasheet  

RT2808A Datasheet

500kHz Current Mode Asynchronous Step-Down Converter

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®
RT2808A
3A, 36V, 500kHz Current Mode Asynchronous Step-Down
Converter
General Description
The RT2808A is a current mode asynchronous step-down
converter that achieves excellent load and line regulation.
Over a wide input voltage range from 5.5V to 36V and
supports output current up to 3A. The Current mode
operation provides fast transient response and eases loop
stabilization.
An adjustable soft-start reduces the stress on the input
source at startup. In shutdown mode, the regulator draws
only 25μA of supply current. The RT2808A requires a
minimum number of readily available external
components, providing a compact solution. The RT2808A
provides protection functions inducing input under voltage
lockout, cycle-by-cycle current limit, short circuit
protection and thermal shutdown protection.
The RT2808A is available in the SOP-8 (Exposed Pad)
package.
Ordering Information
RT2808A
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
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 3A Output Current
z Wide Operating Input Range 5.5V to 36V
z Adjustable Output Voltage from 1.222V to 26V
z High Efficiency up to 90%
z Internal Compensation Minimizes External Parts
Count
z Internal Soft-Start
z 110mΩ Internal Power MOSFET Switch
z 25μA Shutdown Mode
z Fixed 500kHz Frequency
z Thermal Shutdown
z Cycle-by-Cycle Current Limit
z Available In an SOP-8 (Exposed Pad) Package
z RoHS Compliant and Halogen Free
Applications
z Distributive Power Systems
z Battery Charger
z DSL Modems
z Pre-regulator for Linear Regulators
Marking Information
RT2808A
GSPYMDNN
RT2808AGSP : Product Number
YMDNN : Date Code
Simplified Application Circuit
VIN
Chip Enable
VIN BOOT
CIN RT2808A
SW
EN
FB
GND
CBOOT
L
D1
VOUT
R1 COUT
R2
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS2808A-00 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT2808A Datasheet

500kHz Current Mode Asynchronous Step-Down Converter

No Preview Available !

RT2808A
Pin Configurations
(TOP VIEW)
BOOT
NC
NC
FB
8
27
GND
36
9
45
SW
VIN
GND
EN
SOP-8 (Exposed Pad)
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
BOOT
Bootstrap Input for High Side Gate Driver. Connect a 10nF or greater capacitor
from SW to BOOT to power the high side switch.
2, 3 NC
No Internal Connection.
4 FB
Feedback Input. The feedback threshold is 1.222V.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN
5 EN higher than 1.4V to turn on the regulator, lower than 0.4V to turn it off. For
automatic startup, leave EN unconnected.
6,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
7
VIN
Power Input. A suitable large capacitor should be connected from the VIN to
GND to eliminate noise on the input to the IC.
8
SW
Switch Node. Note that a capacitor is required from SW to BOOT to power the
high side switch.
Function Block Diagram
VIN
Current Sense
Ramp
Amplifier -
Generator
+
EN
Regulator
Oscillator
500kHz
S
Q
Driver
Reference
Error
+ Amplifier
+
R
-
Current
Comparator
FB -
12k
400k 30pF
Bootstrap
Control
13pF
BOOT
SW
GND
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2808A-00 November 2012


Part Number RT2808A
Description 500kHz Current Mode Asynchronous Step-Down Converter
Maker Richtek
Total Page 15 Pages
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