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  Richtek Technology Electronic Components Datasheet  

RT7247B Datasheet

Synchronous Step-Down Converter

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®
RT7247B
2A, 18V, 1.2MHz Synchronous Step-Down Converter
General Description
The RT7247B is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 2A
output current from a 4.5V to 18V input supply. The
RT7247B's current mode architecture and external
compensation allow the transient response to be
optimized over a wide input range and loads. Cycle-by-
cycle current limit provides protection against shorted
outputs, and soft-start eliminates input current surge during
start-up. The RT7247B also provides under voltage
protection and thermal shutdown protection. The low
current (<3μA) shutdown mode provides output
disconnection, enabling easy power management in
battery-powered systems. The RT7247B is available in
an SOP-8 (Exposed Pad) package.
Marking Information
RT7247BxGSP : Product Number
RT7247Bx
GSPYMDNN
x : H or L
YMDNN : Date Code
Features
±1.5% High Accuracy Reference Voltage
4.5V to 18V Input Voltage Range
2A Output Current
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 1.2MHz
Output Adjustable from 0.8V to 12V
Stable with Low ESR Ceramic Output Capacitors
Up to 95% Efficiency
Programmable Soft-Start
Cycle-by-Cycle Over Current Limit
Input Under Voltage Lockout
Output Under Voltage Protection
Thermal Shutdown Protection
RoHS Compliant and Halogen Free
Applications
Wireless AP/Router
Set-Top-Box
Industrial and Commercial Low Power Systems
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation of High-Performance DSPs
Simplified Application Circuit
VIN
Chip Enable
VIN BOOT
CIN RT7247B
SW
EN
SS
CSS
GND
FB
COMP
CBOOT
L
CC RC
VOUT
R1
COUT
R2
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS7247B-01 September 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/


  Richtek Technology Electronic Components Datasheet  

RT7247B Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT7247B
Ordering Information
RT7247B
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
H : UVP Hiccup
L : UVP Latch-Off
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.
Pin Configurations
(TOP VIEW)
BOOT
VIN
SW
GND
8
27
GND
36
9
45
SS
EN
COMP
FB
SOP-8 (Exposed Pad)
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
BOOT
Bootstrap for High Side Gate Driver. Connect a 0.1μF or greater ceramic
capacitor from BOOT to SW pins.
2
VIN
Input Supply Voltage, 4.5V to 18V. Must bypass with a suitable large ceramic
capacitor.
3 SW Switch Node. Connect this pin to an external L-C filter.
4,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
5
FB
Feedback Input. It is used to regulate the output of the converter to a set value
via an external resistive voltage divider.
Compensation Node. COMP is used to compensate the regulation control
6
COMP
loop. Connect a series RC network from COMP to GND. In some cases, an
additional capacitor from COMP to GND is required.
Enable Input. A logic high enables the converter; a logic low forces the IC into
7 EN shutdown mode reducing the supply current to less than 3μA. Attach this pin
to VIN with a 100kΩ pull-up resistor for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor
8 SS from SS to GND to set the soft-start period. A 0.1μF capacitor sets the
soft-start period to 13.5ms.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7247B-01 September 2012
Free Datasheet http://www.datasheet4u.com/


Part Number RT7247B
Description Synchronous Step-Down Converter
Maker Richtek
Total Page 15 Pages
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