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  Richtek Technology Electronic Components Datasheet  

RT2805A Datasheet

500kHz Current Mode Asynchronous Step-Down Converter

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®
RT2805A
5A, 36V, 500kHz Current Mode Asynchronous Step-Down
Converter
General Description
The RT2805A 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 5A. 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 RT2805A requires a
minimum number of readily available external
components, providing a compact solution. The RT2805A
provides protection functions inducing input under voltage
lockout, cycle-by-cycle current limit, short circuit
protection and thermal shutdown protection.
The RT2805A is available in the SOP-8 (Exposed Pad)
package.
Ordering Information
RT2805A
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 5A 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 SOP8 (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
RT2805A
GSPYMDNN
RT2805AGSP : Product Number
YMDNN : Date Code
Simplified Application Circuit
VIN
Chip Enable
VIN BOOT
CIN RT2805A
SW
EN
FB
GND
CBOOT
L1
VOUT
D1 R1 COUT
R2
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS2805A-00 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT2805A Datasheet

500kHz Current Mode Asynchronous Step-Down Converter

No Preview Available !

RT2805A
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.
1
2, 3
4
5
6,
9 (Exposed Pad)
7
8
Pin Name
BOOT
NC
FB
EN
GND
VIN
SW
Pin Function
Bootstrap Input for High Side Gate Driver. Connect a 10nF or greater capacitor
from SW to BOOT to power the high side switch.
No Internal Connection.
Feedback Input. The feedback threshold is 1.222V.
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 it off. For
automatic startup, leave EN unconnected.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Power Input. A suitable large capacitor should be connected from the VIN to
GND to eliminate noise on the input to the IC.
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.
DS2805A-00 November 2012


Part Number RT2805A
Description 500kHz Current Mode Asynchronous Step-Down Converter
Maker Richtek
Total Page 15 Pages
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